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/*
* 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.tuscany.sca.extensibility.equinox;
import java.util.Dictionary;
import java.util.Hashtable;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.tuscany.sca.core.DefaultExtensionPointRegistry;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.ServiceRegistration;
/**
* OSGi ServiceRegistry based extension point registry
*/
public class OSGiExtensionPointRegistry extends DefaultExtensionPointRegistry {
private Map<Class<?>, ServiceRegistration> registrations = new ConcurrentHashMap<Class<?>, ServiceRegistration>();
private BundleContext bundleContext;
public OSGiExtensionPointRegistry(BundleContext bundleContext) {
super(ServiceDiscovery.getInstance(new EquinoxServiceDiscoverer(bundleContext)));
this.bundleContext = bundleContext;
}
@Override
protected void registerExtensionPoint(Class<?> extensionPointType,
Object extensionPoint,
ServiceDeclaration declaration) {
BundleContext context = bundleContext;
if (declaration instanceof EquinoxServiceDiscoverer.ServiceDeclarationImpl) {
EquinoxServiceDiscoverer.ServiceDeclarationImpl declarationImpl =
(EquinoxServiceDiscoverer.ServiceDeclarationImpl)declaration;
Bundle bundle = declarationImpl.getBundle();
/**
* If this bundle is not in the STARTING, ACTIVE, or STOPPING states or this bundle
* is a fragment bundle, then this bundle has no valid BundleContext. This method will
* return null if this bundle has no valid BundleContext
*/
if ((bundle.getState() & (Bundle.ACTIVE | Bundle.STARTING)) == 0) {
try {
bundle.start();
} catch (BundleException e) {
throw new IllegalStateException(e);
}
}
context = bundle.getBundleContext();
}
Dictionary<Object, Object> props = new Hashtable<Object, Object>();
ServiceRegistration registration = context.registerService(extensionPointType.getName(), extensionPoint, props);
registrations.put(extensionPointType, registration);
super.registerExtensionPoint(extensionPointType, extensionPoint, declaration);
}
@Override
protected void unregisterExtensionPoint(Class<?> i) {
ServiceRegistration registration = registrations.remove(i);
if (registration != null) {
try {
registration.unregister();
} catch (IllegalStateException e) {
// The service has been unregistered, ignore it
}
}
super.unregisterExtensionPoint(i);
}
@Override
public synchronized void stop() {
for (ServiceRegistration reg : registrations.values()) {
try {
ServiceReference ref = reg.getReference();
if (ref != null) {
reg.unregister();
}
} catch (IllegalStateException e) {
// Ignore it, the service has been unregistered when the owning bundle stops
}
}
registrations.clear();
super.stop();
}
}
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