/*

  * This software is licensed under the Apache License, Version 2.0

  * (the "License") agreement; 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 net.admin4j.timer;

 import java.util.Collection;

 import net.admin4j.deps.commons.lang3.Validate;

 import net.admin4j.util.Admin4jRuntimeException;

 /**

  * Basic TaskTimer implementation.

  * @author D. Ashmore

  * @since 1.0

  */

 public class BasicTaskTimer implements TaskTimer {

     private static final long serialVersionUID = -6898638441458870161L;

     private Collection<DataMeasure> dataMeasures;

     private ThreadLocal<Long> beginTime = new ThreadLocal<Long>();

     private String label;

     public BasicTaskTimer(String label, Collection<DataMeasure> dataMeasures) {

         Validate.notNull(dataMeasures, "Null data measure collection not allowed.");

         Validate.notEmpty(label, "Null or blank label not allowed.");

         this.dataMeasures = dataMeasures;

         this.label = label;

     }

     /* (non-Javadoc)

      * @see net.admin4j.timer.TaskTimer#stop()

      */

     public void stop() {

         Long bTime = this.beginTime.get();

         if (bTime == null) {

             throw new Admin4jRuntimeException("Can't call stop() on a timer that hasn't been started.");            

         }

         Long timing = System.currentTimeMillis() - bTime;

         for (DataMeasure measure: this.dataMeasures) {

             measure.addNumber(timing);

         }

     }

     /* (non-Javadoc)

      * @see net.admin4j.timer.TaskTimer#start()

      */

     public void start() {

        this.beginTime.set(System.currentTimeMillis());

     }

     /* (non-Javadoc)

      * @see net.admin4j.timer.TaskTimer#getLabel()

      */

     public String getLabel() {

         return label;

     }

     public Collection<DataMeasure> getDataMeasures() {

         return dataMeasures;

     }

     protected Long getBeginTime() {

         return this.beginTime.get();

     }

 }