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@koopjs/cache-memory
Advanced tools
This is a LRU cache with ttl (time to live) expiry. It expects cache items to be GeoJSON feature collections. It is based on quick-lru.
Cache eviction occurs in two ways:
const Cache = require('@koopjs/cache-memory');
const cache = new Cache({ size: 1000 });
This is the default cache for Koop so you won't need to instantiate it yourself. If you really wanted to, it would look like this:
const Koop = require('koop')
const koop = new Koop()
const cache = require('@koopjs/cache-memory')
koop.register(cache, { size: 1000 })
size
: the maximum number of items to store in the queue before evicting the least recently used item.
The cache is a JavaScript object that lives in-memory. It is used to store geojson features.
insert
Insert geojson into the cache.
const geojson = {
type: 'FeatureCollection',
features: [],
metadata: {
name: 'Example GeoJSON',
description: 'This is geojson that will be stored in the cache'
}
}
const options = {
ttl: 1000 // The TTL option is measured in seconds, it will be used to set the `maxAge` property in the LRU cache
}
cache.insert('key', geojson, options, err => {
// This function will call back with an error if one occurs
})
retrieve
Retrieve a cached feature collection.
const options = {
pick: [] // an array of keys used to return a subset of the feature collections root level properties
omit
}
cache.retrieve('key', options, (err, geojson) => {
/* This function will callback with an error or the data cached with the passed key. It will return undefined if not found or expired.
{
type: 'FeatureCollection',
features: [],
metadata: {}
}
*/
})
delete
Remove a feature collection from the cache
cache.delete('key', err => {
// This function will call back with an error if one occurs
})
FAQs
An in-memory cache for KOop
We found that @koopjs/cache-memory demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 7 open source maintainers collaborating on the project.
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