SecondaryCache

extends Iterable

Iterable class that wraps another cache. Objects added to or removed from a secondary cache are also automatically added to or removed from the primary cache that it wraps.

Instances of this class should not be constructed by users.

Methods Inherited From Iterable

__len()

Defines the behavior of the # operator. Returns the total number of objects stored in the iterable.

This method only operates on data in memory.

Returns: function

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__pairs()

Defines the behavior of the pairs function. Returns an iterator that returns a key, value pair, where key is the result of calling __hash on the value.

This method only operates on data in memory.

Returns: function

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count(fn)

Parameter	Type	Optional
fn	function	✔

If a predicate is provided, this returns the number of objects in the iterable that satisfy the predicate; otherwise, the total number of objects.

This method only operates on data in memory.

Returns: number

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find(fn)

Parameter	Type
fn	function

Returns the first object that satisfies a predicate.

This method only operates on data in memory.

Returns: *

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findAll(fn)

Parameter	Type
fn	function

Returns an iterator that returns all objects that satisfy a predicate.

This method only operates on data in memory.

Returns: function

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forEach(fn)

Parameter	Type
fn	function

Iterates through all objects and calls a function fn that takes the objects as an argument.

This method only operates on data in memory.

Returns: nil

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get(k)

Parameter	Type
k	*

Returns an individual object by key, where the key should match the result of calling __hash on the contained objects. Operates with up to O(n) complexity.

This method only operates on data in memory.

Returns: *

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pick(...)

Parameter	Type
...	string/function

This returns an iterator that, when called, returns the values from each encountered object, picked by the provided keys. If a key is a string, the objects are indexed with the string. If a key is a function, the function is called with the object passed as its first argument.

This method only operates on data in memory.

Returns: function

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random()

Returns a random object that is contained in the iterable.

This method only operates on data in memory.

Returns: *

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select(...)

Parameter	Type
...	string

Similarly to an SQL query, this returns a sorted Lua table of rows where each row corresponds to each object in the iterable, and each value in the row is selected from the objects according to the keys provided.

This method only operates on data in memory.

Returns: table

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toArray(sortBy, fn)

Parameter	Type	Optional
sortBy	string	✔
fn	function	✔

Returns a sequentially-indexed table that contains references to all objects. If a sortBy string is provided, then the table is sorted by that particular property. If a predicate is provided, then only objects that satisfy it will be included.

This method only operates on data in memory.

Returns: table

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Methods

get(k)

Parameter	Type
k	*

Returns an individual object by key, where the key should match the result of calling __hash on the contained objects. Unlike the default version, this method operates with O(1) complexity.

This method only operates on data in memory.

Returns: *

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iter()

Returns an iterator that returns all contained objects. The order of the objects is not guaranteed.

This method only operates on data in memory.

Returns: function

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