/*
* Copyright (C) 2012, Katy Hilgenberg.
* Special acknowledgments to: Knowledge & Data Engineering Group, University of Kassel (http://www.kde.cs.uni-kassel.de).
* Contact: sdcf@cs.uni-kassel.de
*
* This file is part of the SDCFramework (Sensor Data Collection Framework) project.
*
* The SDCFramework is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The SDCFramework is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the SDCFramework. If not, see <http://www.gnu.org/licenses/>.
*/
package de.unikassel.android.sdcframework.devices;
import java.security.InvalidParameterException;
import android.os.Handler;
/**
* This class does implement a runnable task to be executed delayed by an OS
* handler in the service context. <br/>
* <br/>
* Every time this runnable is executed, it will post itself for another delayed
* execution using the current configured frequency. Further more, each time it
* is executed the linked scanner is invoked to take a sample from its
* associated device.
*
* @see SampleTakingDeviceScanner
* @author Katy Hilgenberg
*
*/
public final class SampleTakingTask implements Runnable
{
/**
* The scanner taking the samples on runnable execution
*/
private final SampleTakingDeviceScanner scanner;
/**
* The handler to repost the task to for delayed runnable execution
*/
private final Handler handler;
/**
* Constructor
*
* @param scanner
* the scanner taking the samples on runnable execution
* @param handler
* the handler to repost the task to for delayed runnable execution
*/
public SampleTakingTask( SampleTakingDeviceScanner scanner, Handler handler )
{
super();
if ( scanner == null )
throw new InvalidParameterException( "scanner is null" );
if ( handler == null )
throw new InvalidParameterException( "handler is null" );
this.scanner = scanner;
this.handler = handler;
}
/*
* (non-Javadoc)
*
* @see java.lang.Runnable#run()
*/
@Override
public final void run()
{
// restart timed task first
if ( scanner.isEnabled() )
{
int frequency = scanner.getDevice().getConfiguration().getFrequency();
handler.postDelayed( this, frequency );
// take a sample
scanner.takeSample();
}
}
}