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For production use, please consider using the {@link BatchSpanProcessor} instead.\n */\nexport class SimpleSpanProcessor implements SpanProcessor {\n  private readonly _exporter: SpanExporter;\n  private readonly _metrics: SpanProcessorMetrics;\n  private _shutdownOnce: BindOnceFuture<void>;\n  private _pendingExports: Set<Promise<void>>;\n\n  constructor(options: SimpleSpanProcessorOptions) {\n    this._exporter = options.exporter;\n    this._shutdownOnce = new BindOnceFuture(this._shutdown, this);\n    this._pendingExports = new Set<Promise<void>>();\n\n    const meter = options.selfObsMeterProvider\n      ? options.selfObsMeterProvider.getMeter('@opentelemetry/sdk-trace')\n      : createNoopMeter();\n    this._metrics = new SpanProcessorMetrics(\n      OTEL_COMPONENT_TYPE_VALUE_SIMPLE_SPAN_PROCESSOR,\n      meter\n    );\n  }\n\n  async forceFlush(): Promise<void> {\n    let pendingExportError: unknown;\n    let pendingExportRejected = false;\n    try {\n      await Promise.all(Array.from(this._pendingExports));\n    } catch (err) {\n      pendingExportError = err;\n      pendingExportRejected = true;\n    }\n    if (this._exporter.forceFlush) {\n      await this._exporter.forceFlush();\n    }\n    if (pendingExportRejected) {\n      throw pendingExportError;\n    }\n  }\n\n  onStart(_span: Span, _parentContext: Context): void {}\n\n  onEnd(span: ReadableSpan): void {\n    if (this._shutdownOnce.isCalled) {\n      return;\n    }\n\n    if ((span.spanContext().traceFlags & TraceFlags.SAMPLED) === 0) {\n      return;\n    }\n\n    const pendingExport = this._doExport(span);\n    // Enqueue this export to the pending list so it can be flushed by the user.\n    this._pendingExports.add(pendingExport);\n    void pendingExport.then(\n      () => {\n        this._pendingExports.delete(pendingExport);\n      },\n      err => {\n        globalErrorHandler(err);\n        this._pendingExports.delete(pendingExport);\n      }\n    );\n  }\n\n  private async _doExport(span: ReadableSpan): Promise<void> {\n    if (span.resource.asyncAttributesPending) {\n      // Ensure resource is fully resolved before exporting.\n      await span.resource.waitForAsyncAttributes?.();\n    }\n\n    const result = await internal._export(this._exporter, [span]);\n    this._metrics.finishSpans(1, result.error);\n    if (result.code !== ExportResultCode.SUCCESS) {\n      throw (\n        result.error ??\n        new Error(`SimpleSpanProcessor: span export failed (status ${result})`)\n      );\n    }\n  }\n\n  shutdown(): Promise<void> {\n    return this._shutdownOnce.call();\n  }\n\n  private _shutdown(): Promise<void> {\n    this._metrics.shutdown();\n    return this._exporter.shutdown();\n  }\n}\n"]}