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cache-point
Advanced tools
A memoisation solution intended to cache the output of expensive operations, speeding up future invocations with the same input.
Example
const Cache = require('cache-point')
const cache = new Cache({ dir: 'tmp/example' })
// The first invocation will take 3s, the rest instantaneous.
// outputs: 'result'
getData('some input')
.then(console.log)
// check the cache for output generated with this input.
// cache.read() will resolve on hit, reject on miss.
function getData (input) {
return cache
.read(input)
.catch(() => expensiveOperation(input))
}
// The expensive operation we're aiming to avoid,
// (3 second cost per invocation)
function expensiveOperation (input) {
return new Promise((resolve, reject) => {
setTimeout(() => {
const output = 'result'
cache.write(input, output)
resolve(output)
}, 3000)
})
}
string
Promise
string
Promise
string
Promise
Promise
Param | Type |
---|---|
[options] | object |
[options.dir] | string |
string
Current cache directory. Can be changed at any time.
Kind: instance property of Cache
Promise
A cache hit resolves with the stored value, a miss rejects.
Kind: instance method of Cache
Param | Type | Description |
---|---|---|
keys | * | One or more values to uniquely identify the data. Can be any value, or an array of values of any type. |
string
A cache hit returns the stored value, a miss returns null
.
Kind: instance method of Cache
Param | Type | Description |
---|---|---|
keys | * | One or more values to uniquely identify the data. Can be any value, or an array of values of any type. |
Promise
Write some data to the cache. Returns a promise which resolves when the write is complete.
Kind: instance method of Cache
Param | Type | Description |
---|---|---|
keys | * | One or more values to index the data, e.g. a request object or set of function args. |
content | * | the data to store |
Write some data to the cache with a key.
Kind: instance method of Cache
Param | Type | Description |
---|---|---|
keys | * | One or more values to index the data, e.g. a request object or set of function args. |
content | * | the data to store |
string
Used internally to convert a key value into a hex checksum. Override if for some reason you need a different hashing strategy.
Kind: instance method of Cache
Param | Type | Description |
---|---|---|
keys | * | One or more values to index the data, e.g. a request object or set of function args. |
Promise
Clears the cache. Returns a promise which resolves once the cache is clear.
Kind: instance method of Cache
Promise
Clears and removes the cache directory. Returns a promise which resolves once the remove is complete.
Kind: instance method of Cache
© 2016 Lloyd Brookes <75pound@gmail.com>. Documented by jsdoc-to-markdown.
FAQs
Simple, filesystem-backed memoisation cache.
The npm package cache-point receives a total of 118,580 weekly downloads. As such, cache-point popularity was classified as popular.
We found that cache-point demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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