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Support for Comet and Websocket endpoints
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/*
* Fabric3
* Copyright (c) 2009-2011 Metaform Systems
*
* Fabric3 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version, with the
* following exception:
*
* Linking this software statically or dynamically with other
* modules is making a combined work based on this software.
* Thus, the terms and conditions of the GNU General Public
* License cover the whole combination.
*
* As a special exception, the copyright holders of this software
* give you permission to link this software with independent
* modules to produce an executable, regardless of the license
* terms of these independent modules, and to copy and distribute
* the resulting executable under terms of your choice, provided
* that you also meet, for each linked independent module, the
* terms and conditions of the license of that module. An
* independent module is a module which is not derived from or
* based on this software. If you modify this software, you may
* extend this exception to your version of the software, but
* you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version.
*
* Fabric3 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the
* GNU General Public License along with Fabric3.
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*/
package org.fabric3.binding.web.runtime.channel;

import java.net.URI;

import org.osoa.sca.annotations.EagerInit;
import org.osoa.sca.annotations.Reference;

import org.fabric3.api.annotation.monitor.Monitor;
import org.fabric3.binding.web.provision.WebConnectionSourceDefinition;
import org.fabric3.binding.web.runtime.common.BroadcasterManager;
import org.fabric3.spi.builder.component.ConnectionAttachException;
import org.fabric3.spi.builder.component.SourceConnectionAttacher;
import org.fabric3.spi.channel.Channel;
import org.fabric3.spi.channel.ChannelConnection;
import org.fabric3.spi.channel.ChannelManager;
import org.fabric3.spi.host.ServletHost;
import org.fabric3.spi.model.physical.PhysicalConnectionTargetDefinition;

/**
 * Attaches a consumer to a channel configured with the web binding. The connection to the channel is local since the web binding does not provide
 * native multicast. Instead, a channel is connected to a web socket or comet connection and multiplexes events using local handlers.
 *
 * @version $Rev: 9763 $ $Date: 2011-01-03 00:48:06 +0000 (Mon, 03 Jan 2011) $
 */
@EagerInit
public class WebSourceConnectionAttacher implements SourceConnectionAttacher {
    private ChannelManager channelManager;

    public WebSourceConnectionAttacher(@Reference ChannelManager channelManager,
                                       @Reference BroadcasterManager broadcasterManager,
                                       @Reference PubSubManager pubSubManager,
                                       @Reference ServletHost servletHost,
                                       @Monitor ChannelMonitor monitor) {
        this.channelManager = channelManager;
    }

    public void attach(WebConnectionSourceDefinition source, PhysicalConnectionTargetDefinition target, ChannelConnection connection)
            throws ConnectionAttachException {
        URI sourceUri = source.getUri();
        URI channelUri = source.getChannelUri();
        Channel channel = getChannel(channelUri);
        channel.subscribe(sourceUri, connection);
    }

    public void detach(WebConnectionSourceDefinition source, PhysicalConnectionTargetDefinition target) throws ConnectionAttachException {
        URI sourceUri = source.getUri();
        URI channelUri = source.getChannelUri();
        Channel channel = getChannel(channelUri);
        channel.unsubscribe(sourceUri);
    }

    private Channel getChannel(URI sourceUri) throws ChannelNotFoundException {
        Channel channel = channelManager.getChannel(sourceUri);
        if (channel == null) {
            throw new ChannelNotFoundException("Channel not found: " + sourceUri);
        }
        return channel;
    }

}