org.apache.cassandra.service.reads

Class ReadCallback<E extends Endpoints<E>,P extends ReplicaPlan.ForRead<E,P>>

java.lang.Object

org.apache.cassandra.service.reads.ReadCallback<E,P>

All Implemented Interfaces:

RequestCallback<ReadResponse>

public class ReadCallback<E extends Endpoints<E>,P extends ReplicaPlan.ForRead<E,P>>
extends java.lang.Object
implements RequestCallback<ReadResponse>

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.slf4j.Logger	logger
ResponseResolver<E,P>	resolver

Constructor Summary

Constructors

Constructor and Description
ReadCallback(ResponseResolver<E,P> resolver, ReadCommand command, ReplicaPlan.Shared<E,P> replicaPlan, long queryStartNanoTime)

Method Summary

Modifier and Type	Method and Description
boolean	await(long timePastStart, java.util.concurrent.TimeUnit unit)
void	awaitResults()
int	blockFor()
boolean	invokeOnFailure() Returns true if the callback handles failure reporting - in which case the remove host will be asked to report failures to us in the event of a problem processing the request.
void	onFailure(InetAddressAndPort from, RequestFailureReason failureReason) Called when there is an exception on the remote node or timeout happens
void	onResponse(Message<ReadResponse> message)
protected P	replicaPlan()
void	response(ReadResponse result)
boolean	trackLatencyForSnitch()

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected static final org.slf4j.Logger logger

resolver

public final ResponseResolver<E extends Endpoints<E>,P extends ReplicaPlan.ForRead<E,P>> resolver

Constructor Detail

ReadCallback

public ReadCallback(ResponseResolver<E,P> resolver,
                    ReadCommand command,
                    ReplicaPlan.Shared<E,P> replicaPlan,
                    long queryStartNanoTime)

Method Detail

replicaPlan

protected P replicaPlan()

await

public boolean await(long timePastStart,
                     java.util.concurrent.TimeUnit unit)

awaitResults

public void awaitResults()
                  throws ReadFailureException,
                         ReadTimeoutException

Throws:

ReadFailureException

ReadTimeoutException

blockFor

public int blockFor()

onResponse

public void onResponse(Message<ReadResponse> message)

Specified by:

onResponse in interface RequestCallback<ReadResponse>

Parameters:

message - response received.

response

public void response(ReadResponse result)

trackLatencyForSnitch

public boolean trackLatencyForSnitch()

Specified by:

trackLatencyForSnitch in interface RequestCallback<ReadResponse>

Returns:

true if this callback is on the read path and its latency should be given as input to the dynamic snitch.

onFailure

public void onFailure(InetAddressAndPort from,
                      RequestFailureReason failureReason)

Description copied from interface: RequestCallback

Called when there is an exception on the remote node or timeout happens

Specified by:

onFailure in interface RequestCallback<ReadResponse>

invokeOnFailure

public boolean invokeOnFailure()

Description copied from interface: RequestCallback

Returns true if the callback handles failure reporting - in which case the remove host will be asked to report failures to us in the event of a problem processing the request. TODO: this is an error prone method, and we should be handling failures everywhere so we should probably just start doing that, and remove this method

Specified by:

invokeOnFailure in interface RequestCallback<ReadResponse>

Returns:

true if the callback should be invoked on failure