mobile/android/base/sync/synchronizer/ConcurrentRecordConsumer.java@6474c204b198 (annotated)
mobile/android/base/sync/synchronizer/ConcurrentRecordConsumer.java
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 3 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 4 | |
| michael@0 | 5 | package org.mozilla.gecko.sync.synchronizer; |
| michael@0 | 6 | |
| michael@0 | 7 | import org.mozilla.gecko.background.common.log.Logger; |
| michael@0 | 8 | import org.mozilla.gecko.sync.repositories.domain.Record; |
| michael@0 | 9 | |
| michael@0 | 10 | /** |
| michael@0 | 11 | * Consume records from a queue inside a RecordsChannel, as fast as we can. |
| michael@0 | 12 | * TODO: rewrite this in terms of an ExecutorService and a CompletionService. |
| michael@0 | 13 | * See Bug 713483. |
| michael@0 | 14 | * |
| michael@0 | 15 | * @author rnewman |
| michael@0 | 16 | * |
| michael@0 | 17 | */ |
| michael@0 | 18 | class ConcurrentRecordConsumer extends RecordConsumer { |
| michael@0 | 19 | private static final String LOG_TAG = "CRecordConsumer"; |
| michael@0 | 20 | |
| michael@0 | 21 | /** |
| michael@0 | 22 | * When this is true and all records have been processed, the consumer |
| michael@0 | 23 | * will notify its delegate. |
| michael@0 | 24 | */ |
| michael@0 | 25 | protected boolean allRecordsQueued = false; |
| michael@0 | 26 | private long counter = 0; |
| michael@0 | 27 | |
| michael@0 | 28 | public ConcurrentRecordConsumer(RecordsConsumerDelegate delegate) { |
| michael@0 | 29 | this.delegate = delegate; |
| michael@0 | 30 | } |
| michael@0 | 31 | |
| michael@0 | 32 | private Object monitor = new Object(); |
| michael@0 | 33 | @Override |
| michael@0 | 34 | public void doNotify() { |
| michael@0 | 35 | synchronized (monitor) { |
| michael@0 | 36 | monitor.notify(); |
| michael@0 | 37 | } |
| michael@0 | 38 | } |
| michael@0 | 39 | |
| michael@0 | 40 | @Override |
| michael@0 | 41 | public void queueFilled() { |
| michael@0 | 42 | Logger.debug(LOG_TAG, "Queue filled."); |
| michael@0 | 43 | synchronized (monitor) { |
| michael@0 | 44 | this.allRecordsQueued = true; |
| michael@0 | 45 | monitor.notify(); |
| michael@0 | 46 | } |
| michael@0 | 47 | } |
| michael@0 | 48 | |
| michael@0 | 49 | @Override |
| michael@0 | 50 | public void halt() { |
| michael@0 | 51 | synchronized (monitor) { |
| michael@0 | 52 | this.stopImmediately = true; |
| michael@0 | 53 | monitor.notify(); |
| michael@0 | 54 | } |
| michael@0 | 55 | } |
| michael@0 | 56 | |
| michael@0 | 57 | private Object countMonitor = new Object(); |
| michael@0 | 58 | @Override |
| michael@0 | 59 | public void stored() { |
| michael@0 | 60 | Logger.trace(LOG_TAG, "Record stored. Notifying."); |
| michael@0 | 61 | synchronized (countMonitor) { |
| michael@0 | 62 | counter++; |
| michael@0 | 63 | } |
| michael@0 | 64 | } |
| michael@0 | 65 | |
| michael@0 | 66 | private void consumerIsDone() { |
| michael@0 | 67 | Logger.debug(LOG_TAG, "Consumer is done. Processed " + counter + ((counter == 1) ? " record." : " records.")); |
| michael@0 | 68 | delegate.consumerIsDone(!allRecordsQueued); |
| michael@0 | 69 | } |
| michael@0 | 70 | |
| michael@0 | 71 | @Override |
| michael@0 | 72 | public void run() { |
| michael@0 | 73 | Record record; |
| michael@0 | 74 | |
| michael@0 | 75 | while (true) { |
| michael@0 | 76 | // The queue is concurrent-safe. |
| michael@0 | 77 | while ((record = delegate.getQueue().poll()) != null) { |
| michael@0 | 78 | synchronized (monitor) { |
| michael@0 | 79 | Logger.trace(LOG_TAG, "run() took monitor."); |
| michael@0 | 80 | if (stopImmediately) { |
| michael@0 | 81 | Logger.debug(LOG_TAG, "Stopping immediately. Clearing queue."); |
| michael@0 | 82 | delegate.getQueue().clear(); |
| michael@0 | 83 | Logger.debug(LOG_TAG, "Notifying consumer."); |
| michael@0 | 84 | consumerIsDone(); |
| michael@0 | 85 | return; |
| michael@0 | 86 | } |
| michael@0 | 87 | Logger.debug(LOG_TAG, "run() dropped monitor."); |
| michael@0 | 88 | } |
| michael@0 | 89 | |
| michael@0 | 90 | Logger.trace(LOG_TAG, "Storing record with guid " + record.guid + "."); |
| michael@0 | 91 | try { |
| michael@0 | 92 | delegate.store(record); |
| michael@0 | 93 | } catch (Exception e) { |
| michael@0 | 94 | // TODO: Bug 709371: track records that failed to apply. |
| michael@0 | 95 | Logger.error(LOG_TAG, "Caught error in store.", e); |
| michael@0 | 96 | } |
| michael@0 | 97 | Logger.trace(LOG_TAG, "Done with record."); |
| michael@0 | 98 | } |
| michael@0 | 99 | synchronized (monitor) { |
| michael@0 | 100 | Logger.trace(LOG_TAG, "run() took monitor."); |
| michael@0 | 101 | |
| michael@0 | 102 | if (allRecordsQueued) { |
| michael@0 | 103 | Logger.debug(LOG_TAG, "Done with records and no more to come. Notifying consumerIsDone."); |
| michael@0 | 104 | consumerIsDone(); |
| michael@0 | 105 | return; |
| michael@0 | 106 | } |
| michael@0 | 107 | if (stopImmediately) { |
| michael@0 | 108 | Logger.debug(LOG_TAG, "Done with records and told to stop immediately. Notifying consumerIsDone."); |
| michael@0 | 109 | consumerIsDone(); |
| michael@0 | 110 | return; |
| michael@0 | 111 | } |
| michael@0 | 112 | try { |
| michael@0 | 113 | Logger.debug(LOG_TAG, "Not told to stop but no records. Waiting."); |
| michael@0 | 114 | monitor.wait(10000); |
| michael@0 | 115 | } catch (InterruptedException e) { |
| michael@0 | 116 | // TODO |
| michael@0 | 117 | } |
| michael@0 | 118 | Logger.trace(LOG_TAG, "run() dropped monitor."); |
| michael@0 | 119 | } |
| michael@0 | 120 | } |
| michael@0 | 121 | } |
| michael@0 | 122 | } |
