/**
   * Gets invoked by the parser as a callback on successful message parsing (i.e. no parser errors).
   *
   * @param sipMessage Message to process (this calls the application for processing the message).
   *     <p>Jvb: note that this code is identical to TCPMessageChannel, refactor some day
   */
  public void processMessage(SIPMessage sipMessage) throws Exception {
    try {
      if (sipMessage.getFrom() == null
          || sipMessage.getTo() == null
          || sipMessage.getCallId() == null
          || sipMessage.getCSeq() == null
          || sipMessage.getViaHeaders() == null) {

        if (logger.isLoggingEnabled()) {
          String badmsg = sipMessage.encode();
          logger.logError("bad message " + badmsg);
          logger.logError(">>> Dropped Bad Msg");
        }
        return;
      }

      sipMessage.setRemoteAddress(this.peerAddress);
      sipMessage.setRemotePort(this.getPeerPort());
      sipMessage.setLocalAddress(this.getMessageProcessor().getIpAddress());
      sipMessage.setLocalPort(this.getPort());
      // Issue 3: https://telestax.atlassian.net/browse/JSIP-3
      sipMessage.setPeerPacketSourceAddress(this.peerAddress);
      sipMessage.setPeerPacketSourcePort(this.peerPort);

      ViaList viaList = sipMessage.getViaHeaders();
      // For a request
      // first via header tells where the message is coming from.
      // For response, this has already been recorded in the outgoing
      // message.
      if (sipMessage instanceof SIPRequest) {
        Via v = (Via) viaList.getFirst();
        // the peer address and tag it appropriately.
        Hop hop = sipStack.addressResolver.resolveAddress(v.getHop());
        this.peerProtocol = v.getTransport();
        // if(peerPortAdvertisedInHeaders <= 0) {
        int hopPort = v.getPort();
        if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
          logger.logDebug(
              "hop port = "
                  + hopPort
                  + " for request "
                  + sipMessage
                  + " for this channel "
                  + this
                  + " key "
                  + key);
        }
        if (hopPort <= 0) {
          // if port is 0 we assume the default port for TCP
          this.peerPortAdvertisedInHeaders = 5060;
        } else {
          this.peerPortAdvertisedInHeaders = hopPort;
        }
        if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
          logger.logDebug(
              "3.Storing peerPortAdvertisedInHeaders = "
                  + peerPortAdvertisedInHeaders
                  + " for this channel "
                  + this
                  + " key "
                  + key);
        }
        // }
        // may be needed to reconnect, when diff than peer address
        if (peerAddressAdvertisedInHeaders == null) {
          peerAddressAdvertisedInHeaders = hop.getHost();
          if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
            logger.logDebug(
                "3.Storing peerAddressAdvertisedInHeaders = "
                    + peerAddressAdvertisedInHeaders
                    + " for this channel "
                    + this
                    + " key "
                    + key);
          }
        }

        try {
          if (mySock != null) { // selfrouting makes socket = null
            // https://jain-sip.dev.java.net/issues/show_bug.cgi?id=297
            this.peerAddress = mySock.getInetAddress();
          }
          // Check to see if the received parameter matches
          // the peer address and tag it appropriately.

          // JvB: dont do this. It is both costly and incorrect
          // Must set received also when it is a FQDN, regardless
          // whether
          // it resolves to the correct IP address
          // InetAddress sentByAddress =
          // InetAddress.getByName(hop.getHost());
          // JvB: if sender added 'rport', must always set received
          boolean hasRPort = v.hasParameter(Via.RPORT);
          if (!hasRPort && v.getPort() != peerPort) {
            // https://github.com/RestComm/jain-sip/issues/79
            if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
              logger.logDebug(
                  "setting rport since viaPort "
                      + v.getPort()
                      + " different than peerPacketSourcePort "
                      + peerPort
                      + " so that the response can be routed back");
            }
            hasRPort = true;
          }
          if (hasRPort || !hop.getHost().equals(this.peerAddress.getHostAddress())) {
            v.setParameter(Via.RECEIVED, this.peerAddress.getHostAddress());
          }
          // @@@ hagai
          // JvB: technically, may only do this when Via already
          // contains
          // rport
          v.setParameter(Via.RPORT, Integer.toString(this.peerPort));
        } catch (java.text.ParseException ex) {
          InternalErrorHandler.handleException(ex);
        }
        // Use this for outgoing messages as well.
        if (!this.isCached && mySock != null) { // self routing makes
          // mySock=null
          // https://jain-sip.dev.java.net/issues/show_bug.cgi?id=297
          this.isCached = true;
          int remotePort = ((java.net.InetSocketAddress) mySock.getRemoteSocketAddress()).getPort();
          String key = IOHandler.makeKey(mySock.getInetAddress(), remotePort);
          if (this.messageProcessor instanceof NioTcpMessageProcessor) {
            // https://java.net/jira/browse/JSIP-475 don't use iohandler in case of NIO
            // communications of the socket will leak in the iohandler sockettable
            ((NioTcpMessageProcessor) this.messageProcessor)
                .nioHandler.putSocket(key, mySock.getChannel());
          } else {
            sipStack.ioHandler.putSocket(key, mySock);
          }
          // since it can close the socket it needs to be after the mySock usage otherwise
          // it the socket will be disconnected and NPE will be thrown in some edge cases
          ((ConnectionOrientedMessageProcessor) this.messageProcessor).cacheMessageChannel(this);
        }
      }

      // Foreach part of the request header, fetch it and process it

      long receptionTime = System.currentTimeMillis();
      //

      if (sipMessage instanceof SIPRequest) {
        // This is a request - process the request.
        SIPRequest sipRequest = (SIPRequest) sipMessage;
        // Create a new sever side request processor for this
        // message and let it handle the rest.

        if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
          logger.logDebug("----Processing Message---");
        }
        if (logger.isLoggingEnabled(ServerLogger.TRACE_MESSAGES)) {

          sipStack.serverLogger.logMessage(
              sipMessage,
              this.getPeerHostPort().toString(),
              this.messageProcessor.getIpAddress().getHostAddress()
                  + ":"
                  + this.messageProcessor.getPort(),
              false,
              receptionTime);
        }
        // Check for reasonable size - reject message
        // if it is too long.
        if (sipStack.getMaxMessageSize() > 0
            && sipRequest.getSize()
                    + (sipRequest.getContentLength() == null
                        ? 0
                        : sipRequest.getContentLength().getContentLength())
                > sipStack.getMaxMessageSize()) {
          SIPResponse sipResponse = sipRequest.createResponse(SIPResponse.MESSAGE_TOO_LARGE);
          byte[] resp = sipResponse.encodeAsBytes(this.getTransport());
          this.sendMessage(resp, false);
          throw new Exception("Message size exceeded");
        }

        String sipVersion = ((SIPRequest) sipMessage).getRequestLine().getSipVersion();
        if (!sipVersion.equals("SIP/2.0")) {
          SIPResponse versionNotSupported =
              ((SIPRequest) sipMessage)
                  .createResponse(Response.VERSION_NOT_SUPPORTED, "Bad SIP version " + sipVersion);
          this.sendMessage(versionNotSupported.encodeAsBytes(this.getTransport()), false);
          throw new Exception("Bad version ");
        }

        String method = ((SIPRequest) sipMessage).getMethod();
        String cseqMethod = ((SIPRequest) sipMessage).getCSeqHeader().getMethod();

        if (!method.equalsIgnoreCase(cseqMethod)) {
          SIPResponse sipResponse = sipRequest.createResponse(SIPResponse.BAD_REQUEST);
          byte[] resp = sipResponse.encodeAsBytes(this.getTransport());
          this.sendMessage(resp, false);
          throw new Exception("Bad CSeq method" + sipMessage + " method " + method);
        }

        // Stack could not create a new server request interface.
        // maybe not enough resources.
        ServerRequestInterface sipServerRequest = sipStack.newSIPServerRequest(sipRequest, this);

        if (sipServerRequest != null) {
          try {
            sipServerRequest.processRequest(sipRequest, this);
          } finally {
            if (sipServerRequest instanceof SIPTransaction) {
              SIPServerTransaction sipServerTx = (SIPServerTransaction) sipServerRequest;
              if (!sipServerTx.passToListener()) ((SIPTransaction) sipServerRequest).releaseSem();
            }
          }
        } else {
          if (sipStack.sipMessageValve
              == null) { // Allow message valves to nullify messages without error
            SIPResponse response = sipRequest.createResponse(Response.SERVICE_UNAVAILABLE);

            RetryAfter retryAfter = new RetryAfter();

            // Be a good citizen and send a decent response code back.
            try {
              retryAfter.setRetryAfter((int) (10 * (Math.random())));
              response.setHeader(retryAfter);
              this.sendMessage(response);
            } catch (Exception e) {
              // IGNore
            }
            if (logger.isLoggingEnabled())
              logger.logWarning("Dropping message -- could not acquire semaphore");
          }
        }
      } else {
        SIPResponse sipResponse = (SIPResponse) sipMessage;
        // JvB: dont do this
        // if (sipResponse.getStatusCode() == 100)
        // sipResponse.getTo().removeParameter("tag");
        try {
          sipResponse.checkHeaders();
        } catch (ParseException ex) {
          if (logger.isLoggingEnabled())
            logger.logError("Dropping Badly formatted response message >>> " + sipResponse);
          return;
        }
        // This is a response message - process it.
        // Check the size of the response.
        // If it is too large dump it silently.
        if (sipStack.getMaxMessageSize() > 0
            && sipResponse.getSize()
                    + (sipResponse.getContentLength() == null
                        ? 0
                        : sipResponse.getContentLength().getContentLength())
                > sipStack.getMaxMessageSize()) {
          if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG))
            logger.logDebug("Message size exceeded");
          return;
        }

        ServerResponseInterface sipServerResponse =
            sipStack.newSIPServerResponse(sipResponse, this);
        if (sipServerResponse != null) {
          try {
            if (sipServerResponse instanceof SIPClientTransaction
                && !((SIPClientTransaction) sipServerResponse).checkFromTag(sipResponse)) {
              if (logger.isLoggingEnabled())
                logger.logError("Dropping response message with invalid tag >>> " + sipResponse);
              return;
            }

            sipServerResponse.processResponse(sipResponse, this);
          } finally {
            if (sipServerResponse instanceof SIPTransaction
                && !((SIPTransaction) sipServerResponse).passToListener()) {
              // Note that the semaphore is released in event
              // scanner if the
              // request is actually processed by the Listener.
              ((SIPTransaction) sipServerResponse).releaseSem();
            }
          }
        } else {
          logger.logWarning(
              "Application is blocked -- could not acquire semaphore -- dropping response");
        }
      }
    } finally {
    }
  }
  /**
   * Return a formatted message to the client. We try to re-connect with the peer on the other end
   * if possible.
   *
   * @param sipMessage Message to send.
   * @throws IOException If there is an error sending the message
   */
  public void sendMessage(final SIPMessage sipMessage) throws IOException {

    if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG) && !sipMessage.isNullRequest()) {
      logger.logDebug(
          "sendMessage:: "
              + sipMessage.getFirstLine()
              + " cseq method = "
              + sipMessage.getCSeq().getMethod());
    }

    for (MessageProcessor messageProcessor : getSIPStack().getMessageProcessors()) {
      if (messageProcessor.getIpAddress().getHostAddress().equals(this.getPeerAddress())
          && messageProcessor.getPort() == this.getPeerPort()
          && messageProcessor.getTransport().equalsIgnoreCase(this.getPeerProtocol())) {
        Runnable processMessageTask =
            new Runnable() {

              public void run() {
                try {
                  processMessage((SIPMessage) sipMessage.clone());
                } catch (Exception ex) {
                  if (logger.isLoggingEnabled(ServerLogger.TRACE_ERROR)) {
                    logger.logError("Error self routing message cause by: ", ex);
                  }
                }
              }
            };
        getSIPStack().getSelfRoutingThreadpoolExecutor().execute(processMessageTask);

        if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) logger.logDebug("Self routing message");
        return;
      }
    }

    byte[] msg = sipMessage.encodeAsBytes(this.getTransport());

    long time = System.currentTimeMillis();

    // need to store the peerPortAdvertisedInHeaders in case the response has an rport (ephemeral)
    // that failed to retry on the regular via port
    // for responses, no need to store anything for subsequent requests.
    if (peerPortAdvertisedInHeaders <= 0) {
      if (sipMessage instanceof SIPResponse) {
        SIPResponse sipResponse = (SIPResponse) sipMessage;
        Via via = sipResponse.getTopmostVia();
        if (via.getRPort() > 0) {
          if (via.getPort() <= 0) {
            // if port is 0 we assume the default port for TCP
            this.peerPortAdvertisedInHeaders = 5060;
          } else {
            this.peerPortAdvertisedInHeaders = via.getPort();
          }
          if (logger.isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
            logger.logDebug(
                "1.Storing peerPortAdvertisedInHeaders = "
                    + peerPortAdvertisedInHeaders
                    + " for via port = "
                    + via.getPort()
                    + " via rport = "
                    + via.getRPort()
                    + " and peer port = "
                    + peerPort
                    + " for this channel "
                    + this
                    + " key "
                    + key);
          }
        }
      }
    }

    // JvB: also retry for responses, if the connection is gone we should
    // try to reconnect
    this.sendMessage(msg, sipMessage instanceof SIPRequest);

    // message was sent without any exception so let's set set port and
    // address before we feed it to the logger
    sipMessage.setRemoteAddress(this.peerAddress);
    sipMessage.setRemotePort(this.peerPort);
    sipMessage.setLocalAddress(this.getMessageProcessor().getIpAddress());
    sipMessage.setLocalPort(this.getPort());

    if (logger.isLoggingEnabled(ServerLogger.TRACE_MESSAGES))
      logMessage(sipMessage, peerAddress, peerPort, time);
  }