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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, storing them serially.
* @author rnewman
*
*/
class SerialRecordConsumer extends RecordConsumer {
private static final String LOG_TAG = "SerialRecordConsumer";
protected boolean stopEventually = false;
private volatile long counter = 0;
public SerialRecordConsumer(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.stopEventually = true;
monitor.notify();
}
}
@Override
public void halt() {
Logger.debug(LOG_TAG, "Halting.");
synchronized (monitor) {
this.stopEventually = true;
this.stopImmediately = true;
monitor.notify();
}
}
private final Object storeSerializer = new Object();
@Override
public void stored() {
Logger.debug(LOG_TAG, "Record stored. Notifying.");
synchronized (storeSerializer) {
Logger.debug(LOG_TAG, "stored() took storeSerializer.");
counter++;
storeSerializer.notify();
Logger.debug(LOG_TAG, "stored() dropped storeSerializer.");
}
}
private void storeSerially(Record record) {
Logger.debug(LOG_TAG, "New record to store.");
synchronized (storeSerializer) {
Logger.debug(LOG_TAG, "storeSerially() took storeSerializer.");
Logger.debug(LOG_TAG, "Storing...");
try {
this.delegate.store(record);
} catch (Exception e) {
Logger.warn(LOG_TAG, "Got exception in store. Not waiting.", e);
return; // So we don't block for a stored() that never comes.
}
try {
Logger.debug(LOG_TAG, "Waiting...");
storeSerializer.wait();
} catch (InterruptedException e) {
// TODO
}
Logger.debug(LOG_TAG, "storeSerially() dropped storeSerializer.");
}
}
private void consumerIsDone() {
long counterNow = this.counter;
Logger.info(LOG_TAG, "Consumer is done. Processed " + counterNow + ((counterNow == 1) ? " record." : " records."));
delegate.consumerIsDone(stopImmediately);
}
@Override
public void run() {
while (true) {
synchronized (monitor) {
Logger.debug(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.");
}
// The queue is concurrent-safe.
while (!delegate.getQueue().isEmpty()) {
Logger.debug(LOG_TAG, "Grabbing record...");
Record record = delegate.getQueue().remove();
// Block here, allowing us to process records
// serially.
Logger.debug(LOG_TAG, "Invoking storeSerially...");
this.storeSerially(record);
Logger.debug(LOG_TAG, "Done with record.");
}
synchronized (monitor) {
Logger.debug(LOG_TAG, "run() took monitor.");
if (stopEventually) {
Logger.debug(LOG_TAG, "Done with records and told to stop. Notifying consumer.");
consumerIsDone();
return;
}
try {
Logger.debug(LOG_TAG, "Not told to stop but no records. Waiting.");
monitor.wait(10000);
} catch (InterruptedException e) {
// TODO
}
Logger.debug(LOG_TAG, "run() dropped monitor.");
}
}
}
}
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