/*! ******************************************************************************
*
* Pentaho Data Integration
*
* Copyright (C) 2002-2013 by Pentaho : http://www.pentaho.com
*
*******************************************************************************
*
* 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.pentaho.di.ui.spoon.trans;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
/**
* A timer where you can attach a timer to. Once the time is up, the listeners are fired off.
*
* @author matt
*
*/
public class DelayTimer implements Runnable {
private int delayInMiliseconds;
private boolean stopped;
private List<DelayListener> delayListeners;
/**
* Default prolonger should not prolong delay.
*/
private Callable<Boolean> prolonger = new Callable<Boolean>() {
@Override
public Boolean call() throws Exception {
return false;
}
};
private long start;
public DelayTimer( int delayInMiliseconds ) {
this.delayInMiliseconds = delayInMiliseconds;
this.delayListeners = new ArrayList<DelayListener>();
stopped = false;
}
public DelayTimer( int delayInMilliseconds, DelayListener delayListener ) {
this( delayInMilliseconds );
addDelayListener( delayListener );
}
public DelayTimer( int delayInMilliseconds, DelayListener delayListener, Callable<Boolean> prolonger ) {
this( delayInMilliseconds, delayListener );
this.prolonger = prolonger;
}
public void reset() {
start = System.currentTimeMillis();
}
public void run() {
reset();
while ( ( delayNotExpired() || needProlong() ) && !stopped ) {
try {
Thread.sleep( 25 );
} catch ( InterruptedException e ) {
// Simply break out of the loop, nothing else
//
break;
}
}
// Fire the listeners...
//
for ( DelayListener delayListener : delayListeners ) {
delayListener.expired();
}
}
private boolean delayNotExpired() {
return ( System.currentTimeMillis() - start ) < delayInMiliseconds;
}
private boolean needProlong() {
try {
return Boolean.valueOf( prolonger.call() );
} catch ( Exception e ) {
throw new RuntimeException( "Prolonger call finished with error", e );
}
}
public void stop() {
stopped = true;
}
public void addDelayListener( DelayListener delayListener ) {
delayListeners.add( delayListener );
}
/**
* @return the delay in milliseconds
*/
public int getDelayInMilliseconds() {
return delayInMiliseconds;
}
/**
* @param delayInMilliseconds
* the delay in milliseconds to set
*/
public void setDelayInSeconds( int delayInMilliseconds ) {
this.delayInMiliseconds = delayInMilliseconds;
}
}