com.github.tonivade.purefun.instances.UIOInstances Maven / Gradle / Ivy

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/*
 * Copyright (c) 2018-2020, Antonio Gabriel Muñoz Conejo 
 * Distributed under the terms of the MIT License
 */
package com.github.tonivade.purefun.instances;

import static com.github.tonivade.purefun.concurrent.FutureOf.toFuture;
import static com.github.tonivade.purefun.effect.UIOOf.toUIO;
import static com.github.tonivade.purefun.instances.FutureInstances.async;

import java.time.Duration;
import java.util.concurrent.Executor;

import com.github.tonivade.purefun.Consumer1;
import com.github.tonivade.purefun.Function1;
import com.github.tonivade.purefun.Kind;
import com.github.tonivade.purefun.Producer;
import com.github.tonivade.purefun.Unit;
import com.github.tonivade.purefun.concurrent.Future;
import com.github.tonivade.purefun.effect.UIO;
import com.github.tonivade.purefun.effect.UIOOf;
import com.github.tonivade.purefun.effect.UIO_;
import com.github.tonivade.purefun.typeclasses.Applicative;
import com.github.tonivade.purefun.typeclasses.Bracket;
import com.github.tonivade.purefun.typeclasses.Console;
import com.github.tonivade.purefun.typeclasses.Defer;
import com.github.tonivade.purefun.typeclasses.Functor;
import com.github.tonivade.purefun.typeclasses.Monad;
import com.github.tonivade.purefun.typeclasses.MonadDefer;
import com.github.tonivade.purefun.typeclasses.MonadError;
import com.github.tonivade.purefun.typeclasses.MonadThrow;
import com.github.tonivade.purefun.typeclasses.Runtime;

public interface UIOInstances {

  static Functor functor() {
    return UIOFunctor.INSTANCE;
  }

  static Applicative applicative() {
    return UIOApplicative.INSTANCE;
  }

  static Monad monad() {
    return UIOMonad.INSTANCE;
  }

  static MonadError monadError() {
    return UIOMonadError.INSTANCE;
  }

  static MonadThrow monadThrow() {
    return UIOMonadThrow.INSTANCE;
  }

  static MonadDefer monadDefer() {
    return UIOMonadDefer.INSTANCE;
  }
  
  static Runtime runtime() {
    return UIORuntime.INSTANCE;
  }
  
  static Console console() {
    return UIOConsole.INSTANCE;
  }
}

interface UIOFunctor extends Functor {

  UIOFunctor INSTANCE = new UIOFunctor() {};

  @Override
  default  UIO map(Kind value, Function1 map) {
    return UIOOf.narrowK(value).map(map);
  }
}

interface UIOPure extends Applicative {

  @Override
  default  UIO pure(A value) {
    return UIO.pure(value);
  }
}

interface UIOApplicative extends UIOPure {

  UIOApplicative INSTANCE = new UIOApplicative() {};

  @Override
  default  UIO ap(Kind value, 
      Kind> apply) {
    return value.fix(UIOOf::narrowK).ap(apply.fix(UIOOf::narrowK));
  }
}

interface UIOMonad extends UIOPure, Monad {

  UIOMonad INSTANCE = new UIOMonad() {};

  @Override
  default  UIO flatMap(Kind value, 
      Function1> map) {
    return value.fix(toUIO()).flatMap(map.andThen(UIOOf::narrowK));
  }
}

interface UIOMonadError extends UIOMonad, MonadError {

  UIOMonadError INSTANCE = new UIOMonadError() {};

  @Override
  default  UIO raiseError(Throwable error) {
    return UIO.raiseError(error);
  }

  @Override
  default  UIO handleErrorWith(
      Kind value,
      Function1> handler) {
    Function1> mapError = handler.andThen(UIOOf::narrowK);
    Function1> map = UIO::pure;
    UIO uio = UIOOf.narrowK(value);
    return uio.redeemWith(mapError, map);
  }
}

interface UIOMonadThrow extends UIOMonadError, MonadThrow {

  UIOMonadThrow INSTANCE = new UIOMonadThrow() {};
}

interface UIODefer extends Defer {

  @Override
  default  UIO
          defer(Producer> defer) {
    return UIO.defer(() -> defer.map(UIOOf::narrowK).get());
  }
}

interface UIOBracket extends UIOMonadError, Bracket {

  @Override
  default  UIO
          bracket(Kind acquire,
                  Function1> use,
                  Consumer1 release) {
    return UIO.bracket(acquire.fix(toUIO()), use.andThen(UIOOf::narrowK), release);
  }
}

interface UIOMonadDefer
    extends MonadDefer, UIODefer, UIOBracket {

  UIOMonadDefer INSTANCE = new UIOMonadDefer() {};

  @Override
  default UIO sleep(Duration duration) {
    return UIO.sleep(duration);
  }
}

final class UIOConsole implements Console {

  public static final UIOConsole INSTANCE = new UIOConsole();

  private final SystemConsole console = new SystemConsole();

  @Override
  public UIO readln() {
    return UIO.task(console::readln);
  }

  @Override
  public UIO println(String text) {
    return UIO.exec(() -> console.println(text));
  }
}

interface UIORuntime extends Runtime {
  
  UIORuntime INSTANCE = new UIORuntime() {};

  @Override
  default  T run(Kind value) {
    return value.fix(toUIO()).unsafeRunSync();
  }

  @Override
  default  Future parRun(Kind value, Executor executor) {
    return value.fix(toUIO()).foldMap(async(executor)).fix(toFuture());
  }
}