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63 lines
3.1 KiB
63 lines
3.1 KiB
4 years ago
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# deferred-leveldown
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> A mock `abstract-leveldown` implementation that queues operations while a real `abstract-leveldown` instance is being opened.
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[![level badge][level-badge]](https://github.com/Level/awesome)
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[](https://www.npmjs.com/package/deferred-leveldown)
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[](https://www.npmjs.com/package/deferred-leveldown)
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[](https://travis-ci.org/Level/deferred-leveldown)
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[](https://coveralls.io/github/Level/deferred-leveldown)
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[](https://standardjs.com)
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[](https://www.npmjs.com/package/deferred-leveldown)
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[](#backers)
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[](#sponsors)
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`deferred-leveldown` implements the basic [abstract-leveldown](https://github.com/Level/abstract-leveldown) API so it can be used as a drop-in replacement where `leveldown` is needed.
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`put()`, `get()`, `del()`, `batch()` and `clear()` operations are all queued and kept in memory until the `abstract-leveldown`-compatible object has been opened through `deferred-leveldown`'s `open()` method.
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`batch()` operations will all be replayed as the array form. Chained-batch operations are converted before being stored.
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```js
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const deferred = require('deferred-leveldown')
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const leveldown = require('leveldown')
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const db = deferred(leveldown('location'))
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db.put('foo', 'bar', function (err) {
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})
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db.open(function (err) {
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// ...
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})
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```
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**If you are upgrading:** please see [UPGRADING.md](UPGRADING.md).
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## Contributing
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[`Level/deferred-leveldown`](https://github.com/Level/deferred-leveldown) is an **OPEN Open Source Project**. This means that:
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> 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.
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See the [Contribution Guide](https://github.com/Level/community/blob/master/CONTRIBUTING.md) for more details.
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## Donate
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To sustain [`Level`](https://github.com/Level) and its activities, become a backer or sponsor on [Open Collective](https://opencollective.com/level). Your logo or avatar will be displayed on our 28+ [GitHub repositories](https://github.com/Level) and [npm](https://www.npmjs.com/) packages. 💖
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### Backers
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[](https://opencollective.com/level)
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### Sponsors
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[](https://opencollective.com/level)
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## License
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[MIT](LICENSE.md) © 2013-present Rod Vagg and [Contributors](CONTRIBUTORS.md).
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[level-badge]: https://leveljs.org/img/badge.svg
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