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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:
  ?8 s1 o) Y; I
! y  c# s% H: G3 r6 }+ u* O3 ~ public Object buildActions () {( P6 Z7 z- C& w! K* G) }8 A  ?
    super.buildActions();  k2 I4 l' z9 k6 K2 S) j4 ?2 F, T
    : _" f8 \, [4 z
    // Create the list of simulation actions. We put these in
0 T8 }! V$ K* a9 d    // an action group, because we want these actions to be
3 q5 ~; o5 u; V, M    // executed in a specific order, but these steps should( n) C1 F3 |0 g" v9 P
    // take no (simulated) time. The M(foo) means "The message
! ^1 c$ x/ y* X% ^- l$ f9 S9 g$ y( g    // called <foo>". You can send a message To a particular2 m2 M% s6 B0 C  d8 _! k
    // object, or ForEach object in a collection.
1 ~. M1 {# E; w        
/ n! `. a9 R# h" [    // Note we update the heatspace in two phases: first run
" a1 c4 Q3 ]' }7 ^: e; e9 N1 Y    // diffusion, then run "updateWorld" to actually enact the
  i, F0 ]9 d: `/ Y    // changes the heatbugs have made. The ordering here is  _: `* Z. l4 T7 S
    // significant!+ \) {& p8 ], u" E, s- n  Q2 H2 A
        
. Z1 Z0 a, B* C! y    // Note also, that with the additional
. x4 U" E) S! E" N3 p  t    // `randomizeHeatbugUpdateOrder' Boolean flag we can
) a! u( E1 H* w" `, j% u    // randomize the order in which the bugs actually run% o4 W2 Y- m4 K! O1 P1 {
    // their step rule.  This has the effect of removing any, {& l, q  Y# X3 v; Z1 V5 H
    // systematic bias in the iteration throught the heatbug
/ h; t8 q: C2 A5 @2 ^    // list from timestep to timestep9 |& y% A2 G" p% G* Y" }- s
        
2 r- i& L* `! d; E) d: g    // By default, all `createActionForEach' modelActions have
5 p! z5 S) Q: q4 J- n0 C* G    // a default order of `Sequential', which means that the
( z$ c5 ?& {' m    // order of iteration through the `heatbugList' will be
+ Z2 I8 w: N1 F. d6 R. Q    // identical (assuming the list order is not changed
& F+ M+ G7 U& m9 I& U2 a5 C/ s& R    // indirectly by some other process).
1 L7 X6 ?5 t, }: O! K! b   
# T# p1 H" t$ X# j' }& G0 @6 [    modelActions = new ActionGroupImpl (getZone ());: P2 k  `3 D; g& |3 Y& y/ n0 a

. w0 }( D3 ~. D4 j  w    try {% v* M, n  N1 ?8 Q. U
      modelActions.createActionTo$message
5 z- r4 _$ D6 u        (heat, new Selector (heat.getClass (), "stepRule", false));6 M1 v0 k0 J1 V6 u1 J( A
    } catch (Exception e) {7 ?& M5 O9 M6 c3 N% H& D, z
      System.err.println ("Exception stepRule: " + e.getMessage ());! y# |( [, X' F. _  v) o
    }
$ R- q* O6 k+ j7 t: r, @' s8 m9 }! f+ z, G7 p* F
    try {
% s0 i( {5 p6 d# d( ^3 m4 l" y0 N      Heatbug proto = (Heatbug) heatbugList.get (0);
& A* V/ r6 ?+ i5 {9 k  U) F3 ]8 G      Selector sel =
$ ]* X* \2 G" T, _        new Selector (proto.getClass (), "heatbugStep", false);
8 k! h) B& O! {& N2 w      actionForEach =4 o% R( R% R' G- O9 n
        modelActions.createFActionForEachHomogeneous$call
6 a. S: p, x0 ^* a. y0 w( ~        (heatbugList,' H2 l: G, t  Y0 D
         new FCallImpl (this, proto, sel," G0 Y" ?2 b- f; U3 K4 h
                        new FArgumentsImpl (this, sel)));
: H2 \4 X) e, O& W& L# ?. \    } catch (Exception e) {
; k/ ]. `- P6 K& G3 e      e.printStackTrace (System.err);
% k& h) p! a2 u4 Y. {4 p    }
8 i7 }5 C; I: @    6 _( a  L0 Y8 l3 ^# d
    syncUpdateOrder ();
$ X8 _( O- ?' ~: g5 D5 g2 _, [4 @- ?% P, F4 [! f/ I4 }1 d5 i$ W' y
    try {
3 `1 X  R  i; O( P& c( V      modelActions.createActionTo$message
$ a5 u2 r8 }' Z' |        (heat, new Selector (heat.getClass (), "updateLattice", false));  R/ a, B( p. z; z/ I
    } catch (Exception e) {0 p' _# V: |) \! y4 D! E, ~
      System.err.println("Exception updateLattice: " + e.getMessage ());
2 T% Y- p' ^, v1 L    }# W9 v- T1 [* i) a7 {. u) z) F, j
        7 u# i! v+ g# e* B
    // Then we create a schedule that executes the
( U' H% r& u( y. k- {    // modelActions. modelActions is an ActionGroup, by itself it- }! E# y& k' A9 I$ c* S
    // has no notion of time. In order to have it executed in* a* X5 g% V' u0 c) r6 p
    // time, we create a Schedule that says to use the' m: X$ d# d" U9 m2 v
    // modelActions ActionGroup at particular times.  This% u1 x6 k: E/ z  E* n
    // schedule has a repeat interval of 1, it will loop every
: A7 ~4 [: f+ f* G0 R- U8 u; Z    // time step.  The action is executed at time 0 relative to
. L' s6 ?; L2 D6 U$ `) X4 N+ F: P. ?; D    // the beginning of the loop.8 V* K5 P1 q# P% M

! l8 R/ W  W7 m    // This is a simple schedule, with only one action that is
- p; i9 p. x7 U6 s+ \    // just repeated every time. See jmousetrap for more
/ O. V+ u, [1 v    // complicated schedules.
+ r0 ^" o/ U. l" T8 n  
, K2 l* u5 A" |$ w( {    modelSchedule = new ScheduleImpl (getZone (), 1);
0 `: P$ X  H: h7 O    modelSchedule.at$createAction (0, modelActions);
3 M' t. @% X% @* p+ @3 v        : W6 X! J: P1 J2 s
    return this;
: ~  H# m3 J' o2 l# j  }
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