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lrucachehashandwindowsizetoblockghostdagdatahashpairs.go
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lrucachehashandwindowsizetoblockghostdagdatahashpairs.go
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package lrucachehashandwindowsizetoblockghostdagdatahashpairs
import "github.com/karlsend/PYVERT/testfork/karlsend/domain/consensus/model/externalapi"
type lruKey struct {
blockHash externalapi.DomainHash
windowSize int
}
func newKey(blockHash *externalapi.DomainHash, windowSize int) lruKey {
return lruKey{
blockHash: *blockHash,
windowSize: windowSize,
}
}
// LRUCache is a least-recently-used cache from
// lruKey to *externalapi.BlockGHOSTDAGDataHashPair
type LRUCache struct {
cache map[lruKey][]*externalapi.BlockGHOSTDAGDataHashPair
capacity int
}
// New creates a new LRUCache
func New(capacity int, preallocate bool) *LRUCache {
var cache map[lruKey][]*externalapi.BlockGHOSTDAGDataHashPair
if preallocate {
cache = make(map[lruKey][]*externalapi.BlockGHOSTDAGDataHashPair, capacity+1)
} else {
cache = make(map[lruKey][]*externalapi.BlockGHOSTDAGDataHashPair)
}
return &LRUCache{
cache: cache,
capacity: capacity,
}
}
// Add adds an entry to the LRUCache
func (c *LRUCache) Add(blockHash *externalapi.DomainHash, windowSize int, value []*externalapi.BlockGHOSTDAGDataHashPair) {
key := newKey(blockHash, windowSize)
c.cache[key] = value
if len(c.cache) > c.capacity {
c.evictRandom()
}
}
// Get returns the entry for the given key, or (nil, false) otherwise
func (c *LRUCache) Get(blockHash *externalapi.DomainHash, windowSize int) ([]*externalapi.BlockGHOSTDAGDataHashPair, bool) {
key := newKey(blockHash, windowSize)
value, ok := c.cache[key]
if !ok {
return nil, false
}
return value, true
}
// Has returns whether the LRUCache contains the given key
func (c *LRUCache) Has(blockHash *externalapi.DomainHash, windowSize int) bool {
key := newKey(blockHash, windowSize)
_, ok := c.cache[key]
return ok
}
// Remove removes the entry for the the given key. Does nothing if
// the entry does not exist
func (c *LRUCache) Remove(blockHash *externalapi.DomainHash, windowSize int) {
key := newKey(blockHash, windowSize)
delete(c.cache, key)
}
func (c *LRUCache) evictRandom() {
var keyToEvict lruKey
for key := range c.cache {
keyToEvict = key
break
}
c.Remove(&keyToEvict.blockHash, keyToEvict.windowSize)
}