org.directwebremoting.server.servlet3.Servlet30ContainerAbstraction Maven / Gradle / Ivy

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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.

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/*
 * Copyright 2005 Joe Walker
 *
 * 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 org.directwebremoting.server.servlet3;

import java.io.IOException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.directwebremoting.extend.ContainerAbstraction;
import org.directwebremoting.extend.RealScriptSession;
import org.directwebremoting.extend.ScriptConduit;
import org.directwebremoting.extend.ServerLoadMonitor;
import org.directwebremoting.extend.Sleeper;
import org.directwebremoting.impl.DefaultServerLoadMonitor;
import org.directwebremoting.impl.ThreadWaitSleeper;

/**
 * An abstraction of the servlet container that just follows the standards
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class Servlet30ContainerAbstraction implements ContainerAbstraction
{
    /* (non-Javadoc)
     * @see org.directwebremoting.dwrp.ContainerAbstraction#isNativeEnvironment(javax.servlet.ServletConfig)
     */
    public boolean isNativeEnvironment(ServletConfig servletConfig)
    {
        ServletContext ctx = servletConfig.getServletContext();
        return ctx.getMajorVersion() >= 3 && ctx.getEffectiveMajorVersion() >= 3;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.dwrp.ContainerAbstraction#getServerLoadMonitorImplementation()
     */
    public Class getServerLoadMonitorImplementation()
    {
        return DefaultServerLoadMonitor.class;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.ContainerAbstraction#isResponseCompleted(javax.servlet.http.HttpServletRequest)
     */
    public boolean handleResumedRequest(HttpServletRequest request)
    {
        return false;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.ContainerAbstraction#createSleeper(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, org.directwebremoting.extend.RealScriptSession, org.directwebremoting.extend.ScriptConduit)
     */
    public Sleeper createSleeper(HttpServletRequest request, HttpServletResponse response, RealScriptSession scriptSession, ScriptConduit conduit) throws IOException
    {
        if (request.isAsyncSupported()) {
            return new Servlet30Sleeper(request, response, scriptSession, conduit);
        } else {
            return new ThreadWaitSleeper(response, scriptSession, conduit);
        }
    }
}