/**
    * Copyright 2005-2011 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.rice.kew.lifecycle;
  
  import org.kuali.rice.core.api.config.property.ConfigContext;
  import org.kuali.rice.core.api.lifecycle.BaseLifecycle;
  import org.kuali.rice.core.api.lifecycle.BaseLifecycle;
  import org.kuali.rice.kew.batch.XmlPollerService;
  import org.kuali.rice.kew.service.KEWServiceLocator;
  
  import java.util.concurrent.Executors;
  import java.util.concurrent.ScheduledExecutorService;
  import java.util.concurrent.ScheduledFuture;
  import java.util.concurrent.TimeUnit;
  
  public class XmlPipelineLifeCycle extends BaseLifecycle {
  
  	protected final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(XmlPipelineLifeCycle.class);
  
  	private ScheduledExecutorService scheduledExecutor;
  	private ScheduledFuture future;
  
  	public void start() throws Exception {
  		LOG.info("Configuring XML ingestion pipeline...");
  		scheduledExecutor = Executors.newScheduledThreadPool(1);
  		final XmlPollerService xmlPoller = KEWServiceLocator.getXmlPollerService();
  		LOG.info("Starting XML data loader.  Polling at " + xmlPoller.getPollIntervalSecs() + "-second intervals");
  		if (!ConfigContext.getCurrentContextConfig().getDevMode()) {
  			future = scheduledExecutor.scheduleWithFixedDelay(xmlPoller, xmlPoller.getInitialDelaySecs(), xmlPoller.getPollIntervalSecs(), TimeUnit.SECONDS);
  			super.start();
  		}
  	}
  
  	public void stop() throws Exception {
  		if (isStarted()) {
  			LOG.warn("Shutting down XML file polling timer");
  			try {
  				if (future != null) {
  					if (!future.cancel(false)) {
  						LOG.warn("Failed to cancel the XML Poller service.");
  					}
  					future = null;
  				}
  				if (scheduledExecutor != null) {
  					scheduledExecutor.shutdownNow();
  					scheduledExecutor = null;
  				}
  			} finally {
  				super.stop();
  			}
  		}
  	}
  
  }