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• FutureIORuntime.java

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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.runtimes;

import static com.github.tonivade.purefun.instances.FutureInstances.monadDefer;
import static java.util.Objects.requireNonNull;

import java.util.concurrent.Executor;

import com.github.tonivade.purefun.concurrent.Future;
import com.github.tonivade.purefun.monad.IO;
import com.github.tonivade.purefun.monad.IORuntime;

public class FutureIORuntime implements IORuntime {

  private final Executor executor;

  public FutureIORuntime() {
    this(Future.DEFAULT_EXECUTOR);
  }

  public FutureIORuntime(Executor executor) {
    this.executor = requireNonNull(executor);
  }

  @Override
  public  Future run(IO effect) {
    return effect.foldMap(monadDefer(executor)).fix1(Future::narrowK);
  }
}