| /******************************************************************************* |
| * Copyright (c) 2011, 2015 VMware 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: |
| * 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.bundle.EventHook; |
| |
| /** |
| * {@link RegionBundleEventHook} manages the visibility of bundle events across regions according to the |
| * {@link RegionDigraph}. |
| * <p> |
| * The current implementation delegates to {@link RegionBundleFindHook}. This is likely to perform adequately because of |
| * the low frequency of bundle events and the typically small number of bundle listeners. |
| * <p /> |
| * |
| * <strong>Concurrent Semantics</strong><br /> |
| * Thread safe. |
| */ |
| public final class RegionBundleEventHook implements EventHook { |
| |
| private final RegionDigraph regionDigraph; |
| |
| private final ThreadLocal<Region> threadLocal; |
| |
| private final long hookImplID; |
| |
| public RegionBundleEventHook(RegionDigraph regionDigraph, ThreadLocal<Region> threadLocal, long hookImplID) { |
| this.regionDigraph = regionDigraph; |
| this.threadLocal = threadLocal; |
| this.hookImplID = hookImplID; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void event(BundleEvent event, Collection<BundleContext> contexts) { |
| Bundle eventBundle = event.getBundle(); |
| if (event.getType() == BundleEvent.INSTALLED) { |
| bundleInstalled(eventBundle, event.getOrigin()); |
| } |
| 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; |
| } |
| |
| long bundleID = bundle.getBundleId(); |
| if (bundleID == 0 || bundleID == hookImplID) { |
| // The system bundle and the hook impl bundle can see all bundles |
| 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, eventBundle); |
| regionAccess.put(region, accessible); |
| } |
| if (!accessible) { |
| i.remove(); |
| } |
| } |
| } |
| if (event.getType() == BundleEvent.UNINSTALLED) { |
| bundleUninstalled(eventBundle); |
| } |
| } |
| |
| private boolean isAccessible(Region region, Bundle candidateBundle) { |
| Collection<Bundle> candidates = new ArrayList<Bundle>(1); |
| candidates.add(candidateBundle); |
| RegionBundleFindHook.find(region, candidates); |
| return !candidates.isEmpty(); |
| } |
| |
| private void bundleInstalled(Bundle eventBundle, Bundle originBundle) { |
| /* |
| * BundleIdBasedRegion sets thread local to install bundles into arbitrary regions. If this is not set, the |
| * bundle inherits the region of the origin bundle. |
| */ |
| Region installRegion = this.threadLocal.get(); |
| if (installRegion != null) { |
| addBundleToRegion(eventBundle, installRegion); |
| } else { |
| Region defaultAssignRegion = this.regionDigraph.getDefaultRegion(); |
| if (defaultAssignRegion != null) { |
| addBundleToRegion(eventBundle, defaultAssignRegion); |
| } else { |
| Region originRegion = this.regionDigraph.getRegion(originBundle); |
| if (originRegion != null) { |
| addBundleToRegion(eventBundle, originRegion); |
| } |
| } |
| } |
| } |
| |
| private void addBundleToRegion(Bundle eventBundle, Region region) { |
| try { |
| region.addBundle(eventBundle); |
| } catch (BundleException e) { |
| e.printStackTrace(); |
| throw new RuntimeException("Bundle could not be added to region", e); //$NON-NLS-1$ |
| } |
| } |
| |
| private void bundleUninstalled(Bundle eventBundle) { |
| Region region = this.regionDigraph.getRegion(eventBundle); |
| if (region != null) { |
| region.removeBundle(eventBundle); |
| } |
| } |
| |
| } |