public Interface CheckpointAlgorithm

The beginCheckpoint method is invoked before the next checkpoint interval begins (before the next chunk transaction begins).

Exceptions

Exception:

thrown for any errors.

The checkpointTimeout is invoked at the beginning of a new checkpoint interval for the purpose of establishing the checkpoint timeout. It is invoked before the next chunk transaction begins. This method returns an integer value, which is the timeout value (expressed in seconds) which will be used for the next chunk transaction. This method is useful to automate the setting of the checkpoint timeout based on factors known outside the job definition. A value of '0' signifies no maximum established by this CheckpointAlgorithm, i.e. the maximum permissible timeout allowed by the runtime environment.

Returns:int

the timeout interval (expressed in seconds) to use for the next checkpoint interval

Exceptions

Exception:

thrown for any errors.

The endCheckpoint method is invoked after the last checkpoint is taken (after the chunk transaction is committed).

Exceptions

Exception:

thrown for any errors.

The isReadyToCheckpoint method is invoked by the batch runtime after each item is processed to determine if now is the time to checkpoint the current chunk.

Returns:boolean

boolean indicating whether or not to checkpoint now.

Exceptions

Exception:

thrown for any errors.