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[lbry] claimtrie: created node cache
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,101 @@ | ||
package node | ||
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import ( | ||
"container/list" | ||
"sync" | ||
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"github.com/lbryio/lbcd/claimtrie/change" | ||
) | ||
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type cacheLeaf struct { | ||
node *Node | ||
element *list.Element | ||
changes []change.Change | ||
height int32 | ||
} | ||
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type Cache struct { | ||
nodes map[string]*cacheLeaf | ||
order *list.List | ||
mtx sync.Mutex | ||
limit int | ||
} | ||
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func (nc *Cache) insert(name []byte, n *Node, height int32) { | ||
key := string(name) | ||
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nc.mtx.Lock() | ||
defer nc.mtx.Unlock() | ||
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existing := nc.nodes[key] | ||
if existing != nil { | ||
existing.node = n | ||
existing.height = height | ||
existing.changes = nil | ||
nc.order.MoveToFront(existing.element) | ||
return | ||
} | ||
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for nc.order.Len() >= nc.limit { | ||
// TODO: maybe ensure that we don't remove nodes that have a lot of changes? | ||
delete(nc.nodes, nc.order.Back().Value.(string)) | ||
nc.order.Remove(nc.order.Back()) | ||
} | ||
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element := nc.order.PushFront(key) | ||
nc.nodes[key] = &cacheLeaf{node: n, element: element, height: height} | ||
} | ||
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func (nc *Cache) fetch(name []byte, height int32) (*Node, []change.Change, int32) { | ||
key := string(name) | ||
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nc.mtx.Lock() | ||
defer nc.mtx.Unlock() | ||
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existing := nc.nodes[key] | ||
if existing != nil && existing.height <= height { | ||
nc.order.MoveToFront(existing.element) | ||
return existing.node, existing.changes, existing.height | ||
} | ||
return nil, nil, -1 | ||
} | ||
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func (nc *Cache) addChanges(changes []change.Change, height int32) { | ||
nc.mtx.Lock() | ||
defer nc.mtx.Unlock() | ||
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for _, c := range changes { | ||
key := string(c.Name) | ||
existing := nc.nodes[key] | ||
if existing != nil && existing.height <= height { | ||
existing.changes = append(existing.changes, c) | ||
} | ||
} | ||
} | ||
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func (nc *Cache) drop(names [][]byte) { | ||
nc.mtx.Lock() | ||
defer nc.mtx.Unlock() | ||
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for _, name := range names { | ||
key := string(name) | ||
existing := nc.nodes[key] | ||
if existing != nil { | ||
// we can't roll it backwards because we don't know its previous height value; just toast it | ||
delete(nc.nodes, key) | ||
nc.order.Remove(existing.element) | ||
} | ||
} | ||
} | ||
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func (nc *Cache) clear() { | ||
nc.mtx.Lock() | ||
defer nc.mtx.Unlock() | ||
nc.nodes = map[string]*cacheLeaf{} | ||
nc.order = list.New() | ||
// we'll let the GC sort out the remains... | ||
} | ||
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func NewCache(limit int) *Cache { | ||
return &Cache{limit: limit, nodes: map[string]*cacheLeaf{}, order: list.New()} | ||
} |
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