node-soft-cache

https://www.npmjs.com/package/soft-cache

This library is an utility for caching in node.js. It emerged from the need of having something more than just var cache = {} in JavaScript. This cache behaves as a key value pair, allowing to set an expire timeout in the key/values that are put into the cache.

API

The caching constructor accepts two optional arguments:

• The size of the cache, representing how many elements are allowed in it. Default value is 1000 slots.
• The timeout value in milliseconds that will be used to expire the cache. Default value is 3600000 milliseconds (one hour).

Setting up a new cache

To construct the caching you just need to instantiate a new SoftCache().

var SoftCache = require("soft-cache"),
    softCache = new SoftCache(), // no arguments === default values

Or if you prefer to specify a size and custom timeout (in milliseconds):

    softCache = new SoftCache(SIZE, TIMEOUT);

Puting objects into the cache.

To insert objects you have the .put(key, value) function. This function receives an optional parameter if you want to force a different timeout in milliseconds .put(key, value, timeout).

var someObject = { foo:bar, 1:2 },
cache.put( "key1", someObject );

var someArray = [ 1, 2, 3 ];
cache.put( "key2", someArray );

// adding an object that will expire in 10 seconds
cache.put( "key3", anotherObject, 10000 );

Getting objects from the cache

To get an objet you just need to call .get( "aKey" ). If the item exists it will return itself.

var objectFromCache = cache.get( "key1" );

Removing an object from cache

To remove an object from cache you have available .remove( "someKey" ). This will remove the key value pair from the cache.

cache.remove( "key1" );

Remove all objects from caching

If you need to clear the cache and reset it to an empty state, thus releasing all cached values you can use the .clear().

cache.clear();