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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;

/**
 * The heart of DWR is a system to generate content from some requests.
 * This interface generates scripts and executes remote calls.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface Remoter
{
    /**
     * Generate some Javascript that forms an interface definition
     * @param scriptName The script to generate for
     * @param path The path of the requests.
     * @return An interface javascript
     * @throws SecurityException
     */
    String generateInterfaceScript(String scriptName, String path) throws SecurityException;

    /**
     * Execute a set of remote calls and generate set of reply data for later
     * conversion to whatever wire protocol we are using today.
     * @param calls The set of calls to execute
     * @return A set of reply data objects
     */
    Replies execute(Calls calls);
}