Package com.tibco.tibjms.admin

Class RVQueuePolicy

  • java.lang.Object
    • com.tibco.tibjms.admin.RVQueuePolicy
  • public class RVQueuePolicy
extends java.lang.Object
    This class represents the discard policy of the TIBCO Rendezvous queues used internally by the TIBCO EMS Server when importing messages from TIBCO Rendezvous. Each transport uses a TIBCO RV queue, and therefore a discard policy can be defined per transport. The default policy, if omitted, is TIBRVQUEUE_DISCARD_NONE, which means that no message is ever discarded.

    Note that in a fast producer situation, this can lead to a rapid TIBCO EMS process memory growth since the internal TIBCO RV queue may hold a lot of RV messages waiting to be processed as EMS messages.

    Specifying a discard policy other than TIBRVQUEUE_DISCARD_NONE causes excess TIBCO RV messages to be discarded, and therefore not imported by the TIBCO EMS Server, but help prevents unbound memory growth.
    Since:
    EMS 5.0

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static int TIBRVQUEUE_DISCARD_FIRST
      Discard the first event in the queue (that is, the oldest event in the queue, which would otherwise be the next event to dispatch).
      static int TIBRVQUEUE_DISCARD_LAST
      Discard the last event in the queue (that is, the youngest event in the queue).
      static int TIBRVQUEUE_DISCARD_NONE
      Never discard events; use this policy when a queue has no limit on the number of events it can contain.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int getDiscardAmount()
      When the TIBCO RV queue exceeds its maximum message limit, discard a block of messages.
      int getMaxEvents()
      The maximum number of messages that the TIBCO RV queue can hold before starting to discard messages.
      int getPolicy()
      Returns the policy of this discard policy.
      java.lang.String getPolicyName()
      Returns a string representation of the discard policy.
      java.lang.String toString()  

      • Methods inherited from class java.lang.Object

        equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

    • Field Detail

      • TIBRVQUEUE_DISCARD_NONE

        public static final int TIBRVQUEUE_DISCARD_NONE
        Never discard events; use this policy when a queue has no limit on the number of events it can contain.
        See Also:
        Constant Field Values

      • TIBRVQUEUE_DISCARD_FIRST

        public static final int TIBRVQUEUE_DISCARD_FIRST
        Discard the first event in the queue (that is, the oldest event in the queue, which would otherwise be the next event to dispatch).
        See Also:
        Constant Field Values

      • TIBRVQUEUE_DISCARD_LAST

        public static final int TIBRVQUEUE_DISCARD_LAST
        Discard the last event in the queue (that is, the youngest event in the queue).
        See Also:
        Constant Field Values

    • Method Detail

      • getPolicy

        public int getPolicy()
        Returns the policy of this discard policy.
        Returns:
        the policy of this discard policy

      • getPolicyName

        public java.lang.String getPolicyName()
        Returns a string representation of the discard policy.
        Returns:
        the name of the discard policy

      • getMaxEvents

        public int getMaxEvents()
        The maximum number of messages that the TIBCO RV queue can hold before starting to discard messages.
        Returns:
        the number of events (messages) that the RV Queue can hold, or 0 if policy is TIBRVQUEUE_DISCARD_NONE

      • getDiscardAmount

        public int getDiscardAmount()
        When the TIBCO RV queue exceeds its maximum message limit, discard a block of messages. This value is the number of messages to discard.
        Returns:
        the number of messages to discard when the RV queue exceeds its maximum event limit, or 0 if policy is TIBRVQUEUE_DISCARD_NONE

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object