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34 lines
1.7 KiB
Go
34 lines
1.7 KiB
Go
package gocache
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// EvictionPolicy is what dictates how evictions are handled
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type EvictionPolicy string
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const (
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// LeastRecentlyUsed is an eviction policy that causes the most recently accessed cache entry to be moved to the
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// head of the cache. Effectively, this causes the cache entries that have not been accessed for some time to
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// gradually move closer and closer to the tail, and since the tail is the entry that gets deleted when an eviction
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// is required, it allows less used cache entries to be evicted while keeping recently accessed entries at or close
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// to the head.
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//
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// For instance, creating a Cache with a Cache.MaxSize of 3 and creating the entries 1, 2 and 3 in that order would
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// put 3 at the head and 1 at the tail:
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// 3 (head) -> 2 -> 1 (tail)
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// If the cache entry 1 was then accessed, 1 would become the head and 2 the tail:
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// 1 (head) -> 3 -> 2 (tail)
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// If a cache entry 4 was then created, because the Cache.MaxSize is 3, the tail (2) would then be evicted:
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// 4 (head) -> 1 -> 3 (tail)
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LeastRecentlyUsed EvictionPolicy = "LeastRecentlyUsed"
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// FirstInFirstOut is an eviction policy that causes cache entries to be evicted in the same order that they are
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// created.
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//
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// For instance, creating a Cache with a Cache.MaxSize of 3 and creating the entries 1, 2 and 3 in that order would
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// put 3 at the head and 1 at the tail:
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// 3 (head) -> 2 -> 1 (tail)
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// If the cache entry 1 was then accessed, unlike with LeastRecentlyUsed, nothing would change:
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// 3 (head) -> 2 -> 1 (tail)
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// If a cache entry 4 was then created, because the Cache.MaxSize is 3, the tail (1) would then be evicted:
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// 4 (head) -> 3 -> 2 (tail)
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FirstInFirstOut EvictionPolicy = "FirstInFirstOut"
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)
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