new LRU(capacity, getSizenullable)
An LRU cache, used for caching ChainEntrys.
Parameters:
| Name | Type | Attributes | Description |
|---|---|---|---|
capacity |
Number | ||
getSize |
function |
<nullable> |
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Methods
(private) _appendList(item)
Append an item to the linked list (sets new tail).
Parameters:
| Name | Type | Description |
|---|---|---|
item |
LRUItem |
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(private) _compact()
Compact the LRU linked list.
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(private) _getSize(item) → {Number}
Calculate size of an item.
Parameters:
| Name | Type | Description |
|---|---|---|
item |
LRUItem |
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Returns:
Size.
- Type
- Number
(private) _insertList(ref, item)
Insert item into the linked list.
Parameters:
| Name | Type | Description |
|---|---|---|
ref |
LRUItem | null | |
item |
LRUItem |
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(private) _prependList(item)
Prepend an item to the linked list (sets new head).
Parameters:
| Name | Type | Description |
|---|---|---|
item |
LRUItem |
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(private) _removeList(item)
Remove item from the linked list.
Parameters:
| Name | Type | Description |
|---|---|---|
item |
LRUItem |
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batch() → {LRUBatch}
Create an atomic batch for the lru (used for caching database writes).
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Returns:
- Type
- LRUBatch
clear()
Clear the pending batch.
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commit()
Commit the pending batch.
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drop()
Drop the pending batch.
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get(key) → {Object}
Retrieve an item from the cache.
Parameters:
| Name | Type | Description |
|---|---|---|
key |
String | Number |
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Returns:
Item.
- Type
- Object
has(key) → {Boolean}
Test whether the cache contains a key.
Parameters:
| Name | Type | Description |
|---|---|---|
key |
String | Number |
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Returns:
- Type
- Boolean
keys() → {Array:.<String:>}
Collect all keys in the cache, sorted by LRU.
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Returns:
push(key, value)
Push an item onto the pending batch.
Parameters:
| Name | Type | Description |
|---|---|---|
key |
String | |
value |
Object |
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remove(key) → {Boolean}
Remove an item from the cache.
Parameters:
| Name | Type | Description |
|---|---|---|
key |
String | Number |
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Returns:
Whether an item was removed.
- Type
- Boolean
reset()
Reset the cache. Clear all items.
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set(key, value)
Add an item to the cache.
Parameters:
| Name | Type | Description |
|---|---|---|
key |
String | Number | |
value |
Object |
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start()
Start the pending batch.
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toArray() → {Array:.<Object:>}
Convert the LRU cache to an array of items.
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Returns:
unpush(key)
Push a removal onto the pending batch.
Parameters:
| Name | Type | Description |
|---|---|---|
key |
String |
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values() → {Array:.<String:>}
Collect all values in the cache, sorted by LRU.
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