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Jetty example source code file (MessageImpl.java)

This example Jetty source code file (MessageImpl.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

atomicinteger, hashmap, illegalstateexception, json, message, message, messageimpl, messageimpl, object, object, set, string, string, stringbuffer, util

The Jetty MessageImpl.java source code

package org.mortbay.cometd;

import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;

import org.mortbay.util.ajax.JSON;

import dojox.cometd.Bayeux;
import dojox.cometd.Message;

public class MessageImpl extends HashMap<String, Object> implements Message, org.mortbay.util.ajax.JSON.Generator
{
    MessagePool _pool;
    String _clientId;
    String _json;
    String _channel;
    String _id;
    Object _data;
    Message _associated;
    AtomicInteger _refs=new AtomicInteger();

    /* ------------------------------------------------------------ */
    public MessageImpl()
    {
        super(8);
    }
    
    /* ------------------------------------------------------------ */
    public MessageImpl(MessagePool bayeux)
    {
        super(8);
        _pool=bayeux;
    }
    
    /* ------------------------------------------------------------ */
    public void incRef()
    {
        _refs.getAndIncrement();
    }

    /* ------------------------------------------------------------ */
    public void decRef()
    {
        int r= _refs.decrementAndGet();
        if (r==0 && _pool!=null)
            _pool.recycleMessage(this);
        else if (r<0)
            throw new IllegalStateException();
    }

    /* ------------------------------------------------------------ */
    public String getChannel()
    {
        return _channel;
    }
    
    /* ------------------------------------------------------------ */
    public String getClientId()
    {
        if (_clientId==null)
            _clientId=(String)get(Bayeux.CLIENT_FIELD);
        return _clientId;
    }

    /* ------------------------------------------------------------ */
    public String getId()
    {
        return _id;
    }

    /* ------------------------------------------------------------ */
    public Object getData()
    {
        return _data;
    }
    
    /* ------------------------------------------------------------ */
    public void addJSON(StringBuffer buffer)
    {
        buffer.append(getJSON());
    }

    /* ------------------------------------------------------------ */
    public String getJSON()
    {
        if (_json==null)
        {
            JSON json=_pool==null?JSON.getDefault():_pool.getMsgJSON();
            StringBuffer buf = new StringBuffer(json.getStringBufferSize());
            synchronized(buf)
            {
                json.appendMap(buf,this);
                _json=buf.toString();
            }
        }
        return _json;
    }
    
    /* ------------------------------------------------------------ */
    /* (non-Javadoc)
     * @see java.util.HashMap#clear()
     */
    public void clear()
    {
        _json=null;
        _id=null;
        _channel=null;
        _clientId=null;
        setAssociated(null);
        _refs.set(0);
        Iterator<Map.Entry iterator=super.entrySet().iterator();
        while(iterator.hasNext())
        {
            Map.Entry<String, Object> entry=iterator.next();
            String key=entry.getKey();
            if (Bayeux.CHANNEL_FIELD.equals(key))
                entry.setValue(null);
            else if (Bayeux.ID_FIELD.equals(key))
                entry.setValue(null);
            else if (Bayeux.TIMESTAMP_FIELD.equals(key))
                entry.setValue(null);
            else if (Bayeux.DATA_FIELD.equals(key))
                entry.setValue(null);
            else
                iterator.remove();
        }
        super.clear();
    }

    /* ------------------------------------------------------------ */
    /* (non-Javadoc)
     * @see java.util.HashMap#put(java.lang.Object, java.lang.Object)
     */
    public Object put(String key, Object value)
    {
        _json=null;
        if (Bayeux.CHANNEL_FIELD.equals(key))
            _channel=(String)value;
        else if (Bayeux.ID_FIELD.equals(key))
            _id=value.toString();
        else if (Bayeux.CLIENT_FIELD.equals(key))
            _clientId=(String)value;
        else if (Bayeux.DATA_FIELD.equals(key))
            _data=value;
        return super.put(key,value);
    }

    /* ------------------------------------------------------------ */
    /* (non-Javadoc)
     * @see java.util.HashMap#putAll(java.util.Map)
     */
    public void putAll(Map<? extends String, ? extends Object> m)
    {
        _json=null;
        super.putAll(m);
        _channel=(String)get(Bayeux.CHANNEL_FIELD);
        Object id=get(Bayeux.ID_FIELD);
        _id=id==null?null:id.toString();
        _data=get(Bayeux.DATA_FIELD);
    }

    /* ------------------------------------------------------------ */
    /* (non-Javadoc)
     * @see java.util.HashMap#remove(java.lang.Object)
     */
    public Object remove(Object key)
    {
        _json=null;
        if (Bayeux.CHANNEL_FIELD.equals(key))
            _channel=null;
        else if (Bayeux.ID_FIELD.equals(key))
            _id=null;
        else if (Bayeux.DATA_FIELD.equals(key))
            _data=null;
        return super.remove(key);
    }

    /* ------------------------------------------------------------ */
    /* (non-Javadoc)
     * @see java.util.HashMap#entrySet()
     */
    public Set<java.util.Map.Entry entrySet()
    {
        return Collections.unmodifiableSet(super.entrySet());
    }

    /* ------------------------------------------------------------ */
    /* (non-Javadoc)
     * @see java.util.HashMap#keySet()
     */
    public Set<String> keySet()
    {
        return Collections.unmodifiableSet(super.keySet());
    }

    /* ------------------------------------------------------------ */
    public Message getAssociated()
    {
        return _associated;
    }

    /* ------------------------------------------------------------ */
    public void setAssociated(Message associated)
    {
        if (_associated!=associated)
        {
            if (_associated!=null)
                ((MessageImpl)_associated).decRef();
            _associated=associated;
            if (_associated!=null)
                ((MessageImpl)_associated).incRef();
        }
    }
    

}

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