swap-to-level

swap-to-level

Key value store that holds datasets in memory until they reach a given size and then swaps them to leveldb

npm install swap-to-level

Usage

var swap = require('swap-to-level')
var store = swap(db, {max: 5}) // where db is a levelup

store.put('hello', 'world', function (err) {
  // will store 'world' in memory
})

... insert 4 more values ...

store.put('another', 'one', function (err) {
  // since we inserted 6 values ALL of the inserted data have
  // been swapped to being stored in leveldb instead of memory
})

API

store = swap(db, [options])

Create a new memswap instance. Options include:

{
  max: 10, // Max keys stored before swapping. Defaults to Infinity
  valueEncoding: ... // Set a leveldb valueEncoding to use
}

store.put(key, value, [cb])

Insert a value in the store.

store.get(key, cb)

Get a value from the store. If the key does not exist an error is returned with err.notFound === true

store.del(key, [cb])

Delete a value from the store.

store.on('swap', fn)

Emitted when the values are swapped from memory to leveldb. Happens if the swap contains more than max values.

License

MIT