org.apache.flink.runtime.checkpoint

Interface CheckpointIDCounter

All Known Implementing Classes:

StandaloneCheckpointIDCounter, ZooKeeperCheckpointIDCounter

public interface CheckpointIDCounter

A checkpoint ID counter.

Method Summary

Modifier and Type	Method and Description
long	getAndIncrement() Atomically increments the current checkpoint ID.
void	setCount(long newId) Sets the current checkpoint ID.
void	shutdown(JobStatus jobStatus) Shuts the CheckpointIDCounter service.
void	start() Starts the CheckpointIDCounter service down.

Method Detail

start

void start()
    throws Exception

Starts the CheckpointIDCounter service down.

Throws:

Exception

shutdown

void shutdown(JobStatus jobStatus)
       throws Exception

Shuts the CheckpointIDCounter service.

The job status is forwarded and used to decide whether state should actually be discarded or kept.

Parameters:

jobStatus - Job state on shut down

Throws:

Exception

getAndIncrement

long getAndIncrement()
              throws Exception

Atomically increments the current checkpoint ID.

Returns:

The previous checkpoint ID

Throws:

Exception

setCount

void setCount(long newId)
       throws Exception

Sets the current checkpoint ID.

Parameters:

newId - The new ID

Throws:

Exception