org.apache.flink.runtime.checkpoint

Class StandaloneCheckpointIDCounter

java.lang.Object

org.apache.flink.runtime.checkpoint.StandaloneCheckpointIDCounter

All Implemented Interfaces:

CheckpointIDCounter

public class StandaloneCheckpointIDCounter
extends Object
implements CheckpointIDCounter

CheckpointIDCounter instances for JobManagers running in HighAvailabilityMode.NONE.

Simple wrapper around an AtomicLong.

Constructor Summary

Constructors

Constructor and Description
StandaloneCheckpointIDCounter()

Method Summary

Modifier and Type	Method and Description
long	get() Atomically gets the current checkpoint ID.
long	getAndIncrement() Atomically increments the current checkpoint ID.
long	getLast() Returns the last checkpoint ID (current - 1).
void	setCount(long newCount) Sets the current checkpoint ID.
void	shutdown(JobStatus jobStatus) Shuts the CheckpointIDCounter service.
void	start() Starts the CheckpointIDCounter service down.

Methods inherited from class java.lang.Object

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

Constructor Detail

StandaloneCheckpointIDCounter

public StandaloneCheckpointIDCounter()

Method Detail

start

public void start()
           throws Exception

Description copied from interface: CheckpointIDCounter

Starts the CheckpointIDCounter service down.

Specified by:

start in interface CheckpointIDCounter

Throws:

Exception

shutdown

public void shutdown(JobStatus jobStatus)
              throws Exception

Description copied from interface: CheckpointIDCounter

Shuts the CheckpointIDCounter service.

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

Specified by:

shutdown in interface CheckpointIDCounter

Parameters:

jobStatus - Job state on shut down

Throws:

Exception

getAndIncrement

public long getAndIncrement()
                     throws Exception

Description copied from interface: CheckpointIDCounter

Atomically increments the current checkpoint ID.

Specified by:

getAndIncrement in interface CheckpointIDCounter

Returns:

The previous checkpoint ID

Throws:

Exception

get

public long get()

Description copied from interface: CheckpointIDCounter

Atomically gets the current checkpoint ID.

Specified by:

get in interface CheckpointIDCounter

Returns:

The current checkpoint ID

setCount

public void setCount(long newCount)

Description copied from interface: CheckpointIDCounter

Sets the current checkpoint ID.

Specified by:

setCount in interface CheckpointIDCounter

Parameters:

newCount - The new ID

getLast

public long getLast()

Returns the last checkpoint ID (current - 1).

Returns:

Last checkpoint ID.