databank-lrucache

databank-lrucache

This is a Databank for using the lru-cache package as simple caching mechanism. It works best with the caching databank class.

License

Copyright 2013 E14N https://e14n.com/

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Usage

To create an lru-cache databank, use the Databank.get() method:

var Databank = require('databank').Databank;

var db = Databank.get('lrucache', {});

Note that the registered name is 'lrucache' (no hyphen). That's just the way the Databank driver mechanism works.

The driver passes its parameters through to the lru-cache constructor.

• max The maximum size of the cache. Default Infinity, which is kind of pointless.
• maxAge Maximum age of an item in ms. Default is null, meaning to not expire items.

You probably want to use the caching pattern driver to get the most out of this, in which case you'd do something like:

var Databank = require('databank').Databank;

params = {
    source: {
        driver: "disk",
        params: {dir: "/var/local/somedir"}
    },
    cache: {
        driver: "lrucache",
        params: {max: 10000000}
    }
};

var db = Databank.get('caching', params);

This will create a databank that uses the disk as the main store but caches 10Mb of data in the LRU cache.

Bugs

Report bugs through Github.

See https://github.com/e14n/databank-lrucache/issues