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/*
 * Copyright The OpenTelemetry Authors
 * SPDX-License-Identifier: Apache-2.0
 */

package io.opentelemetry.sdk.metrics.internal.state;

import io.opentelemetry.api.common.Attributes;
import io.opentelemetry.context.Context;
import io.opentelemetry.sdk.common.InstrumentationScopeInfo;
import io.opentelemetry.sdk.metrics.data.MetricData;
import io.opentelemetry.sdk.metrics.internal.aggregator.EmptyMetricData;
import io.opentelemetry.sdk.metrics.internal.descriptor.MetricDescriptor;
import io.opentelemetry.sdk.resources.Resource;

final class EmptyMetricStorage implements SynchronousMetricStorage {
  static final EmptyMetricStorage INSTANCE = new EmptyMetricStorage();

  private EmptyMetricStorage() {}

  private final MetricDescriptor descriptor = MetricDescriptor.create("", "", "");

  @Override
  public MetricDescriptor getMetricDescriptor() {
    return descriptor;
  }

  @Override
  public MetricData collect(
      Resource resource,
      InstrumentationScopeInfo instrumentationScopeInfo,
      long startEpochNanos,
      long epochNanos) {
    return EmptyMetricData.getInstance();
  }

  @Override
  public void recordLong(long value, Attributes attributes, Context context) {}

  @Override
  public void recordDouble(double value, Attributes attributes, Context context) {}
}