core/cache/restricted

This module provides a class for a Cache data structure with support for limiting of values in the cache. The structure' constructor takes how many values can be stored in the cache (by default, it equals 20).

import RestrictedCache from 'core/cache/restricted';

const
  cache = new RestrictedCache(3);

cache.set('foo1', 'bar1');
cache.set('foo2', 'bar2');
cache.set('foo3', 'bar3');

console.log(cache.size); // 3
console.log(cache.has('foo1')); // true

cache.set('foo4', 'bar4');

console.log(cache.size); // 3
console.log(cache.has('foo1')); // false
console.log(cache.has('foo4')); // true

// Modify the cache' capacity
cache.setCapacity(5);

cache.set('foo5', 'bar5');
cache.set('foo6', 'bar6');

console.log(cache.size); // 5

cache.setCapacity(3);

console.log(cache.size); // 3
console.log(cache.has('foo2')); // false
console.log(cache.has('foo3')); // false

API

See Cache.

setCapacity

Sets a new capacity of the cache. The method returns a map of truncated elements that the cache can't fit anymore.

import RestrictedCache from 'core/cache/restricted';

// The constructor takes a number of maximum values in the cache

const
  cache = new RestrictedCache(3);

cache.set('foo1', 'bar1');
cache.set('foo2', 'bar2');
cache.set('foo3', 'bar3');

// Map([['foo1', 'bar1], ['foo2', 'bar2']])
console.log(cache.setCapacity(1));

console.log(cache.size); // 1