a9863f8128
Motivation: When the MqttDecoder decodes a message larger than the 'maxBytesInMessage' a DecoderException is thrown and a MqttMessage with just the failure cause is returned. Even if I can't handle the message, I might want to send an ACK so that I won't have to worry about it again. Modification: The DecoderException is thrown after the variableHeader is decoded. The fixed and variable headers are then added to the MqttMessage along with the failure cause. Result: The invalid MqttMessage will have headers if available.
95 lines
3.5 KiB
Java
95 lines
3.5 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.mqtt;
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import io.netty.buffer.ByteBuf;
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import io.netty.handler.codec.DecoderResult;
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/**
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* Utility class with factory methods to create different types of MQTT messages.
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*/
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public final class MqttMessageFactory {
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public static MqttMessage newMessage(MqttFixedHeader mqttFixedHeader, Object variableHeader, Object payload) {
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switch (mqttFixedHeader.messageType()) {
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case CONNECT :
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return new MqttConnectMessage(
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mqttFixedHeader,
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(MqttConnectVariableHeader) variableHeader,
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(MqttConnectPayload) payload);
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case CONNACK:
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return new MqttConnAckMessage(mqttFixedHeader, (MqttConnAckVariableHeader) variableHeader);
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case SUBSCRIBE:
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return new MqttSubscribeMessage(
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mqttFixedHeader,
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(MqttMessageIdVariableHeader) variableHeader,
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(MqttSubscribePayload) payload);
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case SUBACK:
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return new MqttSubAckMessage(
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mqttFixedHeader,
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(MqttMessageIdVariableHeader) variableHeader,
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(MqttSubAckPayload) payload);
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case UNSUBACK:
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return new MqttUnsubAckMessage(
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mqttFixedHeader,
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(MqttMessageIdVariableHeader) variableHeader);
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case UNSUBSCRIBE:
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return new MqttUnsubscribeMessage(
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mqttFixedHeader,
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(MqttMessageIdVariableHeader) variableHeader,
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(MqttUnsubscribePayload) payload);
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case PUBLISH:
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return new MqttPublishMessage(
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mqttFixedHeader,
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(MqttPublishVariableHeader) variableHeader,
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(ByteBuf) payload);
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case PUBACK:
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return new MqttPubAckMessage(mqttFixedHeader, (MqttMessageIdVariableHeader) variableHeader);
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case PUBREC:
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case PUBREL:
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case PUBCOMP:
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return new MqttMessage(mqttFixedHeader, variableHeader);
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case PINGREQ:
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case PINGRESP:
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case DISCONNECT:
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return new MqttMessage(mqttFixedHeader);
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default:
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throw new IllegalArgumentException("unknown message type: " + mqttFixedHeader.messageType());
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}
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}
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public static MqttMessage newInvalidMessage(Throwable cause) {
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return new MqttMessage(null, null, null, DecoderResult.failure(cause));
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}
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public static MqttMessage newInvalidMessage(MqttFixedHeader mqttFixedHeader, Object variableHeader,
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Throwable cause) {
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return new MqttMessage(mqttFixedHeader, variableHeader, null, DecoderResult.failure(cause));
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}
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private MqttMessageFactory() { }
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}
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