DeferredLevelDOWN
=================

**A mock LevelDOWN implementation that queues operations while a real LevelDOWN instance is being opened.**

![LevelDB Logo](https://twimg0-a.akamaihd.net/profile_images/3360574989/92fc472928b444980408147e5e5db2fa_bigger.png)

[![Build Status](https://secure.travis-ci.org/Level/deferred-leveldown.png)](http://travis-ci.org/rvagg/deferred-leveldown)

[![NPM](https://nodei.co/npm/deferred-leveldown.png?compact)](https://nodei.co/npm/deferred-leveldown/)

**DeferredLevelDOWN** implements the basic [AbstractLevelDOWN](https://github.com/rvagg/node-abstract-leveldown) API so it can be used as a drop-in replacement where LevelDOWN is needed.

`put()`, `get()`, `del()` and `batch()` operations are all queued and kept in memory until a new LevelDOWN-compatible object can be supplied.

The `setDb(db)` method is used to supply a new LevelDOWN object. Once received, all queued operations are replayed against that object, in order.

`batch()` operations will all be replayed as the array form. Chained-batch operations are converted before being stored.

Contributing
------------

DeferredLevelDOWN is an **OPEN Open Source Project**. This means that:

> Individuals making significant and valuable contributions are given commit-access to the project to contribute as they see fit. This project is more like an open wiki than a standard guarded open source project.

See the [CONTRIBUTING.md](https://github.com/rvagg/node-levelup/blob/master/CONTRIBUTING.md) file for more details.

### Contributors

DeferredLevelDOWN is only possible due to the excellent work of the following contributors:

<table><tbody>
<tr><th align="left">Rod Vagg</th><td><a href="https://github.com/rvagg">GitHub/rvagg</a></td><td><a href="http://twitter.com/rvagg">Twitter/@rvagg</a></td></tr>
<tr><th align="left">John Chesley</th><td><a href="https://github.com/chesles/">GitHub/chesles</a></td><td><a href="http://twitter.com/chesles">Twitter/@chesles</a></td></tr>
<tr><th align="left">Jake Verbaten</th><td><a href="https://github.com/raynos">GitHub/raynos</a></td><td><a href="http://twitter.com/raynos2">Twitter/@raynos2</a></td></tr>
<tr><th align="left">Dominic Tarr</th><td><a href="https://github.com/dominictarr">GitHub/dominictarr</a></td><td><a href="http://twitter.com/dominictarr">Twitter/@dominictarr</a></td></tr>
<tr><th align="left">Max Ogden</th><td><a href="https://github.com/maxogden">GitHub/maxogden</a></td><td><a href="http://twitter.com/maxogden">Twitter/@maxogden</a></td></tr>
<tr><th align="left">Lars-Magnus Skog</th><td><a href="https://github.com/ralphtheninja">GitHub/ralphtheninja</a></td><td><a href="http://twitter.com/ralphtheninja">Twitter/@ralphtheninja</a></td></tr>
<tr><th align="left">David Björklund</th><td><a href="https://github.com/kesla">GitHub/kesla</a></td><td><a href="http://twitter.com/david_bjorklund">Twitter/@david_bjorklund</a></td></tr>
<tr><th align="left">Julian Gruber</th><td><a href="https://github.com/juliangruber">GitHub/juliangruber</a></td><td><a href="http://twitter.com/juliangruber">Twitter/@juliangruber</a></td></tr>
<tr><th align="left">Paolo Fragomeni</th><td><a href="https://github.com/hij1nx">GitHub/hij1nx</a></td><td><a href="http://twitter.com/hij1nx">Twitter/@hij1nx</a></td></tr>
<tr><th align="left">Anton Whalley</th><td><a href="https://github.com/No9">GitHub/No9</a></td><td><a href="https://twitter.com/antonwhalley">Twitter/@antonwhalley</a></td></tr>
<tr><th align="left">Matteo Collina</th><td><a href="https://github.com/mcollina">GitHub/mcollina</a></td><td><a href="https://twitter.com/matteocollina">Twitter/@matteocollina</a></td></tr>
<tr><th align="left">Pedro Teixeira</th><td><a href="https://github.com/pgte">GitHub/pgte</a></td><td><a href="https://twitter.com/pgte">Twitter/@pgte</a></td></tr>
<tr><th align="left">James Halliday</th><td><a href="https://github.com/substack">GitHub/substack</a></td><td><a href="https://twitter.com/substack">Twitter/@substack</a></td></tr>
</tbody></table>

<a name="licence"></a>
Licence &amp; copyright
-------------------

Copyright (c) 2013 DeferredLevelDOWN contributors (listed above).

DeferredLevelDOWN is licensed under an MIT +no-false-attribs license. All rights not explicitly granted in the MIT license are reserved. See the included LICENSE file for more details.