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/*******************************************************************************
* Copyright (c) 2010, 2012 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.framework.internal.core;
import java.util.*;
import org.eclipse.osgi.framework.debug.Debug;
import org.eclipse.osgi.internal.serviceregistry.*;
import org.eclipse.osgi.service.resolver.ResolverHookException;
import org.eclipse.osgi.util.NLS;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.hooks.resolver.ResolverHook;
import org.osgi.framework.hooks.resolver.ResolverHookFactory;
import org.osgi.framework.wiring.*;
/**
* This class encapsulates the delegation to ResolverHooks that are registered with the service
* registry. This way the resolver implementation only has to call out to a single hook
* which does all the necessary service registry lookups.
*
* This class is not thread safe and expects external synchronization.
*
*/
public class CoreResolverHookFactory implements ResolverHookFactory {
// need a tuple to hold the service reference and hook object
// do not use a map for performance reasons; no need to hash based on a key.
static class HookReference {
public HookReference(ServiceReferenceImpl<ResolverHookFactory> reference, ResolverHook hook) {
this.reference = reference;
this.hook = hook;
}
final ServiceReferenceImpl<ResolverHookFactory> reference;
final ResolverHook hook;
}
private final BundleContextImpl context;
private final ServiceRegistry registry;
public CoreResolverHookFactory(BundleContextImpl context, ServiceRegistry registry) {
this.context = context;
this.registry = registry;
}
void handleHookException(Throwable t, Object hook, String method) {
if (Debug.DEBUG_HOOKS) {
Debug.println(hook.getClass().getName() + "." + method + "() exception:"); //$NON-NLS-1$ //$NON-NLS-2$
if (t != null)
Debug.printStackTrace(t);
}
String message = NLS.bind(Msg.SERVICE_FACTORY_EXCEPTION, hook.getClass().getName(), method);
throw new ResolverHookException(message, t);
}
private ServiceReferenceImpl<ResolverHookFactory>[] getHookReferences() {
try {
@SuppressWarnings("unchecked")
ServiceReferenceImpl<ResolverHookFactory>[] result = (ServiceReferenceImpl<ResolverHookFactory>[]) registry.getServiceReferences(context, ResolverHookFactory.class.getName(), null, false, false);
return result;
} catch (InvalidSyntaxException e) {
// cannot happen; no filter
return null;
}
}
public ResolverHook begin(Collection<BundleRevision> triggers) {
if (Debug.DEBUG_HOOKS) {
Debug.println("ResolverHook.begin"); //$NON-NLS-1$
}
ServiceReferenceImpl<ResolverHookFactory>[] refs = getHookReferences();
@SuppressWarnings("unchecked")
List<HookReference> hookRefs = refs == null ? Collections.EMPTY_LIST : new ArrayList<CoreResolverHookFactory.HookReference>(refs.length);
if (refs != null)
for (ServiceReferenceImpl<ResolverHookFactory> hookRef : refs) {
ResolverHookFactory factory = context.getService(hookRef);
if (factory != null) {
try {
ResolverHook hook = factory.begin(triggers);
if (hook != null)
hookRefs.add(new HookReference(hookRef, hook));
} catch (Throwable t) {
// need to force an end call on the ResolverHooks we got and release them
try {
new CoreResolverHook(hookRefs).end();
} catch (Throwable endError) {
// we are already in failure mode; just continue
}
handleHookException(t, factory, "begin"); //$NON-NLS-1$
}
}
}
return new CoreResolverHook(hookRefs);
}
void releaseHooks(List<HookReference> hookRefs) {
for (HookReference hookRef : hookRefs)
context.ungetService(hookRef.reference);
hookRefs.clear();
}
class CoreResolverHook implements ResolverHook {
private final List<HookReference> hooks;
CoreResolverHook(List<HookReference> hooks) {
this.hooks = hooks;
}
public void filterResolvable(Collection<BundleRevision> candidates) {
if (Debug.DEBUG_HOOKS) {
Debug.println("ResolverHook.filterResolvable(" + candidates + ")"); //$NON-NLS-1$ //$NON-NLS-2$
}
if (hooks.isEmpty())
return;
candidates = new ShrinkableCollection<BundleRevision>(candidates);
for (Iterator<HookReference> iHooks = hooks.iterator(); iHooks.hasNext();) {
HookReference hookRef = iHooks.next();
if (hookRef.reference.getBundle() == null) {
handleHookException(null, hookRef.hook, "filterResolvable"); //$NON-NLS-1$
} else {
try {
hookRef.hook.filterResolvable(candidates);
} catch (Throwable t) {
handleHookException(t, hookRef.hook, "filterResolvable"); //$NON-NLS-1$
}
}
}
}
public void filterSingletonCollisions(BundleCapability singleton, Collection<BundleCapability> collisionCandidates) {
if (Debug.DEBUG_HOOKS) {
Debug.println("ResolverHook.filterSingletonCollisions(" + singleton + ", " + collisionCandidates + ")"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
if (hooks.isEmpty())
return;
collisionCandidates = new ShrinkableCollection<BundleCapability>(collisionCandidates);
for (Iterator<HookReference> iHooks = hooks.iterator(); iHooks.hasNext();) {
HookReference hookRef = iHooks.next();
if (hookRef.reference.getBundle() == null) {
handleHookException(null, hookRef.hook, "filterSingletonCollisions"); //$NON-NLS-1$
} else {
try {
hookRef.hook.filterSingletonCollisions(singleton, collisionCandidates);
} catch (Throwable t) {
handleHookException(t, hookRef.hook, "filterSingletonCollisions"); //$NON-NLS-1$
}
}
}
}
public void filterMatches(BundleRequirement requirement, Collection<BundleCapability> candidates) {
if (Debug.DEBUG_HOOKS) {
Debug.println("ResolverHook.filterMatches(" + requirement + ", " + candidates + ")"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
if (hooks.isEmpty())
return;
candidates = new ShrinkableCollection<BundleCapability>(candidates);
for (Iterator<HookReference> iHooks = hooks.iterator(); iHooks.hasNext();) {
HookReference hookRef = iHooks.next();
if (hookRef.reference.getBundle() == null) {
handleHookException(null, hookRef.hook, "filterMatches"); //$NON-NLS-1$
} else {
try {
hookRef.hook.filterMatches(requirement, candidates);
} catch (Throwable t) {
handleHookException(t, hookRef.hook, "filterMatches"); //$NON-NLS-1$
}
}
}
}
public void end() {
if (Debug.DEBUG_HOOKS) {
Debug.println("ResolverHook.end"); //$NON-NLS-1$
}
if (hooks.isEmpty())
return;
try {
HookReference missingHook = null;
Throwable endError = null;
HookReference endBadHook = null;
for (Iterator<HookReference> iHooks = hooks.iterator(); iHooks.hasNext();) {
HookReference hookRef = iHooks.next();
// We do not remove unregistered services here because we are going to remove all of them at the end
if (hookRef.reference.getBundle() == null) {
if (missingHook == null)
missingHook = hookRef;
} else {
try {
hookRef.hook.end();
} catch (Throwable t) {
// Must continue on to the next hook.end method
// save the error for throwing at the end
if (endError == null) {
endError = t;
endBadHook = hookRef;
}
}
}
}
if (missingHook != null)
handleHookException(null, missingHook.hook, "end"); //$NON-NLS-1$
if (endError != null)
handleHookException(endError, endBadHook.hook, "end"); //$NON-NLS-1$
} finally {
releaseHooks(hooks);
}
}
}
}
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