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| Original file line number | Diff line number | Diff line change |
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@@ -6,3 +6,5 @@ | |
| coverage.out | ||
| .idea/ | ||
| *.iml | ||
| temp_parser_file | ||
| y.output | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| // Copyright 2015 PingCAP, Inc. | ||
| // | ||
| // 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, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package kv | ||
|
|
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| import "github.com/juju/errors" | ||
|
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| var _ Snapshot = (*cacheSnapshot)(nil) | ||
|
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| // cacheSnapshot wraps a snapshot and supports cache for read. | ||
| type cacheSnapshot struct { | ||
| cache MemBuffer | ||
| snapshot Snapshot | ||
| } | ||
|
|
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| // NewCacheSnapshot creates a new snapshot with cache embedded. | ||
| func NewCacheSnapshot(snapshot Snapshot) Snapshot { | ||
| return &cacheSnapshot{ | ||
| cache: p.Get().(MemBuffer), | ||
| snapshot: snapshot, | ||
| } | ||
| } | ||
|
|
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| // Get gets value from snapshot and saves it in cache. | ||
| func (c *cacheSnapshot) Get(k Key) ([]byte, error) { | ||
| v, err := c.cache.Get(k) | ||
| if IsErrNotFound(err) { | ||
| v, err = c.snapshot.Get(k) | ||
| if err == nil { | ||
| err = c.cache.Set([]byte(k), v) | ||
| } | ||
| return v, errors.Trace(err) | ||
| } | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| return v, nil | ||
| } | ||
|
|
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| // BatchGet gets a batch of values from snapshot and saves them in cache. | ||
| func (c *cacheSnapshot) BatchGet(keys []Key) (map[string][]byte, error) { | ||
| m := make(map[string][]byte) | ||
| var missedKeys []Key | ||
| for _, k := range keys { | ||
| v, err := c.cache.Get(k) | ||
| if IsErrNotFound(err) { | ||
| missedKeys = append(missedKeys, k) | ||
| continue | ||
| } | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| if len(v) > 0 { | ||
| m[string(k)] = v | ||
| } | ||
| // If len(v) == 0, it means that the key does not exist. | ||
| } | ||
|
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| values, err := c.snapshot.BatchGet(missedKeys) | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| for _, k := range missedKeys { | ||
| ks := string(k) | ||
| if v, ok := values[ks]; ok && len(v) > 0 { | ||
| err = c.cache.Set(k, v) | ||
| m[ks] = v | ||
| } else { | ||
| err = c.cache.Set(k, nil) | ||
| } | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| } | ||
| return m, nil | ||
| } | ||
|
|
||
| // RangeGet gets values from snapshot and saves them in cache. | ||
| // The range should be [start, end] as Snapshot.RangeGet() indicated. | ||
| func (c *cacheSnapshot) RangeGet(start, end Key, limit int) (map[string][]byte, error) { | ||
| values, err := c.snapshot.RangeGet(start, end, limit) | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| for k, v := range values { | ||
| err = c.cache.Set([]byte(k), v) | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| } | ||
| return values, nil | ||
| } | ||
|
|
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| // NewIterator creates an iterator of snapshot. | ||
| func (c *cacheSnapshot) NewIterator(param interface{}) Iterator { | ||
| return newUnionIter(c.cache.NewIterator(param), c.snapshot.NewIterator(param)) | ||
| } | ||
|
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| // Release reset membuffer and release snapshot. | ||
| func (c *cacheSnapshot) Release() { | ||
| if c.cache != nil { | ||
| c.cache.Release() | ||
| c.cache = nil | ||
| } | ||
| if c.snapshot != nil { | ||
| c.snapshot.Release() | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| // Copyright 2015 PingCAP, Inc. | ||
| // | ||
| // 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, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package kv | ||
|
|
||
| import ( | ||
| "github.com/juju/errors" | ||
| . "github.com/pingcap/check" | ||
| ) | ||
|
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| var _ = Suite(&testCacheSnapshotSuite{}) | ||
|
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| type testCacheSnapshotSuite struct { | ||
| store MemBuffer | ||
| cache Snapshot | ||
| } | ||
|
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| func (s *testCacheSnapshotSuite) SetUpTest(c *C) { | ||
| s.store = NewMemDbBuffer() | ||
| s.cache = NewCacheSnapshot(&mockSnapshot{s.store}) | ||
| } | ||
|
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| func (s *testCacheSnapshotSuite) TearDownTest(c *C) { | ||
| s.cache.Release() | ||
| } | ||
|
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| func (s *testCacheSnapshotSuite) TestGet(c *C) { | ||
| s.store.Set([]byte("1"), []byte("1")) | ||
| s.store.Set([]byte("2"), []byte("2")) | ||
|
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| v, err := s.cache.Get([]byte("1")) | ||
| c.Assert(err, IsNil) | ||
| c.Assert(v, BytesEquals, []byte("1")) | ||
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| s.store.Set([]byte("1"), []byte("3")) | ||
| v, err = s.cache.Get([]byte("1")) | ||
| c.Assert(err, IsNil) | ||
| c.Assert(v, BytesEquals, []byte("1")) | ||
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| s.store.Set([]byte("2"), []byte("4")) | ||
| v, err = s.cache.Get([]byte("2")) | ||
| c.Assert(err, IsNil) | ||
| c.Assert(v, BytesEquals, []byte("4")) | ||
| } | ||
|
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| func (s *testCacheSnapshotSuite) TestBatchGet(c *C) { | ||
| s.store.Set([]byte("1"), []byte("1")) | ||
| s.store.Set([]byte("2"), []byte("2")) | ||
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| m, err := s.cache.BatchGet([]Key{[]byte("1"), []byte("2"), []byte("3")}) | ||
| c.Assert(err, IsNil) | ||
| c.Assert(m["1"], BytesEquals, []byte("1")) | ||
| c.Assert(m["2"], BytesEquals, []byte("2")) | ||
| _, exist := m["3"] | ||
| c.Assert(exist, IsFalse) | ||
|
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| // result should be saved in cache | ||
| s.store.Set([]byte("1"), []byte("4")) | ||
| v, err := s.cache.Get([]byte("1")) | ||
| c.Assert(err, IsNil) | ||
| c.Assert(v, BytesEquals, []byte("1")) | ||
|
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| // nil result should also be saved in cache | ||
| s.store.Set([]byte("3"), []byte("3")) | ||
| m, err = s.cache.BatchGet([]Key{[]byte("3")}) | ||
| c.Assert(err, IsNil) | ||
| _, exist = m["3"] | ||
| c.Assert(exist, IsFalse) | ||
| } | ||
|
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| func (s *testCacheSnapshotSuite) TestRangeGet(c *C) { | ||
| s.store.Set([]byte("1"), []byte("1")) | ||
| s.store.Set([]byte("2"), []byte("2")) | ||
| s.store.Set([]byte("3"), []byte("3")) | ||
|
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| m, err := s.cache.RangeGet([]byte("1"), []byte("2"), 100) | ||
| c.Assert(err, IsNil) | ||
| c.Assert(m, HasLen, 2) | ||
| c.Assert(m["1"], BytesEquals, []byte("1")) | ||
| c.Assert(m["2"], BytesEquals, []byte("2")) | ||
|
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| // result should be saved in cache | ||
| s.store.Set([]byte("1"), []byte("4")) | ||
| v, err := s.cache.Get([]byte("1")) | ||
| c.Assert(err, IsNil) | ||
| c.Assert(v, BytesEquals, []byte("1")) | ||
| } | ||
|
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| type mockSnapshot struct { | ||
| store MemBuffer | ||
| } | ||
|
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| func (s *mockSnapshot) Get(k Key) ([]byte, error) { | ||
| return s.store.Get(k) | ||
| } | ||
|
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| func (s *mockSnapshot) BatchGet(keys []Key) (map[string][]byte, error) { | ||
| m := make(map[string][]byte) | ||
| for _, k := range keys { | ||
| v, err := s.store.Get(k) | ||
| if IsErrNotFound(err) { | ||
| continue | ||
| } | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| m[string(k)] = v | ||
| } | ||
| return m, nil | ||
| } | ||
|
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| func (s *mockSnapshot) RangeGet(start, end Key, limit int) (map[string][]byte, error) { | ||
| m := make(map[string][]byte) | ||
| it := s.NewIterator([]byte(start)) | ||
| defer it.Close() | ||
| endKey := string(end) | ||
| for i := 0; i < limit; i++ { | ||
| if !it.Valid() { | ||
| break | ||
| } | ||
| if it.Key() > endKey { | ||
| break | ||
| } | ||
| m[string(it.Key())] = it.Value() | ||
| err := it.Next() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| return m, nil | ||
| } | ||
|
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| func (s *mockSnapshot) NewIterator(param interface{}) Iterator { | ||
| return s.store.NewIterator(param) | ||
| } | ||
|
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| func (s *mockSnapshot) Release() { | ||
| s.store.Release() | ||
| } |
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