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
9 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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