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Merge pull request #1388 from emeraldpay/fix/slow-history-update
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| /** | ||
| * A handler that buffers incoming data and flushes it to the handler when the buffer is full or a certain time has passed. | ||
| */ | ||
| export class BufferedHandler<T> { | ||
|
|
||
| /** | ||
| * The maximum size of the buffer before it is flushed. | ||
| * @private | ||
| */ | ||
| private readonly limitSize: number = 100; | ||
|
|
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| /** | ||
| * The maximum time in milliseconds before the buffer is flushed. | ||
| * @private | ||
| */ | ||
| private readonly limitTimeMs: number = 250; | ||
| /** | ||
| * The handler that is called when the buffer is flushed. | ||
| * @private | ||
| */ | ||
| private readonly handler: (values: T[]) => Promise<void>; | ||
|
|
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| private buffer: T[] = []; | ||
| private closed = false; | ||
| private lastFlush = Date.now(); | ||
|
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| constructor(handler: (values: T[]) => Promise<void>, limitSize?: number, limitTimeMs?: number) { | ||
| this.handler = handler; | ||
| if (limitSize != null) { | ||
| this.limitSize = limitSize; | ||
| } | ||
| if (limitTimeMs != null) { | ||
| this.limitTimeMs = limitTimeMs; | ||
| } | ||
| } | ||
|
|
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| start() { | ||
| this.scheduleNext(); | ||
| } | ||
|
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| private scheduleNext() { | ||
| setTimeout(() => { | ||
| if (this.lastFlush + this.limitTimeMs >= Date.now()) { | ||
| this.flush(); | ||
| } | ||
| if (!this.closed) { | ||
| this.scheduleNext(); | ||
| } | ||
| }, this.limitTimeMs - (Date.now() - this.lastFlush)); | ||
| } | ||
|
|
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| accept(): (tx: T) => void { | ||
| return (tx) => this.onData(tx); | ||
| } | ||
|
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| onData(tx: T): void { | ||
| this.buffer.push(tx); | ||
| if (this.buffer.length >= this.limitSize) { | ||
| this.flush(); | ||
| } | ||
| } | ||
|
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| flush(): void { | ||
| if (this.buffer.length > 0) { | ||
| this.handler(this.buffer) | ||
| .catch((e) => console.error('Error while handling buffer', e)); | ||
| } | ||
| this.buffer = []; | ||
| this.lastFlush = Date.now(); | ||
| } | ||
|
|
||
| close() { | ||
| this.flush(); | ||
| this.closed = true; | ||
| } | ||
| } |
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