/*
    * 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.sample.common;
  
  import java.util.List;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.springframework.batch.core.StepExecution;
  import org.springframework.batch.core.StepExecutionListener;
  import org.springframework.batch.core.listener.StepExecutionListenerSupport;
  import org.springframework.batch.item.ItemWriter;
  
  /**
   * Simple module implementation that will always return true to indicate that
   * processing should continue. This is useful for testing graceful shutdown of
   * jobs.
   * 
   * @author Lucas Ward
   * 
   */
  public class InfiniteLoopWriter extends StepExecutionListenerSupport implements ItemWriter<Object> {
  
  	private StepExecution stepExecution;
  
  	private int count = 0;
  
  	private static final Log logger = LogFactory.getLog(InfiniteLoopWriter.class);
  
  	/**
  	 * @see StepExecutionListener#beforeStep(StepExecution)
  	 */
  	@Override
  	public void beforeStep(StepExecution stepExecution) {
  		this.stepExecution = stepExecution;
  	}
  
  	/**
  	 * 
  	 */
  	public InfiniteLoopWriter() {
  		super();
  	}
  
  	public void write(List<? extends Object> items) throws Exception {
  		try {
  			Thread.sleep(500);
  		}
  		catch (InterruptedException e) {
  			Thread.currentThread().interrupt();
  			throw new RuntimeException("Job interrupted.");
  		}
  		stepExecution.setWriteCount(++count);
  		logger.info("Executing infinite loop, at count=" + count);
  	}
  }