io.openmessaging.storage.dledger.statemachine

接口 StateMachine

public interface StateMachine

Finite state machine, which should be implemented by user.

方法概要

限定符和类型	方法和说明
void	onApply(CommittedEntryIterator iter) Update the user statemachine with a batch a tasks that can be accessed through |iterator|.
void	onShutdown() Invoked once when the raft node was shut down.
boolean	onSnapshotLoad(SnapshotReader reader) User defined snapshot load function.
void	onSnapshotSave(SnapshotWriter writer, java.util.concurrent.CompletableFuture<java.lang.Boolean> done) User defined snapshot generate function, this method will block StateMachine#onApply(Iterator).

方法详细资料

onApply

void onApply(CommittedEntryIterator iter)

Update the user statemachine with a batch a tasks that can be accessed through |iterator|.

参数:

iter - iterator of committed entry

onSnapshotSave

void onSnapshotSave(SnapshotWriter writer,
                    java.util.concurrent.CompletableFuture<java.lang.Boolean> done)

User defined snapshot generate function, this method will block StateMachine#onApply(Iterator). Call done.run(status) when snapshot finished.

参数:

writer - snapshot writer

done - callback

onSnapshotLoad

boolean onSnapshotLoad(SnapshotReader reader)

User defined snapshot load function.

参数:

reader - snapshot reader

返回:

true on success

onShutdown

void onShutdown()

Invoked once when the raft node was shut down. Default do nothing