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Resource.empty()\n );\n this._sharedState = new MeterProviderSharedState(resource);\n if (options?.views != null && options.views.length > 0) {\n for (const view of options.views) {\n this._sharedState.viewRegistry.addView(view);\n }\n }\n\n if (options?.readers != null && options.readers.length > 0) {\n for (const metricReader of options.readers) {\n this.addMetricReader(metricReader);\n }\n }\n }\n\n /**\n * Get a meter with the configuration of the MeterProvider.\n */\n getMeter(name: string, version = '', options: MeterOptions = {}): IMeter {\n // https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#meter-creation\n if (this._shutdown) {\n diag.warn('A shutdown MeterProvider cannot provide a Meter');\n return createNoopMeter();\n }\n\n return this._sharedState.getMeterSharedState({\n name,\n version,\n schemaUrl: options.schemaUrl,\n }).meter;\n }\n\n /**\n * Register a {@link MetricReader} to the meter provider. After the\n * registration, the MetricReader can start metrics collection.\n *\n * <p> NOTE: {@link MetricReader} instances MUST be added before creating any instruments.\n * A {@link MetricReader} instance registered later may receive no or incomplete metric data.\n *\n * @param metricReader the metric reader to be registered.\n *\n * @deprecated This method will be removed in SDK 2.0. Please use\n * {@link MeterProviderOptions.readers} via the {@link MeterProvider} constructor instead\n */\n addMetricReader(metricReader: MetricReader) {\n const collector = new MetricCollector(this._sharedState, metricReader);\n metricReader.setMetricProducer(collector);\n this._sharedState.metricCollectors.push(collector);\n }\n\n /**\n * Flush all buffered data and shut down the MeterProvider and all registered\n * MetricReaders.\n *\n * Returns a promise which is resolved when all flushes are complete.\n */\n async shutdown(options?: ShutdownOptions): Promise<void> {\n if (this._shutdown) {\n diag.warn('shutdown may only be called once per MeterProvider');\n return;\n }\n\n this._shutdown = true;\n\n await Promise.all(\n this._sharedState.metricCollectors.map(collector => {\n return collector.shutdown(options);\n })\n );\n }\n\n /**\n * Notifies all registered MetricReaders to flush any buffered data.\n *\n * Returns a promise which is resolved when all flushes are complete.\n */\n async forceFlush(options?: ForceFlushOptions): Promise<void> {\n // do not flush after shutdown\n if (this._shutdown) {\n diag.warn('invalid attempt to force flush after MeterProvider shutdown');\n return;\n }\n\n await Promise.all(\n this._sharedState.metricCollectors.map(collector => {\n return collector.forceFlush(options);\n })\n );\n }\n}\n"]} |