-
Notifications
You must be signed in to change notification settings - Fork 9.9k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
18 changed files
with
315 additions
and
274 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| // Copyright 2015 The etcd Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package cindex | ||
|
|
||
| import ( | ||
| "encoding/binary" | ||
| "sync" | ||
| "sync/atomic" | ||
|
|
||
| "go.etcd.io/etcd/mvcc/backend" | ||
| ) | ||
|
|
||
| var ( | ||
| metaBucketName = []byte("meta") | ||
|
|
||
| consistentIndexKeyName = []byte("consistent_index") | ||
| ) | ||
|
|
||
| // ConsistentIndexer is an interface that wraps the Get/Save method. | ||
| // Consistent index is the offset of an entry in a consistent replicated log. | ||
| type ConsistentIndexer interface { | ||
|
|
||
| // ConsistentIndex returns the consistent index of current executing entry. | ||
| ConsistentIndex() uint64 | ||
|
|
||
| // SetConsistentIndex set the consistent index of current executing entry. | ||
| SetConsistentIndex(v uint64) | ||
|
|
||
| // UnsafeSave must be called holding the lock on the tx. | ||
| // It saves consistentIndex to the underlying stable storage. | ||
| UnsafeSave(tx backend.BatchTx) | ||
|
|
||
| // SetBatchTx set the available backend.BatchTx for ConsistentIndexer. | ||
| SetBatchTx(tx backend.BatchTx) | ||
| } | ||
|
|
||
| // consistentIndex represents the offset of an entry in a consistent replica log. | ||
| // It implements the ConsistentIndexer interface. | ||
| // It is always set to the offset of current entry before executing the entry, | ||
| // so ConsistentWatchableKV could get the consistent index from it. | ||
|
|
||
| type consistentIndex struct { | ||
| tx backend.BatchTx | ||
| // consistentIndex caches the "consistent_index" key's value. Accessed | ||
| // through atomics so must be 64-bit aligned. | ||
| consistentIndex uint64 | ||
| // bytesBuf8 is a byte slice of length 8 | ||
| // to avoid a repetitive allocation in saveIndex. | ||
| bytesBuf8 []byte | ||
| mutex sync.Mutex | ||
| } | ||
|
|
||
| func NewConsistentIndex(tx backend.BatchTx) ConsistentIndexer { | ||
| return &consistentIndex{tx: tx, bytesBuf8: make([]byte, 8)} | ||
| } | ||
|
|
||
| func (ci *consistentIndex) ConsistentIndex() uint64 { | ||
|
|
||
| if index := atomic.LoadUint64(&ci.consistentIndex); index > 0 { | ||
| return index | ||
| } | ||
| ci.mutex.Lock() | ||
| defer ci.mutex.Unlock() | ||
| ci.tx.Lock() | ||
| defer ci.tx.Unlock() | ||
| _, vs := ci.tx.UnsafeRange(metaBucketName, consistentIndexKeyName, nil, 0) | ||
| if len(vs) == 0 { | ||
| return 0 | ||
| } | ||
| v := binary.BigEndian.Uint64(vs[0]) | ||
| atomic.StoreUint64(&ci.consistentIndex, v) | ||
| return v | ||
| } | ||
|
|
||
| func (ci *consistentIndex) SetConsistentIndex(v uint64) { | ||
| atomic.StoreUint64(&ci.consistentIndex, v) | ||
| } | ||
|
|
||
| func (ci *consistentIndex) UnsafeSave(tx backend.BatchTx) { | ||
| bs := ci.bytesBuf8 | ||
| binary.BigEndian.PutUint64(bs, ci.consistentIndex) | ||
| // put the index into the underlying backend | ||
| // tx has been locked in TxnBegin, so there is no need to lock it again | ||
| tx.UnsafePut(metaBucketName, consistentIndexKeyName, bs) | ||
| } | ||
|
|
||
| func (ci *consistentIndex) SetBatchTx(tx backend.BatchTx) { | ||
| ci.mutex.Lock() | ||
| defer ci.mutex.Unlock() | ||
| ci.tx = tx | ||
| } | ||
|
|
||
| func NewFakeConsistentIndex(index uint64) ConsistentIndexer { | ||
| return &fakeConsistentIndex{index: index} | ||
| } | ||
|
|
||
| type fakeConsistentIndex struct{ index uint64 } | ||
|
|
||
| func (f *fakeConsistentIndex) ConsistentIndex() uint64 { return f.index } | ||
|
|
||
| func (f *fakeConsistentIndex) SetConsistentIndex(index uint64) { | ||
| atomic.StoreUint64(&f.index, index) | ||
| } | ||
|
|
||
| func (f *fakeConsistentIndex) UnsafeSave(tx backend.BatchTx) {} | ||
| func (f *fakeConsistentIndex) SetBatchTx(tx backend.BatchTx) {} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file was deleted.
Oops, something went wrong.
Oops, something went wrong.