/*
 * Copyright 2006-2007 the original author or authors.
 *
 * 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 org.springframework.batch.core.step;

import org.springframework.batch.core.StepExecution;

/**
 * Strategy for blocking while a step execution is being updated.
 *  
 * @author Dave Syer
 *
 */
public interface StepExecutionSynchronizer {

	/**
	 * Lock the step execution, blocking if it has been locked by another thread.
	 * 
	 * @param stepExecution the {@link StepExecution} that is in progress
	 * @throws InterruptedException if the thread is interrupted while waiting
	 */
	void lock(StepExecution stepExecution) throws InterruptedException;

	/**
	 * Release the lock.  Use this in a finally block.
	 * 
	 * @param stepExecution
	 */
	void release(StepExecution stepExecution);

}
