39 lines
929 B
Go
39 lines
929 B
Go
package ui
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type CacheHashFn func(interface{}) string
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type CacheHashContextFn func(Context) string
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func (c CacheHashContextFn) Fn() CacheHashFn {
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return func(state interface{}) string { return c(state.(Context)) }
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}
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type CacheUpdateFn func(interface{}) interface{}
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type CacheUpdateContextFn func(Context) interface{}
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func (c CacheUpdateContextFn) Fn() CacheUpdateFn {
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return func(state interface{}) interface{} { return c(state.(Context)) }
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}
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type Cache struct {
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value interface{}
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hash string
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updateFn CacheUpdateFn
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hashFn CacheHashFn
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}
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func NewCache(update CacheUpdateFn, hash CacheHashFn) *Cache {
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return &Cache{updateFn: update, hashFn: hash}
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}
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func NewCacheContext(update CacheUpdateContextFn, hash CacheHashContextFn) *Cache {
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return NewCache(update.Fn(), hash.Fn())
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}
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func (c *Cache) Get(state interface{}) interface{} {
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if c.hashFn(state) != c.hash {
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c.value = c.updateFn(state)
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}
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return c.value
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}
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