org.android.activityminer.logic.timeseries
Class SensorObservationTask

java.lang.Object
  org.android.activityminer.logic.util.AbstractActivatableComponentImpl
      org.android.activityminer.logic.timeseries.SensorObservationTask

All Implemented Interfaces:

Runnable, TimerTask, ActivatableComponent

public final class SensorObservationTask
extends AbstractActivatableComponentImpl
implements TimerTask

This class does implement a runnable task to be executed delayed by an OS handler.

Every time this runnable is executed, it will post itself for another delayed execution according to the configured frequency. Each time the task is executed the sample taking method of the linked sensor scanner component is invoked. In case of delayed execution by the OS this task will calculate the optimal next execution time to stay in sync.

Field Summary

private long	frequency The execution time interval in milliseconds.
private long	initialDelay The initial delay.
private LooperThread	looperThread The looper thread with the handler to repost the task to, for delayed runnable execution.
private long	nextExpectedTime The last call time
private SensorScanner	sensorScanner The sensor observer.

Constructor Summary

SensorObservationTask(SensorScanner sensorScanner, LooperThread looperThread, long frequency, long initialDelay)
Constructor

Method Summary

long	getFrequency() Getter for the frequency
protected void	onActivationStateChange(boolean active) Handler for activation state changes
void	run()

Methods inherited from class org.android.activityminer.logic.util.AbstractActivatableComponentImpl

isActive, setActivationState

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.android.activityminer.logic.util.ActivatableComponent

isActive, setActivationState

Field Detail

sensorScanner

private final SensorScanner sensorScanner

The sensor observer.

looperThread

private final LooperThread looperThread

The looper thread with the handler to repost the task to, for delayed runnable execution.

frequency

private final long frequency

The execution time interval in milliseconds.

initialDelay

private final long initialDelay

The initial delay.

nextExpectedTime

private long nextExpectedTime

The last call time

Constructor Detail

SensorObservationTask

public SensorObservationTask(SensorScanner sensorScanner,
                             LooperThread looperThread,
                             long frequency,
                             long initialDelay)

Constructor

Parameters:

sensorScanner - the sensor scanner instance

looperThread - the looperThread with the handler to repost the task to for delayed runnable execution

frequency - the execution frequency in milliseconds

initialDelay - the initial delay

Method Detail

getFrequency

public final long getFrequency()

Description copied from interface: TimerTask

Getter for the frequency

Specified by:

getFrequency in interface TimerTask

Returns:

the frequency

run

public final void run()

Specified by:

run in interface Runnable

onActivationStateChange

protected final void onActivationStateChange(boolean active)

Description copied from class: AbstractActivatableComponentImpl

Handler for activation state changes

Specified by:

onActivationStateChange in class AbstractActivatableComponentImpl

Parameters:

active - the new activation state