Ejemplo n.º 1
0
 /**
  * To check whether an active connection exists to a given broker.
  *
  * @param brokerURI The URI of the broker to check for the connection.
  * @return true is the client is connected to the given broker; false otherwise.
  * @throws ClientException If the given URI is malformatted.
  * @see NodeAddress , {@link #connect(String)}
  */
 public boolean connectionIsActive(String brokerURI) throws ClientException {
   try {
     NodeAddress brokerAddr = ConnectionHelper.getAddress(brokerURI);
     return brokerStates.containsKey(brokerAddr);
   } catch (CommunicationException e) {
     throw new ClientException(e.getMessage(), e);
   }
 }
Ejemplo n.º 2
0
 /**
  * Provided a broker URI, this method returns the associated broker state. The broker state
  * contains the details about the broker connection as well as, depending on the configuration,
  * the adv/sub messages sent to the specified broker.
  *
  * @param brokerURI
  * @return
  * @throws ClientException If the given broker URI is mal-formatted
  */
 public BrokerState getBrokerState(String brokerURI) throws ClientException {
   try {
     NodeAddress brokerAddress = ConnectionHelper.getAddress(brokerURI);
     return brokerStates.get(brokerAddress);
   } catch (CommunicationException e) {
     throw new ClientException("Could not get broker status: " + e.getMessage(), e);
   }
 }
Ejemplo n.º 3
0
  /**
   * Connects to a broker with the given URI. The given URI should conform to an accepted
   * communication protocol format.
   *
   * @param brokerURI URI of the broker to connect to.
   * @return A BrokerState data structure to keep track of the state of the connection and related
   *     operation
   * @throws ClientException In case the given URI is malformated, a connection already exists to
   *     the specified broker, or a communication error is occurred.
   * @see BrokerState, NodeAddress
   */
  public BrokerState connect(String brokerURI) throws ClientException {
    try {
      NodeAddress brokerAddr = ConnectionHelper.getAddress(brokerURI);
      if (brokerStates.containsKey(brokerAddr)) {
        throw new ClientException("Server connection already exists");
      } else {
        if (brokerStates.size() == 0) setDefaultBrokerAddress(brokerAddr);
        MessageSender msgSender = commSystem.getMessageSender(brokerURI);
        BrokerState bState = addBrokerState(brokerAddr, msgSender);

        msgSender.connect(
            MessageDestination.formatClientDestination(clientID, brokerAddr.getNodeURI()),
            msgListener);
        return bState;
      }
    } catch (CommunicationException e) {
      exceptionLogger.error("Could not connect to broker: " + e);
      throw new ClientException("Could not connect to broker: " + e.getMessage(), e);
    }
  }