org.apache.openjpa.persistence.osgi.BundleUtils Maven / Gradle / Ivy
/*
* 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 WARRANTIESOR 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.openjpa.persistence.osgi;
// DO NOT import any org.osgi packages or classes here!
/**
* OSGi helper class and methods.
* All routines MUST use reflection, so we don't have any hard-coded
* runtime depends on OSGi classes for Java SE and EE users.
*
* @version $Rev$ $Date$
*/
public class BundleUtils {
public static boolean runningUnderOSGi() {
try {
@SuppressWarnings("unused")
Class c = Class.forName("org.osgi.framework.Bundle");
c = Class.forName("org.osgi.framework.BundleActivator");
c = Class.forName("org.osgi.framework.BundleContext");
c = Class.forName("org.osgi.framework.ServiceRegistration");
return true;
} catch (ClassNotFoundException | NoClassDefFoundError e) {
// no-op - catch, eat and return false below
}
return false;
}
/* (non-Javadoc)
* OPENJPA-1491 Allow us to use the OSGi Bundle's ClassLoader instead of the application one.
* Uses reflection so we don't have any runtime depends on OSGi classes for Java SE and EE users.
*/
public static ClassLoader getBundleClassLoader() {
ClassLoader cl = null;
if (runningUnderOSGi()) {
try {
Class c = Class.forName("org.apache.openjpa.persistence.osgi.PersistenceActivator");
cl = (ClassLoader) c.getMethod("getBundleClassLoader").invoke(null);
} catch (Throwable t) {
// fail-fast
throw new RuntimeException(t);
}
}
return cl;
}
}