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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  context as contextApi,\n  diag,\n  Context,\n  MetricAttributes,\n  ValueType,\n  UpDownCounter,\n  Counter,\n  Histogram,\n  Observable,\n  ObservableCallback,\n  ObservableCounter,\n  ObservableGauge,\n  ObservableUpDownCounter,\n} from '@opentelemetry/api';\nimport { millisToHrTime } from '@opentelemetry/core';\nimport { InstrumentDescriptor } from './InstrumentDescriptor';\nimport { ObservableRegistry } from './state/ObservableRegistry';\nimport {\n  AsyncWritableMetricStorage,\n  WritableMetricStorage,\n} from './state/WritableMetricStorage';\nimport { Gauge } from './types';\n\nexport class SyncInstrument {\n  constructor(\n    private _writableMetricStorage: WritableMetricStorage,\n    protected _descriptor: InstrumentDescriptor\n  ) {}\n\n  protected _record(\n    value: number,\n    attributes: MetricAttributes = {},\n    context: Context = contextApi.active()\n  ) {\n    if (typeof value !== 'number') {\n      diag.warn(\n        `non-number value provided to metric ${this._descriptor.name}: ${value}`\n      );\n      return;\n    }\n    if (\n      this._descriptor.valueType === ValueType.INT &&\n      !Number.isInteger(value)\n    ) {\n      diag.warn(\n        `INT value type cannot accept a floating-point value for ${this._descriptor.name}, ignoring the fractional digits.`\n      );\n      value = Math.trunc(value);\n      // ignore non-finite values.\n      if (!Number.isInteger(value)) {\n        return;\n      }\n    }\n    this._writableMetricStorage.record(\n      value,\n      attributes,\n      context,\n      millisToHrTime(Date.now())\n    );\n  }\n}\n\n/**\n * The class implements {@link UpDownCounter} interface.\n */\nexport class UpDownCounterInstrument\n  extends SyncInstrument\n  implements UpDownCounter\n{\n  /**\n   * Increment value of counter by the input. Inputs may be negative.\n   */\n  add(value: number, attributes?: MetricAttributes, ctx?: Context): void {\n    this._record(value, attributes, ctx);\n  }\n}\n\n/**\n * The class implements {@link Counter} interface.\n */\nexport class CounterInstrument extends SyncInstrument implements Counter {\n  /**\n   * Increment value of counter by the input. Inputs may not be negative.\n   */\n  add(value: number, attributes?: MetricAttributes, ctx?: Context): void {\n    if (value < 0) {\n      diag.warn(\n        `negative value provided to counter ${this._descriptor.name}: ${value}`\n      );\n      return;\n    }\n\n    this._record(value, attributes, ctx);\n  }\n}\n\n/**\n * The class implements {@link Gauge} interface.\n */\nexport class GaugeInstrument extends SyncInstrument implements Gauge {\n  /**\n   * Records a measurement.\n   */\n  record(value: number, attributes?: MetricAttributes, ctx?: Context): void {\n    this._record(value, attributes, ctx);\n  }\n}\n\n/**\n * The class implements {@link Histogram} interface.\n */\nexport class HistogramInstrument extends SyncInstrument implements Histogram {\n  /**\n   * Records a measurement. Value of the measurement must not be negative.\n   */\n  record(value: number, attributes?: MetricAttributes, ctx?: Context): void {\n    if (value < 0) {\n      diag.warn(\n        `negative value provided to histogram ${this._descriptor.name}: ${value}`\n      );\n      return;\n    }\n    this._record(value, attributes, ctx);\n  }\n}\n\nexport class ObservableInstrument implements Observable {\n  /** @internal */\n  _metricStorages: AsyncWritableMetricStorage[];\n  /** @internal */\n  _descriptor: InstrumentDescriptor;\n\n  constructor(\n    descriptor: InstrumentDescriptor,\n    metricStorages: AsyncWritableMetricStorage[],\n    private _observableRegistry: ObservableRegistry\n  ) {\n    this._descriptor = descriptor;\n    this._metricStorages = metricStorages;\n  }\n\n  /**\n   * @see {Observable.addCallback}\n   */\n  addCallback(callback: ObservableCallback) {\n    this._observableRegistry.addCallback(callback, this);\n  }\n\n  /**\n   * @see {Observable.removeCallback}\n   */\n  removeCallback(callback: ObservableCallback) {\n    this._observableRegistry.removeCallback(callback, this);\n  }\n}\n\nexport class ObservableCounterInstrument\n  extends ObservableInstrument\n  implements ObservableCounter {}\nexport class ObservableGaugeInstrument\n  extends ObservableInstrument\n  implements ObservableGauge {}\nexport class ObservableUpDownCounterInstrument\n  extends ObservableInstrument\n  implements ObservableUpDownCounter {}\n\nexport function isObservableInstrument(\n  it: unknown\n): it is ObservableInstrument {\n  return it instanceof ObservableInstrument;\n}\n"]}