/*
 * Copyright 2021 Google LLC
 *
 * 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
 *
 *      https://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 com.google.android.apps.exposurenotification.common.time;

import org.threeten.bp.Instant;
import org.threeten.bp.ZonedDateTime;

/**
 * Wrapper for times to use in place of {@link System#currentTimeMillis()}, {@link Instant#now()}
 * or {@link ZonedDateTime#now()}.
 */
public interface Clock {
  /**
   * Replacement for {@link System#currentTimeMillis()}
   */
  long currentTimeMillis();

  /**
   * Replacement for {@link Instant#now()}
   */
  Instant now();

  /**
   * Replacement for {@link ZonedDateTime#now()}
   */
  ZonedDateTime zonedNow();

}
