3.3. 通过截获数据包审核消息

流程

1. 实施适当的接口并覆盖其 intercept （） 方法。

   1. 如果您使用 AMQP 协议，实施 org.apache.activemq.artemis.protocol.amqp.broker.AmqpInterceptor 接口。

      package com.example;
      
      import org.apache.activemq.artemis.protocol.amqp.broker.AMQPMessage;
      import org.apache.activemq.artemis.protocol.amqp.broker.AmqpInterceptor;
      import org.apache.activemq.artemis.spi.core.protocol.RemotingConnection;
      
      public class MyInterceptor implements AmqpInterceptor
      {
        private final int ACCEPTABLE_SIZE = 1024;
      
        @Override
        public boolean intercept(final AMQPMessage message, RemotingConnection connection)
        {
          int size = message.getEncodeSize();
          if (size <= ACCEPTABLE_SIZE) {
            System.out.println("This AMQPMessage has an acceptable size.");
            return true;
          }
          return false;
        }
      }

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   2. 如果您使用的是核心协议，您的拦截器必须实现 org.apache.artemis.activemq.api.core.Interceptor 接口。

      package com.example;
      
      import org.apache.artemis.activemq.api.core.Interceptor;
      import org.apache.activemq.artemis.core.protocol.core.Packet;
      import org.apache.activemq.artemis.spi.core.protocol.RemotingConnection;
      
      public class MyInterceptor implements Interceptor
      {
        private final int ACCEPTABLE_SIZE = 1024;
      
        @Override
        boolean intercept(Packet packet, RemotingConnection connection)
        throws ActiveMQException
        {
          int size = packet.getPacketSize();
          if (size <= ACCEPTABLE_SIZE) {
            System.out.println("This Packet has an acceptable size.");
            return true;
          }
          return false;
        }
      }

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   3. 如果您使用的是 MQTT 协议，请实施 org.apache.activemq.artemis.core.protocol.mqtt.MQTTInterceptor 接口。

      package com.example;
      
      import org.apache.activemq.artemis.core.protocol.mqtt.MQTTInterceptor;
      import io.netty.handler.codec.mqtt.MqttMessage;
      import org.apache.activemq.artemis.spi.core.protocol.RemotingConnection;
      
      public class MyInterceptor implements Interceptor
      {
        private final int ACCEPTABLE_SIZE = 1024;
      
        @Override
        boolean intercept(MqttMessage mqttMessage, RemotingConnection connection)
        throws ActiveMQException
        {
          byte[] msg = (mqttMessage.toString()).getBytes();
          int size = msg.length;
          if (size <= ACCEPTABLE_SIZE) {
            System.out.println("This MqttMessage has an acceptable size.");
            return true;
          }
          return false;
        }
      }

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   4. 如果您使用 STOMP 协议，请实施 org.apache.activemq.artemis.core.protocol.stomp.StompFrameInterceptor 接口。

      package com.example;
      
      import org.apache.activemq.artemis.core.protocol.stomp.StompFrameInterceptor;
      import org.apache.activemq.artemis.core.protocol.stomp.StompFrame;
      import org.apache.activemq.artemis.spi.core.protocol.RemotingConnection;
      
      public class MyInterceptor implements Interceptor
      {
        private final int ACCEPTABLE_SIZE = 1024;
      
        @Override
        boolean intercept(StompFrame stompFrame, RemotingConnection connection)
        throws ActiveMQException
        {
          int size = stompFrame.getEncodedSize();
          if (size <= ACCEPTABLE_SIZE) {
            System.out.println("This StompFrame has an acceptable size.");
            return true;
          }
          return false;
        }
      }

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