org.apache.cassandra.service

Class DigestResolver

java.lang.Object

org.apache.cassandra.service.ResponseResolver

org.apache.cassandra.service.DigestResolver

public class DigestResolver
extends ResponseResolver

Field Summary

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

command, consistency, keyspace, logger, responses

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
void	compareResponses() Compares received responses, potentially triggering a digest mismatch (for a digest resolver) and read-repairs (for a data resolver).
PartitionIterator	getData() Special case of resolve() so that CL.ONE reads never throw DigestMismatchException in the foreground
boolean	isDataPresent()
void	preprocess(MessageIn<ReadResponse> message)
PartitionIterator	resolve()

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

getMessages

Methods inherited from class java.lang.Object

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

Constructor Detail

DigestResolver

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

Method Detail

preprocess

public void preprocess(MessageIn<ReadResponse> message)

Overrides:

preprocess in class ResponseResolver

getData

public PartitionIterator getData()

Special case of resolve() so that CL.ONE reads never throw DigestMismatchException in the foreground

Specified by:

getData in class ResponseResolver

resolve

public PartitionIterator resolve()
                          throws DigestMismatchException

Specified by:

resolve in class ResponseResolver

Throws:

DigestMismatchException

compareResponses

public void compareResponses()
                      throws DigestMismatchException

Description copied from class: ResponseResolver

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 ResponseResolver.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.

Specified by:

compareResponses in class ResponseResolver

Throws:

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

isDataPresent

public boolean isDataPresent()

Specified by:

isDataPresent in class ResponseResolver