The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/mobile/android/base/sync/synchronizer/SerialRecordConsumer.java	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,131 @@
     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.synchronizer;
     1.9 +
    1.10 +import org.mozilla.gecko.background.common.log.Logger;
    1.11 +import org.mozilla.gecko.sync.repositories.domain.Record;
    1.12 +
    1.13 +/**
    1.14 + * Consume records from a queue inside a RecordsChannel, storing them serially.
    1.15 + * @author rnewman
    1.16 + *
    1.17 + */
    1.18 +class SerialRecordConsumer extends RecordConsumer {
    1.19 +  private static final String LOG_TAG = "SerialRecordConsumer";
    1.20 +  protected boolean stopEventually = false;
    1.21 +  private volatile long counter = 0;
    1.22 +
    1.23 +  public SerialRecordConsumer(RecordsConsumerDelegate delegate) {
    1.24 +    this.delegate = delegate;
    1.25 +  }
    1.26 +
    1.27 +  private Object monitor = new Object();
    1.28 +  @Override
    1.29 +  public void doNotify() {
    1.30 +    synchronized (monitor) {
    1.31 +      monitor.notify();
    1.32 +    }
    1.33 +  }
    1.34 +
    1.35 +  @Override
    1.36 +  public void queueFilled() {
    1.37 +    Logger.debug(LOG_TAG, "Queue filled.");
    1.38 +    synchronized (monitor) {
    1.39 +      this.stopEventually = true;
    1.40 +      monitor.notify();
    1.41 +    }
    1.42 +  }
    1.43 +
    1.44 +  @Override
    1.45 +  public void halt() {
    1.46 +    Logger.debug(LOG_TAG, "Halting.");
    1.47 +    synchronized (monitor) {
    1.48 +      this.stopEventually = true;
    1.49 +      this.stopImmediately = true;
    1.50 +      monitor.notify();
    1.51 +    }
    1.52 +  }
    1.53 +
    1.54 +  private Object storeSerializer = new Object();
    1.55 +  @Override
    1.56 +  public void stored() {
    1.57 +    Logger.debug(LOG_TAG, "Record stored. Notifying.");
    1.58 +    synchronized (storeSerializer) {
    1.59 +      Logger.debug(LOG_TAG, "stored() took storeSerializer.");
    1.60 +      counter++;
    1.61 +      storeSerializer.notify();
    1.62 +      Logger.debug(LOG_TAG, "stored() dropped storeSerializer.");
    1.63 +    }
    1.64 +  }
    1.65 +  private void storeSerially(Record record) {
    1.66 +    Logger.debug(LOG_TAG, "New record to store.");
    1.67 +    synchronized (storeSerializer) {
    1.68 +      Logger.debug(LOG_TAG, "storeSerially() took storeSerializer.");
    1.69 +      Logger.debug(LOG_TAG, "Storing...");
    1.70 +      try {
    1.71 +        this.delegate.store(record);
    1.72 +      } catch (Exception e) {
    1.73 +        Logger.warn(LOG_TAG, "Got exception in store. Not waiting.", e);
    1.74 +        return;      // So we don't block for a stored() that never comes.
    1.75 +      }
    1.76 +      try {
    1.77 +        Logger.debug(LOG_TAG, "Waiting...");
    1.78 +        storeSerializer.wait();
    1.79 +      } catch (InterruptedException e) {
    1.80 +        // TODO
    1.81 +      }
    1.82 +      Logger.debug(LOG_TAG, "storeSerially() dropped storeSerializer.");
    1.83 +    }
    1.84 +  }
    1.85 +
    1.86 +  private void consumerIsDone() {
    1.87 +    long counterNow = this.counter;
    1.88 +    Logger.info(LOG_TAG, "Consumer is done. Processed " + counterNow + ((counterNow == 1) ? " record." : " records."));
    1.89 +    delegate.consumerIsDone(stopImmediately);
    1.90 +  }
    1.91 +
    1.92 +  @Override
    1.93 +  public void run() {
    1.94 +    while (true) {
    1.95 +      synchronized (monitor) {
    1.96 +        Logger.debug(LOG_TAG, "run() took monitor.");
    1.97 +        if (stopImmediately) {
    1.98 +          Logger.debug(LOG_TAG, "Stopping immediately. Clearing queue.");
    1.99 +          delegate.getQueue().clear();
   1.100 +          Logger.debug(LOG_TAG, "Notifying consumer.");
   1.101 +          consumerIsDone();
   1.102 +          return;
   1.103 +        }
   1.104 +        Logger.debug(LOG_TAG, "run() dropped monitor.");
   1.105 +      }
   1.106 +      // The queue is concurrent-safe.
   1.107 +      while (!delegate.getQueue().isEmpty()) {
   1.108 +        Logger.debug(LOG_TAG, "Grabbing record...");
   1.109 +        Record record = delegate.getQueue().remove();
   1.110 +        // Block here, allowing us to process records
   1.111 +        // serially.
   1.112 +        Logger.debug(LOG_TAG, "Invoking storeSerially...");
   1.113 +        this.storeSerially(record);
   1.114 +        Logger.debug(LOG_TAG, "Done with record.");
   1.115 +      }
   1.116 +      synchronized (monitor) {
   1.117 +        Logger.debug(LOG_TAG, "run() took monitor.");
   1.118 +
   1.119 +        if (stopEventually) {
   1.120 +          Logger.debug(LOG_TAG, "Done with records and told to stop. Notifying consumer.");
   1.121 +          consumerIsDone();
   1.122 +          return;
   1.123 +        }
   1.124 +        try {
   1.125 +          Logger.debug(LOG_TAG, "Not told to stop but no records. Waiting.");
   1.126 +          monitor.wait(10000);
   1.127 +        } catch (InterruptedException e) {
   1.128 +          // TODO
   1.129 +        }
   1.130 +        Logger.debug(LOG_TAG, "run() dropped monitor.");
   1.131 +      }
   1.132 +    }
   1.133 +  }
   1.134 +}