Re: Using "abstract" on a class with no abstract method

"Mike Schilling" <>
Sun, 16 Aug 2009 13:35:54 -0700
Stefan Ram wrote:

Daniel Pitts <> writes:

how about replacing your command structure with method calls:

 I think this idea illustrates the meaning of

 However, my idea is to have a program that can be changed
 at runtime. That is, components can be added or removed
 from the program as plug-ins at run-time.

 Say, the clock component issues a call to the text console
 component. In your notation, this is:

textConsole.println( "clock ready." )

 However, the user might not have added any text console
 component to his program instance. So this can not work.

 Instead, the clock component uses:

container.process( new PrintConsoleCommand( "clock ready." ));

 Now, if the container happens to be a text console itself,
 it will print the text. Otherwise, the text will be
 forewarded in such a manner that it will reach all text
 console components, if any is present in the program at
 all at this moment, otherwise, the message will eventually
 be ignored.

 I also do not like to have a single communication manager,
 because I want local interaction of components. That is,
 each component interacts directly only with its container
 and its containees.

Is there a master list of commands, or are they added by optional
components as well?

If the former, you could assign each command a numeric value, and
eliminate instanceof by changing command processing to a switch
statement. Even if the latter, you could assign each compnent a
unique namespace and assign numbers within the component. Command
processing becomes

    if (cmd.getNamespace.eq("http:://")
            case CLOCK_SET:

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