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/*
* Copyright 2023 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.network;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOutboundHandlerAdapter;
import io.netty.channel.ChannelPromise;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
public class AcknowledgementHandler extends ChannelOutboundHandlerAdapter {
private static final Logger LOGGER = LoggerFactory.getLogger(AcknowledgementHandler.class);
public interface Event {
}
public static class EventReceived implements Event {
}
public static class EventDecoded implements Event {
private final Collection<Object> objects;
public EventDecoded(Collection<Object> objects) {
this.objects = objects;
}
public Collection<Object> getObjects() {
return objects;
}
}
public static class EventHandled implements Event {
private final Object object;
public EventHandled(Object object) {
this.object = object;
}
public Object getObject() {
return object;
}
}
private static final class Entry {
private final Object message;
private final ChannelPromise promise;
private Entry(Object message, ChannelPromise promise) {
this.message = message;
this.promise = promise;
}
public Object getMessage() {
return message;
}
public ChannelPromise getPromise() {
return promise;
}
}
private List<Entry> queue;
private final Set<Object> waiting = new HashSet<>();
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
List<Entry> output = new LinkedList<>();
synchronized (this) {
if (msg instanceof Event) {
if (msg instanceof EventReceived) {
LOGGER.debug("Event received");
if (queue == null) {
queue = new LinkedList<>();
}
} else if (msg instanceof EventDecoded event) {
LOGGER.debug("Event decoded {}", event.getObjects().size());
waiting.addAll(event.getObjects());
} else if (msg instanceof EventHandled event) {
LOGGER.debug("Event handled");
waiting.remove(event.getObject());
}
if (!(msg instanceof EventReceived) && waiting.isEmpty()) {
output.addAll(queue);
queue = null;
}
} else if (queue != null) {
LOGGER.debug("Message queued");
queue.add(new Entry(msg, promise));
} else {
LOGGER.debug("Message sent");
output.add(new Entry(msg, promise));
}
}
for (Entry entry : output) {
ctx.write(entry.getMessage(), entry.getPromise());
}
}
}
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