/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.felix.framework;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.felix.framework.capabilityset.CapabilitySet;
import org.apache.felix.framework.capabilityset.SimpleFilter;
import org.apache.felix.framework.resolver.CandidateComparator;
import org.apache.felix.framework.resolver.ResolveException;
import org.apache.felix.framework.util.FelixConstants;
import org.apache.felix.framework.util.ShrinkableCollection;
import org.apache.felix.framework.util.Util;
import org.apache.felix.framework.util.manifestparser.NativeLibrary;
import org.apache.felix.framework.wiring.BundleRequirementImpl;
import org.apache.felix.framework.wiring.BundleWireImpl;
import org.apache.felix.resolver.ResolverImpl;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleEvent;
import org.osgi.framework.BundleException;
import org.osgi.framework.BundlePermission;
import org.osgi.framework.CapabilityPermission;
import org.osgi.framework.Constants;
import org.osgi.framework.PackagePermission;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.hooks.resolver.ResolverHook;
import org.osgi.framework.hooks.resolver.ResolverHookFactory;
import org.osgi.framework.wiring.BundleCapability;
import org.osgi.framework.wiring.BundleRequirement;
import org.osgi.framework.wiring.BundleRevision;
import org.osgi.framework.wiring.BundleWire;
import org.osgi.framework.wiring.BundleWiring;
import org.osgi.resource.Capability;
import org.osgi.resource.Requirement;
import org.osgi.resource.Resource;
import org.osgi.resource.Wire;
import org.osgi.resource.Wiring;
import org.osgi.service.resolver.ResolutionException;
import org.osgi.service.resolver.Resolver;
class StatefulResolver
{
private final Logger m_logger;
private final Felix m_felix;
private final ServiceRegistry m_registry;
private final Executor m_executor;
private final ResolverImpl m_resolver;
private boolean m_isResolving = false;
// Set of all revisions.
private final Set<BundleRevision> m_revisions;
// Set of all fragments.
private final Set<BundleRevision> m_fragments;
// Capability sets.
private final Map<String, CapabilitySet> m_capSets;
// Maps singleton symbolic names to list of bundle revisions sorted by version.
private final Map<String, List<BundleRevision>> m_singletons;
// Selected singleton bundle revisions.
private final Set<BundleRevision> m_selectedSingletons;
StatefulResolver(Felix felix, ServiceRegistry registry)
{
m_felix = felix;
m_registry = registry;
m_logger = m_felix.getLogger();
m_executor = getExecutor();
m_resolver = new ResolverImpl(m_logger, m_executor);
m_revisions = new HashSet<BundleRevision>();
m_fragments = new HashSet<BundleRevision>();
m_capSets = new HashMap<String, CapabilitySet>();
m_singletons = new HashMap<String, List<BundleRevision>>();
m_selectedSingletons = new HashSet<BundleRevision>();
List<String> indices = new ArrayList<String>();
indices.add(BundleRevision.BUNDLE_NAMESPACE);
m_capSets.put(BundleRevision.BUNDLE_NAMESPACE, new CapabilitySet(indices, true));
indices = new ArrayList<String>();
indices.add(BundleRevision.PACKAGE_NAMESPACE);
m_capSets.put(BundleRevision.PACKAGE_NAMESPACE, new CapabilitySet(indices, true));
indices = new ArrayList<String>();
indices.add(BundleRevision.HOST_NAMESPACE);
m_capSets.put(BundleRevision.HOST_NAMESPACE, new CapabilitySet(indices, true));
}
private Executor getExecutor()
{
String str = m_felix.getProperty(FelixConstants.RESOLVER_PARALLELISM);
int parallelism = Runtime.getRuntime().availableProcessors();
if (str != null)
{
try
{
parallelism = Integer.parseInt(str);
}
catch (NumberFormatException e)
{
// Ignore
}
}
if (parallelism <= 1)
{
return new Executor()
{
public void execute(Runnable command)
{
command.run();
}
};
}
else
{
ThreadPoolExecutor executor = new ThreadPoolExecutor(
parallelism, parallelism,
60, TimeUnit.SECONDS,
new LinkedBlockingQueue<Runnable>(),
new ThreadFactory()
{
final AtomicInteger counter = new AtomicInteger();
@Override
public Thread newThread(Runnable r)
{
return new Thread(r, "FelixResolver-" + counter.incrementAndGet());
}
});
executor.allowCoreThreadTimeOut(true);
return executor;
}
}
void start()
{
m_registry.registerService(m_felix,
new String[] { Resolver.class.getName() },
new ResolverImpl(m_logger, 1),
null);
}
synchronized void addRevision(BundleRevision br)
{
// Always attempt to remove the revision, since
// this method can be used for re-indexing a revision
// after it has been resolved.
removeRevision(br);
m_revisions.add(br);
// Add singletons to the singleton map.
boolean isSingleton = Util.isSingleton(br);
if (isSingleton)
{
// Index the new singleton.
addToSingletonMap(m_singletons, br);
}
// We always need to index non-singleton bundle capabilities, but
// singleton bundles only need to be index if they are resolved.
// Unresolved singleton capabilities are only indexed before a
// resolve operation when singleton selection is performed.
if (!isSingleton || (br.getWiring() != null))
{
if (Util.isFragment(br))
{
m_fragments.add(br);
}
indexCapabilities(br);
}
}
synchronized void removeRevision(BundleRevision br)
{
if (m_revisions.remove(br))
{
m_fragments.remove(br);
deindexCapabilities(br);
// If this module is a singleton, then remove it from the
// singleton map.
List<BundleRevision> revisions = m_singletons.get(br.getSymbolicName());
if (revisions != null)
{
revisions.remove(br);
if (revisions.isEmpty())
{
m_singletons.remove(br.getSymbolicName());
}
}
}
}
boolean isEffective(Requirement req)
{
String effective = req.getDirectives().get(Constants.EFFECTIVE_DIRECTIVE);
return ((effective == null) || effective.equals(Constants.EFFECTIVE_RESOLVE));
}
synchronized List<BundleCapability> findProviders(
BundleRequirement req, boolean obeyMandatory)
{
ResolverHookRecord record = new ResolverHookRecord(
Collections.<ServiceReference<ResolverHookFactory>, ResolverHook>emptyMap(), null);
return findProvidersInternal(record, req, obeyMandatory, true);
}
synchronized List<BundleCapability> findProvidersInternal(
final ResolverHookRecord record,
final Requirement req,
final boolean obeyMandatory,
final boolean invokeHooksAndSecurity)
{
List<BundleCapability> result = new ArrayList<BundleCapability>();
CapabilitySet capSet = m_capSets.get(req.getNamespace());
if (capSet != null)
{
// Get the requirement's filter; if this is our own impl we
// have a shortcut to get the already parsed filter, otherwise
// we must parse it from the directive.
SimpleFilter sf;
if (req instanceof BundleRequirementImpl)
{
sf = ((BundleRequirementImpl) req).getFilter();
}
else
{
String filter = req.getDirectives().get(Constants.FILTER_DIRECTIVE);
if (filter == null)
{
sf = new SimpleFilter(null, null, SimpleFilter.MATCH_ALL);
}
else
{
sf = SimpleFilter.parse(filter);
}
}
// Find the matching candidates.
Set<Capability> matches = capSet.match(sf, obeyMandatory);
// Filter matching candidates.
for (Capability cap : matches)
{
if (!(cap instanceof BundleCapability))
continue;
BundleCapability bcap = (BundleCapability) cap;
// Filter according to security.
if (invokeHooksAndSecurity && filteredBySecurity((BundleRequirement)req, bcap))
{
continue;
}
// Filter already resolved hosts, since we don't support
// dynamic attachment of fragments.
if (req.getNamespace().equals(BundleRevision.HOST_NAMESPACE)
&& (bcap.getRevision().getWiring() != null))
{
continue;
}
result.add(bcap);
}
}
if ( invokeHooksAndSecurity )
{
// If we have resolver hooks, then we may need to filter our results
// based on a whitelist and/or fine-grained candidate filtering.
if (!result.isEmpty() && !record.getResolverHookRefs().isEmpty())
{
// It we have a whitelist, then first filter out candidates
// from disallowed revisions.
if (record.getBundleRevisionWhitelist() != null)
{
for (Iterator<BundleCapability> it = result.iterator(); it.hasNext(); )
{
if (!record.getBundleRevisionWhitelist().contains(it.next().getRevision()))
{
it.remove();
}
}
}
// Now give the hooks a chance to do fine-grained filtering.
ShrinkableCollection<BundleCapability> shrinkable =
new ShrinkableCollection<BundleCapability>(result);
for (ResolverHook hook : record.getResolverHooks())
{
try
{
Felix.m_secureAction
.invokeResolverHookMatches(hook, (BundleRequirement)req, shrinkable);
}
catch (Throwable th)
{
m_logger.log(Logger.LOG_WARNING, "Resolver hook exception.", th);
}
}
}
}
Collections.sort(result, new CandidateComparator());
return result;
}
private boolean filteredBySecurity(BundleRequirement req, BundleCapability cap)
{
if (System.getSecurityManager() != null)
{
BundleRevisionImpl reqRevision = (BundleRevisionImpl) req.getRevision();
if (req.getNamespace().equals(BundleRevision.PACKAGE_NAMESPACE))
{
if (!((BundleProtectionDomain) ((BundleRevisionImpl) cap.getRevision()).getProtectionDomain()).impliesDirect(
new PackagePermission((String) cap.getAttributes().get(BundleRevision.PACKAGE_NAMESPACE),
PackagePermission.EXPORTONLY)) ||
!((reqRevision == null) ||
((BundleProtectionDomain) reqRevision.getProtectionDomain()).impliesDirect(
new PackagePermission((String) cap.getAttributes().get(BundleRevision.PACKAGE_NAMESPACE),
cap.getRevision().getBundle(),PackagePermission.IMPORT))
))
{
if (reqRevision != cap.getRevision())
{
return true;
}
}
}
else if (req.getNamespace().equals(BundleRevision.BUNDLE_NAMESPACE))
{ if (!((BundleProtectionDomain) ((BundleRevisionImpl) cap.getRevision()).getProtectionDomain()).impliesDirect(
new BundlePermission(cap.getRevision().getSymbolicName(), BundlePermission.PROVIDE)) ||
!((reqRevision == null) ||
((BundleProtectionDomain) reqRevision.getProtectionDomain()).impliesDirect(
new BundlePermission(reqRevision.getSymbolicName(), BundlePermission.REQUIRE))
))
{
return true;
}
}
else if (req.getNamespace().equals(BundleRevision.HOST_NAMESPACE))
{
if (!((BundleProtectionDomain) reqRevision.getProtectionDomain())
.impliesDirect(new BundlePermission(
reqRevision.getSymbolicName(),
BundlePermission.FRAGMENT))
|| !((BundleProtectionDomain) ((BundleRevisionImpl) cap.getRevision()).getProtectionDomain())
.impliesDirect(new BundlePermission(
cap.getRevision().getSymbolicName(),
BundlePermission.HOST)))
{
return true;
}
}
else if (!req.getNamespace().equals("osgi.ee"))
{
if (!((BundleProtectionDomain) ((BundleRevisionImpl) cap.getRevision()).getProtectionDomain()).impliesDirect(
new CapabilityPermission(req.getNamespace(), CapabilityPermission.PROVIDE))
||
!((reqRevision == null) || ((BundleProtectionDomain) reqRevision.getProtectionDomain()).impliesDirect(
new CapabilityPermission(req.getNamespace(), cap.getAttributes(), cap.getRevision().getBundle(), CapabilityPermission.REQUIRE))))
{
return true;
}
}
}
return false;
}
void resolve(
Set<BundleRevision> mandatory,
Set<BundleRevision> optional)
throws ResolutionException, BundleException
{
// Acquire global lock.
boolean locked = m_felix.acquireGlobalLock();
if (!locked)
{
throw new ResolveException(
"Unable to acquire global lock for resolve.", null, null);
}
// Make sure we are not already resolving, which can be
// the case if a resolver hook does something bad.
if (m_isResolving)
{
m_felix.releaseGlobalLock();
throw new IllegalStateException("Nested resolve operations not allowed.");
}
m_isResolving = true;
Map<Resource, List<Wire>> wireMap = null;
try
{
// Make our own copy of revisions.
mandatory = (mandatory.isEmpty())
? mandatory : new HashSet<BundleRevision>(mandatory);
optional = (optional.isEmpty())
? optional : new HashSet<BundleRevision>(optional);
// Prepare resolver hooks, if any.
ResolverHookRecord record = prepareResolverHooks(mandatory, optional);
// Select any singletons in the resolver state.
selectSingletons(record);
// Extensions are resolved differently.
for (Iterator<BundleRevision> it = mandatory.iterator(); it.hasNext(); )
{
BundleRevision br = it.next();
BundleImpl bundle = (BundleImpl) br.getBundle();
if (bundle.isExtension())
{
it.remove();
}
else if (Util.isSingleton(br) && !isSelectedSingleton(br))
{
throw new ResolveException("Singleton conflict.", br, null);
}
}
for (Iterator<BundleRevision> it = optional.iterator(); it.hasNext(); )
{
BundleRevision br = it.next();
BundleImpl bundle = (BundleImpl) br.getBundle();
if (bundle.isExtension())
{
it.remove();
}
else if (Util.isSingleton(br) && !isSelectedSingleton(br))
{
it.remove();
}
}
// Catch any resolve exception to rethrow later because
// we may need to call end() on resolver hooks.
ResolutionException rethrow = null;
try
{
// Resolve the revision.
wireMap = m_resolver.resolve(
new ResolveContextImpl(
this,
getWirings(),
record,
mandatory,
optional,
getFragments()));
}
catch (ResolutionException ex)
{
rethrow = ex;
}
// Release resolver hooks, if any.
releaseResolverHooks(record);
// If the resolve failed, rethrow the exception.
if (rethrow != null)
{
throw rethrow;
}
// Otherwise, mark all revisions as resolved.
markResolvedRevisions(wireMap);
}
finally
{
// Clear resolving flag.
m_isResolving = false;
// Always release the global lock.
m_felix.releaseGlobalLock();
}
fireResolvedEvents(wireMap);
}
BundleRevision resolve(BundleRevision revision, String pkgName)
throws ResolutionException, BundleException
{
BundleRevision provider = null;
// We cannot dynamically import if the revision is not already resolved
// or if it is not allowed, so check that first. Note: We check if the
// dynamic import is allowed without holding any locks, but this is
// okay since the resolver will double check later after we have
// acquired the global lock below.
if ((revision.getWiring() != null) && isAllowedDynamicImport(revision, pkgName))
{
// Acquire global lock.
boolean locked = m_felix.acquireGlobalLock();
if (!locked)
{
throw new ResolveException(
"Unable to acquire global lock for resolve.", revision, null);
}
// Make sure we are not already resolving, which can be
// the case if a resolver hook does something bad.
if (m_isResolving)
{
m_felix.releaseGlobalLock();
throw new IllegalStateException("Nested resolve operations not allowed.");
}
m_isResolving = true;
Map<Resource, List<Wire>> wireMap = null;
try
{
// Double check to make sure that someone hasn't beaten us to
// dynamically importing the package, which can happen if two
// threads are racing to do so. If we have an existing wire,
// then just return it instead.
provider = ((BundleWiringImpl) revision.getWiring())
.getImportedPackageSource(pkgName);
if (provider == null)
{
// Prepare resolver hooks, if any.
ResolverHookRecord record =
prepareResolverHooks(
Collections.singleton(revision), Collections.EMPTY_SET);
// Select any singletons in the resolver state.
selectSingletons(record);
// Catch any resolve exception to rethrow later because
// we may need to call end() on resolver hooks.
ResolutionException rethrow = null;
try
{
List<BundleRequirement> dynamics =
Util.getDynamicRequirements(revision.getWiring().getRequirements(null));
// Loop through the importer's dynamic requirements to determine if
// there is a matching one for the package from which we want to
// load a class.
Map<String, Object> attrs = Collections.singletonMap(
BundleRevision.PACKAGE_NAMESPACE, (Object) pkgName);
BundleRequirementImpl req = new BundleRequirementImpl(
revision,
BundleRevision.PACKAGE_NAMESPACE,
Collections.EMPTY_MAP,
attrs);
List<BundleCapability> candidates = findProvidersInternal(record, req, false, true);
// Try to find a dynamic requirement that matches the capabilities.
BundleRequirementImpl dynReq = null;
for (int dynIdx = 0;
(candidates.size() > 0) && (dynReq == null) && (dynIdx < dynamics.size());
dynIdx++)
{
for (Iterator<BundleCapability> itCand = candidates.iterator();
(dynReq == null) && itCand.hasNext(); )
{
Capability cap = itCand.next();
if (CapabilitySet.matches(
cap,
((BundleRequirementImpl) dynamics.get(dynIdx)).getFilter()))
{
dynReq = (BundleRequirementImpl) dynamics.get(dynIdx);
}
}
}
// If we found a matching dynamic requirement, then filter out
// any candidates that do not match it.
if (dynReq != null)
{
for (Iterator<BundleCapability> itCand = candidates.iterator();
itCand.hasNext(); )
{
Capability cap = itCand.next();
if (!CapabilitySet.matches(
cap, dynReq.getFilter()))
{
itCand.remove();
}
}
}
else
{
candidates.clear();
}
wireMap = m_resolver.resolve(
new ResolveContextImpl(
this,
getWirings(),
record,
Collections.<BundleRevision>emptyList(),
Collections.<BundleRevision>emptyList(),
getFragments()),
revision, dynReq, new ArrayList<Capability>(candidates));
}
catch (ResolutionException ex)
{
rethrow = ex;
}
// Release resolver hooks, if any.
releaseResolverHooks(record);
// If the resolve failed, rethrow the exception.
if (rethrow != null)
{
throw rethrow;
}
if ((wireMap != null) && wireMap.containsKey(revision))
{
List<Wire> dynamicWires = wireMap.remove(revision);
Wire dynamicWire = dynamicWires.get(0);
// Mark all revisions as resolved.
markResolvedRevisions(wireMap);
// Dynamically add new wire to importing revision.
if (dynamicWire != null)
{
// TODO is a rw already a BundleWire?
// TODO can we optimize this?
if (dynamicWire.getRequirer() instanceof BundleRevision &&
dynamicWire.getRequirement() instanceof BundleRequirement &&
dynamicWire.getProvider() instanceof BundleRevision &&
dynamicWire.getCapability() instanceof BundleCapability)
{
BundleRevision dwRequirer = (BundleRevision) dynamicWire.getRequirer();
BundleRequirement dwRequirement = (BundleRequirement) dynamicWire.getRequirement();
BundleRevision dwProvider = (BundleRevision) dynamicWire.getProvider();
BundleCapability dwCapability = (BundleCapability) dynamicWire.getCapability();
BundleWire bw = new BundleWireImpl(
dwRequirer,
dwRequirement,
dwProvider,
dwCapability);
m_felix.getDependencies().addDependent(bw);
((BundleWiringImpl) revision.getWiring()).addDynamicWire(bw);
m_felix.getLogger().log(
Logger.LOG_DEBUG,
"DYNAMIC WIRE: " + dynamicWire);
provider = ((BundleWiringImpl) revision.getWiring())
.getImportedPackageSource(pkgName);
}
}
}
}
}
finally
{
// Clear resolving flag.
m_isResolving = false;
// Always release the global lock.
m_felix.releaseGlobalLock();
}
fireResolvedEvents(wireMap);
}
return provider;
}
private ResolverHookRecord prepareResolverHooks(
Set<BundleRevision> mandatory, Set<BundleRevision> optional)
throws BundleException, ResolutionException
{
// This map maps the hook factory service to the actual hook objects. It
// needs to be a map that preserves insertion order to ensure that we call
// hooks in the correct order.
// The hooks are added in the order that m_felix.getHooks() returns them which
// is also the order in which they should be called.
Map<ServiceReference<ResolverHookFactory>, ResolverHook> hookMap =
new LinkedHashMap<ServiceReference<ResolverHookFactory>, ResolverHook>();
// Get resolver hook factories.
Set<ServiceReference<ResolverHookFactory>> hookRefs =
m_felix.getHookRegistry().getHooks(ResolverHookFactory.class);
Collection<BundleRevision> whitelist;
if (!hookRefs.isEmpty())
{
// Create triggers list.
Set<BundleRevision> triggers;
if (!mandatory.isEmpty() && !optional.isEmpty())
{
triggers = new HashSet<BundleRevision>(mandatory);
triggers.addAll(optional);
}
else
{
triggers = (mandatory.isEmpty())
? optional : mandatory;
}
triggers = Collections.unmodifiableSet(triggers);
BundleException rethrow = null;
// Create resolver hook objects by calling begin() on factory.
for (ServiceReference<ResolverHookFactory> ref : hookRefs)
{
try
{
ResolverHookFactory rhf = m_felix.getService(m_felix, ref, false);
if (rhf != null)
{
ResolverHook hook =
Felix.m_secureAction
.invokeResolverHookFactory(rhf, triggers);
if (hook != null)
{
hookMap.put(ref, hook);
}
}
}
catch (Throwable ex)
{
rethrow = new BundleException(
"Resolver hook exception: " + ex.getMessage(),
BundleException.REJECTED_BY_HOOK,
ex);
// Resolver hook spec: if there is an exception during the resolve operation; abort.
// So we break here to make sure that no further resolver hooks are created.
break;
}
}
if (rethrow != null)
{
for (ResolverHook hook : hookMap.values())
{
try
{
Felix.m_secureAction.invokeResolverHookEnd(hook);
}
catch (Exception ex)
{
rethrow = new BundleException(
"Resolver hook exception: " + ex.getMessage(),
BundleException.REJECTED_BY_HOOK,
ex);
}
}
throw rethrow;
}
// Ask hooks to indicate which revisions should not be resolved.
whitelist = new ShrinkableCollection<BundleRevision>(getUnresolvedRevisions());
int originalSize = whitelist.size();
for (ResolverHook hook : hookMap.values())
{
try
{
Felix.m_secureAction
.invokeResolverHookResolvable(hook, whitelist);
}
catch (Throwable ex)
{
rethrow = new BundleException(
"Resolver hook exception: " + ex.getMessage(),
BundleException.REJECTED_BY_HOOK,
ex);
// Resolver hook spec: if there is an exception during the resolve operation; abort.
// So we break here to make sure that no further resolver operations are executed.
break;
}
}
if (rethrow != null)
{
for (ResolverHook hook : hookMap.values())
{
try
{
Felix.m_secureAction.invokeResolverHookEnd(hook);
}
catch (Exception ex)
{
rethrow = new BundleException(
"Resolver hook exception: " + ex.getMessage(),
BundleException.REJECTED_BY_HOOK,
ex);
}
}
throw rethrow;
}
// If nothing was removed, then just null the whitelist
// as an optimization.
if (whitelist.size() == originalSize)
{
whitelist = null;
}
// Check to make sure the target revisions are allowed to resolve.
if (whitelist != null)
{
// We only need to check this for the non-dynamic import
// case. The dynamic import case will only have one resolved
// trigger revision in the mandatory set, so ignore that case.
if (mandatory.isEmpty()
|| !optional.isEmpty()
|| (mandatory.iterator().next().getWiring() == null))
{
mandatory.retainAll(whitelist);
optional.retainAll(whitelist);
if (mandatory.isEmpty() && optional.isEmpty())
{
throw new ResolveException(
"Resolver hook prevented resolution.", null, null);
}
}
}
}
else
{
whitelist = null;
}
return new ResolverHookRecord(hookMap, whitelist);
}
private void releaseResolverHooks(ResolverHookRecord record)
throws BundleException
{
// If we have resolver hooks, we must call end() on them.
if (!record.getResolverHookRefs().isEmpty())
{
// Verify that all resolver hook service references are still valid
// Call end() on resolver hooks.
for (ResolverHook hook : record.getResolverHooks())
{
try
{
Felix.m_secureAction.invokeResolverHookEnd(hook);
}
catch (Throwable th)
{
m_logger.log(
Logger.LOG_WARNING, "Resolver hook exception.", th);
}
}
// Verify that all hook service references are still valid
// and unget all resolver hook factories.
boolean invalid = false;
for (ServiceReference<ResolverHookFactory> ref : record.getResolverHookRefs())
{
if (ref.getBundle() == null)
{
invalid = true;
}
m_felix.ungetService(m_felix, ref, null);
}
if (invalid)
{
throw new BundleException(
"Resolver hook service unregistered during resolve.",
BundleException.REJECTED_BY_HOOK);
}
}
}
// This method duplicates a lot of logic from:
// ResolverImpl.getDynamicImportCandidates()
// This is only a rough check since it doesn't include resolver hooks.
boolean isAllowedDynamicImport(BundleRevision revision, String pkgName)
{
// Unresolved revisions cannot dynamically import, nor can the default
// package be dynamically imported.
if ((revision.getWiring() == null) || pkgName.length() == 0)
{
return false;
}
// If the revision doesn't have dynamic imports, then just return
// immediately.
List<BundleRequirement> dynamics =
Util.getDynamicRequirements(revision.getWiring().getRequirements(null));
if ((dynamics == null) || dynamics.isEmpty())
{
return false;
}
// If the revision exports this package, then we cannot
// attempt to dynamically import it.
for (BundleCapability cap : revision.getWiring().getCapabilities(null))
{
if (cap.getNamespace().equals(BundleRevision.PACKAGE_NAMESPACE)
&& cap.getAttributes().get(BundleRevision.PACKAGE_NAMESPACE).equals(pkgName))
{
return false;
}
}
// If this revision already imports or requires this package, then
// we cannot dynamically import it.
if (((BundleWiringImpl) revision.getWiring()).hasPackageSource(pkgName))
{
return false;
}
// Loop through the importer's dynamic requirements to determine if
// there is a matching one for the package from which we want to
// load a class.
Map<String, Object> attrs = Collections.singletonMap(
BundleRevision.PACKAGE_NAMESPACE, (Object) pkgName);
BundleRequirementImpl req = new BundleRequirementImpl(
revision,
BundleRevision.PACKAGE_NAMESPACE,
Collections.EMPTY_MAP,
attrs);
List<BundleCapability> candidates = findProviders(req, false);
// Try to find a dynamic requirement that matches the capabilities.
BundleRequirementImpl dynReq = null;
for (int dynIdx = 0;
(candidates.size() > 0) && (dynReq == null) && (dynIdx < dynamics.size());
dynIdx++)
{
for (Iterator<BundleCapability> itCand = candidates.iterator();
(dynReq == null) && itCand.hasNext(); )
{
Capability cap = itCand.next();
if (CapabilitySet.matches(
cap,
((BundleRequirementImpl) dynamics.get(dynIdx)).getFilter()))
{
dynReq = (BundleRequirementImpl) dynamics.get(dynIdx);
}
}
}
// If we found a matching dynamic requirement, then filter out
// any candidates that do not match it.
if (dynReq != null)
{
for (Iterator<BundleCapability> itCand = candidates.iterator();
itCand.hasNext(); )
{
Capability cap = itCand.next();
if (!CapabilitySet.matches(
cap, dynReq.getFilter()))
{
itCand.remove();
}
}
}
else
{
candidates.clear();
}
return !candidates.isEmpty();
}
private void markResolvedRevisions(Map<Resource, List<Wire>> wireMap)
throws ResolveException
{
boolean debugLog = m_felix.getLogger().getLogLevel() >= Logger.LOG_DEBUG;
// DO THIS IN THREE PASSES:
// 1. Aggregate fragments per host.
// 2. Attach wires and fragments to hosts.
// -> If fragments fail to attach, then undo.
// 3. Mark hosts and fragments as resolved.
// First pass.
if (wireMap != null)
{
// First pass: Loop through the wire map to find the host wires
// for any fragments and map a host to all of its fragments.
Map<Resource, List<BundleRevision>> hosts =
new HashMap<Resource, List<BundleRevision>>();
for (Entry<Resource, List<Wire>> entry : wireMap.entrySet())
{
Resource revision = entry.getKey();
List<Wire> wires = entry.getValue();
if (Util.isFragment(revision))
{
for (Wire w : wires)
{
List<BundleRevision> fragments = hosts.get(w.getProvider());
if (fragments == null)
{
fragments = new ArrayList<BundleRevision>();
hosts.put(w.getProvider(), fragments);
}
if (w.getRequirer() instanceof BundleRevision)
fragments.add((BundleRevision) w.getRequirer());
}
}
}
// Second pass: Loop through the wire map to do three things:
// 1) convert resolver wires to bundle wires 2) create wiring
// objects for revisions and 3) record dependencies among
// revisions. We don't actually set the wirings here because
// that indicates that a revision is resolved and we don't want
// to mark anything as resolved unless we succussfully create
// all wirings.
Map<BundleRevision, BundleWiringImpl> wirings =
new HashMap<BundleRevision, BundleWiringImpl>(wireMap.size());
for (Entry<Resource, List<Wire>> entry : wireMap.entrySet())
{
Resource resource = entry.getKey();
if (!(resource instanceof BundleRevision))
continue;
BundleRevision revision = (BundleRevision) resource;
List<Wire> resolverWires = entry.getValue();
List<BundleWire> bundleWires =
new ArrayList<BundleWire>(resolverWires.size());
// Need to special case fragments since they may already have
// wires if they are already attached to another host; if that
// is the case, then we want to merge the old host wires with
// the new ones.
if ((revision.getWiring() != null) && Util.isFragment(revision))
{
// Fragments only have host wires, so just add them all.
bundleWires.addAll(revision.getWiring().getRequiredWires(null));
}
// Loop through resolver wires to calculate the package
// space implied by the wires as well as to record the
// dependencies.
Map<String, BundleRevision> importedPkgs =
new HashMap<String, BundleRevision>();
Map<String, List<BundleRevision>> requiredPkgs =
new HashMap<String, List<BundleRevision>>();
for (Wire rw : resolverWires)
{
// TODO is a rw already a BundleWire?
// TODO can we optimize this?
if (!(rw.getRequirer() instanceof BundleRevision))
continue;
BundleRevision requirer = (BundleRevision) rw.getRequirer();
if (!(rw.getRequirement() instanceof BundleRequirement))
continue;
BundleRequirement requirement = (BundleRequirement) rw.getRequirement();
if (!(rw.getProvider() instanceof BundleRevision))
continue;
BundleRevision provider = (BundleRevision) rw.getProvider();
if (!(rw.getCapability() instanceof BundleCapability))
continue;
BundleCapability capability = (BundleCapability) rw.getCapability();
BundleWire bw = new BundleWireImpl(
requirer,
requirement,
provider,
capability);
bundleWires.add(bw);
if (Util.isFragment(revision))
{
if (debugLog)
{
m_felix.getLogger().log(
Logger.LOG_DEBUG,
"FRAGMENT WIRE: " + rw.toString());
}
}
else
{
if (debugLog)
{
m_felix.getLogger().log(Logger.LOG_DEBUG, "WIRE: " + rw.toString());
}
if (capability.getNamespace()
.equals(BundleRevision.PACKAGE_NAMESPACE))
{
importedPkgs.put(
(String) capability.getAttributes()
.get(BundleRevision.PACKAGE_NAMESPACE),
provider);
}
else if (capability.getNamespace()
.equals(BundleRevision.BUNDLE_NAMESPACE))
{
Set<String> pkgs = calculateExportedAndReexportedPackages(
provider,
wireMap,
new HashSet<String>(),
new HashSet<BundleRevision>());
for (String pkg : pkgs)
{
List<BundleRevision> revs = requiredPkgs.get(pkg);
if (revs == null)
{
revs = new ArrayList<BundleRevision>();
requiredPkgs.put(pkg, revs);
}
revs.add(provider);
}
}
}
}
List<BundleRevision> fragments = hosts.get(revision);
try
{
wirings.put(
revision,
new BundleWiringImpl(
m_felix.getLogger(),
m_felix.getConfig(),
this,
(BundleRevisionImpl) revision,
fragments,
bundleWires,
importedPkgs,
requiredPkgs));
}
catch (Exception ex)
{
// This is a fatal error, so undo everything and
// throw an exception.
for (Entry<BundleRevision, BundleWiringImpl> wiringEntry
: wirings.entrySet())
{
// Dispose of wiring.
try
{
wiringEntry.getValue().dispose();
}
catch (Exception ex2)
{
// We are in big trouble.
RuntimeException rte = new RuntimeException(
"Unable to clean up resolver failure.", ex2);
m_felix.getLogger().log(
Logger.LOG_ERROR,
rte.getMessage(), ex2);
throw rte;
}
}
ResolveException re = new ResolveException(
"Unable to resolve " + revision,
revision, null);
re.initCause(ex);
m_felix.getLogger().log(
Logger.LOG_ERROR,
re.getMessage(), ex);
throw re;
}
}
// Third pass: Loop through the wire map to mark revision as resolved
// and update the resolver state.
for (Entry<BundleRevision, BundleWiringImpl> entry : wirings.entrySet())
{
BundleRevisionImpl revision = (BundleRevisionImpl) entry.getKey();
// Mark revision as resolved.
BundleWiring wiring = entry.getValue();
revision.resolve(entry.getValue());
// Record dependencies.
for (BundleWire bw : wiring.getRequiredWires(null))
{
m_felix.getDependencies().addDependent(bw);
}
// Reindex the revision's capabilities since its resolved
// capabilities could be different than its declared ones
// (e.g., due to substitutable exports).
addRevision(revision);
// Update the state of the revision's bundle to resolved as well.
markBundleResolved(revision);
}
}
}
private void markBundleResolved(BundleRevision revision)
{
// Update the bundle's state to resolved when the
// current revision is resolved; just ignore resolve
// events for older revisions since this only occurs
// when an update is done on an unresolved bundle
// and there was no refresh performed.
BundleImpl bundle = (BundleImpl) revision.getBundle();
// Lock the bundle first.
try
{
// Acquire bundle lock.
try
{
m_felix.acquireBundleLock(
bundle, Bundle.INSTALLED | Bundle.RESOLVED | Bundle.ACTIVE);
}
catch (IllegalStateException ex)
{
// There is nothing we can do.
}
if (bundle.adapt(BundleRevision.class) == revision)
{
if (bundle.getState() != Bundle.INSTALLED)
{
m_felix.getLogger().log(bundle,
Logger.LOG_WARNING,
"Received a resolve event for a bundle that has already been resolved.");
}
else
{
m_felix.setBundleStateAndNotify(bundle, Bundle.RESOLVED);
}
}
}
finally
{
m_felix.releaseBundleLock(bundle);
}
}
private void fireResolvedEvents(Map<Resource, List<Wire>> wireMap)
{
if (wireMap != null)
{
Iterator<Entry<Resource, List<Wire>>> iter =
wireMap.entrySet().iterator();
// Iterate over the map to fire necessary RESOLVED events.
while (iter.hasNext())
{
Entry<Resource, List<Wire>> entry = iter.next();
Resource resource = entry.getKey();
if (!(resource instanceof BundleRevision))
continue;
BundleRevision revision = (BundleRevision) resource;
// Fire RESOLVED events for all fragments.
List<BundleRevision> fragments =
Util.getFragments(revision.getWiring());
for (int i = 0; i < fragments.size(); i++)
{
m_felix.fireBundleEvent(
BundleEvent.RESOLVED, fragments.get(i).getBundle());
}
m_felix.fireBundleEvent(BundleEvent.RESOLVED, revision.getBundle());
}
}
}
private static Set<String> calculateExportedAndReexportedPackages(
BundleRevision br,
Map<Resource, List<Wire>> wireMap,
Set<String> pkgs,
Set<BundleRevision> cycles)
{
if (!cycles.contains(br))
{
cycles.add(br);
// Add all exported packages.
for (BundleCapability cap : br.getDeclaredCapabilities(null))
{
if (cap.getNamespace().equals(BundleRevision.PACKAGE_NAMESPACE))
{
pkgs.add((String)
cap.getAttributes().get(BundleRevision.PACKAGE_NAMESPACE));
}
}
// Now check to see if any required bundles are required with reexport
// visibility, since we need to include those packages too.
if (br.getWiring() == null)
{
for (Wire rw : wireMap.get(br))
{
if (rw.getCapability().getNamespace().equals(
BundleRevision.BUNDLE_NAMESPACE))
{
String dir = rw.getRequirement()
.getDirectives().get(Constants.VISIBILITY_DIRECTIVE);
if ((dir != null) && (dir.equals(Constants.VISIBILITY_REEXPORT)))
{
calculateExportedAndReexportedPackages(
// TODO need to fix the cast
(BundleRevision) rw.getProvider(),
wireMap,
pkgs,
cycles);
}
}
}
}
else
{
for (BundleWire bw : br.getWiring().getRequiredWires(null))
{
if (bw.getCapability().getNamespace().equals(
BundleRevision.BUNDLE_NAMESPACE))
{
String dir = bw.getRequirement()
.getDirectives().get(Constants.VISIBILITY_DIRECTIVE);
if ((dir != null) && (dir.equals(Constants.VISIBILITY_REEXPORT)))
{
calculateExportedAndReexportedPackages(
bw.getProviderWiring().getRevision(),
wireMap,
pkgs,
cycles);
}
}
}
}
}
return pkgs;
}
private synchronized void indexCapabilities(BundleRevision br)
{
List<BundleCapability> caps =
(Util.isFragment(br) || (br.getWiring() == null))
? br.getDeclaredCapabilities(null)
: br.getWiring().getCapabilities(null);
if (caps != null)
{
for (BundleCapability cap : caps)
{
// If the capability is from a different revision, then
// don't index it since it is a capability from a fragment.
// In that case, the fragment capability is still indexed.
// It will be the resolver's responsibility to find all
// attached hosts for fragments.
if (cap.getRevision() == br)
{
CapabilitySet capSet = m_capSets.get(cap.getNamespace());
if (capSet == null)
{
capSet = new CapabilitySet(null, true);
m_capSets.put(cap.getNamespace(), capSet);
}
capSet.addCapability(cap);
}
}
}
}
private synchronized void deindexCapabilities(BundleRevision br)
{
// We only need be concerned with declared capabilities here,
// because resolved capabilities will be a subset, since fragment
// capabilities are not considered to be part of the host.
List<BundleCapability> caps = br.getDeclaredCapabilities(null);
if (caps != null)
{
for (BundleCapability cap : caps)
{
CapabilitySet capSet = m_capSets.get(cap.getNamespace());
if (capSet != null)
{
capSet.removeCapability(cap);
}
}
}
}
private synchronized boolean isSelectedSingleton(BundleRevision br)
{
return m_selectedSingletons.contains(br);
}
private synchronized void selectSingletons(ResolverHookRecord record)
throws BundleException
{
// First deindex any unresolved singletons to make sure
// there aren't any available from previous resolves.
// Also remove them from the fragment list, for the same
// reason.
m_selectedSingletons.clear();
for (Entry<String, List<BundleRevision>> entry : m_singletons.entrySet())
{
for (BundleRevision singleton : entry.getValue())
{
if (singleton.getWiring() == null)
{
deindexCapabilities(singleton);
m_fragments.remove(singleton);
}
}
}
// If no resolver hooks, then use default singleton selection
// algorithm, otherwise defer to the resolver hooks.
if (record.getResolverHookRefs().isEmpty())
{
selectDefaultSingletons(record);
}
else
{
selectSingletonsUsingHooks(record);
}
}
/*
* Selects the singleton with the highest version from groupings
* based on the symbolic name. No selection is made if the group
* already has a resolved singleton.
*/
private void selectDefaultSingletons(ResolverHookRecord record)
{
// Now select the singletons available for this resolve operation.
for (Entry<String, List<BundleRevision>> entry : m_singletons.entrySet())
{
selectSingleton(record, entry.getValue());
}
}
/*
* Groups singletons based on resolver hook filtering and then selects
* the singleton from each group with the highest version that is in
* the resolver hook whitelist. No selection is made if a group already
* has a resolved singleton in it.
*/
private void selectSingletonsUsingHooks(ResolverHookRecord record)
throws BundleException
{
// Convert singleton bundle revision map into a map using
// bundle capabilities instead, since this is what the resolver
// hooks require.
Map<BundleCapability, Collection<BundleCapability>> allCollisions
= new HashMap<BundleCapability, Collection<BundleCapability>>();
for (Entry<String, List<BundleRevision>> entry : m_singletons.entrySet())
{
Collection<BundleCapability> bundleCaps =
new ArrayList<BundleCapability>();
for (BundleRevision br : entry.getValue())
{
List<BundleCapability> caps =
br.getDeclaredCapabilities(BundleRevision.BUNDLE_NAMESPACE);
if (!caps.isEmpty())
{
bundleCaps.add(caps.get(0));
}
}
for (BundleCapability bc : bundleCaps)
{
Collection<BundleCapability> capCopy =
new ShrinkableCollection<BundleCapability>(
new ArrayList<BundleCapability>(bundleCaps));
capCopy.remove(bc);
allCollisions.put(bc, capCopy);
}
}
// Invoke hooks to allow them to filter singleton collisions.
for (ResolverHook hook : record.getResolverHooks())
{
for (Entry<BundleCapability, Collection<BundleCapability>> entry
: allCollisions.entrySet())
{
try
{
Felix.m_secureAction
.invokeResolverHookSingleton(hook, entry.getKey(), entry.getValue());
}
catch (Throwable ex)
{
throw new BundleException(
"Resolver hook exception: " + ex.getMessage(),
BundleException.REJECTED_BY_HOOK,
ex);
}
}
}
// Create groups according to how the resolver hooks filtered the
// collisions.
List<List<BundleRevision>> groups = new ArrayList<List<BundleRevision>>();
while (!allCollisions.isEmpty())
{
BundleCapability target = allCollisions.entrySet().iterator().next().getKey();
groups.add(groupSingletons(allCollisions, target, new ArrayList<BundleRevision>()));
}
// Now select the singletons available for this resolve operation.
for (List<BundleRevision> group : groups)
{
selectSingleton(record, group);
}
}
private List<BundleRevision> groupSingletons(
Map<BundleCapability, Collection<BundleCapability>> allCollisions,
BundleCapability target, List<BundleRevision> group)
{
if (!group.contains(target.getRevision()))
{
// Add the target since it is implicitly part of the group.
group.add(target.getRevision());
// Recursively add the revisions of any singleton's in the
// target's collisions.
Collection<BundleCapability> collisions = allCollisions.remove(target);
for (BundleCapability collision : collisions)
{
groupSingletons(allCollisions, collision, group);
}
// Need to check the values of other collisions for this target
// and add those to the target's group too, since collisions are
// treated as two-way relationships. Repeat until there are no
// collision groups left that contain the target capability.
boolean repeat;
do
{
repeat = false;
for (Entry<BundleCapability, Collection<BundleCapability>> entry:
allCollisions.entrySet())
{
if (entry.getValue().contains(target))
{
repeat = true;
groupSingletons(allCollisions, entry.getKey(), group);
break;
}
}
}
while (repeat);
}
return group;
}
/*
* Selects the highest bundle revision from the group that is
* in the resolver hook whitelist (if there are hooks). No
* selection is made if there is an already resolved singleton
* in the group, since it is already indexed.
*/
private void selectSingleton(ResolverHookRecord record, List<BundleRevision> singletons)
{
BundleRevision selected = null;
for (BundleRevision singleton : singletons)
{
// If a singleton is already resolved,
// then there is nothing to do.
if (singleton.getWiring() != null)
{
selected = null;
break;
}
// If this singleton is not in the whitelist, then it cannot
// be selected. If it is, in can only be selected if it has
// a higher version than the currently selected singleton, if
// there is one.
if (((record.getBundleRevisionWhitelist() == null) || record.getBundleRevisionWhitelist().contains(singleton))
&& ((selected == null)
|| (selected.getVersion().compareTo(singleton.getVersion()) > 0)))
{
selected = singleton;
}
}
if (selected != null)
{
// Record the selected singleton.
m_selectedSingletons.add(selected);
// Index its capabilities.
indexCapabilities(selected);
// If the selected singleton is a fragment, then
// add it to the list of fragments.
if (Util.isFragment(selected))
{
m_fragments.add(selected);
}
}
}
private synchronized Set<BundleRevision> getFragments()
{
Set<BundleRevision> fragments = new HashSet(m_fragments);
// Filter out any fragments that are not the current revision.
for (Iterator<BundleRevision> it = fragments.iterator(); it.hasNext(); )
{
BundleRevision fragment = it.next();
BundleRevision currentFragmentRevision =
fragment.getBundle().adapt(BundleRevision.class);
if (fragment != currentFragmentRevision)
{
it.remove();
}
}
return fragments;
}
void checkNativeLibraries(BundleRevision revision) throws ResolveException
{
// Next, try to resolve any native code, since the revision is
// not resolvable if its native code cannot be loaded.
List<NativeLibrary> libs = ((BundleRevisionImpl) revision).getDeclaredNativeLibraries();
if (libs != null)
{
String msg = null;
// Verify that all native libraries exist in advance; this will
// throw an exception if the native library does not exist.
for (int libIdx = 0; (msg == null) && (libIdx < libs.size()); libIdx++)
{
String entryName = libs.get(libIdx).getEntryName();
if (entryName != null)
{
if (!((BundleRevisionImpl) revision).getContent().hasEntry(entryName))
{
msg = "Native library does not exist: " + entryName;
}
}
}
// If we have a zero-length native library array, then
// this means no native library class could be selected
// so we should fail to resolve.
if (libs.isEmpty())
{
msg = "No matching native libraries found.";
}
if (msg != null)
{
throw new ResolveException(msg, revision, null);
}
}
}
private synchronized Set<BundleRevision> getUnresolvedRevisions()
{
Set<BundleRevision> unresolved = new HashSet<BundleRevision>();
for (BundleRevision revision : m_revisions)
{
if (revision.getWiring() == null)
{
unresolved.add(revision);
}
}
return unresolved;
}
private synchronized Map<Resource, Wiring> getWirings()
{
Map<Resource, Wiring> wirings = new HashMap<Resource, Wiring>();
for (BundleRevision revision : m_revisions)
{
if (revision.getWiring() != null)
{
wirings.put(revision, revision.getWiring());
}
}
return wirings;
}
private static void addToSingletonMap(
Map<String, List<BundleRevision>> singletons, BundleRevision br)
{
List<BundleRevision> revisions = singletons.get(br.getSymbolicName());
if (revisions == null)
{
revisions = new ArrayList<BundleRevision>();
}
revisions.add(br);
singletons.put(br.getSymbolicName(), revisions);
}
static class ResolverHookRecord
{
final Map<ServiceReference<ResolverHookFactory>, ResolverHook> m_resolveHookMap;
final Collection<BundleRevision> m_brWhitelist;
/** The map passed in must be of an ordered type, so that the iteration order over the values
* is predictable.
*/
ResolverHookRecord(Map<ServiceReference<ResolverHookFactory>, ResolverHook> resolveHookMap,
Collection<BundleRevision> brWhiteList)
{
m_resolveHookMap = resolveHookMap;
m_brWhitelist = brWhiteList;
}
Collection<BundleRevision> getBundleRevisionWhitelist()
{
return m_brWhitelist;
}
Set<ServiceReference<ResolverHookFactory>> getResolverHookRefs()
{
return m_resolveHookMap.keySet();
}
// This slightly over the top implementation to obtain the hooks is to ensure that at the point that
// the actual hook is obtained, the service is still registered. There are CT tests that unregister
// the hook service while iterating over the hooks and expect that the unregistered hook is not called
// in that case.
Iterable<ResolverHook> getResolverHooks()
{
return new Iterable<ResolverHook>()
{
@Override
public Iterator<ResolverHook> iterator()
{
return new Iterator<ResolverHook>()
{
private final Iterator<Map.Entry<ServiceReference<ResolverHookFactory>, ResolverHook>> it =
m_resolveHookMap.entrySet().iterator();
private Entry<ServiceReference<ResolverHookFactory>, ResolverHook> next = null;
@Override
public boolean hasNext()
{
if (next == null)
findNext();
return next != null;
}
@Override
public ResolverHook next()
{
if (next == null)
findNext();
if (next == null)
throw new NoSuchElementException();
ResolverHook hook = next.getValue();
next = null;
return hook;
}
// Find the next hook on the iterator, but only if the service is still registered.
// If the service has since been unregistered, skip the hook.
private void findNext()
{
while (it.hasNext())
{
next = it.next();
if (next.getKey().getBundle() != null)
return;
else
next = null;
}
}
@Override
public void remove()
{
throw new UnsupportedOperationException();
}
};
}
};
}
}
}