org.apache.cassandra.service

Class ResponseResolver

java.lang.Object

org.apache.cassandra.service.ResponseResolver

Direct Known Subclasses:

DataResolver, DigestResolver

public abstract class ResponseResolver
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
protected ReadCommand	command
protected ConsistencyLevel	consistency
protected Keyspace	keyspace
protected static org.slf4j.Logger	logger
protected Accumulator<MessageIn<ReadResponse>>	responses

Constructor Summary

Constructors

Constructor and Description
ResponseResolver(Keyspace keyspace, ReadCommand command, ConsistencyLevel consistency, int maxResponseCount)

Method Summary

Modifier and Type	Method and Description
abstract void	compareResponses() Compares received responses, potentially triggering a digest mismatch (for a digest resolver) and read-repairs (for a data resolver).
abstract PartitionIterator	getData()
java.lang.Iterable<MessageIn<ReadResponse>>	getMessages()
abstract boolean	isDataPresent()
void	preprocess(MessageIn<ReadResponse> message)
abstract PartitionIterator	resolve()

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

keyspace

protected final Keyspace keyspace

command

protected final ReadCommand command

consistency

protected final ConsistencyLevel consistency

responses

protected final Accumulator<MessageIn<ReadResponse>> responses

Constructor Detail

ResponseResolver

public ResponseResolver(Keyspace keyspace,
                        ReadCommand command,
                        ConsistencyLevel consistency,
                        int maxResponseCount)

Method Detail

getData

public abstract PartitionIterator getData()

resolve

public abstract PartitionIterator resolve()
                                   throws DigestMismatchException

Throws:

DigestMismatchException

compareResponses

public abstract void compareResponses()
                               throws DigestMismatchException

Compares received responses, potentially triggering a digest mismatch (for a digest resolver) and read-repairs (for a data resolver).

This is functionally equivalent to calling resolve() and consuming the result, but can be slightly more efficient in some case due to the fact that we don't care about the result itself. This is used when doing asynchronous read-repairs.

Throws:

DigestMismatchException - if it's a digest resolver and the responses don't match.

isDataPresent

public abstract boolean isDataPresent()

preprocess

public void preprocess(MessageIn<ReadResponse> message)

getMessages

public java.lang.Iterable<MessageIn<ReadResponse>> getMessages()