javax.batch.runtime.BatchRuntime 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 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 javax.batch.runtime;
import org.apache.geronimo.osgi.locator.ProviderLocator;
import javax.batch.operations.JobOperator;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Iterator;
import java.util.List;
import java.util.ServiceLoader;
public class BatchRuntime {
public static JobOperator getJobOperator() {
if (System.getSecurityManager() == null) {
return findJobOperator();
}
return AccessController.doPrivileged(new PrivilegedAction() {
public JobOperator run() {
return findJobOperator();
}
});
}
private static JobOperator findJobOperator() {
final Iterator iterator = operators();
while (iterator.hasNext()) {
final JobOperator provider = iterator.next();
if (provider != null) {
return provider;
}
}
return null;
}
private static Iterator operators() {
try {
return ((List) ProviderLocator.getService(JobOperator.class.getName(), JobOperator.class, Thread.currentThread().getContextClassLoader())).iterator();
} catch (final Throwable th) { // rarely case where potentially missing OSGi stuff
return ServiceLoader.load(JobOperator.class).iterator();
}
}
}