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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.extend;

import org.directwebremoting.ui.Callback;

/**
 * TODO: can we make this work without a factory?
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface CallbackHelper
{
    /**
     * Used by the many proxy classes to record a callback for later calling
     * @param callback The callback that acts on the type
     * @param type The type of the data that we are recording
     * @return A key under which the data is stored
     */
    public  String saveCallback(Callback callback, Class type);
}