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/*
* Copyright (c) 2012, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.hk2.internal;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.ServiceConfigurationError;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.hk2.api.ServiceLocatorFactory;
import org.glassfish.hk2.api.ServiceLocatorListener;
import org.glassfish.hk2.extension.ServiceLocatorGenerator;
import org.glassfish.hk2.osgiresourcelocator.ServiceLoader;
import org.glassfish.hk2.utilities.reflection.Logger;
/**
* The implementation of the {@link ServiceLocatorFactory} that looks
* in the OSGi service registry or the META-INF/services for the implementation
* to use. Failing those things, it uses the standard default locator
* generator, which is found in auto-depends, which is the 99.9% case
*
* @author jwells
*/
public class ServiceLocatorFactoryImpl extends ServiceLocatorFactory {
private final static String DEBUG_SERVICE_LOCATOR_PROPERTY = "org.jvnet.hk2.properties.debug.service.locator.lifecycle";
private final static boolean DEBUG_SERVICE_LOCATOR_LIFECYCLE = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Boolean run() {
return Boolean.parseBoolean(System.getProperty(DEBUG_SERVICE_LOCATOR_PROPERTY, "false"));
}
});
private static final Object sLock = new Object();
private static int name_count = 0;
private static final String GENERATED_NAME_PREFIX = "__HK2_Generated_";
private final static class DefaultGeneratorInitializer {
private final static ServiceLocatorGenerator defaultGenerator = getGeneratorSecure();
}
private final Object lock = new Object();
private final HashMap serviceLocators = new HashMap();
private final HashSet listeners = new HashSet();
private static ServiceLocatorGenerator getGeneratorSecure() {
return AccessController.doPrivileged(new PrivilegedAction() {
@Override
public ServiceLocatorGenerator run() {
try {
return getGenerator();
}
catch (Throwable th) {
Logger.getLogger().warning("Error finding implementation of hk2:", th);
return null;
}
}
});
}
/**
* This will create a new set of name to locator mappings
*/
public ServiceLocatorFactoryImpl() {
}
private static Iterable getOSGiSafeGenerators() {
try {
return ServiceLoader.lookupProviderInstances(ServiceLocatorGenerator.class);
}
catch (Throwable th) {
// The bundle providing ServiceLoader need not be on the classpath
return null;
}
}
private static ServiceLocatorGenerator getGenerator() {
Iterable generators = getOSGiSafeGenerators();
if (generators != null) {
// non-null indicates we are in OSGi environment
// So, we will return whatever we find. If we don't find anything here, then we assume it is a
// configuration error and return null.
// Since org.glassfish.hk2.osgiresourcelocator.ServiceLoader never throws ServiceConfigurationError,
// there is no need to catch it and try next item in the iterator.
final Iterator iterator = generators.iterator();
return iterator.hasNext() ? iterator.next() : null;
}
// We are in non-OSGi environment, let's use JDK ServiceLoader instead.
// Make sure we use our current loader to locate the service as opposed to some arbitrary TCL
final ClassLoader classLoader = ServiceLocatorFactoryImpl.class.getClassLoader();
Iterator providers = java.util.ServiceLoader.load(ServiceLocatorGenerator.class,
classLoader).iterator();
while (providers.hasNext()) {
try {
return providers.next();
} catch (ServiceConfigurationError sce) {
// This can happen. See the exception javadoc for more details.
Logger.getLogger().debug("ServiceLocatorFactoryImpl", "getGenerator", sce);
// We will try the next one
}
}
Logger.getLogger().warning("Cannot find a default implementation of the HK2 ServiceLocatorGenerator");
return null;
}
/* (non-Javadoc)
* @see org.glassfish.hk2.api.ServiceLocatorFactory#create(java.lang.String, org.glassfish.hk2.api.Module)
*/
@Override
public ServiceLocator create(String name) {
return create(name, null, null, CreatePolicy.RETURN);
}
/* (non-Javadoc)
* @see org.glassfish.hk2.api.ServiceLocatorFactory#find(java.lang.String)
*/
@Override
public ServiceLocator find(String name) {
synchronized (lock) {
return serviceLocators.get(name);
}
}
/* (non-Javadoc)
* @see org.glassfish.hk2.api.ServiceLocatorFactory#destroy(java.lang.String)
*/
@Override
public void destroy(String name) {
destroy(name, null);
}
private void destroy(String name, ServiceLocator locator) {
ServiceLocator killMe = null;
synchronized (lock) {
if (name != null) {
killMe = serviceLocators.remove(name);
}
if (DEBUG_SERVICE_LOCATOR_LIFECYCLE) {
Logger.getLogger().debug("ServiceFactoryImpl destroying locator with name " + name + " and locator " + locator +
" with found locator " + killMe,
new Throwable());
}
if (killMe == null) {
killMe = locator;
}
if (killMe != null) {
for (ServiceLocatorListener listener : listeners) {
try {
listener.locatorDestroyed(killMe);
}
catch (Throwable th) {
Logger.getLogger().debug(getClass().getName(), "destroy " + listener, th);
}
}
}
}
if (killMe != null) {
killMe.shutdown();
}
}
public void destroy(ServiceLocator locator) {
if (locator == null) return;
destroy(locator.getName(), locator);
}
/* (non-Javadoc)
* @see org.glassfish.hk2.api.ServiceLocatorFactory#create(java.lang.String, org.glassfish.hk2.api.Module, org.glassfish.hk2.api.ServiceLocator)
*/
@Override
public ServiceLocator create(String name,
ServiceLocator parent) {
return create(name, parent, null, CreatePolicy.RETURN);
}
private static String getGeneratedName() {
synchronized (sLock) {
return GENERATED_NAME_PREFIX + name_count++;
}
}
/* (non-Javadoc)
* @see org.glassfish.hk2.api.ServiceLocatorFactory#create(java.lang.String, org.glassfish.hk2.api.ServiceLocator, org.glassfish.hk2.extension.ServiceLocatorGenerator)
*/
@Override
public ServiceLocator create(String name, ServiceLocator parent,
ServiceLocatorGenerator generator) {
return create(name, parent, generator, CreatePolicy.RETURN);
}
private void callListenerAdded(ServiceLocator added) {
for (ServiceLocatorListener listener : listeners) {
try {
listener.locatorAdded(added);
}
catch (Throwable th) {
Logger.getLogger().debug(getClass().getName(), "create " + listener, th);
}
}
}
@Override
public ServiceLocator create(String name, ServiceLocator parent,
ServiceLocatorGenerator generator, CreatePolicy policy) {
if (DEBUG_SERVICE_LOCATOR_LIFECYCLE) {
Logger.getLogger().debug("ServiceFactoryImpl given create of " + name + " with parent " + parent +
" with generator " + generator + " and policy " + policy, new Throwable());
}
synchronized (lock) {
ServiceLocator retVal;
if (name == null) {
name = getGeneratedName();
ServiceLocator added = internalCreate(name, parent, generator);
callListenerAdded(added);
if (DEBUG_SERVICE_LOCATOR_LIFECYCLE) {
Logger.getLogger().debug("ServiceFactoryImpl added untracked listener " + added);
}
return added;
}
retVal = serviceLocators.get(name);
if (retVal != null) {
if (policy == null || CreatePolicy.RETURN.equals(policy)) {
if (DEBUG_SERVICE_LOCATOR_LIFECYCLE) {
Logger.getLogger().debug("ServiceFactoryImpl added found listener under RETURN policy of " + retVal);
}
return retVal;
}
if (policy.equals(CreatePolicy.DESTROY)) {
destroy(retVal);
}
else {
throw new IllegalStateException(
"A ServiceLocator named " + name + " already exists");
}
}
retVal = internalCreate(name, parent, generator);
serviceLocators.put(name, retVal);
callListenerAdded(retVal);
if (DEBUG_SERVICE_LOCATOR_LIFECYCLE) {
Logger.getLogger().debug("ServiceFactoryImpl created locator " + retVal);
}
return retVal;
}
}
private ServiceLocator internalCreate(String name, ServiceLocator parent, ServiceLocatorGenerator generator) {
if (generator == null) {
if (DefaultGeneratorInitializer.defaultGenerator == null) {
throw new IllegalStateException("No generator was provided and there is no default generator registered");
}
generator = DefaultGeneratorInitializer.defaultGenerator;
}
return generator.create(name, parent);
}
@Override
public void addListener(ServiceLocatorListener listener) {
if (listener == null) throw new IllegalArgumentException();
synchronized (lock) {
if (listeners.contains(listener)) return;
try {
HashSet currentLocators = new HashSet(serviceLocators.values());
listener.initialize(Collections.unmodifiableSet(currentLocators));
}
catch (Throwable th) {
// Not added to the set of listeners
Logger.getLogger().debug(getClass().getName(), "addListener " + listener, th);
return;
}
listeners.add(listener);
}
}
@Override
public void removeListener(ServiceLocatorListener listener) {
if (listener == null) throw new IllegalArgumentException();
synchronized (lock) {
listeners.remove(listener);
}
}
}
