javax.batch.runtime.BatchRuntime Maven / Gradle / Ivy
/*
* Copyright 2012 International Business Machines Corp.
*
* See the NOTICE file distributed with this work for additional information
* regarding copyright ownership. 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 javax.batch.runtime;
import java.util.ServiceLoader;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.batch.operations.JobOperator;
public class BatchRuntime {
private final static String sourceClass = BatchRuntime.class.getName();
private final static Logger logger = Logger.getLogger(sourceClass);
/**
* The getJobOperator factory method returns
* an instance of the JobOperator interface.
* Repeated calls to this method returns the
* same instance.
* @return JobOperator instance.
*/
public static JobOperator getJobOperator() {
JobOperator operator = null;
ServiceLoader loader = ServiceLoader.load(JobOperator.class);
for (JobOperator provider : loader) {
if (provider != null) {
if (logger.isLoggable(Level.FINE)) {
logger.fine("Loaded BatchContainerServiceProvider with className = " + provider.getClass().getCanonicalName());
}
// Use first one
operator = provider;
break;
}
}
if (operator == null) {
if (logger.isLoggable(Level.WARNING)) {
logger.warning("The ServiceLoader was unable to find an implemenation for JobOperator. Check classpath for META-INF/services/javax.batch.operations.JobOperator file.");
}
}
return operator;
}
}