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API for Gerrit Plugins

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package com.google.gerrit.lifecycle;

import com.google.gerrit.extensions.config.FactoryModule;
import com.google.gerrit.extensions.events.LifecycleListener;
import com.google.inject.Singleton;
import com.google.inject.binder.LinkedBindingBuilder;
import com.google.inject.internal.UniqueAnnotations;
import java.lang.annotation.Annotation;

/** Module to support registering a unique LifecyleListener. */
public abstract class LifecycleModule extends FactoryModule {
  /**
   * @return a unique listener binding.
   *     To create a listener binding use:
   *     
   * listener().to(MyListener.class);
   * 
   *     where {@code MyListener} is a {@link Singleton} implementing the {@link LifecycleListener}
   *     interface.
   */
  protected LinkedBindingBuilder listener() {
    final Annotation id = UniqueAnnotations.create();
    return bind(LifecycleListener.class).annotatedWith(id);
  }
}