com.hazelcast.osgi.impl.Activator Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2021, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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 com.hazelcast.osgi.impl;
import com.hazelcast.logging.ILogger;
import com.hazelcast.logging.Logger;
import com.hazelcast.osgi.HazelcastOSGiService;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import java.lang.reflect.Method;
/**
* Hazelcast OSGi bundle activator.
*
* @see org.osgi.framework.BundleActivator
*/
public class Activator
implements BundleActivator {
private static final ILogger LOGGER = Logger.getLogger(Activator.class);
// Defined as `volatile` since Javadoc of `BundleActivator` says that
// `The Framework must not concurrently call a BundleActivator object`
// and also it is marked as `@NotThreadSafe`.
// So it can be called from different threads but cannot be called concurrently.
private volatile HazelcastInternalOSGiService hazelcastOSGiService;
@Override
public void start(BundleContext context)
throws Exception {
// Try to start javax.scripting - JSR 223
activateJavaxScripting(context);
assert hazelcastOSGiService == null : "Hazelcast OSGI service should be null while starting!";
// Create a new Hazelcast OSGI service with given bundle and its context
hazelcastOSGiService = new HazelcastOSGiServiceImpl(context.getBundle());
// Activate new created Hazelcast OSGI service
hazelcastOSGiService.activate();
}
@Override
public void stop(BundleContext context)
throws Exception {
assert hazelcastOSGiService != null : "Hazelcast OSGI service should not be null while stopping!";
hazelcastOSGiService.deactivate();
hazelcastOSGiService = null;
}
private void activateJavaxScripting(BundleContext context)
throws Exception {
if (isJavaxScriptingAvailable()) {
Class clazz = context.getBundle().loadClass("com.hazelcast.osgi.impl.ScriptEngineActivator");
Method register = clazz.getDeclaredMethod("registerOsgiScriptEngineManager", BundleContext.class);
register.setAccessible(true);
register.invoke(clazz, context);
} else {
LOGGER.warning("javax.scripting is not available, scripts from Management Center cannot be executed!");
}
}
static boolean isJavaxScriptingAvailable() {
if (Boolean.getBoolean(HazelcastOSGiService.HAZELCAST_OSGI_JSR223_DISABLED)) {
return false;
}
try {
Class.forName("javax.script.ScriptEngineManager");
return true;
} catch (ClassNotFoundException e) {
return false;
}
}
}