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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 supplychain;
import java.lang.reflect.Field;
import java.util.Hashtable;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceEvent;
import org.osgi.framework.ServiceListener;
import org.osgi.framework.ServiceReference;
/**
* Common code for all OSGi bundles which don't use declarative services.
* Registers services and sets references.
*/
public class OSGiBundleImpl implements ServiceListener, BundleActivator {
String name;
String serviceName;
String[] references;
Class<?>[] referenceClasses;
Field[] referenceFields;
Class myClass;
private BundleContext bundleContext;
public OSGiBundleImpl(String serviceName, String... references) {
myClass = this.getClass();
this.name = this.getClass().getSimpleName();
this.serviceName = serviceName;
this.references = references;
try {
referenceClasses = new Class[references.length];
referenceFields = new Field[references.length];
for (int i = 0; i < references.length; i++) {
referenceFields[i] = this.getClass().getDeclaredField(references[i]);
referenceFields[i].setAccessible(true);
referenceClasses[i] = referenceFields[i].getType();
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public void start(BundleContext bc) {
System.out.println("Started OSGi bundle with activator " + name);
this.bundleContext = bc;
bundleContext.registerService(serviceName, this, new Hashtable());
for (int i = 0; i < references.length; i++) {
try {
ServiceReference ref = bundleContext.getServiceReference(referenceClasses[i].getName());
if (ref != null) {
Object obj = bundleContext.getService(ref);
referenceFields[i].set(this, referenceClasses[i].cast(obj));
} else {
String filter = "(objectclass=" + referenceClasses[i].getName() + ")";
this.bundleContext.addServiceListener(this, filter);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
public void stop(BundleContext bc) {
System.out.println("Stop OSGi bundle with activator " + name);
}
public void serviceChanged(ServiceEvent event) {
try {
if (event.getType() == ServiceEvent.REGISTERED) {
ServiceReference ref = event.getServiceReference();
Object obj = bundleContext.getService(ref);
for (int i = 0; i < references.length; i++) {
if (referenceClasses[i].isAssignableFrom(obj.getClass())) {
referenceFields[i].set(this, referenceClasses[i].cast(obj));
}
}
}
} catch (Throwable e) {
e.printStackTrace();
}
}
}
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