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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 java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
import org.eclipse.core.runtime.Assert;
import org.eclipse.tcf.core.AbstractPeer;
import org.eclipse.tcf.protocol.IPeer;
import org.eclipse.tcf.protocol.Protocol;
import org.eclipse.tcf.services.ILocator;
import org.eclipse.tcf.te.tcf.core.peers.Peer;
import org.eclipse.tcf.te.tcf.locator.ScannerRunnable;
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;
import org.eclipse.tcf.te.tcf.locator.interfaces.services.ILocatorModelRefreshService;
import org.eclipse.tcf.te.tcf.locator.interfaces.services.ILocatorModelUpdateService;
import org.eclipse.tcf.te.tcf.locator.nodes.PeerModel;
import org.eclipse.tcf.te.tcf.locator.nodes.PeerRedirector;
/**
* Locator listener implementation.
*/
public class LocatorListener implements ILocator.LocatorListener {
// Reference to the parent model
private final ILocatorModel model;
/**
* Constructor.
*
* @param model The parent locator model. Must not be <code>null</code>.
*/
public LocatorListener(ILocatorModel model) {
super();
Assert.isNotNull(model);
this.model = model;
}
/* (non-Javadoc)
* @see org.eclipse.tcf.services.ILocator.LocatorListener#peerAdded(org.eclipse.tcf.protocol.IPeer)
*/
@Override
public void peerAdded(IPeer peer) {
if (CoreBundleActivator.getTraceHandler().isSlotEnabled(0, ITracing.ID_TRACE_LOCATOR_LISTENER)) {
CoreBundleActivator.getTraceHandler().trace("LocatorListener.peerAdded( " + (peer != null ? peer.getID() : null) + " )", ITracing.ID_TRACE_LOCATOR_LISTENER, this); //$NON-NLS-1$ //$NON-NLS-2$
}
if (model != null && peer != null) {
// find the corresponding model node to remove (expected to be null)
IPeerModel peerNode = model.getService(ILocatorModelLookupService.class).lkupPeerModelById(peer.getID());
if (peerNode == null) {
// Double check with "ClientID" if set
String clientID = peer.getAttributes().get("ClientID"); //$NON-NLS-1$
if (clientID != null) {
peerNode = model.getService(ILocatorModelLookupService.class).lkupPeerModelById(clientID);
}
}
// If not found, create a new peer node instance
if (peerNode == null) {
peerNode = new PeerModel(model, peer);
// Validate the peer node before adding
peerNode = model.validatePeerNodeForAdd(peerNode);
// Add the peer node to the model
if (peerNode != null) {
model.getService(ILocatorModelUpdateService.class).add(peerNode);
// And schedule for immediate status update
Runnable runnable = new ScannerRunnable(model.getScanner(), peerNode);
Protocol.invokeLater(runnable);
}
} else {
// Peer node found, update the peer instance
String value = peerNode.getPeer().getAttributes().get("static.transient"); //$NON-NLS-1$
boolean isStatic = value != null && Boolean.parseBoolean(value.trim());
if (isStatic) {
// Validate the peer node before updating
IPeer myPeer = model.validatePeer(peer);
if (myPeer != null) {
boolean changed = peerNode.setChangeEventsEnabled(false);
// Merge user configured properties between the peers
model.getService(ILocatorModelUpdateService.class).mergeUserDefinedAttributes(peerNode, myPeer, true);
if (changed) peerNode.setChangeEventsEnabled(true);
peerNode.fireChangeEvent(IPeerModelProperties.PROP_INSTANCE, myPeer, peerNode.getPeer());
}
} else {
peerNode.setProperty(IPeerModelProperties.PROP_INSTANCE, peer);
}
}
}
}
// Map of guardian objects per peer
private final Map<IPeer, AtomicBoolean> PEER_CHANGED_GUARDIANS = new HashMap<IPeer, AtomicBoolean>();
/* (non-Javadoc)
* @see org.eclipse.tcf.services.ILocator.LocatorListener#peerChanged(org.eclipse.tcf.protocol.IPeer)
*/
@Override
public void peerChanged(IPeer peer) {
// Protect ourself from reentrant calls while processing a changed peer.
if (peer != null) {
AtomicBoolean guard = PEER_CHANGED_GUARDIANS.get(peer);
if (guard != null && guard.get()) return;
if (guard != null) guard.set(true);
else PEER_CHANGED_GUARDIANS.put(peer, new AtomicBoolean(true));
}
if (CoreBundleActivator.getTraceHandler().isSlotEnabled(0, ITracing.ID_TRACE_LOCATOR_LISTENER)) {
CoreBundleActivator.getTraceHandler().trace("LocatorListener.peerChanged( " + (peer != null ? peer.getID() : null) + " )", ITracing.ID_TRACE_LOCATOR_LISTENER, this); //$NON-NLS-1$ //$NON-NLS-2$
}
if (model != null && peer != null) {
// find the corresponding model node to remove
IPeerModel peerNode = model.getService(ILocatorModelLookupService.class).lkupPeerModelById(peer.getID());
if (peerNode == null) {
// Double check with "ClientID" if set
String clientID = peer.getAttributes().get("ClientID"); //$NON-NLS-1$
if (clientID != null) {
peerNode = model.getService(ILocatorModelLookupService.class).lkupPeerModelById(clientID);
}
}
// Update the peer instance
if (peerNode != null) {
// Get the old peer instance
IPeer oldPeer = peerNode.getPeer();
// If old peer and new peer instance are the same _objects_, nothing to do
if (oldPeer != peer) {
// Peers visible to the locator are replaced with the new instance
if (oldPeer instanceof AbstractPeer) {
peerNode.setProperty(IPeerModelProperties.PROP_INSTANCE, peer);
}
// Non-visible peers are updated
else {
// Validate the peer node before updating
IPeer myPeer = model.validatePeer(peer);
if (myPeer != null) {
boolean changed = peerNode.setChangeEventsEnabled(false);
// Merge user configured properties between the peers
model.getService(ILocatorModelUpdateService.class).mergeUserDefinedAttributes(peerNode, myPeer, true);
if (changed) peerNode.setChangeEventsEnabled(true);
peerNode.fireChangeEvent(IPeerModelProperties.PROP_INSTANCE, myPeer, peerNode.getPeer());
}
}
}
}
// Refresh static peers and merge attributes if required
model.getService(ILocatorModelRefreshService.class).refreshStaticPeers();
}
// Clean up the guardians
if (peer != null) PEER_CHANGED_GUARDIANS.remove(peer);
}
/* (non-Javadoc)
* @see org.eclipse.tcf.services.ILocator.LocatorListener#peerRemoved(java.lang.String)
*/
@Override
public void peerRemoved(String id) {
if (CoreBundleActivator.getTraceHandler().isSlotEnabled(0, ITracing.ID_TRACE_LOCATOR_LISTENER)) {
CoreBundleActivator.getTraceHandler().trace("LocatorListener.peerRemoved( " + id + " )", ITracing.ID_TRACE_LOCATOR_LISTENER, this); //$NON-NLS-1$ //$NON-NLS-2$
}
if (model != null && id != null) {
// find the corresponding model node to remove
IPeerModel peerNode = model.getService(ILocatorModelLookupService.class).lkupPeerModelById(id);
if (peerNode != null) {
IPeer peer = peerNode.getPeer();
String value = peer.getAttributes().get("static.transient"); //$NON-NLS-1$
boolean isStatic = value != null && Boolean.parseBoolean(value.trim());
if (isStatic) {
boolean changed = peerNode.setChangeEventsEnabled(false);
// Create a modifiable copy of the peer attributes
Map<String, String> attrs = new HashMap<String, String>(peerNode.getPeer().getAttributes());
// Remember the remote peer id before removing it
String remotePeerID = attrs.get("remote.id.transient"); //$NON-NLS-1$
// Remove all merged attributes from the peer instance
String merged = attrs.remove("remote.merged.transient"); //$NON-NLS-1$
if (merged != null) {
merged = merged.replace('[', ' ').replace(']', ' ').trim();
List<String> keysToRemove = Arrays.asList(merged.split(",\\ ")); //$NON-NLS-1$
String[] keys = attrs.keySet().toArray(new String[attrs.keySet().size()]);
for (String key : keys) {
if (keysToRemove.contains(key)) {
attrs.remove(key);
}
}
// Make sure the ID is set correctly
if (attrs.get(IPeer.ATTR_ID) == null) {
attrs.put(IPeer.ATTR_ID, peer.getID());
}
// Update the peer attributes
if (peer instanceof PeerRedirector) {
((PeerRedirector)peer).updateAttributes(attrs);
} else if (peer instanceof Peer) {
((Peer)peer).updateAttributes(attrs);
}
}
// Remove the attributes stored at peer node level
peerNode.setProperty(IPeerModelProperties.PROP_LOCAL_SERVICES, null);
peerNode.setProperty(IPeerModelProperties.PROP_REMOTE_SERVICES, null);
// Check if we have to remote the peer in the underlying locator service too
if (remotePeerID != null) {
Map<String, IPeer> peers = Protocol.getLocator().getPeers();
IPeer remotePeer = peers.get(remotePeerID);
if (remotePeer instanceof AbstractPeer) ((AbstractPeer)remotePeer).dispose();
}
if (changed) peerNode.setChangeEventsEnabled(true);
peerNode.fireChangeEvent(IPeerModelProperties.PROP_INSTANCE, peer, peerNode.getPeer());
} else {
// Dynamic peer -> Remove peer model node from the model
model.getService(ILocatorModelUpdateService.class).remove(peerNode);
}
}
}
}
/* (non-Javadoc)
* @see org.eclipse.tcf.services.ILocator.LocatorListener#peerHeartBeat(java.lang.String)
*/
@Override
public void peerHeartBeat(String id) {
if (CoreBundleActivator.getTraceHandler().isSlotEnabled(0, ITracing.ID_TRACE_LOCATOR_LISTENER)) {
CoreBundleActivator.getTraceHandler().trace("LocatorListener.peerHeartBeat( " + id + " )", ITracing.ID_TRACE_LOCATOR_LISTENER, this); //$NON-NLS-1$ //$NON-NLS-2$
}
}
}
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