org.apache.camel.component.zookeeper.operations

Class FutureEventDrivenOperation<ResultType>

java.lang.Object

org.apache.camel.component.zookeeper.operations.ZooKeeperOperation<ResultType>

org.apache.camel.component.zookeeper.operations.FutureEventDrivenOperation<ResultType>

All Implemented Interfaces:

WatchedEventProvider, org.apache.zookeeper.Watcher

Direct Known Subclasses:

ChildrenChangedOperation, DataChangedOperation, ExistenceChangedOperation

public abstract class FutureEventDrivenOperation<ResultType>
extends ZooKeeperOperation<ResultType>
implements org.apache.zookeeper.Watcher, WatchedEventProvider

FutureEventDrivenOperation uses ZooKeepers Watcher mechanism to await specific ZooKeeper events. Typically this is used to await changes to a particular node before retrieving the change.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.zookeeper.Watcher

org.apache.zookeeper.Watcher.Event

Field Summary

Fields inherited from class org.apache.camel.component.zookeeper.operations.ZooKeeperOperation

connection, CONSTRUCTOR_ARGS, LOG, node, result, waitingThreads

Constructor Summary

Constructors

Constructor and Description
FutureEventDrivenOperation(org.apache.zookeeper.ZooKeeper connection, String node, org.apache.zookeeper.Watcher.Event.EventType... awaitedTypes)

Method Summary

Modifier and Type	Method and Description
OperationResult<ResultType>	get()
OperationResult<ResultType>	get(long timeout, TimeUnit unit)
org.apache.zookeeper.WatchedEvent	getWatchedEvent()
org.apache.zookeeper.Watcher.Event.EventType[]	getWatchedForTypes()
protected abstract void	installWatch() Install the watcher to receive WatchedEvents.
void	process(org.apache.zookeeper.WatchedEvent event)

Methods inherited from class org.apache.camel.component.zookeeper.operations.ZooKeeperOperation

cancel, createCopy, getNode, getResult, isCancelled, isDone, shouldProduceExchange

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FutureEventDrivenOperation

public FutureEventDrivenOperation(org.apache.zookeeper.ZooKeeper connection,
                                  String node,
                                  org.apache.zookeeper.Watcher.Event.EventType... awaitedTypes)

Method Detail

process

public void process(org.apache.zookeeper.WatchedEvent event)

Specified by:

process in interface org.apache.zookeeper.Watcher

get

public OperationResult<ResultType> get()
                                throws InterruptedException,
                                       ExecutionException

Overrides:

get in class ZooKeeperOperation<ResultType>

Throws:

InterruptedException

ExecutionException

get

public OperationResult<ResultType> get(long timeout,
                                       TimeUnit unit)
                                throws InterruptedException,
                                       ExecutionException,
                                       TimeoutException

Overrides:

get in class ZooKeeperOperation<ResultType>

Throws:

InterruptedException

ExecutionException

TimeoutException

installWatch

protected abstract void installWatch()

Install the watcher to receive WatchedEvents. It should use the appropriate asynchronous ZooKeeper call to do this so as not to block the route from starting. Once one of the watched for types of event is received a call is made to getResult, which can use the appropriate synchronous call to retrieve the actual data.

getWatchedEvent

public org.apache.zookeeper.WatchedEvent getWatchedEvent()

Specified by:

getWatchedEvent in interface WatchedEventProvider

getWatchedForTypes

public org.apache.zookeeper.Watcher.Event.EventType[] getWatchedForTypes()