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82 lines
2.9 KiB
Go
82 lines
2.9 KiB
Go
// The MIT License
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//
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// Copyright (c) 2020 Temporal Technologies Inc. All rights reserved.
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//
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// Copyright (c) 2020 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package cache
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import (
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"time"
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)
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// A Cache is a generalized interface to a cache. See cache.LRU for a specific
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// implementation (bounded cache with LRU eviction)
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type Cache interface {
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// Exist checks if a given key exists in the cache
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Exist(key string) bool
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// Get retrieves an element based on a key, returning nil if the element
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// does not exist
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Get(key string) interface{}
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// Put adds an element to the cache, returning the previous element
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Put(key string, value interface{}) interface{}
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// PutIfNotExist puts a value associated with a given key if it does not exist
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PutIfNotExist(key string, value interface{}) (interface{}, error)
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// Delete deletes an element in the cache
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Delete(key string)
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// Release decrements the ref count of a pinned element. If the ref count
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// drops to 0, the element can be evicted from the cache.
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Release(key string)
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// Size returns the number of entries currently stored in the Cache
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Size() int
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// Clear clears the cache.
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Clear()
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}
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// Options control the behavior of the cache
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type Options struct {
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// TTL controls the time-to-live for a given cache entry. Cache entries that
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// are older than the TTL will not be returned
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TTL time.Duration
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// InitialCapacity controls the initial capacity of the cache
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InitialCapacity int
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// Pin prevents in-use objects from getting evicted
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Pin bool
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// RemovedFunc is an optional function called when an element
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// is scheduled for deletion
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RemovedFunc RemovedFunc
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}
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// RemovedFunc is a type for notifying applications when an item is
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// scheduled for removal from the Cache. If f is a function with the
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// appropriate signature and i is the interface{} scheduled for
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// deletion, Cache calls go f(i)
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type RemovedFunc func(interface{})
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