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POCorrect pattern to acquire a WakeLock in a BroadcastReceiver and release it in a Service
 

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  1. POCorrect pattern to acquire a WakeLock in a BroadcastReceiver and release it in a Service
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    <p>Even after a lot of research I am still not completely sure if the way how I implement a <code>WakeLock</code> for a <code>Service</code> started by a <code>BroadcastReceiver</code> is correct - even though it seems to work fine. The broadcast receiver gets intents sent to it from an alarm, so to start with, from the API docs of <code>AlarmManager</code>:</p> <blockquote> <p>If your alarm receiver called Context.startService(), it is possible that the phone will sleep before the requested service is launched. To prevent this, your BroadcastReceiver and Service will need to implement a separate wake lock policy to ensure that the phone continues running until the service becomes available.</p> </blockquote> <p>So, in <code>onReceive()</code> I do:</p> <pre><code> Intent serviceIntent = new Intent(context, SomeService.class); context.startService(serviceIntent); if(SomeService.wakeLock == null) { PowerManager powerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE); SomeService.wakeLock = powerManager.newWakeLock( PowerManager.PARTIAL_WAKE_LOCK, SomeService.WAKE_LOCK_TAG); } if(! SomeService.wakeLock.isHeld()) { SomeService.wakeLock.acquire(); } </code></pre> <p>and in the service I do:</p> <pre><code> try { // Do some work } finally { if(wakeLock != null) { if(wakeLock.isHeld()) { wakeLock.release(); } wakeLock = null; } } </code></pre> <p>The <code>SomeService.wakeLock</code>field is package private, static and volatile.</p> <p>What I am unsure about is the check using <code>isHeld()</code> - does it really tell me if a <code>WakeLock</code> is acquired or not, and do I need to do this check at all?</p>
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