Implement metadata cache, metadata cache is used by top level donut right now. Rename trove as data cache
We should use it internally everywhere.master
Harshavardhana
10 years ago
parent
7d2609856e
commit
0a827305ad
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/* |
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* Minimalist Object Storage, (C) 2015 Minio, Inc. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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// Package metadata implements in memory caching methods for metadata information
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package metadata |
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import ( |
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"sync" |
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"time" |
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) |
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var noExpiration = time.Duration(0) |
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// Cache holds the required variables to compose an in memory cache system
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// which also provides expiring key mechanism and also maxSize
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type Cache struct { |
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// Mutex is used for handling the concurrent
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// read/write requests for cache
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sync.Mutex |
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// items hold the cached objects
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items map[string]interface{} |
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// updatedAt holds the time that related item's updated at
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updatedAt map[string]time.Time |
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} |
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// Stats current cache statistics
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type Stats struct { |
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Items int |
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} |
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// NewCache creates an inmemory cache
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//
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func NewCache() *Cache { |
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return &Cache{ |
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items: make(map[string]interface{}), |
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updatedAt: map[string]time.Time{}, |
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} |
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} |
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// Stats get current cache statistics
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func (r *Cache) Stats() Stats { |
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return Stats{ |
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Items: len(r.items), |
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} |
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} |
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// GetAll returs all the items
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func (r *Cache) GetAll() map[string]interface{} { |
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r.Lock() |
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defer r.Unlock() |
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// copy
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items := r.items |
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return items |
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} |
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// Get returns a value of a given key if it exists
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func (r *Cache) Get(key string) interface{} { |
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r.Lock() |
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defer r.Unlock() |
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value, ok := r.items[key] |
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if !ok { |
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return nil |
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} |
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r.updatedAt[key] = time.Now() |
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return value |
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} |
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// Exists returns true if key exists
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func (r *Cache) Exists(key string) bool { |
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r.Lock() |
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defer r.Unlock() |
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_, ok := r.items[key] |
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return ok |
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} |
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// Set will persist a value to the cache
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func (r *Cache) Set(key string, value interface{}) bool { |
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r.Lock() |
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defer r.Unlock() |
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r.items[key] = value |
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r.updatedAt[key] = time.Now() |
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return true |
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} |
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// Delete deletes a given key if exists
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func (r *Cache) Delete(key string) { |
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r.Lock() |
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defer r.Unlock() |
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r.doDelete(key) |
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} |
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func (r *Cache) doDelete(key string) { |
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if _, ok := r.items[key]; ok { |
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delete(r.items, key) |
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delete(r.updatedAt, key) |
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} |
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} |
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@ -0,0 +1,46 @@ |
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/* |
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* Minimalist Object Storage, (C) 2015 Minio, Inc. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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package metadata |
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import ( |
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"testing" |
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. "github.com/minio/check" |
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) |
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func Test(t *testing.T) { TestingT(t) } |
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type MySuite struct{} |
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var _ = Suite(&MySuite{}) |
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func (s *MySuite) TestCache(c *C) { |
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cache := NewCache() |
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data := []byte("Hello, world!") |
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ok := cache.Set("filename", data) |
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c.Assert(ok, Equals, true) |
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storedata := cache.Get("filename") |
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c.Assert(ok, Equals, true) |
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c.Assert(data, DeepEquals, storedata) |
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cache.Delete("filename") |
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ok = cache.Exists("filename") |
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c.Assert(ok, Equals, false) |
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} |
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