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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;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Accessor for the current {@link WebContext}.
* @author Joe Walker [joe at getahead dot ltd dot uk]
*/
public class WebContextFactory
{
/**
* Accessor for the current {@link WebContext}.
* @return The current WebContext or null if the current thread was not
* started by DWR.
*/
public static WebContext get()
{
if (builder == null)
{
return null;
}
return builder.get();
}
/**
* The WebContextBuilder from which we will get WebContext objects
*/
private static WebContextBuilder builder = null;
/**
* Internal method to allow us to get the WebContextBuilder from which we
* will get WebContext objects.
* Do NOT call this method from outside of DWR.
*/
public static void attach(Container container)
{
WebContextFactory.builder = container.getBean(WebContextBuilder.class);
}
/**
* Class to enable us to access servlet parameters.
* This class is for internal use only.
*/
public interface WebContextBuilder
{
/**
* Accessor for the WebContext that is associated with this thread.
* This method is only for use internally to DWR.
* @see WebContextFactory#get()
*/
WebContext get();
/**
* Make the current thread know what the current request is.
* This method is only for use internally to DWR.
* @param container The IoC container
* @param request The incoming http request
* @param response The outgoing http reply
* @see #disengageThread()
*/
void engageThread(Container container, HttpServletRequest request, HttpServletResponse response);
/**
* Make the current thread know what the current request is.
* Uses an existing WebContext for example from another thread.
* This method is only for use internally to DWR.
* @see #disengageThread()
*/
void engageThread(WebContext webContext);
/**
* Unset the current ExecutionContext
* This method is only for use internally to DWR.
* @see #engageThread(Container, HttpServletRequest, HttpServletResponse)
*/
void disengageThread();
}
/**
* The log stream
*/
private static final Log log = LogFactory.getLog(WebContextFactory.class);
}
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