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.net.URI;
  import java.nio.ByteBuffer;
  import java.security.cert.X509Certificate;
  
  import org.apache.activemq.transport.TransportSupport;
  import org.apache.activemq.transport.amqp.AmqpFrameParser.AMQPFrameSink;
  import org.apache.activemq.transport.ws.WSTransport;
  import org.apache.activemq.util.IOExceptionSupport;
  import org.apache.activemq.util.ServiceStopper;
  import org.apache.activemq.wireformat.WireFormat;
  
  /**
   * An AMQP based WebSocket transport implementation.
   */
  public class AmqpWSTransport extends TransportSupport implements WSTransport, AMQPFrameSink {
  
      private final AmqpFrameParser frameReader = new AmqpFrameParser(this);
      private final URI remoteLocation;
  
      private WSTransportSink outputSink;
      private int receiveCounter;
      private X509Certificate[] certificates;
  
      /**
       * Create a new Transport instance.
       *
       * @param location
       *      the remote location where the client connection is from.
       * @param wireFormat
       *      the WireFormat instance that configures this Transport.
       */
      public AmqpWSTransport(URI location, WireFormat wireFormat) {
          super();
  
          remoteLocation = location;
          frameReader.setWireFormat((AmqpWireFormat) wireFormat);
      }
  
      @Override
      public void setTransportSink(WSTransportSink outputSink) {
          this.outputSink = outputSink;
      }
  
      @Override
      public void oneway(Object command) throws IOException {
          if (command instanceof ByteBuffer) {
              outputSink.onSocketOutboundBinary((ByteBuffer) command);
          } else {
              throw new IOException("Unexpected output command.");
          }
      }
  
      @Override
      public String getRemoteAddress() {
          return remoteLocation.toASCIIString();
      }
  
      @Override
      public int getReceiveCounter() {
          return receiveCounter;
      }
  
      @Override
      public X509Certificate[] getPeerCertificates() {
          return certificates;
      }
  
      @Override
      public void setPeerCertificates(X509Certificate[] certificates) {
          this.certificates = certificates;
      }
  
      @Override
      public String getSubProtocol() {
          return "amqp";
      }
  
      @Override
      public WireFormat getWireFormat() {
          return frameReader.getWireFormat();
      }
  
      @Override
      public int getMaxFrameSize() {
          return (int) Math.min(((AmqpWireFormat) getWireFormat()).getMaxFrameSize(), Integer.MAX_VALUE);
      }
  
      @Override
      protected void doStop(ServiceStopper stopper) throws Exception {
          // Currently nothing needed here since we have no async workers.
      }
  
      @Override
      protected void doStart() throws Exception {
          if (outputSink == null) {
              throw new IllegalStateException("Transport started before output sink assigned.");
          }
  
          // Currently nothing needed here since we have no async workers.
      }
  
      //----- WebSocket event hooks --------------------------------------------//
  
      @Override
      public void onWebSocketText(String data) throws IOException {
          onException(new IOException("Illegal text content receive on AMQP WebSocket channel."));
      }
  
      @Override
      public void onWebSocketBinary(ByteBuffer data) throws IOException {
          try {
              frameReader.parse(data);
          } catch (Exception e) {
              throw IOExceptionSupport.create(e);
          }
      }
  
      @Override
      public void onWebSocketClosed() throws IOException {
          onException(new IOException("Unexpected close of AMQP WebSocket channel."));
      }
  
      //----- AMQP Frame Data event hook ---------------------------------------//
  
      @Override
      public void onFrame(Object frame) {
          doConsume(frame);
      }
  }
  