acquire and release wakelock in the server

LocationService.java

    private void acquireWakeLock() {
        try {
            PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
            if (pm == null) {
                Ln.e("LocationService: Power manager not found!");
                return;
            }
            if (wakeLock == null) {
                wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, getPackageName());
                if (wakeLock == null) {
                    Ln.e("LocationService: Could not create wake lock (null).");
                    return;
                }
            }
            if (!wakeLock.isHeld()) {
                wakeLock.acquire();
                if (!wakeLock.isHeld()) {
                    Ln.e("LocationService: Could not acquire wake lock.");
                }
            }
        } catch (RuntimeException e) {
            Ln.e("LocationService: Caught unexpected exception: " + e.getMessage(), e);
        }
    }

    /**
     * Releases the wake lock if it's currently held.
     */
    private void releaseWakeLock() {
        if (wakeLock != null && wakeLock.isHeld()) {
            wakeLock.release();
            wakeLock = null;
        }
    }