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Acquire wake lock with a timeout.

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akwizgran
2018-05-14 16:47:47 +01:00
parent 74cfd313ab
commit 4f732c3997
1 changed files with 13 additions and 8 deletions
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21
bramble-android/src/main/java/org/briarproject/bramble/util/RenewableWakeLock.java
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@@ -7,6 +7,7 @@ import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit; import java.util.concurrent.TimeUnit;
import java.util.logging.Logger; import java.util.logging.Logger;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.logging.Level.INFO; import static java.util.logging.Level.INFO;
public class RenewableWakeLock { public class RenewableWakeLock {
@@ -14,12 +15,17 @@ public class RenewableWakeLock {
private static final Logger LOG = private static final Logger LOG =
Logger.getLogger(RenewableWakeLock.class.getName()); Logger.getLogger(RenewableWakeLock.class.getName());
/**
* Automatically release the lock this many milliseconds after it's due
* to have been replaced and released.
*/
private static final int SAFETY_MARGIN_MS = 10_000;
private final PowerManager powerManager; private final PowerManager powerManager;
private final ScheduledExecutorService scheduler; private final ScheduledExecutorService scheduler;
private final int levelAndFlags; private final int levelAndFlags;
private final String tag; private final String tag;
private final long duration; private final long durationMs;
private final TimeUnit timeUnit;
private final Runnable renewTask; private final Runnable renewTask;
private final Object lock = new Object(); private final Object lock = new Object();
@@ -33,8 +39,7 @@ public class RenewableWakeLock {
this.scheduler = scheduler; this.scheduler = scheduler;
this.levelAndFlags = levelAndFlags; this.levelAndFlags = levelAndFlags;
this.tag = tag; this.tag = tag;
this.duration = duration; durationMs = MILLISECONDS.convert(duration, timeUnit);
this.timeUnit = timeUnit;
renewTask = this::renew; renewTask = this::renew;
} }
@@ -47,8 +52,8 @@ public class RenewableWakeLock {
} }
wakeLock = powerManager.newWakeLock(levelAndFlags, tag); wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
wakeLock.setReferenceCounted(false); wakeLock.setReferenceCounted(false);
wakeLock.acquire(); wakeLock.acquire(durationMs + SAFETY_MARGIN_MS);
future = scheduler.schedule(renewTask, duration, timeUnit); future = scheduler.schedule(renewTask, durationMs, MILLISECONDS);
} }
} }
@@ -62,9 +67,9 @@ public class RenewableWakeLock {
PowerManager.WakeLock oldWakeLock = wakeLock; PowerManager.WakeLock oldWakeLock = wakeLock;
wakeLock = powerManager.newWakeLock(levelAndFlags, tag); wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
wakeLock.setReferenceCounted(false); wakeLock.setReferenceCounted(false);
wakeLock.acquire(); wakeLock.acquire(durationMs + SAFETY_MARGIN_MS);
oldWakeLock.release(); oldWakeLock.release();
future = scheduler.schedule(renewTask, duration, timeUnit); future = scheduler.schedule(renewTask, durationMs, MILLISECONDS);
} }
} }