Package org.apache.cassandra.service

Class BatchlogResponseHandler<T>

java.lang.Object

org.apache.cassandra.service.AbstractWriteResponseHandler<T>

org.apache.cassandra.service.BatchlogResponseHandler<T>

All Implemented Interfaces:

RequestCallback<T>

public class BatchlogResponseHandler<T>
extends AbstractWriteResponseHandler<T>

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	BatchlogResponseHandler.BatchlogCleanup
static interface	BatchlogResponseHandler.BatchlogCleanupCallback

Field Summary

Fields

Modifier and Type	Field	Description
protected int	requiredBeforeFinish

Fields inherited from class org.apache.cassandra.service.AbstractWriteResponseHandler

callback, logger, replicaPlan, writeType

Constructor Summary

Constructors

Constructor	Description
BatchlogResponseHandler(AbstractWriteResponseHandler<T> wrapped, int requiredBeforeFinish, BatchlogResponseHandler.BatchlogCleanup cleanup, Dispatcher.RequestTime requestTime)

Method Summary

Modifier and Type	Method	Description
protected int	ackCount()
protected int	blockFor()
protected int	candidateReplicaCount()	TODO: this method is brittle for its purpose of deciding when we should fail a query; this needs to be aware of which nodes are live/down
void	get()
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<T> msg)	null message means "response from local write"
protected void	signal()
protected boolean	waitingFor(InetAddressAndPort from)

Methods inherited from class org.apache.cassandra.service.AbstractWriteResponseHandler

consistencyLevel, currentTimeoutNanos, expired, getRequestTime, logFailureOrTimeoutToIdealCLDelegate, logResponseToIdealCLDelegate, maybeTryAdditionalReplicas, setIdealCLResponseHandler

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.net.RequestCallback

trackLatencyForSnitch

Field Detail

requiredBeforeFinish

protected volatile int requiredBeforeFinish

Constructor Detail

BatchlogResponseHandler

public BatchlogResponseHandler(AbstractWriteResponseHandler<T> wrapped,
                               int requiredBeforeFinish,
                               BatchlogResponseHandler.BatchlogCleanup cleanup,
                               Dispatcher.RequestTime requestTime)

Method Detail

ackCount

protected int ackCount()

Specified by:

ackCount in class AbstractWriteResponseHandler<T>

Returns:

number of responses received

onResponse

public void onResponse(Message<T> msg)

Description copied from class: AbstractWriteResponseHandler

null message means "response from local write"

Specified by:

onResponse in interface RequestCallback<T>

Specified by:

onResponse in class AbstractWriteResponseHandler<T>

Parameters:

msg - response received.

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<T>

Overrides:

onFailure in class AbstractWriteResponseHandler<T>

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<T>

Overrides:

invokeOnFailure in class AbstractWriteResponseHandler<T>

Returns:

true if the callback should be invoked on failure

get

public void get()
         throws WriteTimeoutException,
                WriteFailureException

Overrides:

get in class AbstractWriteResponseHandler<T>

Throws:

WriteTimeoutException

WriteFailureException

blockFor

protected int blockFor()

Overrides:

blockFor in class AbstractWriteResponseHandler<T>

Returns:

the minimum number of endpoints that must respond.

candidateReplicaCount

protected int candidateReplicaCount()

Description copied from class: AbstractWriteResponseHandler

TODO: this method is brittle for its purpose of deciding when we should fail a query; this needs to be aware of which nodes are live/down

Overrides:

candidateReplicaCount in class AbstractWriteResponseHandler<T>

Returns:

the total number of endpoints the request can send to.

waitingFor

protected boolean waitingFor(InetAddressAndPort from)

Overrides:

waitingFor in class AbstractWriteResponseHandler<T>

Returns:

true if the message counts towards the blockFor() threshold

signal

protected void signal()

Overrides:

signal in class AbstractWriteResponseHandler<T>