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/*
* Copyright 2021 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.handler.events;
import io.netty.channel.ChannelHandler;
import org.traccar.config.Config;
import org.traccar.config.Keys;
import org.traccar.database.IdentityManager;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Event;
import org.traccar.model.Position;
import java.util.Collections;
import java.util.Map;
@ChannelHandler.Sharable
public class BehaviorEventHandler extends BaseEventHandler {
private final double accelerationThreshold;
private final double brakingThreshold;
private final IdentityManager identityManager;
public BehaviorEventHandler(Config config, IdentityManager identityManager) {
accelerationThreshold = config.getDouble(Keys.EVENT_BEHAVIOR_ACCELERATION_THRESHOLD);
brakingThreshold = config.getDouble(Keys.EVENT_BEHAVIOR_BRAKING_THRESHOLD);
this.identityManager = identityManager;
}
@Override
protected Map<Event, Position> analyzePosition(Position position) {
Position lastPosition = identityManager.getLastPosition(position.getDeviceId());
if (lastPosition != null && position.getFixTime().equals(lastPosition.getFixTime())) {
double acceleration = UnitsConverter.mpsFromKnots(position.getSpeed() - lastPosition.getSpeed()) * 1000
/ (position.getFixTime().getTime() - lastPosition.getFixTime().getTime());
if (accelerationThreshold != 0 && acceleration >= accelerationThreshold) {
Event event = new Event(Event.TYPE_ALARM, position);
event.set(Position.KEY_ALARM, Position.ALARM_ACCELERATION);
return Collections.singletonMap(event, position);
} else if (brakingThreshold != 0 && acceleration <= -brakingThreshold) {
Event event = new Event(Event.TYPE_ALARM, position);
event.set(Position.KEY_ALARM, Position.ALARM_BRAKING);
return Collections.singletonMap(event, position);
}
}
return null;
}
}
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