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/*
* Copyright 2024 Anton Tananaev (anton@traccar.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.traccar.database;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.HashedWheelTimer;
import io.netty.util.Timeout;
import io.netty.util.Timer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.traccar.config.Config;
import org.traccar.config.Keys;
import org.traccar.model.Position;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeSet;
import java.util.concurrent.TimeUnit;
public class BufferingManager {
private static final Logger LOGGER = LoggerFactory.getLogger(BufferingManager.class);
public interface Callback {
void onReleased(ChannelHandlerContext context, Position position);
}
private static final class Holder implements Comparable<Holder> {
private final ChannelHandlerContext context;
private final Position position;
private Timeout timeout;
private Holder(ChannelHandlerContext context, Position position) {
this.context = context;
this.position = position;
}
private int compareTime(Date left, Date right) {
if (left != null && right != null) {
return left.compareTo(right);
}
return 0;
}
@Override
public int compareTo(Holder other) {
int fixTimeResult = compareTime(position.getFixTime(), other.position.getFixTime());
if (fixTimeResult != 0) {
return fixTimeResult;
}
int deviceTimeResult = compareTime(position.getDeviceTime(), other.position.getDeviceTime());
if (deviceTimeResult != 0) {
return deviceTimeResult;
}
return position.getServerTime().compareTo(other.position.getServerTime());
}
}
private final Timer timer = new HashedWheelTimer();
private final Callback callback;
private final long threshold;
private final Map<Long, TreeSet<Holder>> buffer = new HashMap<>();
public BufferingManager(Config config, Callback callback) {
this.callback = callback;
threshold = config.getLong(Keys.SERVER_BUFFERING_THRESHOLD);
}
private Timeout scheduleTimeout(Holder holder) {
return timer.newTimeout(
timeout -> {
LOGGER.info("released {}", holder.position.getFixTime());
buffer.get(holder.position.getDeviceId()).remove(holder);
callback.onReleased(holder.context, holder.position);
},
threshold, TimeUnit.MILLISECONDS);
}
public void accept(ChannelHandlerContext context, Position position) {
if (threshold > 0) {
synchronized (buffer) {
LOGGER.info("queued {}", position.getFixTime());
var queue = buffer.computeIfAbsent(position.getDeviceId(), k -> new TreeSet<>());
Holder holder = new Holder(context, position);
holder.timeout = scheduleTimeout(holder);
queue.add(holder);
queue.tailSet(holder).forEach(h -> {
h.timeout.cancel();
h.timeout = scheduleTimeout(h);
});
}
} else {
callback.onReleased(context, position);
}
}
}
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