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Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache.

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//
//  ========================================================================
//  Copyright (c) 1995-2012 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.server;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.jetty.server.handler.HandlerCollection;
import org.eclipse.jetty.server.handler.HandlerWrapper;
import org.eclipse.jetty.util.component.Destroyable;
import org.eclipse.jetty.util.component.LifeCycle;

/* ------------------------------------------------------------ */
/** A Jetty Server Handler.
 * 
 * A Handler instance is required by a {@link Server} to handle incoming
 * HTTP requests.  A Handler may: 
 * Completely generate the HTTP Response
 * Examine/modify the request and call another Handler (see {@link HandlerWrapper}).
 * 
Pass the request to one or more other Handlers (see {@link HandlerCollection}).
 * 
 * 
 * Handlers are passed the servlet API request and response object, but are 
 * not Servlets.  The servlet container is implemented by handlers for 
 * context, security, session and servlet that modify the request object 
 * before passing it to the next stage of handling.
 * 
 */
public interface Handler extends LifeCycle, Destroyable
{
    /* ------------------------------------------------------------ */
    /** Handle a request.
     * @param target The target of the request - either a URI or a name.
     * @param baseRequest The original unwrapped request object.
     * @param request The request either as the {@link Request}
     * object or a wrapper of that request. The {@link AbstractHttpConnection#getCurrentConnection()} 
     * method can be used access the Request object if required.
     * @param response The response as the {@link Response}
     * object or a wrapper of that request. The {@link AbstractHttpConnection#getCurrentConnection()} 
     * method can be used access the Response object if required.
     * @throws IOException
     * @throws ServletException
     */
    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
        throws IOException, ServletException;
    
    public void setServer(Server server);
    public Server getServer();
    
    public void destroy();
    
}