com.googlecode.objectify.cache.AsyncCacheFilter Maven / Gradle / Ivy

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*** THIS VERSION UPLOADED FOR USE WITH CEDAR-COMMON, TO AVOID DEPENDENCIES ON GOOGLE CODE-BASED MAVEN REPOSITORIES. *** The simplest convenient interface to the Google App Engine datastore

The newest version!

package com.googlecode.objectify.cache;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

/**
 * This Filter is a companion to the CachingAsyncDatastoreService, and must be
 * installed any time the CachingAsyncDatastoreService is used.
 *
 * This Filter is a temporary measure until Google provides a hook that lets
 * us intercept the raw Future calls at the end of a request.  At that point
 * this filter can be eliminated in favor of the hook.
 *
 * In your web.xml:
 * *       <filter>
 *              <filter-name>AsyncCacheFilter</filter-name>
 *              <filter-class>com.googlecode.objectify.cache.AsyncCacheFilter</filter-class>
 *      </filter>
 *      <filter-mapping>
 *              <filter-name>AsyncCacheFilter</filter-name>
 *              <url-pattern>/*</url-pattern>
 *      </filter-mapping>
 *
 *
 * Or, if you use Guice:
 *
 * *      filter("/*").through(AsyncCacheFilter.class);
 *
 *
 * @author Jeff Schnitzer 
 */
public class AsyncCacheFilter implements Filter
{
	@Override
	public void init(FilterConfig config) throws ServletException
	{
	}

	@Override
	public void destroy()
	{
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException
	{
		try
		{
			chain.doFilter(request, response);
		}
		finally
		{
			TriggerFutureHook.completeAllPendingFutures();
		}
	}
}