1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mobile/android/base/sync/PrefsBackoffHandler.java Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,59 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +package org.mozilla.gecko.sync;
1.9 +
1.10 +import android.content.SharedPreferences;
1.11 +import android.content.SharedPreferences.Editor;
1.12 +
1.13 +public class PrefsBackoffHandler implements BackoffHandler {
1.14 + public static final String PREF_EARLIEST_NEXT = "earliestnext";
1.15 +
1.16 + private final SharedPreferences prefs;
1.17 + private final String prefEarliest;
1.18 +
1.19 + public PrefsBackoffHandler(final SharedPreferences prefs, final String prefSuffix) {
1.20 + if (prefs == null) {
1.21 + throw new IllegalArgumentException("prefs must not be null.");
1.22 + }
1.23 + this.prefs = prefs;
1.24 + this.prefEarliest = PREF_EARLIEST_NEXT + "." + prefSuffix;
1.25 + }
1.26 +
1.27 + @Override
1.28 + public synchronized long getEarliestNextRequest() {
1.29 + return prefs.getLong(prefEarliest, 0);
1.30 + }
1.31 +
1.32 + @Override
1.33 + public synchronized void setEarliestNextRequest(final long next) {
1.34 + final Editor edit = prefs.edit();
1.35 + edit.putLong(prefEarliest, next);
1.36 + edit.commit();
1.37 + }
1.38 +
1.39 + @Override
1.40 + public synchronized void extendEarliestNextRequest(final long next) {
1.41 + if (prefs.getLong(prefEarliest, 0) >= next) {
1.42 + return;
1.43 + }
1.44 + final Editor edit = prefs.edit();
1.45 + edit.putLong(prefEarliest, next);
1.46 + edit.commit();
1.47 + }
1.48 +
1.49 + /**
1.50 + * Return the number of milliseconds until we're allowed to touch the server again,
1.51 + * or 0 if now is fine.
1.52 + */
1.53 + @Override
1.54 + public long delayMilliseconds() {
1.55 + long earliestNextRequest = getEarliestNextRequest();
1.56 + if (earliestNextRequest <= 0) {
1.57 + return 0;
1.58 + }
1.59 + long now = System.currentTimeMillis();
1.60 + return Math.max(0, earliestNextRequest - now);
1.61 + }
1.62 +}
1.63 \ No newline at end of file
