org.directwebremoting.bayeux.BayeuxClient Maven / Gradle / Ivy

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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.bayeux;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.directwebremoting.dwrp.Batch;
import org.directwebremoting.dwrp.PlainCallMarshaller;
import org.directwebremoting.extend.Call;
import org.directwebremoting.extend.Calls;
import org.directwebremoting.extend.ConverterManager;
import org.directwebremoting.extend.EnginePrivate;
import org.directwebremoting.extend.FormField;
import org.directwebremoting.extend.Remoter;
import org.directwebremoting.extend.Replies;
import org.directwebremoting.extend.Reply;
import org.directwebremoting.extend.ScriptConduit;

import dojox.cometd.Bayeux;
import dojox.cometd.Client;
import dojox.cometd.Listener;

/**
 * @author Greg Wilkins [gregw at webtide dot com]
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class BayeuxClient implements Listener
{
    public BayeuxClient(Bayeux bayeux)
    {
        this.bayeux = bayeux;

        // At this point BayeuxClient is fully initialized so it is safe to
        // allow other classes to see and use us.
        //noinspection ThisEscapedInObjectConstruction
        this.client = bayeux.newClient("dwr", this);
        bayeux.subscribe("/dwr", client);
    }

    /* (non-Javadoc)
     * @see dojox.cometd.Listener#deliver(dojox.cometd.Client, java.lang.String, java.lang.Object, java.lang.String)
     */
    public void deliver(Client fromClient, String toChannel, Object message, String msgId)
    {
        try
        {
            @SuppressWarnings("unchecked")
            Map msgParams = (Map) message;
            Map fileParams = new HashMap(msgParams.size());
            for (Map.Entry entry : msgParams.entrySet())
            {
                String param = (String) entry.getValue();
                FormField formField = new FormField(param);
                fileParams.put(entry.getKey(), formField);
            }

            Batch batch = new Batch(fileParams);
            Calls calls = plainCallMarshaller.marshallInbound(batch);

            log.debug("Calls="+calls);

            for (int i = 0; i < calls.getCallCount(); i++)
            {
                Call call = calls.getCall(i);
                Object[] params = call.getParameters();
                log.debug("Call[" + i + "]=" + call.getScriptName() + "." + call.getMethodName() + (params == null ? "[]" : Arrays.asList(params)));
            }

            Replies replies = remoter.execute(calls);

            ScriptConduit conduit = new BayeuxScriptConduit(converterManager, JSON_OUTPUT);
            for (Reply reply : replies)
            {
                String batchId = calls.getBatchId();
                log.debug("Reply="+reply+" BatchId="+batchId);

                if (reply.getThrowable() != null)
                {
                    Throwable ex = reply.getThrowable();
                    EnginePrivate.remoteHandleException(conduit, batchId, reply.getCallId(), ex);

                    log.warn("--Erroring: batchId[" + batchId + "] message[" + ex.toString() + ']');
                }
                else
                {
                    Object data = reply.getReply();
                    log.debug("data="+data);
                    EnginePrivate.remoteHandleCallback(conduit, batchId, reply.getCallId(), data);
                }
            }

            String output = conduit.toString();
            log.debug("<< "+output);
            bayeux.publish(client, "/dwr/"+fromClient.getId(), output, calls.getBatchId());
        }
        catch (Exception ex)
        {
            log.warn("Protocol Error", ex);
        }
    }

    /* (non-Javadoc)
     * @see dojox.cometd.Listener#removed(java.lang.String, boolean)
     */
    public void removed(String clientId, boolean timeout)
    {
    }

    /**
     * @param remoter
     */
    public void setRemoter(Remoter remoter)
    {
        this.remoter=remoter;
    }

    /**
     * @param converterManager
     */
    public void setConverterManager(ConverterManager converterManager)
    {
        this.converterManager=converterManager;
    }

    /**
     * @param plainCallMarshaller
     */
    public void setPlainCallMarshaller(PlainCallMarshaller plainCallMarshaller)
    {
        this.plainCallMarshaller=plainCallMarshaller;
    }

    /**
     * We're note constraining our output to JSON at the moment
     */
    private static final boolean JSON_OUTPUT = false;

    private Bayeux bayeux;

    private Client client;

    private Remoter remoter;

    private ConverterManager converterManager;
    
    private PlainCallMarshaller plainCallMarshaller;

    /**
     * The log stream
     */
    private static final Log log = LogFactory.getLog(BayeuxClient.class);
}