What design pattern does Java Executor framework implements?

Question

My understanding is that it seems very similar to Abstract Factory.

Note:

The executor interface:

public interface Executor {
     public void execute();
}

And then there is an Executors class containing static factories for various Executor implementations.

Tucket

One thing to note though a factory is mostly concerned with creation , while the Executor interface defines a method that is mostly concerned with execution of tasks. – Tucket

Answer 1

It's not Abstract Factory. It is Mediator pattern coupled with Command pattern.

Executor interface is command pattern. Implementing execute() is obeying a Command.

According to GoF, Mediator pattern intent is:

Allows loose coupling by encapsulating the way disparate sets of objects interact and communicate with each other. Allows for the actions of each object set to vary independently of one another.

Mediator Pattern in JDK

java.util.Timer class scheduleXXX() methods

java.util.concurrent.Executor class execute() method.

java.lang.reflect.Method class invoke() method

Have a look source article for more details.

Submicroscopic

The Command pattern is exhibited by the Runnable which is executed, rather than the Executor itself. – Yoho

Thanks for the link. But its more command pattern than mediator isn't it? not really sure what behavior/component is following mediator design pattern, can you help explain? – Tucket

Have a look at :github.com/mryndzionek/java_mediator to understand in better way – Submicroscopic