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package org.mule.transport.ajax; |
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import org.mule.api.MuleEvent; |
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import org.mule.api.MuleMessage; |
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import org.mule.api.endpoint.OutboundEndpoint; |
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import org.mule.api.lifecycle.CreateException; |
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import org.mule.api.lifecycle.InitialisationException; |
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import org.mule.transport.AbstractMessageDispatcher; |
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import org.mule.transport.NullPayload; |
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import org.mule.transport.ajax.i18n.AjaxMessages; |
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import org.mule.util.MapUtils; |
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import org.mule.util.StringUtils; |
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import org.apache.commons.collections.Buffer; |
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import org.apache.commons.collections.buffer.BoundedFifoBuffer; |
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import org.cometd.Channel; |
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import org.cometd.Client; |
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import org.mortbay.cometd.AbstractBayeux; |
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public class AjaxMessageDispatcher extends AbstractMessageDispatcher implements BayeuxAware |
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{ |
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protected AbstractBayeux bayeux; |
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36 | 0 | protected boolean cacheMessages = false; |
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38 | 0 | protected int messageCacheSize = 500; |
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protected Buffer messageCache; |
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protected String channel; |
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protected Client client; |
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public AjaxMessageDispatcher(OutboundEndpoint endpoint) throws CreateException |
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{ |
48 | 0 | super(endpoint); |
49 | 0 | cacheMessages = MapUtils.getBoolean(endpoint.getProperties(), "cacheMessages", false); |
50 | 0 | messageCacheSize = MapUtils.getInteger(endpoint.getProperties(), "messageCacheSize", 500); |
51 | 0 | channel = endpoint.getEndpointURI().getPath(); |
52 | 0 | if(StringUtils.isEmpty(channel) || channel.equals("/")) |
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{ |
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|
55 | 0 | throw new CreateException(AjaxMessages.createStaticMessage("The subscription path cannot be empty or equal '/'"), this); |
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} |
57 | 0 | } |
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public AbstractBayeux getBayeux() |
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{ |
61 | 0 | return bayeux; |
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} |
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public void setBayeux(AbstractBayeux bayeux) |
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{ |
66 | 0 | this.bayeux = bayeux; |
67 | 0 | } |
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@Override |
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protected void doInitialise() throws InitialisationException |
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{ |
72 | 0 | if (cacheMessages) |
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{ |
74 | 0 | messageCache = new BoundedFifoBuffer(messageCacheSize); |
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} |
76 | 0 | } |
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protected Client getClient() |
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{ |
80 | 0 | if(client == null) |
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{ |
82 | 0 | client = bayeux.newClient(channel); |
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} |
84 | 0 | return client; |
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} |
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protected void doDispatch(MuleEvent event) throws Exception |
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{ |
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|
90 | 0 | if(NullPayload.getInstance().equals(event.getMessage().getPayload())) |
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{ |
92 | 0 | return; |
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} |
94 | 0 | if (!connector.isStarted()) |
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{ |
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|
97 | 0 | logger.warn("Servlet container has not yet initialised, ignoring event: " + event.getMessage().getPayload()); |
98 | 0 | return; |
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} |
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|
101 | 0 | Channel chan = bayeux.getChannel(channel); |
102 | 0 | if(chan!=null) |
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{ |
104 | 0 | if (chan.getSubscribers().size() > 0 && cacheMessages && !messageCache.isEmpty()) |
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{ |
106 | 0 | while (!messageCache.isEmpty()) |
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{ |
108 | 0 | for (Client client : chan.getSubscribers()) |
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{ |
110 | 0 | deliver(client, channel, messageCache.remove()); |
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} |
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} |
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} |
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|
116 | 0 | Object data = event.getMessage().getPayload(); |
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|
118 | 0 | for (Client client : chan.getSubscribers()) |
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{ |
120 | 0 | deliver(client, channel, data); |
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} |
122 | 0 | } |
123 | 0 | else if (cacheMessages) |
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{ |
125 | 0 | Object data = event.getMessage().getPayload(); |
126 | 0 | if (logger.isTraceEnabled()) |
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{ |
128 | 0 | logger.trace("There are no clients waiting, adding message to cache: " + data); |
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} |
130 | 0 | messageCache.add(data); |
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} |
132 | 0 | } |
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protected void deliver(Client client, String channel, Object data) |
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{ |
136 | 0 | if (logger.isTraceEnabled()) |
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{ |
138 | 0 | logger.trace("Delivering to client id: " + client.getId() + " channel:" + channel); |
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} |
140 | 0 | client.deliver(client, channel, data, null); |
141 | 0 | } |
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protected MuleMessage doSend(MuleEvent event) throws Exception |
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{ |
145 | 0 | doDispatch(event); |
146 | 0 | return null; |
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} |
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@Override |
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protected void doDispose() |
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{ |
152 | 0 | if (messageCache != null) |
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{ |
154 | 0 | messageCache.clear(); |
155 | 0 | messageCache = null; |
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} |
157 | 0 | } |
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} |