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* Copyright The OpenTelemetry Authors\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *      https://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  Meter as IMeter,\n  MetricOptions,\n  Histogram,\n  Counter,\n  UpDownCounter,\n  ObservableGauge,\n  ObservableCounter,\n  ObservableUpDownCounter,\n  BatchObservableCallback,\n  Observable,\n} from '@opentelemetry/api';\nimport {\n  createInstrumentDescriptor,\n  InstrumentType,\n} from './InstrumentDescriptor';\nimport {\n  CounterInstrument,\n  GaugeInstrument,\n  HistogramInstrument,\n  ObservableCounterInstrument,\n  ObservableGaugeInstrument,\n  ObservableUpDownCounterInstrument,\n  UpDownCounterInstrument,\n} from './Instruments';\nimport { MeterSharedState } from './state/MeterSharedState';\nimport { Gauge } from './types';\n\n/**\n * This class implements the {@link IMeter} interface.\n */\nexport class Meter implements IMeter {\n  constructor(private _meterSharedState: MeterSharedState) {}\n\n  /**\n   * Create a {@link Gauge} instrument.\n   */\n  createGauge(name: string, options?: MetricOptions): Gauge {\n    const descriptor = createInstrumentDescriptor(\n      name,\n      InstrumentType.GAUGE,\n      options\n    );\n    const storage = this._meterSharedState.registerMetricStorage(descriptor);\n    return new GaugeInstrument(storage, descriptor);\n  }\n\n  /**\n   * Create a {@link Histogram} instrument.\n   */\n  createHistogram(name: string, options?: MetricOptions): Histogram {\n    const descriptor = createInstrumentDescriptor(\n      name,\n      InstrumentType.HISTOGRAM,\n      options\n    );\n    const storage = this._meterSharedState.registerMetricStorage(descriptor);\n    return new HistogramInstrument(storage, descriptor);\n  }\n\n  /**\n   * Create a {@link Counter} instrument.\n   */\n  createCounter(name: string, options?: MetricOptions): Counter {\n    const descriptor = createInstrumentDescriptor(\n      name,\n      InstrumentType.COUNTER,\n      options\n    );\n    const storage = this._meterSharedState.registerMetricStorage(descriptor);\n    return new CounterInstrument(storage, descriptor);\n  }\n\n  /**\n   * Create a {@link UpDownCounter} instrument.\n   */\n  createUpDownCounter(name: string, options?: MetricOptions): UpDownCounter {\n    const descriptor = createInstrumentDescriptor(\n      name,\n      InstrumentType.UP_DOWN_COUNTER,\n      options\n    );\n    const storage = this._meterSharedState.registerMetricStorage(descriptor);\n    return new UpDownCounterInstrument(storage, descriptor);\n  }\n\n  /**\n   * Create a {@link ObservableGauge} instrument.\n   */\n  createObservableGauge(\n    name: string,\n    options?: MetricOptions\n  ): ObservableGauge {\n    const descriptor = createInstrumentDescriptor(\n      name,\n      InstrumentType.OBSERVABLE_GAUGE,\n      options\n    );\n    const storages =\n      this._meterSharedState.registerAsyncMetricStorage(descriptor);\n    return new ObservableGaugeInstrument(\n      descriptor,\n      storages,\n      this._meterSharedState.observableRegistry\n    );\n  }\n\n  /**\n   * Create a {@link ObservableCounter} instrument.\n   */\n  createObservableCounter(\n    name: string,\n    options?: MetricOptions\n  ): ObservableCounter {\n    const descriptor = createInstrumentDescriptor(\n      name,\n      InstrumentType.OBSERVABLE_COUNTER,\n      options\n    );\n    const storages =\n      this._meterSharedState.registerAsyncMetricStorage(descriptor);\n    return new ObservableCounterInstrument(\n      descriptor,\n      storages,\n      this._meterSharedState.observableRegistry\n    );\n  }\n\n  /**\n   * Create a {@link ObservableUpDownCounter} instrument.\n   */\n  createObservableUpDownCounter(\n    name: string,\n    options?: MetricOptions\n  ): ObservableUpDownCounter {\n    const descriptor = createInstrumentDescriptor(\n      name,\n      InstrumentType.OBSERVABLE_UP_DOWN_COUNTER,\n      options\n    );\n    const storages =\n      this._meterSharedState.registerAsyncMetricStorage(descriptor);\n    return new ObservableUpDownCounterInstrument(\n      descriptor,\n      storages,\n      this._meterSharedState.observableRegistry\n    );\n  }\n\n  /**\n   * @see {@link Meter.addBatchObservableCallback}\n   */\n  addBatchObservableCallback(\n    callback: BatchObservableCallback,\n    observables: Observable[]\n  ) {\n    this._meterSharedState.observableRegistry.addBatchCallback(\n      callback,\n      observables\n    );\n  }\n\n  /**\n   * @see {@link Meter.removeBatchObservableCallback}\n   */\n  removeBatchObservableCallback(\n    callback: BatchObservableCallback,\n    observables: Observable[]\n  ) {\n    this._meterSharedState.observableRegistry.removeBatchCallback(\n      callback,\n      observables\n    );\n  }\n}\n"]}