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Lightstep OpenTelemetry Auto Exporter

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/*
 * Copyright 2019, OpenTelemetry Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.opentelemetry.sdk.common;

/**
 * Interface for getting the current time.
 *
 * @since 0.1.0
 */
public interface Clock {
  /**
   * Obtains the current epoch timestamp in nanos from this clock.
   *
   * @return the current epoch timestamp in nanos.
   * @since 0.1.0
   */
  long now();

  /**
   * Returns a time measurement with nanosecond precision that can only be used to calculate elapsed
   * time.
   *
   * @return a time measurement with nanosecond precision that can only be used to calculate elapsed
   *     time.
   * @since 0.1.0
   */
  long nanoTime();
}