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Commit c8183ef0 authored by Wei Liu's avatar Wei Liu Committed by Android Git Automerger
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am 775a7780: am 0adc5f37: am 83467228: am 6f6326bc: Implement a exponential... 

am 775a7780: am 0adc5f37: am 83467228: am 6f6326bc: Implement a exponential backoff for NTP time and XTRA data retry.

* commit '775a7780':
  Implement a exponential backoff for NTP time and XTRA data retry.
parents 7774f21c 775a7780

services/core/java/com/android/server/location/GpsLocationProvider.java

+43 −2
Original line number Diff line number Diff line
@@ -281,8 +281,16 @@ public class GpsLocationProvider implements LocationProviderInterface { 
    // current setting 24 hours

    private static final long NTP_INTERVAL = 24*60*60*1000;

    // how long to wait if we have a network error in NTP or XTRA downloading

    // the initial value of the exponential backoff

    // current setting - 5 minutes

    private static final long RETRY_INTERVAL = 5*60*1000;

    // how long to wait if we have a network error in NTP or XTRA downloading

    // the max value of the exponential backoff

    // current setting - 4 hours

    private static final long MAX_RETRY_INTERVAL = 4*60*60*1000;



    private BackOff mNtpBackOff = new BackOff(RETRY_INTERVAL, MAX_RETRY_INTERVAL);

    private BackOff mXtraBackOff = new BackOff(RETRY_INTERVAL, MAX_RETRY_INTERVAL);



    // true if we are enabled, protected by this

    private boolean mEnabled;
@@ -832,9 +840,10 @@ public class GpsLocationProvider implements LocationProviderInterface { 


                    native_inject_time(time, timeReference, (int) certainty);

                    delay = NTP_INTERVAL;

                    mNtpBackOff.reset();

                } else {

                    if (DEBUG) Log.d(TAG, "requestTime failed");

                    delay = RETRY_INTERVAL;

                    delay = mNtpBackOff.nextBackoffMillis();

                }



                sendMessage(INJECT_NTP_TIME_FINISHED, 0, null);
@@ -875,6 +884,7 @@ public class GpsLocationProvider implements LocationProviderInterface { 
                        Log.d(TAG, "calling native_inject_xtra_data");

                    }

                    native_inject_xtra_data(data, data.length);

                    mXtraBackOff.reset();

                }



                sendMessage(DOWNLOAD_XTRA_DATA_FINISHED, 0, null);
@@ -882,7 +892,8 @@ public class GpsLocationProvider implements LocationProviderInterface { 
                if (data == null) {

                    // try again later

                    // since this is delayed and not urgent we do not hold a wake lock here

                    mHandler.sendEmptyMessageDelayed(DOWNLOAD_XTRA_DATA, RETRY_INTERVAL);

                    mHandler.sendEmptyMessageDelayed(DOWNLOAD_XTRA_DATA,

                            mXtraBackOff.nextBackoffMillis());

                }



                // release wake lock held by task
@@ -2190,6 +2201,36 @@ public class GpsLocationProvider implements LocationProviderInterface { 
        pw.append(s);

    }



    /**

     * A simple implementation of exponential backoff.

     */

    private static final class BackOff {

        private static final int MULTIPLIER = 2;

        private final long mInitIntervalMillis;

        private final long mMaxIntervalMillis;

        private long mCurrentIntervalMillis;



        public BackOff(long initIntervalMillis, long maxIntervalMillis) {

            mInitIntervalMillis = initIntervalMillis;

            mMaxIntervalMillis = maxIntervalMillis;



            mCurrentIntervalMillis = mInitIntervalMillis / MULTIPLIER;

        }



        public long nextBackoffMillis() {

            if (mCurrentIntervalMillis > mMaxIntervalMillis) {

                return mMaxIntervalMillis;

            }



            mCurrentIntervalMillis *= MULTIPLIER;

            return mCurrentIntervalMillis;

        }



        public void reset() {

            mCurrentIntervalMillis = mInitIntervalMillis / MULTIPLIER;

        }

    }



    // for GPS SV statistics

    private static final int MAX_SVS = 32;

    private static final int EPHEMERIS_MASK = 0;