GAE/J 環境の Application Lifecycle Listener の実験

最近、GAE/J が Application Lifecycle Listener に対応していないという話を聞きました。現在 GAE 上で BlazeDS を動かそうとしている身としては、これはぜひともはっきりさせておきたいネタです。

ということで、ひとまず BlazeDS が使用している下記の３つのイベントリスナインタフェースを対象に実験してみました。

import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingListener;
import javax.servlet.http.HttpSessionListener;

開発環境上での実行結果

sessionCreated : id = 16es70wx6934m
attributeAdded : name = foo, value = bar
attributeReplaced : name = foo, value = bar
attributeRemoved : name = foo, value = hoge
valueBound : name = fumyo, value = null
attributeAdded : name = fumyo, value = listenertest.ApplicationLifecycleListener@1977b9b
valueUnbound : name = fumyo, value = null
attributeRemoved : name = fumyo, value = listenertest.ApplicationLifecycleListener@1977b9b
sessionDestroyed : id = 16es70wx6934m

本番環境での実行結果

sessionCreated : id = 8xj_3ZWLJhJRl4nrVAzsCw
attributeAdded : name = foo, value = bar
attributeReplaced : name = foo, value = bar
attributeRemoved : name = foo, value = hoge
valueBound : name = fumyo, value = null
attributeAdded : name = fumyo, value = listenertest.ApplicationLifecycleListener@13b625b
valueUnbound : name = fumyo, value = null
attributeRemoved : name = fumyo, value = listenertest.ApplicationLifecycleListener@13b625b
sessionDestroyed : id = 8xj_3ZWLJhJRl4nrVAzsCw

なんと、GAE/J 上で、上記のリスナーは完全に動作しているようです。(｀・ω・´)


テスト用サーブレットのソース

package listenertest;

import java.io.IOException;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@SuppressWarnings("serial")
public class ListenertestServlet extends HttpServlet {
 public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
  HttpSession session = req.getSession(true);
  session.setAttribute("foo", "bar");
  session.setAttribute("foo", "hoge");
  session.removeAttribute("foo");
  session.setAttribute("fumyo", new ApplicationLifecycleListener());
  session.removeAttribute("fumyo");
  session.invalidate();
  resp.setContentType("text/plain");
  resp.getWriter().println("Test complete!");
 }
}

テスト用リスナーのソース

package listenertest;

import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionBindingListener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

public class ApplicationLifecycleListener implements HttpSessionListener, HttpSessionAttributeListener, HttpSessionBindingListener {

 @Override
 public void sessionCreated(HttpSessionEvent event) {
  System.err.println("sessionCreated : id = " + event.getSession().getId());
 }

 @Override
 public void sessionDestroyed(HttpSessionEvent event) {
  System.err.println("sessionDestroyed : id = " + event.getSession().getId());
 }

 @Override
 public void attributeAdded(HttpSessionBindingEvent event) {
  System.err.println("attributeAdded : name = " + event.getName() + ", value = " + event.getValue());
 }

 @Override
 public void attributeRemoved(HttpSessionBindingEvent event) {
  System.err.println("attributeRemoved : name = " + event.getName() + ", value = " + event.getValue());
 }

 @Override
 public void attributeReplaced(HttpSessionBindingEvent event) {
  System.err.println("attributeReplaced : name = " + event.getName() + ", value = " + event.getValue());
 }

 @Override
 public void valueBound(HttpSessionBindingEvent event) {
  System.err.println("valueBound : name = " + event.getName() + ", value = " + event.getValue());
 }

 @Override
 public void valueUnbound(HttpSessionBindingEvent event) {
  System.err.println("valueUnbound : name = " + event.getName() + ", value = " + event.getValue());
 }
}