/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.activemq.apollo.mqtt;
import org.apache.activemq.apollo.broker.Broker$;
import org.apache.activemq.apollo.broker.Connector;
import org.apache.activemq.apollo.broker.protocol.ProtocolCodecFactory;
import org.fusesource.hawtbuf.Buffer;
import org.fusesource.hawtdispatch.transport.ProtocolCodec;
import org.fusesource.mqtt.codec.MQTTProtocolCodec;
/**
* Creates MqttCodec objects that encode/decode the
* <a href="http://activemq.apache.org/mqtt/">Mqtt</a> protocol.
*
* @author <a href="http://hiramchirino.com">Hiram Chirino</a>
*/
public class MqttProtocolCodecFactory implements ProtocolCodecFactory.Provider {
//
// An MQTT CONNECT message has between 10-13 bytes:
// Message Type : 0x10 @ [0]
// Remaining Length : Byte{1-4} @ [1]
// Protocol Name : 0x00 0x06 'M' 'Q' 'I' 's' 'd' 'p' @ [2|3|4|5]
//
static final String id = "mqtt";
static final Buffer HEAD_MAGIC = new Buffer(new byte []{ 0x10 });
static final Buffer MQTT31_TAIL_MAGIC = new Buffer(new byte []{ 0x00, 0x06, 'M', 'Q', 'I', 's', 'd', 'p'});
static final Buffer MQTT311_TAIL_MAGIC = new Buffer(new byte []{ 0x00, 0x04, 'M', 'Q', 'T', 'T'});
@Override
public String id() {
return id;
}
@Override
public ProtocolCodec createProtocolCodec(Connector connector) {
MQTTProtocolCodec rc = new MQTTProtocolCodec();
rc.setBufferPools(Broker$.MODULE$.buffer_pools());
return rc;
}
@Override
public boolean isIdentifiable() {
return true;
}
@Override
public int maxIdentificaionLength() {
return 13;
}
@Override
public boolean matchesIdentification(Buffer header) {
if (header.length < 10) {
return false;
} else {
return header.startsWith(HEAD_MAGIC) && (
header.indexOf(MQTT31_TAIL_MAGIC, 2) < 6 ||
header.indexOf(MQTT311_TAIL_MAGIC, 2) < 6
);
}
}
}