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Jetty example source code file (AsyncRemoteServiceServlet.java)

This example Jetty source code file (AsyncRemoteServiceServlet.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Jetty tags/keywords

asyncremoteserviceservlet, http, io, ioexception, jetty_retry_request_exception, openremoteserviceservlet, openremoteserviceservlet, payload, request, response, runtimeexception, servlet, servletexception, servletexception, string, string, unexpectedexception, unexpectedexception

The Jetty AsyncRemoteServiceServlet.java source code

/*
 * Copyright 2006 Google Inc.
 * 
 * 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.mortbay.gwt;

import com.google.gwt.user.server.rpc.OpenRemoteServiceServlet;
import com.google.gwt.user.server.rpc.UnexpectedException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.ServletException;
import java.io.IOException;

/**
 * Jetty Continuation support for GWT RPC.
 * 
 * @author Craig Day (craig@alderaan.com.au)
 */
public class AsyncRemoteServiceServlet extends OpenRemoteServiceServlet {

    public static final String PAYLOAD = "com.google.gwt.payload";

    private static final String JETTY_RETRY_REQUEST_EXCEPTION = "org.mortbay.jetty.RetryRequest";

    /* ------------------------------------------------------------ */
    /* (non-Javadoc)
     * @see com.google.gwt.user.server.rpc.OpenRemoteServiceServlet#readPayloadAsUtf8(javax.servlet.http.HttpServletRequest)
     */
    protected String readPayloadAsUtf8(HttpServletRequest request) throws IOException, ServletException {
        String payload = (String) request.getAttribute(PAYLOAD);
        if (payload == null) {
            payload = super.readPayloadAsUtf8(request);
            request.setAttribute(PAYLOAD, payload);
        }
        return payload;
    }


    /**
     * Overridden to really throw Jetty RetryRequest Exception (as opposed to sending failure to client).
     *
     * @param caught the exception
     */
    protected void doUnexpectedFailure(Throwable caught) {
        throwIfRetryRequest(caught);
        super.doUnexpectedFailure(caught);
    }

    /**
     * Throws the Jetty RetryRequest if found.
     *
     * @param caught the exception
     */
    protected void throwIfRetryRequest(Throwable caught) {
        if (caught instanceof UnexpectedException) {
            caught = caught.getCause();
        }

        if (JETTY_RETRY_REQUEST_EXCEPTION.equals(caught.getClass().getName())) {
            throw (RuntimeException) caught;
        }
    }


}

Other Jetty examples (source code examples)

Here is a short list of links related to this Jetty AsyncRemoteServiceServlet.java source code file:

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