content: /**
   * 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.transport.amqp;
  
  import java.io.IOException;
  import java.security.cert.X509Certificate;
  import java.util.concurrent.locks.ReentrantLock;
  
  import org.apache.activemq.broker.BrokerService;
  import org.apache.activemq.command.Command;
  import org.apache.activemq.transport.Transport;
  import org.apache.activemq.transport.TransportFilter;
  import org.apache.activemq.transport.TransportListener;
  import org.apache.activemq.transport.nio.NIOSSLTransport;
  import org.apache.activemq.transport.tcp.SslTransport;
  import org.apache.activemq.util.IOExceptionSupport;
  import org.apache.activemq.wireformat.WireFormat;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * The AMQPTransportFilter normally sits on top of a TcpTransport that has been
   * configured with the AmqpWireFormat and is used to convert AMQP commands to
   * ActiveMQ commands. All of the conversion work is done by delegating to the
   * AMQPProtocolConverter
   */
  public class AmqpTransportFilter extends TransportFilter implements AmqpTransport {
      private static final Logger LOG = LoggerFactory.getLogger(AmqpTransportFilter.class);
      static final Logger TRACE_BYTES = LoggerFactory.getLogger(AmqpTransportFilter.class.getPackage().getName() + ".BYTES");
      public static final Logger TRACE_FRAMES = LoggerFactory.getLogger(AmqpTransportFilter.class.getPackage().getName() + ".FRAMES");
      private AmqpProtocolConverter protocolConverter;
      private AmqpWireFormat wireFormat;
      private AmqpInactivityMonitor monitor;
  
      private boolean trace;
      private final ReentrantLock lock = new ReentrantLock();
  
      public AmqpTransportFilter(Transport next, WireFormat wireFormat, BrokerService brokerService) {
          super(next);
          this.protocolConverter = new AmqpProtocolDiscriminator(this, brokerService);
          if (wireFormat instanceof AmqpWireFormat) {
              this.wireFormat = (AmqpWireFormat) wireFormat;
          }
      }
  
      @Override
      public void start() throws Exception {
          if (monitor != null) {
              monitor.setAmqpTransport(this);
              monitor.startConnectionTimeoutChecker(getConnectAttemptTimeout());
          }
          super.start();
      }
  
      @Override
      public void oneway(Object o) throws IOException {
          try {
              final Command command = (Command) o;
              lock.lock();
              try {
                  protocolConverter.onActiveMQCommand(command);
              } finally {
                  lock.unlock();
              }
          } catch (Exception e) {
              throw IOExceptionSupport.create(e);
          }
      }
  
      @Override
      public void onException(IOException error) {
          lock.lock();
          try {
              protocolConverter.onAMQPException(error);
          } finally {
              lock.unlock();
          }
      }
  
      @Override
      public void sendToActiveMQ(IOException error) {
          super.onException(error);
      }
  
      @Override
      public void onCommand(Object command) {
          try {
              if (trace) {
                  TRACE_BYTES.trace("Received: \n{}", command);
              }
              lock.lock();
              try {
                  protocolConverter.onAMQPData(command);
              } finally {
                  lock.unlock();
              }
          } catch (IOException e) {
              handleException(e);
          } catch (Exception e) {
              onException(IOExceptionSupport.create(e));
          }
      }
  
      @Override
      public void sendToActiveMQ(Command command) {
          assert lock.isHeldByCurrentThread();
          TransportListener l = transportListener;
          if (l != null) {
              l.onCommand(command);
          }
      }
  
      @Override
      public void sendToAmqp(Object command) throws IOException {
          assert lock.isHeldByCurrentThread();
          if (trace) {
              TRACE_BYTES.trace("Sending: \n{}", command);
          }
          Transport n = next;
          if (n != null) {
              n.oneway(command);
          }
      }
  
      @Override
      public long keepAlive() {
          long nextKeepAliveDelay = 0l;
  
          try {
              lock.lock();
              try {
                  nextKeepAliveDelay = protocolConverter.keepAlive();
              } finally {
                  lock.unlock();
              }
          } catch (IOException e) {
              handleException(e);
          } catch (Exception e) {
              onException(IOExceptionSupport.create(e));
          }
  
          return nextKeepAliveDelay;
      }
  
      @Override
      public X509Certificate[] getPeerCertificates() {
          X509Certificate[] peerCerts = null;
          if (next instanceof SslTransport) {
              peerCerts = ((SslTransport) next).getPeerCertificates();
          } else if (next instanceof NIOSSLTransport) {
              peerCerts = ((NIOSSLTransport) next).getPeerCertificates();
          }
          if (trace && peerCerts != null) {
              LOG.debug("Peer Identity has been verified\n");
          }
          return peerCerts;
      }
  
      @Override
      public boolean isTrace() {
          return trace;
      }
  
      public void setTrace(boolean trace) {
          this.trace = trace;
          this.protocolConverter.updateTracer();
      }
  
      @Override
      public AmqpWireFormat getWireFormat() {
          return this.wireFormat;
      }
  
      public void handleException(IOException e) {
          super.onException(e);
      }
  
      @Override
      public String getTransformer() {
          return wireFormat.getTransformer();
      }
  
      public void setTransformer(String transformer) {
          wireFormat.setTransformer(transformer);
      }
  
      @Override
      public AmqpProtocolConverter getProtocolConverter() {
          return protocolConverter;
      }
  
      @Override
      public void setProtocolConverter(AmqpProtocolConverter protocolConverter) {
          this.protocolConverter = protocolConverter;
      }
  
      public void setProducerCredit(int producerCredit) {
          wireFormat.setProducerCredit(producerCredit);
      }
  
      public int getProducerCredit() {
          return wireFormat.getProducerCredit();
      }
  
      @Override
      public void setInactivityMonitor(AmqpInactivityMonitor monitor) {
          this.monitor = monitor;
      }
  
      @Override
      public AmqpInactivityMonitor getInactivityMonitor() {
          return monitor;
      }
  
      @Override
      public boolean isUseInactivityMonitor() {
          return monitor != null;
      }
  
      public int getConnectAttemptTimeout() {
          return wireFormat.getConnectAttemptTimeout();
      }
  
      public void setConnectAttemptTimeout(int connectAttemptTimeout) {
          wireFormat.setConnectAttemptTimeout(connectAttemptTimeout);
      }
  
      public long getMaxFrameSize() {
          return wireFormat.getMaxFrameSize();
      }
  
      public void setMaxFrameSize(long maxFrameSize) {
          wireFormat.setMaxFrameSize(maxFrameSize);
      }
  }
  