Define gerrit-extension-api module

This module will hold a set of thin interfaces that extensions can
build against. Extensions are more lightweight than plugins and have
a smaller surface of the Gerrit server available to them.

Change-Id: I4213004f1ba5c034cf8fc7fbb9f6dd53f3ec8a96

gerrit-extension-api/.gitignore

@@ -0,0 +1,6 @@
+/target
+/.classpath
+/.project
+/.settings/org.maven.ide.eclipse.prefs
+/.settings/org.eclipse.m2e.core.prefs
+/gerrit-extension-api.iml

gerrit-extension-api/.settings/org.eclipse.core.resources.prefs

@@ -0,0 +1,5 @@
+#Thu Jul 28 11:02:36 PDT 2011
+eclipse.preferences.version=1
+encoding//src/main/java=UTF-8
+encoding//src/test/java=UTF-8
+encoding/<project>=UTF-8

gerrit-extension-api/.settings/org.eclipse.core.runtime.prefs

@@ -0,0 +1,3 @@
+#Tue Sep 02 16:59:24 PDT 2008
+eclipse.preferences.version=1
+line.separator=\n

gerrit-extension-api/.settings/org.eclipse.jdt.core.prefs

@@ -0,0 +1,269 @@
+#Thu Jul 28 11:02:36 PDT 2011
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+org.eclipse.jdt.core.formatter.never_indent_block_comments_on_first_column=false
+org.eclipse.jdt.core.formatter.never_indent_line_comments_on_first_column=false
+org.eclipse.jdt.core.formatter.number_of_blank_lines_at_beginning_of_method_body=0
+org.eclipse.jdt.core.formatter.number_of_empty_lines_to_preserve=3
+org.eclipse.jdt.core.formatter.put_empty_statement_on_new_line=false
+org.eclipse.jdt.core.formatter.tabulation.char=space
+org.eclipse.jdt.core.formatter.tabulation.size=2
+org.eclipse.jdt.core.formatter.use_tabs_only_for_leading_indentations=false
+org.eclipse.jdt.core.formatter.wrap_before_binary_operator=true

gerrit-extension-api/.settings/org.eclipse.jdt.ui.prefs

@@ -0,0 +1,61 @@
+#Wed Jul 29 11:31:38 PDT 2009
+eclipse.preferences.version=1
+editor_save_participant_org.eclipse.jdt.ui.postsavelistener.cleanup=true
+formatter_profile=_Google Format
+formatter_settings_version=11
+org.eclipse.jdt.ui.ignorelowercasenames=true
+org.eclipse.jdt.ui.importorder=com.google;com;junit;net;org;java;javax;
+org.eclipse.jdt.ui.ondemandthreshold=99
+org.eclipse.jdt.ui.staticondemandthreshold=99
+org.eclipse.jdt.ui.text.custom_code_templates=<?xml version\="1.0" encoding\="UTF-8" standalone\="no"?><templates/>
+sp_cleanup.add_default_serial_version_id=true
+sp_cleanup.add_generated_serial_version_id=false
+sp_cleanup.add_missing_annotations=false
+sp_cleanup.add_missing_deprecated_annotations=true
+sp_cleanup.add_missing_methods=false
+sp_cleanup.add_missing_nls_tags=false
+sp_cleanup.add_missing_override_annotations=true
+sp_cleanup.add_serial_version_id=false
+sp_cleanup.always_use_blocks=true
+sp_cleanup.always_use_parentheses_in_expressions=false
+sp_cleanup.always_use_this_for_non_static_field_access=false
+sp_cleanup.always_use_this_for_non_static_method_access=false
+sp_cleanup.convert_to_enhanced_for_loop=false
+sp_cleanup.correct_indentation=false
+sp_cleanup.format_source_code=false
+sp_cleanup.format_source_code_changes_only=false
+sp_cleanup.make_local_variable_final=true
+sp_cleanup.make_parameters_final=true
+sp_cleanup.make_private_fields_final=true
+sp_cleanup.make_type_abstract_if_missing_method=false
+sp_cleanup.make_variable_declarations_final=false
+sp_cleanup.never_use_blocks=false
+sp_cleanup.never_use_parentheses_in_expressions=true
+sp_cleanup.on_save_use_additional_actions=true
+sp_cleanup.organize_imports=false
+sp_cleanup.qualify_static_field_accesses_with_declaring_class=false
+sp_cleanup.qualify_static_member_accesses_through_instances_with_declaring_class=true
+sp_cleanup.qualify_static_member_accesses_through_subtypes_with_declaring_class=true
+sp_cleanup.qualify_static_member_accesses_with_declaring_class=false
+sp_cleanup.qualify_static_method_accesses_with_declaring_class=false
+sp_cleanup.remove_private_constructors=true
+sp_cleanup.remove_trailing_whitespaces=true
+sp_cleanup.remove_trailing_whitespaces_all=true
+sp_cleanup.remove_trailing_whitespaces_ignore_empty=false
+sp_cleanup.remove_unnecessary_casts=false
+sp_cleanup.remove_unnecessary_nls_tags=false
+sp_cleanup.remove_unused_imports=false
+sp_cleanup.remove_unused_local_variables=false
+sp_cleanup.remove_unused_private_fields=true
+sp_cleanup.remove_unused_private_members=false
+sp_cleanup.remove_unused_private_methods=true
+sp_cleanup.remove_unused_private_types=true
+sp_cleanup.sort_members=false
+sp_cleanup.sort_members_all=false
+sp_cleanup.use_blocks=false
+sp_cleanup.use_blocks_only_for_return_and_throw=false
+sp_cleanup.use_parentheses_in_expressions=false
+sp_cleanup.use_this_for_non_static_field_access=false
+sp_cleanup.use_this_for_non_static_field_access_only_if_necessary=true
+sp_cleanup.use_this_for_non_static_method_access=false
+sp_cleanup.use_this_for_non_static_method_access_only_if_necessary=true

gerrit-extension-api/pom.xml

@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>com.google.gerrit</groupId>
+    <artifactId>gerrit-parent</artifactId>
+    <version>2.5-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>gerrit-extension-api</artifactId>
+  <name>Gerrit Code Review - Extension API</name>
+
+  <description>
+    Interfaces describing the extension API
+  </description>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.inject</groupId>
+      <artifactId>guice</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>com.google.inject.extensions</groupId>
+      <artifactId>guice-servlet</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.apache.tomcat</groupId>
+      <artifactId>servlet-api</artifactId>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-shade-plugin</artifactId>
+        <configuration>
+          <createSourcesJar>true</createSourcesJar>
+        </configuration>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>shade</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>

gerrit-extension-api/src/main/java/com/google/gerrit/extensions/annotations/Export.java

@@ -0,0 +1,52 @@
+// 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.extensions.annotations;
+
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+import com.google.inject.BindingAnnotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+/**
+ * Annotation applied to auto-registered, exported types.
+ * <p>
+ * Plugins or extensions using auto-registration should apply this annotation to
+ * any non-abstract class they want exported for access.
+ * <p>
+ * For SSH commands the @Export annotation names the subcommand:
+ *
+ * <pre>
+ *   @Export("print")
+ *   class MyCommand extends SshCommand {
+ * </pre>
+ *
+ * For HTTP servlets, the @Export annotation names the URL the servlet is bound
+ * to, relative to the plugin or extension's namespace within the Gerrit
+ * container.
+ *
+ * <pre>
+ *  @Export("/index.html")
+ *  class ShowIndexHtml extends HttpServlet {
+ * </pre>
+ */
+@Target({ElementType.TYPE})
+@Retention(RUNTIME)
+@BindingAnnotation
+public @interface Export {
+  String value();
+}

gerrit-extension-api/src/main/java/com/google/gerrit/extensions/annotations/ExportImpl.java

@@ -0,0 +1,52 @@
+// 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.extensions.annotations;
+
+import java.io.Serializable;
+import java.lang.annotation.Annotation;
+
+final class ExportImpl implements Export, Serializable {
+  private static final long serialVersionUID = 0;
+  private final String value;
+
+  ExportImpl(String value) {
+    this.value = value;
+  }
+
+  @Override
+  public Class<? extends Annotation> annotationType() {
+    return Export.class;
+  }
+
+  @Override
+  public String value() {
+    return value;
+  }
+
+  @Override
+  public int hashCode() {
+    return (127 * "value".hashCode()) ^ value.hashCode();
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    return o instanceof Export && value.equals(((Export) o).value());
+  }
+
+  @Override
+  public String toString() {
+    return "@" + Export.class.getName() + "(value=" + value + ")";
+  }
+}

gerrit-extension-api/src/main/java/com/google/gerrit/extensions/annotations/Exports.java

@@ -0,0 +1,26 @@
+// 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.extensions.annotations;
+
+/** Static constructors for {@link Export} annotations. */
+public final class Exports {
+  /** Create an annotation to export under a specific name. */
+  public static Export named(String name) {
+    return new ExportImpl(name);
+  }
+
+  private Exports() {
+  }
+}

gerrit-extension-api/src/main/java/com/google/gerrit/extensions/annotations/PluginName.java

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package com.google.gerrit.server.plugins;
+package com.google.gerrit.extensions.annotations;
 
 import static java.lang.annotation.RetentionPolicy.RUNTIME;
 
@@ -22,6 +22,19 @@ import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
 import java.lang.annotation.Target;
 
+/**
+ * Annotation applied to a String containing the plugin or extension name.
+ * <p>
+ * A plugin or extension may receive this string by Guice injection to discover
+ * the name that an administrator has installed the plugin or extension under:
+ *
+ * <pre>
+ *  @Inject
+ *  MyType(@PluginName String myName) {
+ *  ...
+ *  }
+ * </pre>
+ */
 @Target({ElementType.PARAMETER, ElementType.FIELD})
 @Retention(RUNTIME)
 @BindingAnnotation

gerrit-extension-api/src/main/java/com/google/gerrit/extensions/registration/RegistrationHandle.java

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package com.google.gerrit.server.plugins;
+package com.google.gerrit.extensions.registration;
 
 /** Handle for registered information. */
 public interface RegistrationHandle {

gerrit-httpd/src/main/java/com/google/gerrit/httpd/plugins/HttpPluginServlet.java

@@ -17,9 +17,9 @@ package com.google.gerrit.httpd.plugins;
 import com.google.common.base.Strings;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
+import com.google.gerrit.extensions.registration.RegistrationHandle;
 import com.google.gerrit.server.MimeUtilFileTypeRegistry;
 import com.google.gerrit.server.plugins.Plugin;
-import com.google.gerrit.server.plugins.RegistrationHandle;
 import com.google.gerrit.server.plugins.ReloadPluginListener;
 import com.google.gerrit.server.plugins.StartPluginListener;
 import com.google.inject.Inject;

gerrit-server/pom.xml

@@ -121,6 +121,12 @@ limitations under the License.
       <version>${project.version}</version>
     </dependency>
 
+    <dependency>
+      <groupId>com.google.gerrit</groupId>
+      <artifactId>gerrit-extension-api</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+
     <dependency>
       <groupId>com.google.gerrit</groupId>
       <artifactId>gerrit-util-cli</artifactId>

gerrit-server/src/main/java/com/google/gerrit/server/plugins/Plugin.java

@@ -15,6 +15,8 @@
 package com.google.gerrit.server.plugins;
 
 import com.google.common.base.Strings;
+import com.google.gerrit.extensions.annotations.PluginName;
+import com.google.gerrit.extensions.registration.RegistrationHandle;
 import com.google.gerrit.lifecycle.LifecycleListener;
 import com.google.gerrit.lifecycle.LifecycleManager;
 import com.google.inject.AbstractModule;

gerrit-sshd/src/main/java/com/google/gerrit/sshd/DispatchCommandProvider.java

@@ -15,7 +15,7 @@
 package com.google.gerrit.sshd;
 
 import com.google.common.collect.Maps;
-import com.google.gerrit.server.plugins.RegistrationHandle;
+import com.google.gerrit.extensions.registration.RegistrationHandle;
 import com.google.inject.Binding;
 import com.google.inject.Inject;
 import com.google.inject.Injector;

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/PluginCommandModule.java

@@ -15,7 +15,7 @@
 package com.google.gerrit.sshd.commands;
 
 import com.google.common.base.Preconditions;
-import com.google.gerrit.server.plugins.PluginName;
+import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.sshd.CommandName;
 import com.google.gerrit.sshd.Commands;
 import com.google.gerrit.sshd.DispatchCommandProvider;

pom.xml

@@ -87,6 +87,7 @@ limitations under the License.
     <module>gerrit-gwtdebug</module>
     <module>gerrit-war</module>
 
+    <module>gerrit-extension-api</module>
     <module>gerrit-plugin-api</module>
 
     <module>gerrit-gwtui</module>

tools/deploy_api.sh

@@ -0,0 +1,39 @@
+#!/bin/sh
+
+SRC=$(ls gerrit-plugin-api/target/gerrit-plugin-api-*-sources.jar)
+VER=${SRC#gerrit-plugin-api/target/gerrit-plugin-api-}
+VER=${VER%-sources.jar}
+
+type=release
+case $VER in
+*-SNAPSHOT)
+  echo >&2 "fatal: Cannot deploy $VER"
+  echo >&2 "       Use ./tools/version.sh --release && mvn clean package"
+  exit 1
+  ;;
+*-[0-9]*-g*) type=snapshot ;;
+esac
+URL=s3://gerrit-api@commondatastorage.googleapis.com/$type
+
+echo "Deploying API $VER to $URL"
+for module in gerrit-extension-api gerrit-plugin-api
+do
+  mvn deploy:deploy-file \
+    -DgroupId=com.google.gerrit \
+    -DartifactId=$module \
+    -Dversion=$VER \
+    -Dpackaging=jar \
+    -Dfile=$module/target/$module-$VER.jar \
+    -DrepositoryId=gerrit-api-repository \
+    -Durl=$URL
+
+  mvn deploy:deploy-file \
+    -DgroupId=com.google.gerrit \
+    -DartifactId=$module \
+    -Dversion=$VER \
+    -Dpackaging=java-source \
+    -Dfile=$module/target/$module-$VER-sources.jar \
+    -Djava-source=false \
+    -DrepositoryId=gerrit-api-repository \
+    -Durl=$URL
+done

tools/deploy_plugin_api.sh

@@ -1,37 +0,0 @@
-#!/bin/sh
-
-SRC=$(ls gerrit-plugin-api/target/gerrit-plugin-api-*-sources.jar)
-VER=${SRC#gerrit-plugin-api/target/gerrit-plugin-api-}
-VER=${VER%-sources.jar}
-JAR=gerrit-plugin-api/target/gerrit-plugin-api-$VER.jar
-
-type=release
-case $VER in
-*-SNAPSHOT)
-  echo >&2 "fatal: Cannot deploy $VER"
-  echo >&2 "       Use ./tools/version.sh --release && mvn clean package"
-  exit 1
-  ;;
-*-[0-9]*-g*) type=snapshot ;;
-esac
-URL=s3://gerrit-api@commondatastorage.googleapis.com/$type
-
-echo "Deploying gerrit-plugin-api $VER to $URL"
-mvn deploy:deploy-file \
-  -DgroupId=com.google.gerrit \
-  -DartifactId=gerrit-plugin-api \
-  -Dversion=$VER \
-  -Dpackaging=jar \
-  -Dfile=$JAR \
-  -DrepositoryId=gerrit-api-repository \
-  -Durl=$URL
-
-mvn deploy:deploy-file \
-  -DgroupId=com.google.gerrit \
-  -DartifactId=gerrit-plugin-api \
-  -Dversion=$VER \
-  -Dpackaging=java-source \
-  -Dfile=$SRC \
-  -Djava-source=false \
-  -DrepositoryId=gerrit-api-repository \
-  -Durl=$URL