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Java example source code file (GuiceServletContextListener.java)

This example Java source code file (GuiceServletContextListener.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

guiceservletcontextlistener, injector, injector_name, servlet, servletcontext, string, weakreference

The GuiceServletContextListener.java Java example source code

/**
 * Copyright (C) 2007 Google Inc.
 *
 * 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.inject.servlet;

import com.google.inject.Injector;

import java.lang.ref.WeakReference;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

/**
 * As of Guice 2.0 you can still use (your subclasses of) {@code GuiceServletContextListener}
 * class as a logical place to create and configure your injector. This will ensure the injector
 * is created when the web application is deployed.
 * 
 * @author Kevin Bourrillion (kevinb@google.com)
 * @since 2.0
 */
public abstract class GuiceServletContextListener
    implements ServletContextListener {

  static final String INJECTOR_NAME = Injector.class.getName();

  public void contextInitialized(ServletContextEvent servletContextEvent) {
    final ServletContext servletContext = servletContextEvent.getServletContext();

    // Set the Servletcontext early for those people who are using this class.
    // NOTE(dhanji): This use of the servletContext is deprecated.
    GuiceFilter.servletContext = new WeakReference<ServletContext>(servletContext);

    Injector injector = getInjector();
    injector.getInstance(InternalServletModule.BackwardsCompatibleServletContextProvider.class)
        .set(servletContext);
    servletContext.setAttribute(INJECTOR_NAME, injector);
  }

  public void contextDestroyed(ServletContextEvent servletContextEvent) {
    ServletContext servletContext = servletContextEvent.getServletContext();
    servletContext.removeAttribute(INJECTOR_NAME);
  }

  /**
   * Override this method to create (or otherwise obtain a reference to) your
   * injector.
   */
  protected abstract Injector getInjector();
}

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