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trait ZookeeperStateMonitor extends AnyRef

A zk monitor trait that assists with monitoring a given zk path for any node data change, in which the provided zk data handling implementation will be invoked.

This monitor will maintain a queue so that every work item triggered by zk event will be processed in an order with a back off policy. It also set-up a zookeeper connection watcher by default to re-set the data change watcher even during zk re-connect.

The monitor will set-up all watcher properly kick off the loop to process future event; you can also invoke loadZKData() in your class anytime to force reading zk data and apply it.

Example use cases are: - zookeeper based CachePoolCluster uses this to monitor cache pool members change - zookeeper based MigrationClient uses this ot monitor migration state transitioning

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Abstract Value Members

  1. abstract def applyZKData(data: Array[Byte]): Unit

    Load the zookeeper node data as well as leaving a data watch, then invoke the applyZKData implementation to process the data string.

  2. abstract val statsReceiver: StatsReceiver
    Attributes
    protected
  3. abstract val zkClient: ZooKeeperClient
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    protected
  4. abstract val zkPath: String
    Attributes
    protected

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  4. def applyZKChildren(children: List[String]): Unit

    Load the zookeeper node children as well as leaving a children watch, then invoke the applyZKChildren implementation to process the children list.

  5. final def asInstanceOf[T0]: T0
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  6. def clone(): AnyRef
    Attributes
    protected[java.lang]
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    @native() @throws( ... )
  7. final def eq(arg0: AnyRef): Boolean
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  8. def equals(arg0: Any): Boolean
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  9. def finalize(): Unit
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    protected[java.lang]
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    @throws( classOf[java.lang.Throwable] )
  10. final def getClass(): Class[_]
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    @native()
  11. def hashCode(): Int
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    @native()
  12. final def isInstanceOf[T0]: Boolean
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  13. def loadZKChildren: () ⇒ Unit
  14. def loadZKData: () ⇒ Unit
  15. final def ne(arg0: AnyRef): Boolean
    Definition Classes
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  16. final def notify(): Unit
    Definition Classes
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    @native()
  17. final def notifyAll(): Unit
    Definition Classes
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    @native()
  18. def reconnectZK: () ⇒ Unit

    Reconnect to the zookeeper, this maybe invoked when zookeeper connection expired and the node data watcher previously registered got dropped, hence re-attache the data wather here.

  19. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
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  20. def toString(): String
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  21. final def wait(): Unit
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    @throws( ... )
  22. final def wait(arg0: Long, arg1: Int): Unit
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  23. final def wait(arg0: Long): Unit
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