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/*******************************************************************************
* Copyright (c) 2012, 2013 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.services;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import org.eclipse.core.runtime.Assert;
import org.eclipse.tcf.protocol.IChannel;
import org.eclipse.tcf.protocol.Protocol;
import org.eclipse.tcf.te.runtime.interfaces.IConditionTester;
import org.eclipse.tcf.te.tcf.core.Tcf;
import org.eclipse.tcf.te.tcf.core.interfaces.IChannelManager;
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.ILocatorModelPeerNodeQueryService;
import org.eclipse.tcf.te.tcf.locator.interfaces.services.ILocatorModelUpdateService;
/**
* Default locator model peer node query service implementation.
*/
public class LocatorModelPeerNodeQueryService extends AbstractLocatorModelService implements ILocatorModelPeerNodeQueryService {
/**
* Constructor.
*
* @param parentModel The parent locator model instance. Must not be <code>null</code>.
*/
public LocatorModelPeerNodeQueryService(ILocatorModel parentModel) {
super(parentModel);
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.tcf.locator.interfaces.services.ILocatorModelPeerNodeQueryService#queryLocalServices(org.eclipse.tcf.te.tcf.locator.interfaces.nodes.IPeerModel)
*/
@Override
public String queryLocalServices(final IPeerModel node) {
Assert.isTrue(!Protocol.isDispatchThread(), "Illegal Thread Access"); //$NON-NLS-1$
Assert.isNotNull(node);
// Check if the services has been cached before
final AtomicReference<String> services = new AtomicReference<String>();
Protocol.invokeAndWait(new Runnable() {
@Override
public void run() {
services.set(node.getStringProperty(IPeerModelProperties.PROP_LOCAL_SERVICES));
}
});
if (services.get() != null && !"".equals(services.get())) { //$NON-NLS-1$
// Services are cached -> return immediately
return services.get();
}
// Get the service asynchronously and block the caller thread until
// the callback returned
final AtomicBoolean completed = new AtomicBoolean(false);
Protocol.invokeLater(new Runnable() {
@Override
public void run() {
queryServicesAsync(node, new DoneQueryServices() {
@Override
public void doneQueryServices(Throwable error) {
if (error == null) {
services.set(node.getStringProperty(IPeerModelProperties.PROP_LOCAL_SERVICES));
}
completed.set(true);
}
});
}
});
final long startTime = System.currentTimeMillis();
final IConditionTester tester = new IConditionTester() {
@Override
public boolean isConditionFulfilled() {
return completed.get();
}
@Override
public void cleanup() {}
};
while ((startTime + 1000) < System.currentTimeMillis() && !tester.isConditionFulfilled()) {
try {
Thread.sleep(100);
} catch (InterruptedException e) { /* ignored on purpose */ }
}
return services.get();
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.tcf.locator.interfaces.services.ILocatorModelPeerNodeQueryService#queryRemoteServices(org.eclipse.tcf.te.tcf.locator.interfaces.nodes.IPeerModel)
*/
@Override
public String queryRemoteServices(final IPeerModel node) {
Assert.isTrue(!Protocol.isDispatchThread(), "Illegal Thread Access"); //$NON-NLS-1$
Assert.isNotNull(node);
// Check if the services has been cached before
final AtomicReference<String> services = new AtomicReference<String>();
Protocol.invokeAndWait(new Runnable() {
@Override
public void run() {
services.set(node.getStringProperty(IPeerModelProperties.PROP_REMOTE_SERVICES));
}
});
if (services.get() != null && !"".equals(services.get())) { //$NON-NLS-1$
// Services are cached -> return immediately
return services.get();
}
// Get the service asynchronously and block the caller thread until
// the callback returned
final AtomicBoolean completed = new AtomicBoolean(false);
Protocol.invokeLater(new Runnable() {
@Override
public void run() {
queryServicesAsync(node, new DoneQueryServices() {
@Override
public void doneQueryServices(Throwable error) {
if (error == null) {
services.set(node.getStringProperty(IPeerModelProperties.PROP_REMOTE_SERVICES));
}
completed.set(true);
}
});
}
});
final long startTime = System.currentTimeMillis();
final IConditionTester tester = new IConditionTester() {
@Override
public boolean isConditionFulfilled() {
return completed.get();
}
@Override
public void cleanup() {}
};
while ((startTime + 1000) < System.currentTimeMillis() && !tester.isConditionFulfilled()) {
try {
Thread.sleep(100);
} catch (InterruptedException e) { /* ignored on purpose */ }
}
return services.get();
}
/* default */ final Map<IPeerModel, List<DoneQueryServices>> serviceQueriesInProgress = new HashMap<IPeerModel, List<DoneQueryServices>>();
/* (non-Javadoc)
* @see org.eclipse.tcf.te.tcf.locator.interfaces.services.ILocatorModelPeerNodeQueryService#queryServicesAsync(org.eclipse.tcf.te.tcf.locator.interfaces.nodes.IPeerModel, org.eclipse.tcf.te.tcf.locator.interfaces.services.ILocatorModelPeerNodeQueryService.DoneQueryServices)
*/
@Override
public void queryServicesAsync(final IPeerModel node, final DoneQueryServices done) {
Assert.isTrue(Protocol.isDispatchThread(), "Illegal Thread Access"); //$NON-NLS-1$
Assert.isNotNull(node);
Assert.isNotNull(done);
// If a service query for the same peer is already in progress,
// attach the new done to the list to call and drop out
if (serviceQueriesInProgress.containsKey(node)) {
List<DoneQueryServices> dones = serviceQueriesInProgress.get(node);
Assert.isNotNull(dones);
dones.add(done);
return;
}
// Add the done callback to a list of waiting callbacks per peer node
List<DoneQueryServices> dones = new ArrayList<DoneQueryServices>();
dones.add(done);
serviceQueriesInProgress.put(node, dones);
// Create the inner callback that invokes the queued outer callbacks
final DoneQueryServices innerDone = new DoneQueryServices() {
@Override
public void doneQueryServices(Throwable error) {
// Get the list of the original done callbacks
List<DoneQueryServices> dones = serviceQueriesInProgress.remove(node);
if (dones != null) {
for (DoneQueryServices done : dones) {
done.doneQueryServices(error);
}
}
}
};
// Do not try to open a channel to peers known to be unreachable
int state = node.getIntProperty(IPeerModelProperties.PROP_STATE);
if (state == IPeerModelProperties.STATE_ERROR || state == IPeerModelProperties.STATE_NOT_REACHABLE || !node.isComplete()) {
innerDone.doneQueryServices(null);
return;
}
// Opens a channel with the full value-add chain
Map<String, Boolean> flags = new HashMap<String, Boolean>();
flags.put(IChannelManager.FLAG_NO_PATH_MAP, Boolean.TRUE);
Tcf.getChannelManager().openChannel(node.getPeer(), flags, new IChannelManager.DoneOpenChannel() {
@Override
public void doneOpenChannel(Throwable error, IChannel channel) {
// If the channel opening failed -> return immediately
if (error != null) {
innerDone.doneQueryServices(error);
} else {
// Get the local service
List<String> localServices = new ArrayList<String>(channel.getLocalServices());
// Get the remote services
List<String> remoteServices = new ArrayList<String>(channel.getRemoteServices());
// Close the channel
Tcf.getChannelManager().closeChannel(channel);
// Sort the service lists
Collections.sort(localServices);
Collections.sort(remoteServices);
// Update the services
ILocatorModelUpdateService updateService = node.getModel().getService(ILocatorModelUpdateService.class);
updateService.updatePeerServices(node, localServices, remoteServices);
// Invoke the callback
innerDone.doneQueryServices(null);
}
}
});
}
}
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