com.alipay.sofa.jraft.storage

接口 LogStorage

所有超级接口:

Lifecycle<LogStorageOptions>, Storage

所有已知实现类:

RocksDBLogStorage, RocksDBSegmentLogStorage

public interface LogStorage
extends Lifecycle<LogStorageOptions>, Storage

Log entry storage service.

作者:

boyan (boyan@alibaba-inc.com) 2018-Mar-12 3:43:54 PM

方法概要

限定符和类型	方法和说明
int	appendEntries(List<LogEntry> entries) Append entries to log, return append success number.
boolean	appendEntry(LogEntry entry) Append entries to log.
LogEntry	getEntry(long index) Get logEntry by index.
long	getFirstLogIndex() Returns first log index in log.
long	getLastLogIndex() Returns last log index in log.
long	getTerm(long index) 已过时。
boolean	reset(long nextLogIndex) Drop all the existing logs and reset next log index to |next_log_index|.
boolean	truncatePrefix(long firstIndexKept) Delete logs from storage's head, [first_log_index, first_index_kept) will be discarded.
boolean	truncateSuffix(long lastIndexKept) Delete uncommitted logs from storage's tail, (last_index_kept, last_log_index] will be discarded.

从接口继承的方法 com.alipay.sofa.jraft.Lifecycle

init, shutdown

方法详细资料

getFirstLogIndex

long getFirstLogIndex()

Returns first log index in log.

getLastLogIndex

long getLastLogIndex()

Returns last log index in log.

getEntry

LogEntry getEntry(long index)

Get logEntry by index.

getTerm

@Deprecated
long getTerm(long index)

已过时。

Get logEntry's term by index. This method is deprecated, you should use getEntry(long) to get the log id's term.

appendEntry

boolean appendEntry(LogEntry entry)

Append entries to log.

appendEntries

int appendEntries(List<LogEntry> entries)

Append entries to log, return append success number.

truncatePrefix

boolean truncatePrefix(long firstIndexKept)

Delete logs from storage's head, [first_log_index, first_index_kept) will be discarded.

truncateSuffix

boolean truncateSuffix(long lastIndexKept)

Delete uncommitted logs from storage's tail, (last_index_kept, last_log_index] will be discarded.

reset

boolean reset(long nextLogIndex)

Drop all the existing logs and reset next log index to |next_log_index|. This function is called after installing snapshot from leader.