javascalautils.concurrent.FutureCompanion Maven / Gradle / Ivy
/**
* Copyright 2015 Peter Nerg
*
* 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
*
* http://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 javascalautils.concurrent;
import javascalautils.ThrowableFunction0;
/**
* Acts as a Scala type companion object for {@link Future}.
* The primary purpose is to get the Scala feel of instantiating classes.
* In Scala you can define a companion object for a class, acting as a static reference/singleton for that class allowing you do define factory methods.
* One use case is to define methods with the same name as the class and let these methods invoke the constructor thus creating a nice way to create instances
* without using the word "new".
* This can be achieved in java by statically importing a method and then using it.
* The limitation is that classes may not have method with the same name as the class itself hence new companion classes have to be created.
* To be able to use it in a neat concise way one needs to statically import the method.
*
*
* import static javascalautils.FutureCompanion.Future;
*
* Future<Integer> resultSuccess = Future(() -> 9 / 3); // The Future will at some point contain: Success(3)
* Future<Integer> resultFailure = Future(() -> 9 / 0); // The Future will at some point contain: Failure(ArithmeticException)
*
*
*
*
* @author Peter Nerg
* @since 1.3
*/
public final class FutureCompanion {
private FutureCompanion() {
}
/**
* Allows for easy creation of asynchronous computations that will be executed in the future.
* The method relay the execution to {@link Future#apply(ThrowableFunction0)}.
* Best used in conjunction with statically importing this method.
*
*
*
*
* import static javascalautils.concurrent.FutureCompanion.Future;
*
* Future<Integer> resultSuccess = Future(() -> 9 / 3); // The Future will at some point contain: Success(3)
* Future<Integer> resultFailure = Future(() -> 9 / 0); // The Future will at some point contain: Failure(ArithmeticException)
*
*
*
*
* @param
* The type for the Future
* @param function
* The function to render either the value T or raise an exception.
* @return The future that will hold the result provided by the function
* @since 1.3
* @see Future#apply(ThrowableFunction0)
*/
public static Future Future(ThrowableFunction0 function) {
return Future.apply(function);
}
/**
* Allows for easy creation of asynchronous computations that will be executed in the future.
* The method relay the execution to {@link Future#apply(ThrowableFunction0)}.
* Best used in conjunction with statically importing this method.
*
*
*
*
* import static javascalautils.concurrent.FutureCompanion.Future;
*
* Future<Integer> resultSuccess = Future(() -> 9 / 3, someExecutor); // The Future will at some point contain: Success(3)
* Future<Integer> resultFailure = Future(() -> 9 / 0, someExecutor); // The Future will at some point contain: Failure(ArithmeticException)
*
*
*
*
* @param
* The type for the Future
* @param function
* The function to render either the value T or raise an exception.
* @param executor
* The executor to use to compute/execute the Future holding the provided function
* @return The future that will hold the result provided by the function
* @since 1.4
* @see Future#apply(ThrowableFunction0, Executor)
*/
public static Future Future(ThrowableFunction0 function, Executor executor) {
return Future.apply(function, executor);
}
}