org.jgroups.blocks

Class UnicastRequest<T>

java.lang.Object

org.jgroups.blocks.Request

org.jgroups.blocks.UnicastRequest<T>

All Implemented Interfaces:

Future, RspCollector, Command, NotifyingFuture

public class UnicastRequest<T>
extends Request

Sends a request to a single target destination

Author:

Bela Ban

Field Summary

Fields

Modifier and Type	Field and Description
protected Rsp<T>	result
protected Address	target

Fields inherited from class org.jgroups.blocks.Request

block_for_results, completed, corr, done, GET_ABS_MAJORITY, GET_ALL, GET_FIRST, GET_MAJORITY, GET_N, GET_NONE, listener, lock, log, options, req_id, REQUEST_ID, request_msg, transport

Constructor Summary

Constructors

Constructor and Description
UnicastRequest(Message m, RequestCorrelator corr, Address target, RequestOptions options)
UnicastRequest(Message m, Transport transport, Address target, RequestOptions options)

Method Summary

Modifier and Type	Method and Description
T	get()
T	get(long timeout, TimeUnit unit)
Rsp	getResult()
void	receiveResponse(Object response_value, Address sender) Callback (called by RequestCorrelator or Transport).
protected boolean	responsesComplete()
protected void	sendRequest()
void	suspect(Address suspected_member) Callback (called by RequestCorrelator or Transport).
String	toString()
void	viewChange(View new_view) If the target address is not a member of the new view, we'll mark the response as not received and unblock the caller of execute()

Methods inherited from class org.jgroups.blocks.Request

cancel, checkCompletion, execute, getBlockForResults, getRequestId, getResponsesComplete, isCancelled, isDone, modeToString, responsesComplete, setBlockForResults, setListener, setResponseFilter, waitForResults

Methods inherited from class java.lang.Object

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

Field Detail

result

protected final Rsp<T> result

target

protected final Address target

Constructor Detail

UnicastRequest

public UnicastRequest(Message m,
                      RequestCorrelator corr,
                      Address target,
                      RequestOptions options)

Parameters:

timeout - Time to wait for responses (ms). A value of <= 0 means wait indefinitely (e.g. if a suspicion service is available; timeouts are not needed).

UnicastRequest

public UnicastRequest(Message m,
                      Transport transport,
                      Address target,
                      RequestOptions options)

Parameters:

timeout - Time to wait for responses (ms). A value of <= 0 means wait indefinitely (e.g. if a suspicion service is available; timeouts are not needed).

Method Detail

sendRequest

protected void sendRequest()
                    throws Exception

Specified by:

sendRequest in class Request

Throws:

Exception

receiveResponse

public void receiveResponse(Object response_value,
                            Address sender)

Callback (called by RequestCorrelator or Transport). Adds a response to the response table. When all responses have been received, execute() returns.

Specified by:

receiveResponse in interface RspCollector

Specified by:

receiveResponse in class Request

suspect

public void suspect(Address suspected_member)

Callback (called by RequestCorrelator or Transport). Report to GroupRequest that a member is reported as faulty (suspected). This method would probably be called when getting a suspect message from a failure detector (where available). It is used to exclude faulty members from the response list.

Specified by:

suspect in interface RspCollector

Specified by:

suspect in class Request

viewChange

public void viewChange(View new_view)

If the target address is not a member of the new view, we'll mark the response as not received and unblock the caller of execute()

Specified by:

viewChange in interface RspCollector

Specified by:

viewChange in class Request

getResult

public Rsp getResult()

get

public T get()
      throws InterruptedException,
             ExecutionException

Throws:

InterruptedException

ExecutionException

get

public T get(long timeout,
             TimeUnit unit)
      throws InterruptedException,
             ExecutionException,
             TimeoutException

Throws:

InterruptedException

ExecutionException

TimeoutException

toString

public String toString()

Overrides:

toString in class Request

responsesComplete

protected boolean responsesComplete()

Specified by:

responsesComplete in class Request