Cache

cache/Cache~ Cache

The cache provides a temporary storage for expirable information. The primary use of a cache is caching information obtained via costly means (CPU-heavy computation or networking) to speed up the application's performance when the same information needs to be retrieved multiple times.

Methods

clear()

Source:
Clears the cache by deleting all entries.

delete(key)

Source:
Deletes the specified cache entry. The method has no effect if the entry does not exist.
Parameters:
Name Type Description
key string The identifier of the cache entry.

deserialize(serializedData)

Source:
Loads the provided serialized cache data into this cache. Entries present in this cache but not specified in the provided data will remain in this cache intact.
Parameters:
Name Type Description
serializedData Object.<string, {value: *, ttl: number}> An object representing the state of the cache to load, obtained by parsing the JSON string returned by the serialize method.

disable()

Source:
Disables the cache, preventing the retrieval of any cached entries and reporting all cache entries as non-existing. Disabling the cache does not however prevent modifying the existing or creating new cache entries. Disabling the cache also clears all of its current entries. The method has no effect if the cache is already disabled.

enable()

Source:
Enables the cache, allowing the retrieval of cache entries. The method has no effect if the cache is already enabled.

get(key) → {*}

Source:
Returns the value of the entry identified by the specified key. The method returns null if the specified entry does not exist, has already expired, or the cache is currently disabled.
Parameters:
Name Type Description
key string The identifier of the cache entry.
Returns:
The value of the specified cache entry, or null if the entry is not available.
Type
*

has(key) → {boolean}

Source:
Tests whether the cache contains a fresh entry for the specified key. A cache entry is fresh if the has not expired its TTL (time to live). The method always returns false if the cache is currently disabled.
Parameters:
Name Type Description
key string The identifier of the cache entry.
Returns:
true if the cache is enabled, the entry exists and has not expired yet.
Type
boolean

serialize() → {string}

Source:
Exports the state of this cache to an HTML-safe JSON string. The data obtained by parsing the result of this method are compatible with the deserialize() method.
Returns:
A JSON string containing an object representing of the current state of this cache.
Type
string

set(key, value, ttlopt, nullable)

Source:
Sets the cache entry identified by the specified key to the provided value. The entry is created if it does not exist yet. The method has no effect if the cache is currently disabled.
Parameters:
Name Type Attributes Default Description
key string The identifier of the cache entry.
value * The cache entry value.
ttl number <optional>
<nullable>
null Cache entry time to live in milliseconds. The entry will expire after the specified amount of milliseconds. Use null or omit the parameter to use the default TTL of this cache.