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/*******************************************************************************
* Copyright (c) 2011, 2012 Wind River Systems, Inc. and others. All rights reserved.
* This program and the accompanying materials are made available under the terms
* of the Eclipse Public License v1.0 which accompanies this distribution, and is
* available at http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.tcf.locator.listener;
import org.eclipse.core.runtime.Assert;
import org.eclipse.tcf.protocol.IChannel;
import org.eclipse.tcf.protocol.IPeer;
import org.eclipse.tcf.protocol.Protocol;
import org.eclipse.tcf.te.tcf.core.listeners.interfaces.IChannelStateChangeListener;
import org.eclipse.tcf.te.tcf.locator.activator.CoreBundleActivator;
import org.eclipse.tcf.te.tcf.locator.interfaces.ITracing;
import org.eclipse.tcf.te.tcf.locator.interfaces.nodes.ILocatorModel;
import org.eclipse.tcf.te.tcf.locator.interfaces.nodes.IPeerModel;
import org.eclipse.tcf.te.tcf.locator.interfaces.nodes.IPeerModelProperties;
import org.eclipse.tcf.te.tcf.locator.interfaces.services.ILocatorModelLookupService;
/**
* Channel state change listener implementation.
*/
public class ChannelStateChangeListener implements IChannelStateChangeListener {
// Reference to the parent model
private final ILocatorModel model;
/**
* Constructor.
*
* @param model The parent locator model. Must not be <code>null</code>.
*/
public ChannelStateChangeListener(ILocatorModel model) {
Assert.isNotNull(model);
this.model = model;
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.tcf.tcf.core.interfaces.listeners.IChannelStateChangeListener#stateChanged(org.eclipse.tcf.protocol.IChannel, int)
*/
@Override
public void stateChanged(IChannel channel, int state) {
Assert.isNotNull(channel);
Assert.isTrue(Protocol.isDispatchThread());
if (CoreBundleActivator.getTraceHandler().isSlotEnabled(0, ITracing.ID_TRACE_CHANNEL_STATE_CHANGE_LISTENER)) {
CoreBundleActivator.getTraceHandler().trace("ChannelStateChangeListener.stateChanged( " + channel + ", " + (state == IChannel.STATE_OPEN ? "OPEN" : "CLOSED") + " )", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$
ITracing.ID_TRACE_CHANNEL_STATE_CHANGE_LISTENER, this);
}
switch (state) {
case IChannel.STATE_OPEN:
IPeer peer = channel.getRemotePeer();
if (peer != null && peer.getID() != null) {
// Find the corresponding model node
IPeerModel node = model.getService(ILocatorModelLookupService.class).lkupPeerModelById(peer.getID());
if (node != null) {
// Increase the channel reference counter by 1
int counter = node.getIntProperty(IPeerModelProperties.PROP_CHANNEL_REF_COUNTER);
if (counter < 0) counter = 0;
counter++;
node.setProperty(IPeerModelProperties.PROP_CHANNEL_REF_COUNTER, counter);
if (counter > 0) node.setProperty(IPeerModelProperties.PROP_STATE, IPeerModelProperties.STATE_CONNECTED);
}
}
break;
case IChannel.STATE_CLOSED:
peer = channel.getRemotePeer();
if (peer != null && peer.getID() != null) {
// Find the corresponding model node
IPeerModel node = model.getService(ILocatorModelLookupService.class).lkupPeerModelById(peer.getID());
if (node != null) {
// Decrease the channel reference counter by 1
int counter = node.getIntProperty(IPeerModelProperties.PROP_CHANNEL_REF_COUNTER);
counter--;
if (counter < 0) counter = 0;
node.setProperty(IPeerModelProperties.PROP_CHANNEL_REF_COUNTER, counter);
if (counter == 0 && node.isProperty(IPeerModelProperties.PROP_STATE, IPeerModelProperties.STATE_CONNECTED)) {
node.setProperty(IPeerModelProperties.PROP_STATE, IPeerModelProperties.STATE_REACHABLE);
}
}
}
break;
}
}
}
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