Real world example of application of the command pattern

Question

Command pattern can be used to implement Transactional behavior (and Undo).
But I could not find an example of these by googling. I could only find some trivial examples of a lamp that is switched on or off.
Where can I find a coding example (preferably in Java)of this/these behaviors implemented using the Command Pattern?

Answer 1

public final class Ping implements Callable<Boolean> {

  private final InetAddress peer;

  public Ping(final InetAddress peer) {
    this.peer = peer;
  }

  public Boolean call() {
    /* do the ping */
    ...
  }
}
...
final Future<Boolean> result
    = executorService.submit(new Ping(InetAddress.getByName("google.com")));
System.out.println("google.com is " + (result.get() ? "UP" : "DOWN"));

Answer 2

In one of our projects, we have the following requirement:

1. Create a record in DB.
2. Call a service to update a related record.
3. Call another service to log a ticket.

To perform this in a transactional manner, each operation is implemented as a command with undo operation. At the end of each step, the command is pushed onto a stack. If the operation fails at some step, then we pop the commands from the stack and call undo operation on each of the command popped out. The undo operation of each step is defined in that command implementation to reverse the earlier command.execute().

Hope this helps.

Answer 3

Command Patterns are used in a lot of places.

1. Of course what you see everywhere is a very trivial example of GUI Implementation, switches. It is also used extensively is game development. With this pattern the user can configure his buttons on screen as well.
2. It is used in Networking as well, if a command has to be passed to the other end.
3. When the programmers want to store all the commands executed by the user, e.g. sometimes a game lets you replay the whole level.
4. It is used to implement callbacks.

Here is a site which provides as example of command pattern used for callback. http://www.javaworld.com/article/2077569/core-java/java-tip-68--learn-how-to-implement-the-command-pattern-in-java.html?page=2

5. Here's another link which shows command pattern with database. The code is in C#. http://www.codeproject.com/Articles/154606/Command-Pattern-at-Work-in-a-Database-Application