/**
    * Copyright 2010-2014 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.common.util.inform;
  
  import org.kuali.common.util.Assert;
  import org.kuali.common.util.log.LoggerUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * 
   */
  public final class StartStopInformer {
  
  	private static final Logger logger = LoggerFactory.getLogger(StartStopInformer.class);
  
  	private final Inform inform;
  
  	public StartStopInformer() {
  		this(Inform.DEFAULT_INFORM);
  	}
  
  	public StartStopInformer(Inform inform) {
  		Assert.noNulls(inform);
  		this.inform = inform;
  	}
  
  	private boolean started = false;
  
  	/**
  	 * Indicates if we are in the "started" state
  	 */
  	public boolean isStarted() {
  		return started;
  	}
  
  	/**
  	 * Make sure we haven't already been started. Set the started indicator to true. Log the start message. Print the start token.
  	 */
  	public synchronized void start() {
  		Assert.isFalse(started, "Already started");
  		this.started = true;
  		LoggerUtils.log(inform.getStartMessage(), logger);
  		inform.getPrintStream().print(inform.getStartToken());
  	}
  
  	/**
  	 * Make sure we haven't already been stopped. Set the started indicator to false. Print the stop token. Log the stop message.
  	 */
  	public synchronized void stop() {
  		Assert.isTrue(started, "Not started");
  		this.started = false;
  		inform.getPrintStream().print(inform.getCompleteToken());
  		LoggerUtils.log(inform.getStopMessage(), logger);
  	}
  
  	public Inform getInform() {
  		return inform;
  	}
  
  }