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/*******************************************************************************
* Copyright (c) 2011, 2015 VMware Inc.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* VMware Inc. - initial contribution
*******************************************************************************/
package org.eclipse.equinox.internal.region.hook;
import java.util.*;
import org.eclipse.equinox.region.Region;
import org.eclipse.equinox.region.RegionDigraph;
import org.osgi.framework.*;
import org.osgi.framework.hooks.service.EventHook;
/**
* {@link RegionServiceEventHook} manages the visibility of service events across regions according to the
* {@link RegionDigraph}.
* <p>
* The current implementation avoids traversing the graph multiple times from the same region.
* This is necessary to optimize the case where many bundles with service listeners
* are contained in the same region.
* <p />
*
* <strong>Concurrent Semantics</strong><br />
* Thread safe.
*/
@SuppressWarnings("deprecation")
public final class RegionServiceEventHook implements EventHook {
private final RegionDigraph regionDigraph;
public RegionServiceEventHook(RegionDigraph regionDigraph) {
this.regionDigraph = regionDigraph;
}
/**
* {@inheritDoc}
*/
public void event(ServiceEvent event, Collection<BundleContext> contexts) {
ServiceReference<?> eventService = event.getServiceReference();
Map<Region, Boolean> regionAccess = new HashMap<Region, Boolean>();
Iterator<BundleContext> i = contexts.iterator();
while (i.hasNext()) {
Bundle bundle = RegionBundleFindHook.getBundle(i.next());
if (bundle == null) {
// no bundle for context remove access from it
i.remove();
continue;
}
if (bundle.getBundleId() == 0L) {
// let system bundle see all
continue;
}
Region region = regionDigraph.getRegion(bundle);
if (region == null) {
// no region for context remove access from it
i.remove();
} else {
Boolean accessible = regionAccess.get(region);
if (accessible == null) {
// we have not checked this region's access do it now
accessible = isAccessible(region, eventService);
regionAccess.put(region, accessible);
}
if (!accessible) {
i.remove();
}
}
}
}
private Boolean isAccessible(Region region, ServiceReference<?> candidateServiceReference) {
Collection<ServiceReference<?>> candidates = new ArrayList<ServiceReference<?>>(1);
candidates.add(candidateServiceReference);
RegionServiceFindHook.find(region, candidates);
return !candidates.isEmpty();
}
}
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