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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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33 | 0 | protected boolean cacheMessages = false; |
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35 | 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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{ |
45 | 0 | super(endpoint); |
46 | 0 | cacheMessages = MapUtils.getBoolean(endpoint.getProperties(), "cacheMessages", false); |
47 | 0 | messageCacheSize = MapUtils.getInteger(endpoint.getProperties(), "messageCacheSize", 500); |
48 | 0 | channel = endpoint.getEndpointURI().getPath(); |
49 | 0 | if(StringUtils.isEmpty(channel) || channel.equals("/")) |
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{ |
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52 | 0 | throw new CreateException(AjaxMessages.createStaticMessage("The subscription path cannot be empty or equal '/'"), this); |
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} |
54 | 0 | } |
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public AbstractBayeux getBayeux() |
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{ |
58 | 0 | return bayeux; |
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} |
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public void setBayeux(AbstractBayeux bayeux) |
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{ |
63 | 0 | this.bayeux = bayeux; |
64 | 0 | } |
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@Override |
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protected void doInitialise() throws InitialisationException |
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{ |
69 | 0 | if (cacheMessages) |
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{ |
71 | 0 | messageCache = new BoundedFifoBuffer(messageCacheSize); |
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} |
73 | 0 | } |
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protected Client getClient() |
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{ |
77 | 0 | if(client == null) |
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{ |
79 | 0 | client = bayeux.newClient(channel); |
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} |
81 | 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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|
87 | 0 | if(NullPayload.getInstance().equals(event.getMessage().getPayload())) |
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{ |
89 | 0 | return; |
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} |
91 | 0 | if (!connector.isStarted()) |
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{ |
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|
94 | 0 | logger.warn("Servlet container has not yet initialised, ignoring event: " + event.getMessage().getPayload()); |
95 | 0 | return; |
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} |
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|
98 | 0 | Channel chan = bayeux.getChannel(channel); |
99 | 0 | if(chan!=null) |
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{ |
101 | 0 | if (chan.getSubscribers().size() > 0 && cacheMessages && !messageCache.isEmpty()) |
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{ |
103 | 0 | while (!messageCache.isEmpty()) |
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{ |
105 | 0 | for (Client client : chan.getSubscribers()) |
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{ |
107 | 0 | deliver(client, channel, messageCache.remove()); |
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} |
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} |
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} |
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113 | 0 | Object data = event.getMessage().getPayload(); |
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115 | 0 | for (Client client : chan.getSubscribers()) |
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{ |
117 | 0 | deliver(client, channel, data); |
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} |
119 | 0 | } |
120 | 0 | else if (cacheMessages) |
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{ |
122 | 0 | Object data = event.getMessage().getPayload(); |
123 | 0 | if (logger.isTraceEnabled()) |
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{ |
125 | 0 | logger.trace("There are no clients waiting, adding message to cache: " + data); |
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} |
127 | 0 | messageCache.add(data); |
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} |
129 | 0 | } |
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protected void deliver(Client client, String channel, Object data) |
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{ |
133 | 0 | if (logger.isTraceEnabled()) |
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{ |
135 | 0 | logger.trace("Delivering to client id: " + client.getId() + " channel:" + channel); |
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} |
137 | 0 | client.deliver(client, channel, data, null); |
138 | 0 | } |
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protected MuleMessage doSend(MuleEvent event) throws Exception |
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{ |
142 | 0 | doDispatch(event); |
143 | 0 | return null; |
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} |
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@Override |
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protected void doDispose() |
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{ |
149 | 0 | if (messageCache != null) |
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{ |
151 | 0 | messageCache.clear(); |
152 | 0 | messageCache = null; |
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} |
154 | 0 | } |
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} |