jdb
4dcc4fad25
Sometimes it is useful to capture log messages in a way that is easy for the running program to introspect or manually handle. *BufferLogAppender* captures the logs in a simple array. Be careful, there is no default flush/clear mechanism that runs automatically. Users of BufferLogAppender should take care to render/handle log messages and periodically call `clearBuffer` on the *BufferLogAppender* instance to avoid the buffer array growing without limit.
27 lines
539 B
TypeScript
27 lines
539 B
TypeScript
import type {
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LogLevel,
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LogMessage
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} from './log-message'
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export class BufferLogAppender implements LogAppender {
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public threshold = LogLevel.ALL
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public buffer: LogMessage[]
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constructor(buffer: LogMessage[], threshold?: LogLevel) {
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this.buffer = buffer
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if (threshold) {
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this.threshold = threshold
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}
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}
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public appendMessage(msg: LogMessage): void {
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if (this.threshold && msg.level < this.threshold) return
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else buffer.push(msg)
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}
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public clearBuffer(): void {
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this.buffer.length = 0
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}
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}
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