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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:: M0 ^- J5 B; [
% x. }7 ]  m; p! m
public Object buildActions () {
; R3 i: m& A1 A$ {. H    super.buildActions();* ^9 U7 N! r; V: h* [8 m
    0 Y1 A$ ^: g7 d9 L6 i: X: h
    // Create the list of simulation actions. We put these in
* L/ q8 T/ m, B) B8 w    // an action group, because we want these actions to be7 M. O- \( a! l# C- R2 F9 n- g
    // executed in a specific order, but these steps should
& X' j1 x! o* s9 Z. P    // take no (simulated) time. The M(foo) means "The message
8 A6 d# k- Q; t    // called <foo>". You can send a message To a particular3 N  N% O9 b" t: G' W% }
    // object, or ForEach object in a collection.
1 B) f' U5 s) M  l! A9 T. C2 `) O        
( p  o( c% I, I* Q' n2 a0 M; q6 i: F    // Note we update the heatspace in two phases: first run
, R: L* D$ H; t: t    // diffusion, then run "updateWorld" to actually enact the# V3 j7 Q% _* j7 T
    // changes the heatbugs have made. The ordering here is; m- s4 e" F2 j- R! ?1 W4 s
    // significant!
; J* V1 V/ [! Z! b2 e! L        % P" R; \' w6 V; [( O# A
    // Note also, that with the additional
" I9 u! Y! ]$ a- V/ J    // `randomizeHeatbugUpdateOrder' Boolean flag we can  {# T  H2 u: \( [3 n5 M
    // randomize the order in which the bugs actually run
5 G* K( d0 \# r! g  {8 D- G' S    // their step rule.  This has the effect of removing any: Y- Y- y, G( t' t/ |% Z
    // systematic bias in the iteration throught the heatbug) O( e# P% _" v; R1 G
    // list from timestep to timestep
, k' o& h9 ]) h% l) P8 p" h        ( N2 R1 Y. d" f9 z* S" T, L
    // By default, all `createActionForEach' modelActions have9 F, Y' }# ]* }
    // a default order of `Sequential', which means that the+ D4 X7 I8 N9 W  e, C
    // order of iteration through the `heatbugList' will be
+ F$ t$ k' Q0 L$ u    // identical (assuming the list order is not changed
: ], D- T3 y7 U2 m    // indirectly by some other process).
$ _9 s# T: ^! _, P. }* ?( Z    & }) [* P  G1 N, h
    modelActions = new ActionGroupImpl (getZone ());% v9 U# Q0 J& _0 I
4 q! y' m+ J6 Q" l3 n. p
    try {4 U+ V+ x9 J3 K0 G5 S6 h
      modelActions.createActionTo$message
2 E* z( u6 I) P0 S# i        (heat, new Selector (heat.getClass (), "stepRule", false));9 [; F" K1 Y. b0 R; W$ N; z
    } catch (Exception e) {
5 ]8 X0 K8 r+ \# u4 T( [      System.err.println ("Exception stepRule: " + e.getMessage ());
, S( U" z5 D0 X; }' n6 a  d$ z# j. L    }, }  }( Z& b. f% j; f- X6 z

( n( x; }9 `* i2 F8 V6 d    try {
1 [6 u' O1 Z% S, X0 O      Heatbug proto = (Heatbug) heatbugList.get (0);  f$ S5 G1 x; j- i; l3 m7 s
      Selector sel =
3 O! J: p! M9 }4 o        new Selector (proto.getClass (), "heatbugStep", false);
/ e+ |2 }: ?3 z3 `( f& Y* y# t      actionForEach =/ b0 ?; L, `! U, d( I% ^$ a7 C5 c
        modelActions.createFActionForEachHomogeneous$call
3 Q- G0 u- n* R& x2 g1 _        (heatbugList,) T8 i$ |/ x9 g$ V
         new FCallImpl (this, proto, sel,
1 Y% r% a/ s: n3 a1 P  K/ B7 u  }8 J                        new FArgumentsImpl (this, sel)));
/ [. g1 D" f6 X" _. e: @    } catch (Exception e) {8 C) a9 b" r! w9 d
      e.printStackTrace (System.err);% m- \; p$ y+ Y2 B
    }6 `* S2 e/ k. z/ \
   
7 f) l* p/ Z$ g2 a9 r. O$ {* H' I) ?    syncUpdateOrder ();" L2 O7 H0 E' O$ \& @8 A2 o

1 S+ l* g* Q  w8 y# n    try {
/ x& Y& {2 x0 s- V$ f      modelActions.createActionTo$message
5 S# O' s3 @" ?. F" d% k        (heat, new Selector (heat.getClass (), "updateLattice", false));
6 R0 S8 D' u1 j    } catch (Exception e) {
1 ^; d: k+ L# ?0 m# o5 H      System.err.println("Exception updateLattice: " + e.getMessage ());# ?$ G$ I4 B; N; m; {2 U
    }
6 v& ]. R8 _/ P3 ^3 Q* O2 D" b        
5 T( K6 ^# a+ `( e8 o    // Then we create a schedule that executes the. c  ^5 n3 g9 u8 H
    // modelActions. modelActions is an ActionGroup, by itself it: l" C9 O' ^! U2 j6 J& G; b2 H
    // has no notion of time. In order to have it executed in
- K1 a& X/ o/ [# R( z# R    // time, we create a Schedule that says to use the' J! C4 b" b  `* g1 t
    // modelActions ActionGroup at particular times.  This
7 l% e' N8 D5 q2 }    // schedule has a repeat interval of 1, it will loop every! v  `. l) w: K
    // time step.  The action is executed at time 0 relative to5 o' s; N5 Q$ L: n9 u
    // the beginning of the loop.6 W; [+ u9 ~0 s% g! \0 g7 }, Q

' X- s* s" d; A    // This is a simple schedule, with only one action that is
; ]+ l9 C) C0 Q8 c/ C    // just repeated every time. See jmousetrap for more& Q6 E) T7 s1 i+ j9 d8 |2 F
    // complicated schedules.
" _$ [( L) @0 G! r0 M' u; M8 J7 t. c  ! s/ j# _- ], {, W/ W/ Q
    modelSchedule = new ScheduleImpl (getZone (), 1);% J9 @5 X/ W7 Z# i9 @- n& s  u3 T
    modelSchedule.at$createAction (0, modelActions);7 p0 s- d# n* D# W6 n$ ^
          L! M  c5 ]5 Q$ ^' S
    return this;
2 ~+ _  i, G! t  }
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