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/*
 * 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.
 */

/*
 * JBoss, Home of Professional Open Source
 * Copyright 2013, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ServiceLoader;
import javax.batch.operations.BatchRuntimeException;
import javax.batch.operations.JobOperator;

/**
 * BatchRuntime represents the JSR 352 Batch Runtime.
 * It provides factory access to the JobOperator interface.
 */
public class BatchRuntime {
    /**
     * The getJobOperator factory method returns
     * an instance of the JobOperator interface.
     *
     * @return JobOperator instance.
     */
    public static JobOperator getJobOperator() {
        JobOperator jobOperator = null;
        if (System.getSecurityManager() == null) {
            for(JobOperator op : ServiceLoader.load(JobOperator.class)) {
                jobOperator = op;
                break;
            }
        } else {
            jobOperator = AccessController.doPrivileged(new PrivilegedAction() {
                public JobOperator run() {
                    for (JobOperator op : ServiceLoader.load(JobOperator.class)) {
                        return op;
                    }
                    return null;
                }
            });
        }

        if (jobOperator == null) {
            throw new BatchRuntimeException("The ServiceLoader was unable to find an implemenation for JobOperator. Check classpath for META-INF/services/javax.batch.operations.JobOperator file.");
        }
        return jobOperator;
    }
}