new LRU(maxSize, getSizenullable, onRemovenullable)
An LRU cache, used for caching ChainBlocks.
Parameters:
| Name | Type | Attributes | Description |
|---|---|---|---|
maxSize |
Number | ||
getSize |
function |
<nullable> |
|
onRemove |
function |
<nullable> |
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Methods
(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 |
Object |
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Returns:
Size.
- Type
- Number
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
iterator() → {function}
Create an iterator with a next method.
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Returns:
- Type
- function
keys() → {Array.<String>}
Collect all keys in the cache, sorted by LRU.
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Returns:
- Type
- Array.<String>
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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toArray() → {Array.<Object>}
Convert the LRU cache to an array of items.
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Returns:
- Type
- Array.<Object>