115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/*
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* Copyright (c) 2019 TAOS Data, Inc. <cli@taosdata.com>
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*
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* This program is free software: you can use, redistribute, and/or modify
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* it under the terms of the GNU Affero General Public License, version 3
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* or later ("AGPL"), as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TD_SYNC_RAFT_UNSTABLE_LOG_H
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#define TD_SYNC_RAFT_UNSTABLE_LOG_H
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#include "sync_type.h"
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/* in-memory unstable raft log storage */
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struct SSyncRaftUnstableLog {
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#if 0
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/* Circular buffer of log entries */
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RaftEntry *entries;
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/* size of Circular buffer */
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int size;
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/* Indexes of used slots [front, back) */
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int front, back;
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/* Index of first entry is offset + 1 */
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SyncIndex offset;
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/* meta data of snapshot */
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SSyncRaftUnstableLog snapshot;
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#endif
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};
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/**
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* return index of last in memory log, return 0 if log is empty
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**/
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//SyncIndex syncRaftLogLastIndex(SSyncRaftUnstableLog* pLog);
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#if 0
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void raftLogInit(RaftLog* pLog);
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void raftLogClose(RaftLog* pLog);
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/**
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* When startup populating log entrues loaded from disk,
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* init raft memory log with snapshot index,term and log start idnex.
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**/
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/*
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void raftLogStart(RaftLog* pLog,
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RaftSnapshotMeta snapshot,
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SyncIndex startIndex);
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*/
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/**
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* Get the number of entries the log.
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**/
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int raftLogNumEntries(const RaftLog* pLog);
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/**
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* return last term of in memory log, return 0 if log is empty
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**/
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SyncTerm raftLogLastTerm(RaftLog* pLog);
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/**
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* return term of log with the given index, return 0 if the term of index cannot be found
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* , errCode will save the error code.
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**/
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SyncTerm raftLogTermOf(RaftLog* pLog, SyncIndex index, RaftCode* errCode);
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/**
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* Get the last index of the most recent snapshot. Return 0 if there are no *
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* snapshots.
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**/
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SyncIndex raftLogSnapshotIndex(RaftLog* pLog);
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/* Append a new entry to the log. */
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int raftLogAppend(RaftLog* pLog,
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SyncTerm term,
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const SSyncBuffer *buf);
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/**
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* acquire log from given index onwards.
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**/
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/*
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int raftLogAcquire(RaftLog* pLog,
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SyncIndex index,
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RaftEntry **ppEntries,
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int *n);
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void raftLogRelease(RaftLog* pLog,
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SyncIndex index,
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RaftEntry *pEntries,
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int n);
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*/
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/* Delete all entries from the given index (included) onwards. */
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void raftLogTruncate(RaftLog* pLog, SyncIndex index);
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/**
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* when taking a new snapshot, the function will update the last snapshot information and delete
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* all entries up last_index - trailing (included). If the log contains no entry
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* a last_index - trailing, then no entry will be deleted.
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**/
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void raftLogSnapshot(RaftLog* pLog, SyncIndex index, SyncIndex trailing);
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#endif
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#endif /* TD_SYNC_RAFT_UNSTABLE_LOG_H */ |