Dissolve gerrit-server top-level directory

Change-Id: I538512dfe0f1bea774c01fdd45fa410a45634011

java/com/google/gerrit/server/extensions/events/AbstractChangeEvent.java

@@ -0,0 +1,56 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.events.ChangeEvent;
+import java.sql.Timestamp;
+
+public abstract class AbstractChangeEvent implements ChangeEvent {
+  private final ChangeInfo changeInfo;
+  private final AccountInfo who;
+  private final Timestamp when;
+  private final NotifyHandling notify;
+
+  protected AbstractChangeEvent(
+      ChangeInfo change, AccountInfo who, Timestamp when, NotifyHandling notify) {
+    this.changeInfo = change;
+    this.who = who;
+    this.when = when;
+    this.notify = notify;
+  }
+
+  @Override
+  public ChangeInfo getChange() {
+    return changeInfo;
+  }
+
+  @Override
+  public AccountInfo getWho() {
+    return who;
+  }
+
+  @Override
+  public Timestamp getWhen() {
+    return when;
+  }
+
+  @Override
+  public NotifyHandling getNotify() {
+    return notify;
+  }
+}

java/com/google/gerrit/server/extensions/events/AbstractNoNotifyEvent.java

@@ -0,0 +1,26 @@
+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.events.GerritEvent;
+
+/** Intermediate class for events that do not support notification type. */
+public abstract class AbstractNoNotifyEvent implements GerritEvent {
+  @Override
+  public NotifyHandling getNotify() {
+    return NotifyHandling.NONE;
+  }
+}

java/com/google/gerrit/server/extensions/events/AbstractRevisionEvent.java

@@ -0,0 +1,42 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.common.RevisionInfo;
+import com.google.gerrit.extensions.events.RevisionEvent;
+import java.sql.Timestamp;
+
+public abstract class AbstractRevisionEvent extends AbstractChangeEvent implements RevisionEvent {
+
+  private final RevisionInfo revisionInfo;
+
+  protected AbstractRevisionEvent(
+      ChangeInfo change,
+      RevisionInfo revision,
+      AccountInfo who,
+      Timestamp when,
+      NotifyHandling notify) {
+    super(change, who, when, notify);
+    revisionInfo = revision;
+  }
+
+  @Override
+  public RevisionInfo getRevision() {
+    return revisionInfo;
+  }
+}

java/com/google/gerrit/server/extensions/events/AgreementSignup.java

@@ -0,0 +1,67 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.events.AgreementSignupListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.inject.Inject;
+
+public class AgreementSignup {
+  private final DynamicSet<AgreementSignupListener> listeners;
+  private final EventUtil util;
+
+  @Inject
+  AgreementSignup(DynamicSet<AgreementSignupListener> listeners, EventUtil util) {
+    this.listeners = listeners;
+    this.util = util;
+  }
+
+  public void fire(Account account, String agreementName) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    Event event = new Event(util.accountInfo(account), agreementName);
+    for (AgreementSignupListener l : listeners) {
+      try {
+        l.onAgreementSignup(event);
+      } catch (Exception e) {
+        util.logEventListenerError(this, l, e);
+      }
+    }
+  }
+
+  private static class Event extends AbstractNoNotifyEvent
+      implements AgreementSignupListener.Event {
+    private final AccountInfo account;
+    private final String agreementName;
+
+    Event(AccountInfo account, String agreementName) {
+      this.account = account;
+      this.agreementName = agreementName;
+    }
+
+    @Override
+    public AccountInfo getAccount() {
+      return account;
+    }
+
+    @Override
+    public String getAgreementName() {
+      return agreementName;
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/AssigneeChanged.java

@@ -0,0 +1,78 @@
+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.events.AssigneeChangedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import java.sql.Timestamp;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class AssigneeChanged {
+  private static final Logger log = LoggerFactory.getLogger(AssigneeChanged.class);
+
+  private final DynamicSet<AssigneeChangedListener> listeners;
+  private final EventUtil util;
+
+  @Inject
+  AssigneeChanged(DynamicSet<AssigneeChangedListener> listeners, EventUtil util) {
+    this.listeners = listeners;
+    this.util = util;
+  }
+
+  public void fire(Change change, Account account, Account oldAssignee, Timestamp when) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    try {
+      Event event =
+          new Event(
+              util.changeInfo(change),
+              util.accountInfo(account),
+              util.accountInfo(oldAssignee),
+              when);
+      for (AssigneeChangedListener l : listeners) {
+        try {
+          l.onAssigneeChanged(event);
+        } catch (Exception e) {
+          util.logEventListenerError(event, l, e);
+        }
+      }
+    } catch (OrmException e) {
+      log.error("Couldn't fire event", e);
+    }
+  }
+
+  private static class Event extends AbstractChangeEvent implements AssigneeChangedListener.Event {
+    private final AccountInfo oldAssignee;
+
+    Event(ChangeInfo change, AccountInfo editor, AccountInfo oldAssignee, Timestamp when) {
+      super(change, editor, when, NotifyHandling.ALL);
+      this.oldAssignee = oldAssignee;
+    }
+
+    @Override
+    public AccountInfo getOldAssignee() {
+      return oldAssignee;
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/ChangeAbandoned.java

@@ -0,0 +1,106 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.common.RevisionInfo;
+import com.google.gerrit.extensions.events.ChangeAbandonedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.PatchSet;
+import com.google.gerrit.server.GpgException;
+import com.google.gerrit.server.patch.PatchListNotAvailableException;
+import com.google.gerrit.server.patch.PatchListObjectTooLargeException;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import java.io.IOException;
+import java.sql.Timestamp;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ChangeAbandoned {
+  private static final Logger log = LoggerFactory.getLogger(ChangeAbandoned.class);
+
+  private final DynamicSet<ChangeAbandonedListener> listeners;
+  private final EventUtil util;
+
+  @Inject
+  ChangeAbandoned(DynamicSet<ChangeAbandonedListener> listeners, EventUtil util) {
+    this.listeners = listeners;
+    this.util = util;
+  }
+
+  public void fire(
+      Change change,
+      PatchSet ps,
+      Account abandoner,
+      String reason,
+      Timestamp when,
+      NotifyHandling notifyHandling) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    try {
+      Event event =
+          new Event(
+              util.changeInfo(change),
+              util.revisionInfo(change.getProject(), ps),
+              util.accountInfo(abandoner),
+              reason,
+              when,
+              notifyHandling);
+      for (ChangeAbandonedListener l : listeners) {
+        try {
+          l.onChangeAbandoned(event);
+        } catch (Exception e) {
+          util.logEventListenerError(this, l, e);
+        }
+      }
+    } catch (PatchListObjectTooLargeException e) {
+      log.warn("Couldn't fire event: " + e.getMessage());
+    } catch (PatchListNotAvailableException
+        | GpgException
+        | IOException
+        | OrmException
+        | PermissionBackendException e) {
+      log.error("Couldn't fire event", e);
+    }
+  }
+
+  private static class Event extends AbstractRevisionEvent
+      implements ChangeAbandonedListener.Event {
+    private final String reason;
+
+    Event(
+        ChangeInfo change,
+        RevisionInfo revision,
+        AccountInfo abandoner,
+        String reason,
+        Timestamp when,
+        NotifyHandling notifyHandling) {
+      super(change, revision, abandoner, when, notifyHandling);
+      this.reason = reason;
+    }
+
+    @Override
+    public String getReason() {
+      return reason;
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/ChangeMerged.java

@@ -0,0 +1,98 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.common.RevisionInfo;
+import com.google.gerrit.extensions.events.ChangeMergedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.PatchSet;
+import com.google.gerrit.server.GpgException;
+import com.google.gerrit.server.patch.PatchListNotAvailableException;
+import com.google.gerrit.server.patch.PatchListObjectTooLargeException;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import java.io.IOException;
+import java.sql.Timestamp;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ChangeMerged {
+  private static final Logger log = LoggerFactory.getLogger(ChangeMerged.class);
+
+  private final DynamicSet<ChangeMergedListener> listeners;
+  private final EventUtil util;
+
+  @Inject
+  ChangeMerged(DynamicSet<ChangeMergedListener> listeners, EventUtil util) {
+    this.listeners = listeners;
+    this.util = util;
+  }
+
+  public void fire(
+      Change change, PatchSet ps, Account merger, String newRevisionId, Timestamp when) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    try {
+      Event event =
+          new Event(
+              util.changeInfo(change),
+              util.revisionInfo(change.getProject(), ps),
+              util.accountInfo(merger),
+              newRevisionId,
+              when);
+      for (ChangeMergedListener l : listeners) {
+        try {
+          l.onChangeMerged(event);
+        } catch (Exception e) {
+          util.logEventListenerError(this, l, e);
+        }
+      }
+    } catch (PatchListObjectTooLargeException e) {
+      log.warn("Couldn't fire event: " + e.getMessage());
+    } catch (PatchListNotAvailableException
+        | GpgException
+        | IOException
+        | OrmException
+        | PermissionBackendException e) {
+      log.error("Couldn't fire event", e);
+    }
+  }
+
+  private static class Event extends AbstractRevisionEvent implements ChangeMergedListener.Event {
+    private final String newRevisionId;
+
+    Event(
+        ChangeInfo change,
+        RevisionInfo revision,
+        AccountInfo merger,
+        String newRevisionId,
+        Timestamp when) {
+      super(change, revision, merger, when, NotifyHandling.ALL);
+      this.newRevisionId = newRevisionId;
+    }
+
+    @Override
+    public String getNewRevisionId() {
+      return newRevisionId;
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/ChangeRestored.java

@@ -0,0 +1,98 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.common.RevisionInfo;
+import com.google.gerrit.extensions.events.ChangeRestoredListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.PatchSet;
+import com.google.gerrit.server.GpgException;
+import com.google.gerrit.server.patch.PatchListNotAvailableException;
+import com.google.gerrit.server.patch.PatchListObjectTooLargeException;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import java.io.IOException;
+import java.sql.Timestamp;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ChangeRestored {
+  private static final Logger log = LoggerFactory.getLogger(ChangeRestored.class);
+
+  private final DynamicSet<ChangeRestoredListener> listeners;
+  private final EventUtil util;
+
+  @Inject
+  ChangeRestored(DynamicSet<ChangeRestoredListener> listeners, EventUtil util) {
+    this.listeners = listeners;
+    this.util = util;
+  }
+
+  public void fire(Change change, PatchSet ps, Account restorer, String reason, Timestamp when) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    try {
+      Event event =
+          new Event(
+              util.changeInfo(change),
+              util.revisionInfo(change.getProject(), ps),
+              util.accountInfo(restorer),
+              reason,
+              when);
+      for (ChangeRestoredListener l : listeners) {
+        try {
+          l.onChangeRestored(event);
+        } catch (Exception e) {
+          util.logEventListenerError(this, l, e);
+        }
+      }
+    } catch (PatchListObjectTooLargeException e) {
+      log.warn("Couldn't fire event: " + e.getMessage());
+    } catch (PatchListNotAvailableException
+        | GpgException
+        | IOException
+        | OrmException
+        | PermissionBackendException e) {
+      log.error("Couldn't fire event", e);
+    }
+  }
+
+  private static class Event extends AbstractRevisionEvent implements ChangeRestoredListener.Event {
+
+    private String reason;
+
+    Event(
+        ChangeInfo change,
+        RevisionInfo revision,
+        AccountInfo restorer,
+        String reason,
+        Timestamp when) {
+      super(change, revision, restorer, when, NotifyHandling.ALL);
+      this.reason = reason;
+    }
+
+    @Override
+    public String getReason() {
+      return reason;
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/ChangeReverted.java

@@ -0,0 +1,71 @@
+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.events.ChangeRevertedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import java.sql.Timestamp;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ChangeReverted {
+  private static final Logger log = LoggerFactory.getLogger(ChangeReverted.class);
+
+  private final DynamicSet<ChangeRevertedListener> listeners;
+  private final EventUtil util;
+
+  @Inject
+  ChangeReverted(DynamicSet<ChangeRevertedListener> listeners, EventUtil util) {
+    this.listeners = listeners;
+    this.util = util;
+  }
+
+  public void fire(Change change, Change revertChange, Timestamp when) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    try {
+      Event event = new Event(util.changeInfo(change), util.changeInfo(revertChange), when);
+      for (ChangeRevertedListener l : listeners) {
+        try {
+          l.onChangeReverted(event);
+        } catch (Exception e) {
+          util.logEventListenerError(this, l, e);
+        }
+      }
+    } catch (OrmException e) {
+      log.error("Couldn't fire event", e);
+    }
+  }
+
+  private static class Event extends AbstractChangeEvent implements ChangeRevertedListener.Event {
+    private final ChangeInfo revertChange;
+
+    Event(ChangeInfo change, ChangeInfo revertChange, Timestamp when) {
+      super(change, revertChange.owner, when, NotifyHandling.ALL);
+      this.revertChange = revertChange;
+    }
+
+    @Override
+    public ChangeInfo getRevertChange() {
+      return revertChange;
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/CommentAdded.java

@@ -0,0 +1,125 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.common.ApprovalInfo;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.common.RevisionInfo;
+import com.google.gerrit.extensions.events.CommentAddedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.PatchSet;
+import com.google.gerrit.server.GpgException;
+import com.google.gerrit.server.patch.PatchListNotAvailableException;
+import com.google.gerrit.server.patch.PatchListObjectTooLargeException;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import java.io.IOException;
+import java.sql.Timestamp;
+import java.util.Map;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class CommentAdded {
+  private static final Logger log = LoggerFactory.getLogger(CommentAdded.class);
+
+  private final DynamicSet<CommentAddedListener> listeners;
+  private final EventUtil util;
+
+  @Inject
+  CommentAdded(DynamicSet<CommentAddedListener> listeners, EventUtil util) {
+    this.listeners = listeners;
+    this.util = util;
+  }
+
+  public void fire(
+      Change change,
+      PatchSet ps,
+      Account author,
+      String comment,
+      Map<String, Short> approvals,
+      Map<String, Short> oldApprovals,
+      Timestamp when) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    try {
+      Event event =
+          new Event(
+              util.changeInfo(change),
+              util.revisionInfo(change.getProject(), ps),
+              util.accountInfo(author),
+              comment,
+              util.approvals(author, approvals, when),
+              util.approvals(author, oldApprovals, when),
+              when);
+      for (CommentAddedListener l : listeners) {
+        try {
+          l.onCommentAdded(event);
+        } catch (Exception e) {
+          util.logEventListenerError(this, l, e);
+        }
+      }
+    } catch (PatchListObjectTooLargeException e) {
+      log.warn("Couldn't fire event: " + e.getMessage());
+    } catch (PatchListNotAvailableException
+        | GpgException
+        | IOException
+        | OrmException
+        | PermissionBackendException e) {
+      log.error("Couldn't fire event", e);
+    }
+  }
+
+  private static class Event extends AbstractRevisionEvent implements CommentAddedListener.Event {
+
+    private final String comment;
+    private final Map<String, ApprovalInfo> approvals;
+    private final Map<String, ApprovalInfo> oldApprovals;
+
+    Event(
+        ChangeInfo change,
+        RevisionInfo revision,
+        AccountInfo author,
+        String comment,
+        Map<String, ApprovalInfo> approvals,
+        Map<String, ApprovalInfo> oldApprovals,
+        Timestamp when) {
+      super(change, revision, author, when, NotifyHandling.ALL);
+      this.comment = comment;
+      this.approvals = approvals;
+      this.oldApprovals = oldApprovals;
+    }
+
+    @Override
+    public String getComment() {
+      return comment;
+    }
+
+    @Override
+    public Map<String, ApprovalInfo> getApprovals() {
+      return approvals;
+    }
+
+    @Override
+    public Map<String, ApprovalInfo> getOldApprovals() {
+      return oldApprovals;
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/EventUtil.java

@@ -0,0 +1,140 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Sets;
+import com.google.gerrit.extensions.client.ListChangesOption;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.common.ApprovalInfo;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.common.RevisionInfo;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.PatchSet;
+import com.google.gerrit.reviewdb.client.Project;
+import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gerrit.server.GpgException;
+import com.google.gerrit.server.change.ChangeJson;
+import com.google.gerrit.server.patch.PatchListNotAvailableException;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gerrit.server.query.change.ChangeData;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import java.io.IOException;
+import java.sql.Timestamp;
+import java.util.EnumSet;
+import java.util.HashMap;
+import java.util.Map;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class EventUtil {
+  private static final Logger log = LoggerFactory.getLogger(EventUtil.class);
+
+  private static final ImmutableSet<ListChangesOption> CHANGE_OPTIONS;
+
+  static {
+    EnumSet<ListChangesOption> opts = EnumSet.allOf(ListChangesOption.class);
+
+    // Some options, like actions, are expensive to compute because they potentially have to walk
+    // lots of history and inspect lots of other changes.
+    opts.remove(ListChangesOption.CHANGE_ACTIONS);
+    opts.remove(ListChangesOption.CURRENT_ACTIONS);
+
+    // CHECK suppresses some exceptions on corrupt changes, which is not appropriate for passing
+    // through the event system as we would rather let them propagate.
+    opts.remove(ListChangesOption.CHECK);
+
+    CHANGE_OPTIONS = Sets.immutableEnumSet(opts);
+  }
+
+  private final ChangeData.Factory changeDataFactory;
+  private final Provider<ReviewDb> db;
+  private final ChangeJson changeJson;
+
+  @Inject
+  EventUtil(
+      ChangeJson.Factory changeJsonFactory,
+      ChangeData.Factory changeDataFactory,
+      Provider<ReviewDb> db) {
+    this.changeDataFactory = changeDataFactory;
+    this.db = db;
+    this.changeJson = changeJsonFactory.create(CHANGE_OPTIONS);
+  }
+
+  public ChangeInfo changeInfo(Change change) throws OrmException {
+    return changeJson.format(change);
+  }
+
+  public RevisionInfo revisionInfo(Project project, PatchSet ps)
+      throws OrmException, PatchListNotAvailableException, GpgException, IOException,
+          PermissionBackendException {
+    return revisionInfo(project.getNameKey(), ps);
+  }
+
+  public RevisionInfo revisionInfo(Project.NameKey project, PatchSet ps)
+      throws OrmException, PatchListNotAvailableException, GpgException, IOException,
+          PermissionBackendException {
+    ChangeData cd = changeDataFactory.create(db.get(), project, ps.getId().getParentKey());
+    return changeJson.getRevisionInfo(cd, ps);
+  }
+
+  public AccountInfo accountInfo(Account a) {
+    if (a == null || a.getId() == null) {
+      return null;
+    }
+    AccountInfo accountInfo = new AccountInfo(a.getId().get());
+    accountInfo.email = a.getPreferredEmail();
+    accountInfo.name = a.getFullName();
+    accountInfo.username = a.getUserName();
+    return accountInfo;
+  }
+
+  public Map<String, ApprovalInfo> approvals(
+      Account a, Map<String, Short> approvals, Timestamp ts) {
+    Map<String, ApprovalInfo> result = new HashMap<>();
+    for (Map.Entry<String, Short> e : approvals.entrySet()) {
+      Integer value = e.getValue() != null ? Integer.valueOf(e.getValue()) : null;
+      result.put(e.getKey(), ChangeJson.getApprovalInfo(a.getId(), value, null, null, ts));
+    }
+    return result;
+  }
+
+  public void logEventListenerError(Object event, Object listener, Exception error) {
+    if (log.isDebugEnabled()) {
+      log.debug(
+          String.format(
+              "Error in event listener %s for event %s",
+              listener.getClass().getName(), event.getClass().getName()),
+          error);
+    } else {
+      log.warn(
+          "Error in listener {} for event {}: {}",
+          listener.getClass().getName(),
+          event.getClass().getName(),
+          error.getMessage());
+    }
+  }
+
+  public static void logEventListenerError(Object listener, Exception error) {
+    if (log.isDebugEnabled()) {
+      log.debug(String.format("Error in event listener %s", listener.getClass().getName()), error);
+    } else {
+      log.warn("Error in listener {}: {}", listener.getClass().getName(), error.getMessage());
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/GitReferenceUpdated.java

@@ -0,0 +1,231 @@
+// Copyright (C) 2012 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.events.GitReferenceUpdatedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Project;
+import com.google.inject.Inject;
+import org.eclipse.jgit.lib.BatchRefUpdate;
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.RefUpdate;
+import org.eclipse.jgit.transport.ReceiveCommand;
+
+public class GitReferenceUpdated {
+  public static final GitReferenceUpdated DISABLED =
+      new GitReferenceUpdated() {
+        @Override
+        public void fire(
+            Project.NameKey project,
+            RefUpdate refUpdate,
+            ReceiveCommand.Type type,
+            Account updater) {}
+
+        @Override
+        public void fire(Project.NameKey project, RefUpdate refUpdate, Account updater) {}
+
+        @Override
+        public void fire(
+            Project.NameKey project,
+            String ref,
+            ObjectId oldObjectId,
+            ObjectId newObjectId,
+            Account updater) {}
+
+        @Override
+        public void fire(Project.NameKey project, ReceiveCommand cmd, Account updater) {}
+
+        @Override
+        public void fire(Project.NameKey project, BatchRefUpdate batchRefUpdate, Account updater) {}
+      };
+
+  private final DynamicSet<GitReferenceUpdatedListener> listeners;
+  private final EventUtil util;
+
+  @Inject
+  GitReferenceUpdated(DynamicSet<GitReferenceUpdatedListener> listeners, EventUtil util) {
+    this.listeners = listeners;
+    this.util = util;
+  }
+
+  private GitReferenceUpdated() {
+    this.listeners = null;
+    this.util = null;
+  }
+
+  public void fire(
+      Project.NameKey project, RefUpdate refUpdate, ReceiveCommand.Type type, Account updater) {
+    fire(
+        project,
+        refUpdate.getName(),
+        refUpdate.getOldObjectId(),
+        refUpdate.getNewObjectId(),
+        type,
+        util.accountInfo(updater));
+  }
+
+  public void fire(Project.NameKey project, RefUpdate refUpdate, Account updater) {
+    fire(
+        project,
+        refUpdate.getName(),
+        refUpdate.getOldObjectId(),
+        refUpdate.getNewObjectId(),
+        ReceiveCommand.Type.UPDATE,
+        util.accountInfo(updater));
+  }
+
+  public void fire(
+      Project.NameKey project,
+      String ref,
+      ObjectId oldObjectId,
+      ObjectId newObjectId,
+      Account updater) {
+    fire(
+        project,
+        ref,
+        oldObjectId,
+        newObjectId,
+        ReceiveCommand.Type.UPDATE,
+        util.accountInfo(updater));
+  }
+
+  public void fire(Project.NameKey project, ReceiveCommand cmd, Account updater) {
+    fire(
+        project,
+        cmd.getRefName(),
+        cmd.getOldId(),
+        cmd.getNewId(),
+        cmd.getType(),
+        util.accountInfo(updater));
+  }
+
+  public void fire(Project.NameKey project, BatchRefUpdate batchRefUpdate, Account updater) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    for (ReceiveCommand cmd : batchRefUpdate.getCommands()) {
+      if (cmd.getResult() == ReceiveCommand.Result.OK) {
+        fire(
+            project,
+            cmd.getRefName(),
+            cmd.getOldId(),
+            cmd.getNewId(),
+            cmd.getType(),
+            util.accountInfo(updater));
+      }
+    }
+  }
+
+  private void fire(
+      Project.NameKey project,
+      String ref,
+      ObjectId oldObjectId,
+      ObjectId newObjectId,
+      ReceiveCommand.Type type,
+      AccountInfo updater) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    ObjectId o = oldObjectId != null ? oldObjectId : ObjectId.zeroId();
+    ObjectId n = newObjectId != null ? newObjectId : ObjectId.zeroId();
+    Event event = new Event(project, ref, o.name(), n.name(), type, updater);
+    for (GitReferenceUpdatedListener l : listeners) {
+      try {
+        l.onGitReferenceUpdated(event);
+      } catch (Exception e) {
+        util.logEventListenerError(this, l, e);
+      }
+    }
+  }
+
+  private static class Event implements GitReferenceUpdatedListener.Event {
+    private final String projectName;
+    private final String ref;
+    private final String oldObjectId;
+    private final String newObjectId;
+    private final ReceiveCommand.Type type;
+    private final AccountInfo updater;
+
+    Event(
+        Project.NameKey project,
+        String ref,
+        String oldObjectId,
+        String newObjectId,
+        ReceiveCommand.Type type,
+        AccountInfo updater) {
+      this.projectName = project.get();
+      this.ref = ref;
+      this.oldObjectId = oldObjectId;
+      this.newObjectId = newObjectId;
+      this.type = type;
+      this.updater = updater;
+    }
+
+    @Override
+    public String getProjectName() {
+      return projectName;
+    }
+
+    @Override
+    public String getRefName() {
+      return ref;
+    }
+
+    @Override
+    public String getOldObjectId() {
+      return oldObjectId;
+    }
+
+    @Override
+    public String getNewObjectId() {
+      return newObjectId;
+    }
+
+    @Override
+    public boolean isCreate() {
+      return type == ReceiveCommand.Type.CREATE;
+    }
+
+    @Override
+    public boolean isDelete() {
+      return type == ReceiveCommand.Type.DELETE;
+    }
+
+    @Override
+    public boolean isNonFastForward() {
+      return type == ReceiveCommand.Type.UPDATE_NONFASTFORWARD;
+    }
+
+    @Override
+    public AccountInfo getUpdater() {
+      return updater;
+    }
+
+    @Override
+    public String toString() {
+      return String.format(
+          "%s[%s,%s: %s -> %s]",
+          getClass().getSimpleName(), projectName, ref, oldObjectId, newObjectId);
+    }
+
+    @Override
+    public NotifyHandling getNotify() {
+      return NotifyHandling.ALL;
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/HashtagsEdited.java

@@ -0,0 +1,105 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.common.collect.ImmutableSortedSet;
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.events.HashtagsEditedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import java.sql.Timestamp;
+import java.util.Collection;
+import java.util.Set;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class HashtagsEdited {
+  private static final Logger log = LoggerFactory.getLogger(HashtagsEdited.class);
+
+  private final DynamicSet<HashtagsEditedListener> listeners;
+  private final EventUtil util;
+
+  @Inject
+  public HashtagsEdited(DynamicSet<HashtagsEditedListener> listeners, EventUtil util) {
+    this.listeners = listeners;
+    this.util = util;
+  }
+
+  public void fire(
+      Change change,
+      Account editor,
+      ImmutableSortedSet<String> hashtags,
+      Set<String> added,
+      Set<String> removed,
+      Timestamp when) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    try {
+      Event event =
+          new Event(
+              util.changeInfo(change), util.accountInfo(editor), hashtags, added, removed, when);
+      for (HashtagsEditedListener l : listeners) {
+        try {
+          l.onHashtagsEdited(event);
+        } catch (Exception e) {
+          util.logEventListenerError(this, l, e);
+        }
+      }
+    } catch (OrmException e) {
+      log.error("Couldn't fire event", e);
+    }
+  }
+
+  private static class Event extends AbstractChangeEvent implements HashtagsEditedListener.Event {
+
+    private Collection<String> updatedHashtags;
+    private Collection<String> addedHashtags;
+    private Collection<String> removedHashtags;
+
+    Event(
+        ChangeInfo change,
+        AccountInfo editor,
+        Collection<String> updated,
+        Collection<String> added,
+        Collection<String> removed,
+        Timestamp when) {
+      super(change, editor, when, NotifyHandling.ALL);
+      this.updatedHashtags = updated;
+      this.addedHashtags = added;
+      this.removedHashtags = removed;
+    }
+
+    @Override
+    public Collection<String> getHashtags() {
+      return updatedHashtags;
+    }
+
+    @Override
+    public Collection<String> getAddedHashtags() {
+      return addedHashtags;
+    }
+
+    @Override
+    public Collection<String> getRemovedHashtags() {
+      return removedHashtags;
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/PluginEvent.java

@@ -0,0 +1,65 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.events.PluginEventListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.inject.Inject;
+
+public class PluginEvent {
+  private final DynamicSet<PluginEventListener> listeners;
+
+  @Inject
+  PluginEvent(DynamicSet<PluginEventListener> listeners) {
+    this.listeners = listeners;
+  }
+
+  public void fire(String pluginName, String type, String data) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    Event e = new Event(pluginName, type, data);
+    for (PluginEventListener l : listeners) {
+      l.onPluginEvent(e);
+    }
+  }
+
+  private static class Event extends AbstractNoNotifyEvent implements PluginEventListener.Event {
+    private final String pluginName;
+    private final String type;
+    private final String data;
+
+    Event(String pluginName, String type, String data) {
+      this.pluginName = pluginName;
+      this.type = type;
+      this.data = data;
+    }
+
+    @Override
+    public String pluginName() {
+      return pluginName;
+    }
+
+    @Override
+    public String getType() {
+      return type;
+    }
+
+    @Override
+    public String getData() {
+      return data;
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/ReviewerAdded.java

@@ -0,0 +1,101 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.common.collect.Lists;
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.common.RevisionInfo;
+import com.google.gerrit.extensions.events.ReviewerAddedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.PatchSet;
+import com.google.gerrit.server.GpgException;
+import com.google.gerrit.server.patch.PatchListNotAvailableException;
+import com.google.gerrit.server.patch.PatchListObjectTooLargeException;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import java.io.IOException;
+import java.sql.Timestamp;
+import java.util.List;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ReviewerAdded {
+  private static final Logger log = LoggerFactory.getLogger(ReviewerAdded.class);
+
+  private final DynamicSet<ReviewerAddedListener> listeners;
+  private final EventUtil util;
+
+  @Inject
+  ReviewerAdded(DynamicSet<ReviewerAddedListener> listeners, EventUtil util) {
+    this.listeners = listeners;
+    this.util = util;
+  }
+
+  public void fire(
+      Change change, PatchSet patchSet, List<Account> reviewers, Account adder, Timestamp when) {
+    if (!listeners.iterator().hasNext() || reviewers.isEmpty()) {
+      return;
+    }
+
+    try {
+      Event event =
+          new Event(
+              util.changeInfo(change),
+              util.revisionInfo(change.getProject(), patchSet),
+              Lists.transform(reviewers, util::accountInfo),
+              util.accountInfo(adder),
+              when);
+      for (ReviewerAddedListener l : listeners) {
+        try {
+          l.onReviewersAdded(event);
+        } catch (Exception e) {
+          util.logEventListenerError(this, l, e);
+        }
+      }
+    } catch (PatchListObjectTooLargeException e) {
+      log.warn("Couldn't fire event: " + e.getMessage());
+    } catch (PatchListNotAvailableException
+        | GpgException
+        | IOException
+        | OrmException
+        | PermissionBackendException e) {
+      log.error("Couldn't fire event", e);
+    }
+  }
+
+  private static class Event extends AbstractRevisionEvent implements ReviewerAddedListener.Event {
+    private final List<AccountInfo> reviewers;
+
+    Event(
+        ChangeInfo change,
+        RevisionInfo revision,
+        List<AccountInfo> reviewers,
+        AccountInfo adder,
+        Timestamp when) {
+      super(change, revision, adder, when, NotifyHandling.ALL);
+      this.reviewers = reviewers;
+    }
+
+    @Override
+    public List<AccountInfo> getReviewers() {
+      return reviewers;
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/ReviewerDeleted.java

@@ -0,0 +1,138 @@
+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.common.ApprovalInfo;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.common.RevisionInfo;
+import com.google.gerrit.extensions.events.ReviewerDeletedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.PatchSet;
+import com.google.gerrit.server.GpgException;
+import com.google.gerrit.server.patch.PatchListNotAvailableException;
+import com.google.gerrit.server.patch.PatchListObjectTooLargeException;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import java.io.IOException;
+import java.sql.Timestamp;
+import java.util.Map;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ReviewerDeleted {
+  private static final Logger log = LoggerFactory.getLogger(ReviewerDeleted.class);
+
+  private final DynamicSet<ReviewerDeletedListener> listeners;
+  private final EventUtil util;
+
+  @Inject
+  ReviewerDeleted(DynamicSet<ReviewerDeletedListener> listeners, EventUtil util) {
+    this.listeners = listeners;
+    this.util = util;
+  }
+
+  public void fire(
+      Change change,
+      PatchSet patchSet,
+      Account reviewer,
+      Account remover,
+      String message,
+      Map<String, Short> newApprovals,
+      Map<String, Short> oldApprovals,
+      NotifyHandling notify,
+      Timestamp when) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    try {
+      Event event =
+          new Event(
+              util.changeInfo(change),
+              util.revisionInfo(change.getProject(), patchSet),
+              util.accountInfo(reviewer),
+              util.accountInfo(remover),
+              message,
+              util.approvals(reviewer, newApprovals, when),
+              util.approvals(reviewer, oldApprovals, when),
+              notify,
+              when);
+      for (ReviewerDeletedListener listener : listeners) {
+        try {
+          listener.onReviewerDeleted(event);
+        } catch (Exception e) {
+          util.logEventListenerError(this, listener, e);
+        }
+      }
+    } catch (PatchListObjectTooLargeException e) {
+      log.warn("Couldn't fire event: " + e.getMessage());
+    } catch (PatchListNotAvailableException
+        | GpgException
+        | IOException
+        | OrmException
+        | PermissionBackendException e) {
+      log.error("Couldn't fire event", e);
+    }
+  }
+
+  private static class Event extends AbstractRevisionEvent
+      implements ReviewerDeletedListener.Event {
+    private final AccountInfo reviewer;
+    private final String comment;
+    private final Map<String, ApprovalInfo> newApprovals;
+    private final Map<String, ApprovalInfo> oldApprovals;
+
+    Event(
+        ChangeInfo change,
+        RevisionInfo revision,
+        AccountInfo reviewer,
+        AccountInfo remover,
+        String comment,
+        Map<String, ApprovalInfo> newApprovals,
+        Map<String, ApprovalInfo> oldApprovals,
+        NotifyHandling notify,
+        Timestamp when) {
+      super(change, revision, remover, when, notify);
+      this.reviewer = reviewer;
+      this.comment = comment;
+      this.newApprovals = newApprovals;
+      this.oldApprovals = oldApprovals;
+    }
+
+    @Override
+    public AccountInfo getReviewer() {
+      return reviewer;
+    }
+
+    @Override
+    public String getComment() {
+      return comment;
+    }
+
+    @Override
+    public Map<String, ApprovalInfo> getNewApprovals() {
+      return newApprovals;
+    }
+
+    @Override
+    public Map<String, ApprovalInfo> getOldApprovals() {
+      return oldApprovals;
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/RevisionCreated.java

@@ -0,0 +1,92 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.common.RevisionInfo;
+import com.google.gerrit.extensions.events.RevisionCreatedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.PatchSet;
+import com.google.gerrit.server.GpgException;
+import com.google.gerrit.server.patch.PatchListNotAvailableException;
+import com.google.gerrit.server.patch.PatchListObjectTooLargeException;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import java.io.IOException;
+import java.sql.Timestamp;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class RevisionCreated {
+  private static final Logger log = LoggerFactory.getLogger(RevisionCreated.class);
+
+  private final DynamicSet<RevisionCreatedListener> listeners;
+  private final EventUtil util;
+
+  @Inject
+  RevisionCreated(DynamicSet<RevisionCreatedListener> listeners, EventUtil util) {
+    this.listeners = listeners;
+    this.util = util;
+  }
+
+  public void fire(
+      Change change, PatchSet patchSet, Account uploader, Timestamp when, NotifyHandling notify) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    try {
+      Event event =
+          new Event(
+              util.changeInfo(change),
+              util.revisionInfo(change.getProject(), patchSet),
+              util.accountInfo(uploader),
+              when,
+              notify);
+      for (RevisionCreatedListener l : listeners) {
+        try {
+          l.onRevisionCreated(event);
+        } catch (Exception e) {
+          util.logEventListenerError(this, l, e);
+        }
+      }
+    } catch (PatchListObjectTooLargeException e) {
+      log.warn("Couldn't fire event: " + e.getMessage());
+    } catch (PatchListNotAvailableException
+        | GpgException
+        | IOException
+        | OrmException
+        | PermissionBackendException e) {
+      log.error("Couldn't fire event", e);
+    }
+  }
+
+  private static class Event extends AbstractRevisionEvent
+      implements RevisionCreatedListener.Event {
+
+    Event(
+        ChangeInfo change,
+        RevisionInfo revision,
+        AccountInfo uploader,
+        Timestamp when,
+        NotifyHandling notify) {
+      super(change, revision, uploader, when, notify);
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/TopicEdited.java

@@ -0,0 +1,74 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.events.TopicEditedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import java.sql.Timestamp;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class TopicEdited {
+  private static final Logger log = LoggerFactory.getLogger(TopicEdited.class);
+
+  private final DynamicSet<TopicEditedListener> listeners;
+  private final EventUtil util;
+
+  @Inject
+  TopicEdited(DynamicSet<TopicEditedListener> listeners, EventUtil util) {
+    this.listeners = listeners;
+    this.util = util;
+  }
+
+  public void fire(Change change, Account account, String oldTopicName, Timestamp when) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    try {
+      Event event =
+          new Event(util.changeInfo(change), util.accountInfo(account), oldTopicName, when);
+      for (TopicEditedListener l : listeners) {
+        try {
+          l.onTopicEdited(event);
+        } catch (Exception e) {
+          util.logEventListenerError(this, l, e);
+        }
+      }
+    } catch (OrmException e) {
+      log.error("Couldn't fire event", e);
+    }
+  }
+
+  private static class Event extends AbstractChangeEvent implements TopicEditedListener.Event {
+    private final String oldTopic;
+
+    Event(ChangeInfo change, AccountInfo editor, String oldTopic, Timestamp when) {
+      super(change, editor, when, NotifyHandling.ALL);
+      this.oldTopic = oldTopic;
+    }
+
+    @Override
+    public String getOldTopic() {
+      return oldTopic;
+    }
+  }
+}

java/com/google/gerrit/server/extensions/events/VoteDeleted.java

@@ -0,0 +1,137 @@
+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.extensions.events;
+
+import com.google.gerrit.extensions.api.changes.NotifyHandling;
+import com.google.gerrit.extensions.common.AccountInfo;
+import com.google.gerrit.extensions.common.ApprovalInfo;
+import com.google.gerrit.extensions.common.ChangeInfo;
+import com.google.gerrit.extensions.common.RevisionInfo;
+import com.google.gerrit.extensions.events.VoteDeletedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.PatchSet;
+import com.google.gerrit.server.GpgException;
+import com.google.gerrit.server.patch.PatchListNotAvailableException;
+import com.google.gerrit.server.patch.PatchListObjectTooLargeException;
+import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+import java.io.IOException;
+import java.sql.Timestamp;
+import java.util.Map;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class VoteDeleted {
+  private static final Logger log = LoggerFactory.getLogger(VoteDeleted.class);
+
+  private final DynamicSet<VoteDeletedListener> listeners;
+  private final EventUtil util;
+
+  @Inject
+  VoteDeleted(DynamicSet<VoteDeletedListener> listeners, EventUtil util) {
+    this.listeners = listeners;
+    this.util = util;
+  }
+
+  public void fire(
+      Change change,
+      PatchSet ps,
+      Account reviewer,
+      Map<String, Short> approvals,
+      Map<String, Short> oldApprovals,
+      NotifyHandling notify,
+      String message,
+      Account remover,
+      Timestamp when) {
+    if (!listeners.iterator().hasNext()) {
+      return;
+    }
+    try {
+      Event event =
+          new Event(
+              util.changeInfo(change),
+              util.revisionInfo(change.getProject(), ps),
+              util.accountInfo(reviewer),
+              util.approvals(remover, approvals, when),
+              util.approvals(remover, oldApprovals, when),
+              notify,
+              message,
+              util.accountInfo(remover),
+              when);
+      for (VoteDeletedListener l : listeners) {
+        try {
+          l.onVoteDeleted(event);
+        } catch (Exception e) {
+          util.logEventListenerError(this, l, e);
+        }
+      }
+    } catch (PatchListObjectTooLargeException e) {
+      log.warn("Couldn't fire event: " + e.getMessage());
+    } catch (PatchListNotAvailableException
+        | GpgException
+        | IOException
+        | OrmException
+        | PermissionBackendException e) {
+      log.error("Couldn't fire event", e);
+    }
+  }
+
+  private static class Event extends AbstractRevisionEvent implements VoteDeletedListener.Event {
+    private final AccountInfo reviewer;
+    private final Map<String, ApprovalInfo> approvals;
+    private final Map<String, ApprovalInfo> oldApprovals;
+    private final String message;
+
+    Event(
+        ChangeInfo change,
+        RevisionInfo revision,
+        AccountInfo reviewer,
+        Map<String, ApprovalInfo> approvals,
+        Map<String, ApprovalInfo> oldApprovals,
+        NotifyHandling notify,
+        String message,
+        AccountInfo remover,
+        Timestamp when) {
+      super(change, revision, remover, when, notify);
+      this.reviewer = reviewer;
+      this.approvals = approvals;
+      this.oldApprovals = oldApprovals;
+      this.message = message;
+    }
+
+    @Override
+    public Map<String, ApprovalInfo> getApprovals() {
+      return approvals;
+    }
+
+    @Override
+    public Map<String, ApprovalInfo> getOldApprovals() {
+      return oldApprovals;
+    }
+
+    @Override
+    public String getMessage() {
+      return message;
+    }
+
+    @Override
+    public AccountInfo getReviewer() {
+      return reviewer;
+    }
+  }
+}