cgl.narada.transport.udp
Class UDPLink

java.lang.Object
  extended by cgl.narada.transport.MonitoredLink
      extended by cgl.narada.transport.udp.UDPLink
All Implemented Interfaces:
Link, TransportDebugFlags

public class UDPLink
extends MonitoredLink
implements Link, TransportDebugFlags

This is a UDP implementation of the Link interface. Say we are trying to establish a communication from node A to node B. To create links one needs following properties to be specified.

  • hostname - The host on which node B's process is running
  • portnum - The portnum on which node B is listening to, for datagram packets.


    Field Summary
     
    Fields inherited from interface cgl.narada.transport.TransportDebugFlags
    IPSecLink_Debug, IPSecLinkFactory_Debug, IPSecReceiverThread_Debug, IPSecSenderThread_Debug, IPSecServerThread_Debug, MulticastLink_Debug, MulticastLinkFactory_Debug, MulticastReceiverThread_Debug, MulticastSenderThread_Debug, NIOTCPLink_Debug, NIOTCPLinkFactory_Debug, NIOTCPReceiverThread_Debug, NIOTCPSenderThread_Debug, NIOTCPServerThread_Debug, PoolTCPLink_Debug, PoolTCPLinkFactory_Debug, PoolTCPLinkReceiver_Debug, PoolTCPLinkSender_Debug, PoolTCPServerThread_Debug, PTCPLink_Debug, PTCPLinkFactory_Debug, PTCPReceiverThread_Debug, PTCPSenderThread_Debug, PTCPServerThread_Debug, ReceiveTask_Debug, RTPLink_Debug, RTPLinkFactory_Debug, RTPReceiverThread_Debug, RTPSenderThread_Debug, SendTask_Debug, TCPLink_Debug, TCPLinkFactory_Debug, TCPReceiverThread_Debug, TCPSenderThread_Debug, TCPServerThread_Debug, TransmissionManager_Debug, TransportHandlerImpl_Debug, UDPLink_Debug, UDPLinkFactory_Debug, UDPReceiverThread_Debug, UDPSenderThread_Debug
     
    Constructor Summary
    UDPLink(DatagramSocket socket, InetAddress ia, int udpPort, UDPLinkFactory udpLinkFactory)
               
     
    Method Summary
     void closeLink()
              Garbage collect resources associated with this link.
     String getLinkId()
              Retrieves the String based id of the link
     String getLinkType()
              Returns the type of the communication link
     Object getNaradaBrokeringId()
              Returns the NaradaBrokeringId associated with this link
     String getSecurityInformation()
              Information pertaining to the security strategy adopted for this communication link
     TransportHandler getTransportHandler()
               
     boolean isSecure()
              Indicates weather communication is encrypted on this link
     void processLossOfSocketConnection(boolean senderNotification)
              If the senderNotification is false, it implies that the detection of connection loss has been reported by the receiver thread.
     void sendCloseMessage()
              sends a message to close a link
     void sendData(byte[] data)
              The method used to send data over a communication link
     void sendData(byte[] data, String dataType)
              The method used to send data over a communication link, this method also includes information regarding the type (audio/video/xml-attachments etc.) of the data encapsulated within the data stream.
     void setKeepAliveTime(long keepAliveTime)
              Set the amount of time after which resources associated with this link need to be garbage collected.
     void setLinkId(String stringId)
              Sets the Id of the communication link
     void setLinkMigrationConstraint(String constraint, String linkType)
              Sets the conditions under which communication protocols need to be switched and the transport link that it should be switched to under the condition.
     void setLinkStatusInterval(long interval)
              Check the status of the communication link at intervals specified in the argument of this method
     void setNaradaBrokeringId(Object brokeringId)
              The Naradabrokering Id of the node this link interacts with
     
    Methods inherited from class cgl.narada.transport.MonitoredLink
    disablePerformanceFactor, enablePerformanceFactor, getAllPerformanceData, getLatencies, getPerformanceData, getPerformanceFactorsMeasured, performanceGatheringEnabled, processPerformancePackets, sendPerformancePackets, setPerformanceGathering
     
    Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
     
    Methods inherited from interface cgl.narada.transport.Link
    getAllPerformanceData, getPerformanceData, getPerformanceFactorsMeasured, performanceGatheringEnabled, setPerformanceGathering
     

    Constructor Detail

    UDPLink

    public UDPLink(DatagramSocket socket,
                   InetAddress ia,
                   int udpPort,
                   UDPLinkFactory udpLinkFactory)
            throws TransportException
    Throws:
    TransportException
    Method Detail

    sendData

    public void sendData(byte[] data)
                  throws TransportException
    The method used to send data over a communication link

    Specified by:
    sendData in interface Link
    Throws:
    TransportException

    sendData

    public void sendData(byte[] data,
                         String dataType)
                  throws TransportException
    The method used to send data over a communication link, this method also includes information regarding the type (audio/video/xml-attachments etc.) of the data encapsulated within the data stream. Using this information links can optimally flush/send data across the link

    Specified by:
    sendData in interface Link
    Throws:
    TransportException

    sendCloseMessage

    public void sendCloseMessage()
                          throws TransportException
    sends a message to close a link

    Throws:
    TransportException

    setLinkId

    public void setLinkId(String stringId)
    Sets the Id of the communication link

    Specified by:
    setLinkId in interface Link

    getLinkId

    public String getLinkId()
    Retrieves the String based id of the link

    Specified by:
    getLinkId in interface Link

    setNaradaBrokeringId

    public void setNaradaBrokeringId(Object brokeringId)
    The Naradabrokering Id of the node this link interacts with

    Specified by:
    setNaradaBrokeringId in interface Link

    getNaradaBrokeringId

    public Object getNaradaBrokeringId()
    Returns the NaradaBrokeringId associated with this link

    Specified by:
    getNaradaBrokeringId in interface Link

    getLinkType

    public String getLinkType()
    Returns the type of the communication link

    Specified by:
    getLinkType in interface Link

    setLinkMigrationConstraint

    public void setLinkMigrationConstraint(String constraint,
                                           String linkType)
    Sets the conditions under which communication protocols need to be switched and the transport link that it should be switched to under the condition. Multiple constraints can be set signifying migration to different protocols.

    Specified by:
    setLinkMigrationConstraint in interface Link

    setLinkStatusInterval

    public void setLinkStatusInterval(long interval)
    Check the status of the communication link at intervals specified in the argument of this method

    Specified by:
    setLinkStatusInterval in interface Link

    setKeepAliveTime

    public void setKeepAliveTime(long keepAliveTime)
    Set the amount of time after which resources associated with this link need to be garbage collected. A value of '0' indicates that this link needs to be active at all times.

    Specified by:
    setKeepAliveTime in interface Link

    closeLink

    public void closeLink()
    Garbage collect resources associated with this link. Sockets need to be closed and any resources associated with communication, needs to be garbage collected

    Specified by:
    closeLink in interface Link

    isSecure

    public boolean isSecure()
    Indicates weather communication is encrypted on this link

    Specified by:
    isSecure in interface Link

    getSecurityInformation

    public String getSecurityInformation()
    Information pertaining to the security strategy adopted for this communication link

    Specified by:
    getSecurityInformation in interface Link

    processLossOfSocketConnection

    public void processLossOfSocketConnection(boolean senderNotification)
    If the senderNotification is false, it implies that the detection of connection loss has been reported by the receiver thread. Proceed to garbage collect the sender thread. If the boolean variable is true, it implies that the receiver thread has to be garbage collected.


    getTransportHandler

    public TransportHandler getTransportHandler()


    For comments and suggestions please send e-mail to The NaradaBrokering Project