com.github.tonivade.purefun.effect.util.ZClock Maven / Gradle / Ivy

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/*
 * Copyright (c) 2018-2019, Antonio Gabriel Muñoz Conejo 
 * Distributed under the terms of the MIT License
 */
package com.github.tonivade.purefun.effect.util;

import com.github.tonivade.purefun.Nothing;
import com.github.tonivade.purefun.Unit;
import com.github.tonivade.purefun.effect.UIO;
import com.github.tonivade.purefun.effect.ZIO;

import java.time.Duration;
import java.time.OffsetDateTime;

public interface ZClock {

   ZClock.Service clock();

  static  ZIO currentTime() {
    return ZIO.accessM(env -> env.clock().currentTime());
  }

  static  ZIO currentDateTime() {
    return ZIO.accessM(env -> env.clock().currentDateTime());
  }

  static  ZIO sleep(Duration duration) {
    return ZIO.accessM(env -> env.clock().sleep(duration));
  }

  interface Service {
    ZIO currentTime();
    ZIO currentDateTime();
    ZIO sleep(Duration duration);
  }

  static ZClock live() {
    return new ZClock() {
      @Override
      public  Service clock() {
        return new Service() {

          @Override
          public ZIO currentTime() {
            return UIO.task(System::currentTimeMillis).toZIO();
          }

          @Override
          public ZIO currentDateTime() {
            return UIO.task(OffsetDateTime::now).toZIO();
          }

          @Override
          public ZIO sleep(Duration duration) {
            return UIO.exec(() -> Thread.sleep(duration.toMillis())).toZIO();
          }
        };
      }
    };
  }
}