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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.sync;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
public class PrefsBackoffHandler implements BackoffHandler {
public static final String PREF_EARLIEST_NEXT = "earliestnext";
private final SharedPreferences prefs;
private final String prefEarliest;
public PrefsBackoffHandler(final SharedPreferences prefs, final String prefSuffix) {
if (prefs == null) {
throw new IllegalArgumentException("prefs must not be null.");
}
this.prefs = prefs;
this.prefEarliest = PREF_EARLIEST_NEXT + "." + prefSuffix;
}
@Override
public synchronized long getEarliestNextRequest() {
return prefs.getLong(prefEarliest, 0);
}
@Override
public synchronized void setEarliestNextRequest(final long next) {
final Editor edit = prefs.edit();
edit.putLong(prefEarliest, next);
edit.commit();
}
@Override
public synchronized void extendEarliestNextRequest(final long next) {
if (prefs.getLong(prefEarliest, 0) >= next) {
return;
}
final Editor edit = prefs.edit();
edit.putLong(prefEarliest, next);
edit.commit();
}
/**
* Return the number of milliseconds until we're allowed to touch the server again,
* or 0 if now is fine.
*/
@Override
public long delayMilliseconds() {
long earliestNextRequest = getEarliestNextRequest();
if (earliestNextRequest <= 0) {
return 0;
}
long now = System.currentTimeMillis();
return Math.max(0, earliestNextRequest - now);
}
}
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