bgsynchronizer.pro

Visual Prolog 7.1的一些学习资料,希望对您有用

/*****************************************************************************

                        Copyright (c) Prolog Development Center A/S

******************************************************************************/

implement bgSynchronizer
    open core

    constants
        className = "background/bgSynchronizer".
        classVersion = "$JustDate: 2007-04-20 $$Revision: 2 $".

    constants
        backgroundEvent : integer = 111111.

    class facts
        dontGC : (runnable Runnable).

    clauses
        tryHandleEvent(vpiDomains::e_User(backgroundEvent, Data)) :-
            Runnable = uncheckedConvert(core::runnable, Data),
            retractAll(dontGC(Runnable)),
            !,
            Runnable(),
            succeed().

    clauses
        postRunnable(Runnable) :-
            AppWin = applicationWindow::get(),
            Persistent = bgJobSupport::makeRunnablePersistent(Runnable),
            assert(dontGC(Persistent)),
            Data = uncheckedConvert(integer, Persistent),
            AppWin:postUserEvent(backgroundEvent,Data).

    clauses
        postResult(Result) :-
            postRunnable(Result:result).

    clauses
        write(...) :-
            postResult(bgmsg::newWrite(...)).

    clauses
        writef(F, ...) :-
            postResult(bgmsg::newWritef(F, ...)).

    clauses
        startJob(Job) = bgJobSupport::startJob(Job).

    clauses
        classInfo(className, classVersion).
end implement bgSynchronizer