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diff --git a/java/com/google/gerrit/extensions/config/FactoryModule.java b/java/com/google/gerrit/extensions/config/FactoryModule.java
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+// Copyright (C) 2009 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.config;
+
+import com.google.inject.AbstractModule;
+import com.google.inject.assistedinject.FactoryModuleBuilder;
+
+public abstract class FactoryModule extends AbstractModule {
+  /**
+   * Register an assisted injection factory.
+   *
+   * <p>This function provides an automatic way to define a factory that creates a concrete type
+   * through assisted injection. For example to configure the following assisted injection case:
+   *
+   * <pre>
+   * public class Foo {
+   *   public interface Factory {
+   *     Foo create(int a);
+   *   }
+   *   &#064;Inject
+   *   Foo(Logger log, @Assisted int a) {...}
+   * }
+   * </pre>
+   *
+   * Just pass {@code Foo.Factory.class} to this method. The factory will be generated to return its
+   * one return type as declared in the creation method.
+   *
+   * @param factory interface which specifies the bean factory method.
+   */
+  protected void factory(Class<?> factory) {
+    install(new FactoryModuleBuilder().build(factory));
+  }
+}