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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.io;

/**
 * Represents a callback function, passed in from a client for later execution.
 * 

A JavascriptFunction is tied to a specific function in a specific browser * page. In this way the eval of a JavascriptFunction is outside of the normal * execution scoping provided by {@link org.directwebremoting.Browser}. * @author Joe Walker [joe at getahead dot ltd dot uk] */ public interface JavascriptFunction { /** * Execute the function. * TODO: At some stage it would be good to allow the final parameter to be * a Callback.... * @param params The data to pass to the server */ public void execute(Object... params); /** * A small amount of data is stored on the client to track the remotely. * accessible objects. To clear this data, the function needs to be cleared * on the server. */ public void close(); /** * Execute the function, and clear it's data from the client. * @param params The data to pass to the server * @see #execute * @see #close */ public void executeAndClose(Object... params); }





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