Create account-indexed extension point

Add a new extension point so that plugins can be notified when an
account has been indexed.

Change-Id: I5cba1be9df06b70d870540722d099c3d8397c351

Documentation/dev-plugins.txt

@@ -416,7 +416,11 @@ Garbage collection ran on a project
 
 * `com.google.gerrit.server.extensions.events.ChangeIndexedListener`:
 +
-Update of the secondary index
+Update of the change secondary index
+
+* `com.google.gerrit.server.extensions.events.AccountIndexedListener`:
++
+Update of the account secondary index
 
 [[stream-events]]
 == Sending Events to the Events Stream

gerrit-extension-api/src/main/java/com/google/gerrit/extensions/events/AccountIndexedListener.java

@@ -0,0 +1,29 @@
+// Copyright (C) 2017 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.extensions.events;
+
+import com.google.gerrit.extensions.annotations.ExtensionPoint;
+
+/**
+ * Notified whenever an account is indexed
+ */
+@ExtensionPoint
+public interface AccountIndexedListener {
+/**
+ * Invoked when an account is indexed
+ * @param id of the account
+ */
+  void onAccountIndexed(int id);
+}

gerrit-server/src/main/java/com/google/gerrit/server/config/GerritGlobalModule.java

@@ -29,6 +29,7 @@ import com.google.gerrit.extensions.config.DownloadCommand;
 import com.google.gerrit.extensions.config.DownloadScheme;
 import com.google.gerrit.extensions.config.ExternalIncludedIn;
 import com.google.gerrit.extensions.config.FactoryModule;
+import com.google.gerrit.extensions.events.AccountIndexedListener;
 import com.google.gerrit.extensions.events.AgreementSignupListener;
 import com.google.gerrit.extensions.events.ChangeAbandonedListener;
 import com.google.gerrit.extensions.events.ChangeIndexedListener;
@@ -319,6 +320,7 @@ public class GerritGlobalModule extends FactoryModule {
     DynamicSet.setOf(binder(), PostReceiveHook.class);
     DynamicSet.setOf(binder(), PreUploadHook.class);
     DynamicSet.setOf(binder(), PostUploadHook.class);
+    DynamicSet.setOf(binder(), AccountIndexedListener.class);
     DynamicSet.setOf(binder(), ChangeIndexedListener.class);
     DynamicSet.setOf(binder(), NewProjectCreatedListener.class);
     DynamicSet.setOf(binder(), ProjectDeletedListener.class);

gerrit-server/src/main/java/com/google/gerrit/server/index/account/AccountIndexerImpl.java

@@ -16,6 +16,8 @@ package com.google.gerrit.server.index.account;
 
 import com.google.common.collect.ImmutableSet;
 import com.google.gerrit.common.Nullable;
+import com.google.gerrit.extensions.events.AccountIndexedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
 import com.google.gerrit.reviewdb.client.Account;
 import com.google.gerrit.server.account.AccountCache;
 import com.google.gerrit.server.account.AccountState;
@@ -34,21 +36,26 @@ public class AccountIndexerImpl implements AccountIndexer {
   }
 
   private final AccountCache byIdCache;
+  private final DynamicSet<AccountIndexedListener> indexedListener;
   private final AccountIndexCollection indexes;
   private final AccountIndex index;
 
   @AssistedInject
   AccountIndexerImpl(AccountCache byIdCache,
+      DynamicSet<AccountIndexedListener> indexedListener,
       @Assisted AccountIndexCollection indexes) {
     this.byIdCache = byIdCache;
+    this.indexedListener = indexedListener;
     this.indexes = indexes;
     this.index = null;
   }
 
   @AssistedInject
   AccountIndexerImpl(AccountCache byIdCache,
+      DynamicSet<AccountIndexedListener> indexedListener,
       @Assisted AccountIndex index) {
     this.byIdCache = byIdCache;
+    this.indexedListener = indexedListener;
     this.indexes = null;
     this.index = index;
   }
@@ -58,6 +65,13 @@ public class AccountIndexerImpl implements AccountIndexer {
     for (Index<?, AccountState> i : getWriteIndexes()) {
       i.replace(byIdCache.get(id));
     }
+    fireAccountIndexedEvent(id.get());
+  }
+
+  private void fireAccountIndexedEvent(int id) {
+    for (AccountIndexedListener listener : indexedListener) {
+      listener.onAccountIndexed(id);
+    }
   }
 
   private Collection<AccountIndex> getWriteIndexes() {