/
AsyncFunc.java
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/
AsyncFunc.java
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/**
* The MIT License (MIT)
*
* Copyright (c) 2017 Yegor Bugayenko
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.cactoos.func;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
import org.cactoos.Func;
import org.cactoos.Proc;
/**
* Func that runs in the background.
*
* <p>If you want your piece of code to be executed in the background,
* use {@link AsyncFunc} as following:</p>
*
* <pre> new AsyncFunc(
* input -> input.length()
* ).apply("Hello, world!").get();</pre>
*
* <p>There is no thread-safety guarantee.
*
* @author Yegor Bugayenko (yegor256@gmail.com)
* @version $Id$
* @param <X> Type of input
* @param <Y> Type of output
* @since 0.10
*/
public final class AsyncFunc<X, Y> implements Func<X, Future<Y>> {
/**
* The func.
*/
private final Func<X, Y> func;
/**
* The threads.
*/
private final ThreadFactory factory;
/**
* Ctor.
* @param proc The proc
*/
public AsyncFunc(final Proc<X> proc) {
this(new ProcAsFunc<>(proc));
}
/**
* Ctor.
* @param fnc The func
*/
public AsyncFunc(final Func<X, Y> fnc) {
this(fnc, Executors.defaultThreadFactory());
}
/**
* Ctor.
* @param proc The proc
* @param fct Factory
*/
public AsyncFunc(final Proc<X> proc, final ThreadFactory fct) {
this(new ProcAsFunc<>(proc), fct);
}
/**
* Ctor.
* @param fnc The func
* @param fct Factory
*/
public AsyncFunc(final Func<X, Y> fnc, final ThreadFactory fct) {
this.func = fnc;
this.factory = fct;
}
@Override
public Future<Y> apply(final X input) throws Exception {
return Executors.newSingleThreadExecutor(this.factory).submit(
() -> this.func.apply(input)
);
}
}