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100 lines
2.8 KiB
Markdown
100 lines
2.8 KiB
Markdown
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# Class: BalancedPool
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Extends: `undici.Dispatcher`
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A pool of [Pool](Pool.md) instances connected to multiple upstreams.
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Requests are not guaranteed to be dispatched in order of invocation.
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## `new BalancedPool(upstreams [, options])`
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Arguments:
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* **upstreams** `URL | string | string[]` - It should only include the **protocol, hostname, and port**.
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* **options** `BalancedPoolOptions` (optional)
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### Parameter: `BalancedPoolOptions`
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Extends: [`PoolOptions`](Pool.md#parameter-pooloptions)
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* **factory** `(origin: URL, opts: Object) => Dispatcher` - Default: `(origin, opts) => new Pool(origin, opts)`
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The `PoolOptions` are passed to each of the `Pool` instances being created.
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## Instance Properties
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### `BalancedPool.upstreams`
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Returns an array of upstreams that were previously added.
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### `BalancedPool.closed`
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Implements [Client.closed](Client.md#clientclosed)
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### `BalancedPool.destroyed`
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Implements [Client.destroyed](Client.md#clientdestroyed)
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### `Pool.stats`
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Returns [`PoolStats`](PoolStats.md) instance for this pool.
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## Instance Methods
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### `BalancedPool.addUpstream(upstream)`
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Add an upstream.
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Arguments:
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* **upstream** `string` - It should only include the **protocol, hostname, and port**.
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### `BalancedPool.removeUpstream(upstream)`
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Removes an upstream that was previously addded.
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### `BalancedPool.close([callback])`
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Implements [`Dispatcher.close([callback])`](Dispatcher.md#dispatcherclosecallback-promise).
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### `BalancedPool.destroy([error, callback])`
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Implements [`Dispatcher.destroy([error, callback])`](Dispatcher.md#dispatcherdestroyerror-callback-promise).
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### `BalancedPool.connect(options[, callback])`
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See [`Dispatcher.connect(options[, callback])`](Dispatcher.md#dispatcherconnectoptions-callback).
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### `BalancedPool.dispatch(options, handlers)`
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Implements [`Dispatcher.dispatch(options, handlers)`](Dispatcher.md#dispatcherdispatchoptions-handler).
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### `BalancedPool.pipeline(options, handler)`
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See [`Dispatcher.pipeline(options, handler)`](Dispatcher.md#dispatcherpipelineoptions-handler).
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### `BalancedPool.request(options[, callback])`
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See [`Dispatcher.request(options [, callback])`](Dispatcher.md#dispatcherrequestoptions-callback).
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### `BalancedPool.stream(options, factory[, callback])`
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See [`Dispatcher.stream(options, factory[, callback])`](Dispatcher.md#dispatcherstreamoptions-factory-callback).
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### `BalancedPool.upgrade(options[, callback])`
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See [`Dispatcher.upgrade(options[, callback])`](Dispatcher.md#dispatcherupgradeoptions-callback).
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## Instance Events
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### Event: `'connect'`
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See [Dispatcher Event: `'connect'`](Dispatcher.md#event-connect).
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### Event: `'disconnect'`
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See [Dispatcher Event: `'disconnect'`](Dispatcher.md#event-disconnect).
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### Event: `'drain'`
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See [Dispatcher Event: `'drain'`](Dispatcher.md#event-drain).
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