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[求助] 问jheatbugs-2001-03-28中某些代码

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发表于 2008-5-25 02:15:22 | 显示全部楼层 |阅读模式
5仿真币
HeatbugModelSwarm中buildActions部分,3个try分别是做什么?查了下refbook-java-2.2,解释太简略,还是不懂,高手指点,谢谢!代码如下:, T2 N2 m6 ?8 e9 ~7 \* ]  u1 C
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public Object buildActions () {
. R. x% o% k9 v. o3 G    super.buildActions();8 I. }9 J! y0 o8 e! F" T
    $ m  a0 z! q( n3 [
    // Create the list of simulation actions. We put these in+ _% Y" g) R2 |! S" o0 G/ ~
    // an action group, because we want these actions to be
8 x9 ^7 h, n/ H0 ?' y; X/ Y# f) p    // executed in a specific order, but these steps should
2 f( U! R# Z4 V7 f: a    // take no (simulated) time. The M(foo) means "The message8 i  b& ~! {# ^2 W% P. v4 R
    // called <foo>". You can send a message To a particular
1 P$ K) ^5 D" l$ R    // object, or ForEach object in a collection.. s9 d1 P1 d( t0 n$ c
        5 l0 F% K4 x; z" s5 _
    // Note we update the heatspace in two phases: first run3 r& ~; I" C. @
    // diffusion, then run "updateWorld" to actually enact the
- J0 r: ?3 a  a7 m# w* r8 `3 l9 z    // changes the heatbugs have made. The ordering here is
0 @- z4 J0 ~0 k) J    // significant!# a$ d6 F& s' B0 _9 H
        
% @1 Q1 k& i( x# A7 e4 `$ L) f" Y/ v. `    // Note also, that with the additional0 G: x% a" W$ H
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
! K  v( @- p# v# t    // randomize the order in which the bugs actually run
- w9 S1 M% `1 M+ L& g/ h  E! f    // their step rule.  This has the effect of removing any
0 I. m6 f, ?, x5 J4 O; W    // systematic bias in the iteration throught the heatbug- V! _, n. d% l9 ^8 u, f
    // list from timestep to timestep" e% |) K" r# W3 a5 v
        
( S4 z: R7 A! V: b" M: d8 C    // By default, all `createActionForEach' modelActions have5 w5 h3 F* ?2 q1 v7 d* Q# k
    // a default order of `Sequential', which means that the
$ ?7 o% `/ K- m* i    // order of iteration through the `heatbugList' will be+ }. l6 K& M2 p0 q8 s
    // identical (assuming the list order is not changed
0 g7 j; y9 x0 w& p4 b, G8 E4 ^! L    // indirectly by some other process).
8 n5 E3 d8 q+ I3 v   
& r1 t/ f# O6 H# {    modelActions = new ActionGroupImpl (getZone ());
) _# v, f1 b% i/ r1 f
" F  g; W1 _; B6 r; S, J+ h- n    try {
4 C4 B4 Q+ ^, s- N: L) ]4 S0 T      modelActions.createActionTo$message7 e# s' m3 |+ a
        (heat, new Selector (heat.getClass (), "stepRule", false));
+ ?* K7 o% W' j3 W; w: q    } catch (Exception e) {
( k: d& s, O% e3 H: E      System.err.println ("Exception stepRule: " + e.getMessage ());! l5 u; }8 b' O2 t7 b
    }
+ |1 T7 ?- _! I+ {: Q* J. \& {5 }3 R' D% Q* w
    try {
! B% {0 [3 t; r3 j: H: d! R      Heatbug proto = (Heatbug) heatbugList.get (0);% b* Q6 k! h8 N, _  ?- \
      Selector sel = 5 {9 U; w+ i" @. k+ M% `
        new Selector (proto.getClass (), "heatbugStep", false);; A" x# ]# x) H
      actionForEach =! y" t+ Y) T7 a! N$ y/ \/ g
        modelActions.createFActionForEachHomogeneous$call  j0 z- E4 D$ T5 D
        (heatbugList,; z* _# t9 v3 v5 S8 K
         new FCallImpl (this, proto, sel,
4 A0 w; g1 e8 b9 F7 g1 C                        new FArgumentsImpl (this, sel)));0 h; i. Y( {8 B/ e
    } catch (Exception e) {
; j! D5 _) s9 t7 X$ E2 f      e.printStackTrace (System.err);  k* B8 M! Y! V! T9 f) L
    }
0 d- J1 K- l: q( ]. I3 a   
1 M8 Q; E1 n' y7 ^' V* n: S& r$ F    syncUpdateOrder ();
. X1 ?5 L9 D- p/ _+ R4 \
2 [! Z3 R1 S* r7 W& u    try {
8 a' H: J8 E3 u      modelActions.createActionTo$message
' m9 D1 @% h+ n7 m        (heat, new Selector (heat.getClass (), "updateLattice", false));1 O" d7 u# ]  R, e' ?# C6 n- A% p
    } catch (Exception e) {
7 k8 x8 f, d' Z7 }9 ~5 T# A2 i; c      System.err.println("Exception updateLattice: " + e.getMessage ());
& ^6 U0 e' U* |4 W, P; x    }
; _; {6 L0 g. a( B* t        4 m) ?8 h) R0 m% X$ ~
    // Then we create a schedule that executes the/ g; J4 z. Z* g( f8 T9 ^) P2 T
    // modelActions. modelActions is an ActionGroup, by itself it
. }! f4 T2 Z4 h4 j$ R0 B    // has no notion of time. In order to have it executed in! E, r# p) Q4 H9 F) ?
    // time, we create a Schedule that says to use the: I0 o& G. ^4 @% S: k
    // modelActions ActionGroup at particular times.  This
: p+ E4 j$ P, P0 S2 O: R+ I    // schedule has a repeat interval of 1, it will loop every0 ?2 x# h3 L1 c% d. U$ y  H
    // time step.  The action is executed at time 0 relative to
" g% U% q; w9 v$ O9 Y. J+ W( W    // the beginning of the loop.$ D. X7 A5 v4 ]& T
3 |7 i7 v# F! D8 f+ F
    // This is a simple schedule, with only one action that is
( f6 m  u% \4 s% d; Q9 X    // just repeated every time. See jmousetrap for more' g1 ~& v. O0 R" H- E( V8 _
    // complicated schedules.
9 Z" y6 I5 V/ c* t* E  ( P4 Y* W0 |4 I/ v5 M
    modelSchedule = new ScheduleImpl (getZone (), 1);
. j9 z  L( n( w1 p3 g* x: `% C    modelSchedule.at$createAction (0, modelActions);$ @3 J" P' A" G- ~2 U! p
        
1 W. }) q4 h( [# Y9 a" ]    return this;
; @# i: B/ l: Y1 b, [- E* ?  }
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