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/*
* Copyright 2015 - 2022 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 io.netty.channel.ChannelHandler;
import io.netty.util.Timeout;
import io.netty.util.Timer;
import io.netty.util.TimerTask;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.traccar.config.Config;
import org.traccar.config.Keys;
import org.traccar.forward.PositionData;
import org.traccar.forward.PositionForwarder;
import org.traccar.forward.ResultHandler;
import org.traccar.model.Device;
import org.traccar.model.Position;
import org.traccar.session.cache.CacheManager;
import jakarta.annotation.Nullable;
import jakarta.inject.Inject;
import jakarta.inject.Singleton;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
@Singleton
@ChannelHandler.Sharable
public class PositionForwardingHandler extends BaseDataHandler {
private static final Logger LOGGER = LoggerFactory.getLogger(PositionForwardingHandler.class);
private final CacheManager cacheManager;
private final Timer timer;
private final PositionForwarder positionForwarder;
private final boolean retryEnabled;
private final int retryDelay;
private final int retryCount;
private final int retryLimit;
private final AtomicInteger deliveryPending;
@Inject
public PositionForwardingHandler(
Config config, CacheManager cacheManager, Timer timer, @Nullable PositionForwarder positionForwarder) {
this.cacheManager = cacheManager;
this.timer = timer;
this.positionForwarder = positionForwarder;
this.retryEnabled = config.getBoolean(Keys.FORWARD_RETRY_ENABLE);
this.retryDelay = config.getInteger(Keys.FORWARD_RETRY_DELAY);
this.retryCount = config.getInteger(Keys.FORWARD_RETRY_COUNT);
this.retryLimit = config.getInteger(Keys.FORWARD_RETRY_LIMIT);
this.deliveryPending = new AtomicInteger();
}
class AsyncRequestAndCallback implements ResultHandler, TimerTask {
private final PositionData positionData;
private int retries = 0;
AsyncRequestAndCallback(PositionData positionData) {
this.positionData = positionData;
deliveryPending.incrementAndGet();
}
private void send() {
positionForwarder.forward(positionData, this);
}
private void retry(Throwable throwable) {
boolean scheduled = false;
try {
if (retryEnabled && deliveryPending.get() <= retryLimit && retries < retryCount) {
schedule();
scheduled = true;
}
} finally {
int pending = scheduled ? deliveryPending.get() : deliveryPending.decrementAndGet();
LOGGER.warn("Position forwarding failed: " + pending + " pending", throwable);
}
}
private void schedule() {
timer.newTimeout(this, retryDelay * (long) Math.pow(2, retries++), TimeUnit.MILLISECONDS);
}
@Override
public void onResult(boolean success, Throwable throwable) {
if (success) {
deliveryPending.decrementAndGet();
} else {
retry(throwable);
}
}
@Override
public void run(Timeout timeout) {
boolean sent = false;
try {
if (!timeout.isCancelled()) {
send();
sent = true;
}
} finally {
if (!sent) {
deliveryPending.decrementAndGet();
}
}
}
}
@Override
protected Position handlePosition(Position position) {
if (positionForwarder != null) {
PositionData positionData = new PositionData();
positionData.setPosition(position);
positionData.setDevice(cacheManager.getObject(Device.class, position.getDeviceId()));
new AsyncRequestAndCallback(positionData).send();
}
return position;
}
}
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