io.cdap.delta.store

Interface StateStore

All Known Implementing Classes:

DBStateStoreService, HCFSStateStore, RemoteStateStore

public interface StateStore

An interface for state store responsible to store and read the replicator state data.

Method Summary

Modifier and Type	Method and Description
Long	getLatestGeneration(String namespace, String pipelineName)
Collection<Integer>	getWorkerInstances(DeltaPipelineId pipelineId)
OffsetAndSequence	readOffset(DeltaWorkerId id)
byte[]	readState(DeltaWorkerId id, String key)
void	writeOffset(DeltaWorkerId id, OffsetAndSequence offset)
void	writeState(DeltaWorkerId id, String key, byte[] val)

Method Detail

readOffset

OffsetAndSequence readOffset(DeltaWorkerId id)
                      throws IOException

Throws:

IOException

writeOffset

void writeOffset(DeltaWorkerId id,
                 OffsetAndSequence offset)
          throws IOException

Throws:

IOException

readState

byte[] readState(DeltaWorkerId id,
                 String key)
          throws IOException

Throws:

IOException

writeState

void writeState(DeltaWorkerId id,
                String key,
                byte[] val)
         throws IOException

Throws:

IOException

getLatestGeneration

Long getLatestGeneration(String namespace,
                         String pipelineName)
                  throws IOException

Throws:

IOException

getWorkerInstances

Collection<Integer> getWorkerInstances(DeltaPipelineId pipelineId)
                                throws IOException

Throws:

IOException