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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.implementation.osgi.invocation;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Hashtable;
import java.util.List;
import java.util.Random;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;
import org.apache.tuscany.sca.assembly.ComponentService;
import org.apache.tuscany.sca.core.context.InstanceWrapper;
import org.apache.tuscany.sca.core.scope.Scope;
import org.apache.tuscany.sca.core.scope.TargetDestructionException;
import org.apache.tuscany.sca.core.scope.TargetInitializationException;
import org.apache.tuscany.sca.interfacedef.Interface;
import org.apache.tuscany.sca.runtime.EndpointReference;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
/**
* InstanceWrapper for creating instances for OSGi components.
* This class needs to implement InstanceWrapper since the wrapper is stored in
* the scope container. But getInstance() is called on this wrapper only through the
* OSGi target invoker. OSGiTargetInvoker always invokes getInstance for a specific
* service since one OSGi SCA component can associate different objects with
* different services (this is different from Java SCA components which always associate
* a single component instance with multiple services).
*
*/
public class OSGiInstanceWrapper<T> implements InstanceWrapper<T> {
private OSGiImplementationProvider provider;
private BundleContext bundleContext;
private Hashtable<Object,InstanceInfo<T>> instanceInfoList =
new Hashtable<Object,InstanceInfo<T>>();
public OSGiInstanceWrapper(OSGiImplementationProvider provider,
BundleContext bundleContext) {
this.provider = provider;
this.bundleContext = bundleContext;
}
public synchronized T getInstance(ComponentService service) throws TargetInitializationException {
if (instanceInfoList.get(service) != null)
return instanceInfoList.get(service).osgiInstance;
Bundle refBundle = provider.startBundle();
if (!provider.getImplementation().getScope().equals(Scope.COMPOSITE)) {
refBundle = getDummyReferenceBundle();
}
InstanceInfo<T> instanceInfo = new InstanceInfo<T>();
instanceInfoList.put(service, instanceInfo);
instanceInfo.osgiServiceReference = provider.getOSGiServiceReference(service);
instanceInfo.refBundleContext = refBundle.getBundleContext();
instanceInfo.osgiInstance = (T)instanceInfo.refBundleContext.getService(instanceInfo.osgiServiceReference);
provider.injectProperties(instanceInfo.osgiInstance);
return instanceInfo.osgiInstance;
}
public synchronized T getCallbackInstance(EndpointReference from, Interface callbackInterface)
throws TargetInitializationException {
if (instanceInfoList.get(callbackInterface) != null)
return instanceInfoList.get(callbackInterface).osgiInstance;
Bundle refBundle = provider.startBundle();
if (!provider.getImplementation().getScope().equals(Scope.COMPOSITE)) {
refBundle = getDummyReferenceBundle();
}
InstanceInfo<T> instanceInfo = new InstanceInfo<T>();
instanceInfoList.put(callbackInterface, instanceInfo);
instanceInfo.osgiServiceReference = provider.getOSGiServiceReference(from, callbackInterface);
instanceInfo.refBundleContext = refBundle.getBundleContext();
instanceInfo.osgiInstance = (T)instanceInfo.refBundleContext.getService(instanceInfo.osgiServiceReference);
return instanceInfo.osgiInstance;
}
// This method is provided purely to implement InstanceWrapper interface, and is never called.
public T getInstance() {
return null;
}
public void start() throws TargetInitializationException {
if (provider.isEagerInit()) {
List<ComponentService> services = provider.getRuntimeComponent().getServices();
for (ComponentService service : services) {
getInstance(service);
}
}
}
public synchronized void stop() throws TargetDestructionException {
for (InstanceInfo<T> instanceInfo : instanceInfoList.values()) {
if (instanceInfo.osgiInstance != null && instanceInfo.osgiServiceReference != null) {
instanceInfo.refBundleContext.ungetService(instanceInfo.osgiServiceReference);
instanceInfo.osgiInstance = null;
instanceInfo.osgiServiceReference = null;
try {
if (instanceInfo.dummyBundle != null) {
instanceInfo.dummyBundle.uninstall();
}
} catch (Exception e) {
throw new TargetDestructionException(e);
}
}
}
instanceInfoList.clear();
}
private Bundle getDummyReferenceBundle() throws TargetInitializationException {
Bundle dummyBundle = null;
ByteArrayOutputStream out = new ByteArrayOutputStream();
String EOL = System.getProperty("line.separator");
String bundleName = "dummy.sca." + new Random().nextInt();
String manifestStr = "Manifest-Version: 1.0" + EOL +
"Bundle-ManifestVersion: 2" + EOL +
"Bundle-Name: " + bundleName + EOL +
"Bundle-SymbolicName: " + bundleName + EOL +
"Bundle-Version: " + "1.0.0" + EOL +
"Bundle-Localization: plugin" + EOL;
StringBuilder manifestBuf = new StringBuilder();
manifestBuf.append(manifestStr);
try {
ByteArrayInputStream manifestStream = new ByteArrayInputStream(manifestBuf.toString().getBytes());
Manifest manifest = new Manifest();
manifest.read(manifestStream);
JarOutputStream jarOut = new JarOutputStream(out, manifest);
jarOut.close();
out.close();
ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
dummyBundle = bundleContext.installBundle("file://" + bundleName + ".jar", in);
dummyBundle.start();
} catch (Exception e) {
throw new TargetInitializationException(e);
}
return dummyBundle;
}
private static class InstanceInfo<T> {
private T osgiInstance;
private ServiceReference osgiServiceReference;
private Bundle dummyBundle;
private BundleContext refBundleContext;
}
}
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