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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;
import com.google.inject.Injector;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import jakarta.inject.Inject;
import jakarta.inject.Singleton;
import org.traccar.config.Config;
import org.traccar.database.BufferingManager;
import org.traccar.database.NotificationManager;
import org.traccar.handler.BasePositionHandler;
import org.traccar.handler.ComputedAttributesHandler;
import org.traccar.handler.CopyAttributesHandler;
import org.traccar.handler.DatabaseHandler;
import org.traccar.handler.DistanceHandler;
import org.traccar.handler.EngineHoursHandler;
import org.traccar.handler.FilterHandler;
import org.traccar.handler.GeocoderHandler;
import org.traccar.handler.GeofenceHandler;
import org.traccar.handler.GeolocationHandler;
import org.traccar.handler.HemisphereHandler;
import org.traccar.handler.MotionHandler;
import org.traccar.handler.OutdatedHandler;
import org.traccar.handler.PositionForwardingHandler;
import org.traccar.handler.PostProcessHandler;
import org.traccar.handler.SpeedLimitHandler;
import org.traccar.handler.TimeHandler;
import org.traccar.handler.events.AlertEventHandler;
import org.traccar.handler.events.BaseEventHandler;
import org.traccar.handler.events.BehaviorEventHandler;
import org.traccar.handler.events.CommandResultEventHandler;
import org.traccar.handler.events.DriverEventHandler;
import org.traccar.handler.events.FuelEventHandler;
import org.traccar.handler.events.GeofenceEventHandler;
import org.traccar.handler.events.IgnitionEventHandler;
import org.traccar.handler.events.MaintenanceEventHandler;
import org.traccar.handler.events.MediaEventHandler;
import org.traccar.handler.events.MotionEventHandler;
import org.traccar.handler.events.OverspeedEventHandler;
import org.traccar.handler.network.AcknowledgementHandler;
import org.traccar.helper.PositionLogger;
import org.traccar.model.Position;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Queue;
import java.util.stream.Collectors;
import java.util.stream.Stream;
@Singleton
@ChannelHandler.Sharable
public class ProcessingHandler extends ChannelInboundHandlerAdapter implements BufferingManager.Callback {
private final NotificationManager notificationManager;
private final PositionLogger positionLogger;
private final BufferingManager bufferingManager;
private final List<BasePositionHandler> positionHandlers;
private final List<BaseEventHandler> eventHandlers;
private final PostProcessHandler postProcessHandler;
private final Map<Long, Queue<Position>> queues = new HashMap<>();
private synchronized Queue<Position> getQueue(long deviceId) {
return queues.computeIfAbsent(deviceId, k -> new LinkedList<>());
}
@Inject
public ProcessingHandler(
Injector injector, Config config, NotificationManager notificationManager, PositionLogger positionLogger) {
this.notificationManager = notificationManager;
this.positionLogger = positionLogger;
bufferingManager = new BufferingManager(config, this);
positionHandlers = Stream.of(
OutdatedHandler.class,
TimeHandler.class,
GeolocationHandler.class,
HemisphereHandler.class,
DistanceHandler.class,
FilterHandler.class,
GeofenceHandler.class,
GeocoderHandler.class,
SpeedLimitHandler.class,
MotionHandler.class,
ComputedAttributesHandler.class,
EngineHoursHandler.class,
CopyAttributesHandler.class,
PositionForwardingHandler.class,
DatabaseHandler.class)
.map((clazz) -> (BasePositionHandler) injector.getInstance(clazz))
.filter(Objects::nonNull)
.collect(Collectors.toUnmodifiableList());
eventHandlers = Stream.of(
MediaEventHandler.class,
CommandResultEventHandler.class,
OverspeedEventHandler.class,
BehaviorEventHandler.class,
FuelEventHandler.class,
MotionEventHandler.class,
GeofenceEventHandler.class,
AlertEventHandler.class,
IgnitionEventHandler.class,
MaintenanceEventHandler.class,
DriverEventHandler.class)
.map((clazz) -> (BaseEventHandler) injector.getInstance(clazz))
.filter(Objects::nonNull)
.collect(Collectors.toUnmodifiableList());
postProcessHandler = injector.getInstance(PostProcessHandler.class);
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
if (msg instanceof Position position) {
bufferingManager.accept(ctx, position);
} else {
super.channelRead(ctx, msg);
}
}
@Override
public void onReleased(ChannelHandlerContext context, Position position) {
Queue<Position> queue = getQueue(position.getDeviceId());
boolean queued;
synchronized (queue) {
queued = !queue.isEmpty();
queue.offer(position);
}
if (!queued) {
processPositionHandlers(context, position);
}
}
private void processPositionHandlers(ChannelHandlerContext ctx, Position position) {
var iterator = positionHandlers.iterator();
iterator.next().handlePosition(position, new BasePositionHandler.Callback() {
@Override
public void processed(boolean filtered) {
if (!filtered) {
if (iterator.hasNext()) {
iterator.next().handlePosition(position, this);
} else {
processEventHandlers(ctx, position);
}
} else {
finishedProcessing(ctx, position, true);
}
}
});
}
private void processEventHandlers(ChannelHandlerContext ctx, Position position) {
eventHandlers.forEach(handler -> handler.analyzePosition(
position, (event) -> notificationManager.updateEvents(Map.of(event, position))));
finishedProcessing(ctx, position, false);
}
private void finishedProcessing(ChannelHandlerContext ctx, Position position, boolean filtered) {
if (!filtered) {
postProcessHandler.handlePosition(position, ignore -> {
positionLogger.log(ctx, position);
ctx.writeAndFlush(new AcknowledgementHandler.EventHandled(position));
processNextPosition(ctx, position.getDeviceId());
});
} else {
ctx.writeAndFlush(new AcknowledgementHandler.EventHandled(position));
processNextPosition(ctx, position.getDeviceId());
}
}
private void processNextPosition(ChannelHandlerContext ctx, long deviceId) {
Queue<Position> queue = getQueue(deviceId);
Position nextPosition;
synchronized (queue) {
queue.poll(); // remove current position
nextPosition = queue.peek();
}
if (nextPosition != null) {
processPositionHandlers(ctx, nextPosition);
}
}
}
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