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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.synchronizer;
import org.mozilla.gecko.background.common.log.Logger;
import org.mozilla.gecko.sync.repositories.domain.Record;
/**
* Consume records from a queue inside a RecordsChannel, as fast as we can.
* TODO: rewrite this in terms of an ExecutorService and a CompletionService.
* See Bug 713483.
*
* @author rnewman
*
*/
class ConcurrentRecordConsumer extends RecordConsumer {
private static final String LOG_TAG = "CRecordConsumer";
/**
* When this is true and all records have been processed, the consumer
* will notify its delegate.
*/
protected boolean allRecordsQueued = false;
private long counter = 0;
public ConcurrentRecordConsumer(RecordsConsumerDelegate delegate) {
this.delegate = delegate;
}
private final Object monitor = new Object();
@Override
public void doNotify() {
synchronized (monitor) {
monitor.notify();
}
}
@Override
public void queueFilled() {
Logger.debug(LOG_TAG, "Queue filled.");
synchronized (monitor) {
this.allRecordsQueued = true;
monitor.notify();
}
}
@Override
public void halt() {
synchronized (monitor) {
this.stopImmediately = true;
monitor.notify();
}
}
private final Object countMonitor = new Object();
@Override
public void stored() {
Logger.trace(LOG_TAG, "Record stored. Notifying.");
synchronized (countMonitor) {
counter++;
}
}
private void consumerIsDone() {
Logger.debug(LOG_TAG, "Consumer is done. Processed " + counter + ((counter == 1) ? " record." : " records."));
delegate.consumerIsDone(!allRecordsQueued);
}
@Override
public void run() {
Record record;
while (true) {
// The queue is concurrent-safe.
while ((record = delegate.getQueue().poll()) != null) {
synchronized (monitor) {
Logger.trace(LOG_TAG, "run() took monitor.");
if (stopImmediately) {
Logger.debug(LOG_TAG, "Stopping immediately. Clearing queue.");
delegate.getQueue().clear();
Logger.debug(LOG_TAG, "Notifying consumer.");
consumerIsDone();
return;
}
Logger.debug(LOG_TAG, "run() dropped monitor.");
}
Logger.trace(LOG_TAG, "Storing record with guid " + record.guid + ".");
try {
delegate.store(record);
} catch (Exception e) {
// TODO: Bug 709371: track records that failed to apply.
Logger.error(LOG_TAG, "Caught error in store.", e);
}
Logger.trace(LOG_TAG, "Done with record.");
}
synchronized (monitor) {
Logger.trace(LOG_TAG, "run() took monitor.");
if (allRecordsQueued) {
Logger.debug(LOG_TAG, "Done with records and no more to come. Notifying consumerIsDone.");
consumerIsDone();
return;
}
if (stopImmediately) {
Logger.debug(LOG_TAG, "Done with records and told to stop immediately. Notifying consumerIsDone.");
consumerIsDone();
return;
}
try {
Logger.debug(LOG_TAG, "Not told to stop but no records. Waiting.");
monitor.wait(10000);
} catch (InterruptedException e) {
// TODO
}
Logger.trace(LOG_TAG, "run() dropped monitor.");
}
}
}
}
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