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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:
0 v4 q- t8 ]! \8 m# Q4 F% V7 B+ Y3 u9 B
public Object buildActions () {
& P0 W) @# P  k) e) t' L4 @5 d    super.buildActions();
7 Q$ h2 R7 ]4 p2 w: m! e  ~    1 s( p/ a, ?( z# U8 v1 p
    // Create the list of simulation actions. We put these in
. T  ~  f# p: _1 x& f+ M    // an action group, because we want these actions to be
3 b, e3 x' Q6 w- A; ]    // executed in a specific order, but these steps should
1 U3 P- N; {; U) r    // take no (simulated) time. The M(foo) means "The message2 c& h) C" k0 v
    // called <foo>". You can send a message To a particular" Z: W0 V- I: Z
    // object, or ForEach object in a collection.
. i$ n8 e- O, k        . {# C: \2 S- u1 j* u, v& K! m
    // Note we update the heatspace in two phases: first run; G' Q7 Z& i; J7 `, m
    // diffusion, then run "updateWorld" to actually enact the, @; j) V+ t  E7 q8 I: p8 u
    // changes the heatbugs have made. The ordering here is
# y) }- S. ?: P" [) t" n, V- I4 W    // significant!
% [0 K% \- w, S+ G2 C8 H. }5 Q        
* f+ ?$ _9 _# E  i' X) x; u    // Note also, that with the additional
1 [8 Y4 d& l9 |% I" Q# y    // `randomizeHeatbugUpdateOrder' Boolean flag we can3 j- U+ D5 A1 x9 T3 P! b
    // randomize the order in which the bugs actually run
2 t$ K6 o4 W6 G9 J  {) j4 ?8 Y7 j    // their step rule.  This has the effect of removing any
- O, ^( z" }  Q( A* _4 P    // systematic bias in the iteration throught the heatbug6 ~( P% [* f6 z6 U% c
    // list from timestep to timestep3 \6 H5 l( R6 I; a
        * K2 c. Z& h+ o  H
    // By default, all `createActionForEach' modelActions have
5 t* k1 J5 K9 z    // a default order of `Sequential', which means that the
! ~" v5 [- y. n$ k& b    // order of iteration through the `heatbugList' will be$ ], W; X9 K4 H
    // identical (assuming the list order is not changed) N7 v. ^$ {+ f5 z8 I6 ^2 v
    // indirectly by some other process).6 W! `, r6 [( P4 u# w, o
    * C0 @, u  F) s" c) P/ _
    modelActions = new ActionGroupImpl (getZone ());
; L* i/ G9 T9 m( V: ?  _1 {' {4 A
1 S' B( M: I8 O- D3 ]9 L4 I- l    try {% i0 E: i# l; `. ~3 \/ j
      modelActions.createActionTo$message
; a3 W6 U, _0 p        (heat, new Selector (heat.getClass (), "stepRule", false));2 W# N3 k2 s) ?/ r( N- Z5 T
    } catch (Exception e) {
6 \3 i% u' S" W* t" L! q# q      System.err.println ("Exception stepRule: " + e.getMessage ());
# U4 [" v) B/ x' T  L; i, W1 i- }: V    }, h% t7 n# w" e% H9 J
3 N! G0 K! E7 P" s, G
    try {
0 R5 B  E/ n5 e  l9 t' O      Heatbug proto = (Heatbug) heatbugList.get (0);
8 c' x9 o6 Z# [: H% I. ^      Selector sel = . A6 p+ s3 w) ]" w; r* p5 W
        new Selector (proto.getClass (), "heatbugStep", false);
. \5 k7 X  `) k# P7 d- n      actionForEach =
! \3 ?+ P2 n7 c        modelActions.createFActionForEachHomogeneous$call" L& ^- l" T( l+ k. N
        (heatbugList,# z2 l7 l2 c- ^/ V& G) ^4 a* j" O3 {
         new FCallImpl (this, proto, sel,
  n0 T2 T3 F% l/ z  m                        new FArgumentsImpl (this, sel)));& f8 z- k5 h2 f
    } catch (Exception e) {
! v5 Q+ O  f1 j) _      e.printStackTrace (System.err);
$ z5 V) q5 c: ^4 m1 B8 j0 U    }% N# l* y" {3 `- A- [; Q4 d
    5 G: M4 Z( l' N/ O) X1 J
    syncUpdateOrder ();
' k$ U% o( h! o) w
2 M6 W, b' Q- s( ^% ?/ x4 l. ~    try {
: |. D7 L2 i4 n6 E1 k/ s      modelActions.createActionTo$message : M. @# ~2 W& |( q
        (heat, new Selector (heat.getClass (), "updateLattice", false));
8 H% F7 \  ]7 T, j    } catch (Exception e) {) g) R; x) f2 S" [2 p
      System.err.println("Exception updateLattice: " + e.getMessage ());
; v( O) H" ~! F, f1 m    }
$ t6 V: R4 N0 g  W# D  E        
  i" r6 S/ j0 z    // Then we create a schedule that executes the
3 F0 z, u7 g& k) m& @    // modelActions. modelActions is an ActionGroup, by itself it
* i% k( m& g3 X% I7 E    // has no notion of time. In order to have it executed in6 v4 ~7 t" n6 }' r
    // time, we create a Schedule that says to use the5 f6 b% |1 b( g6 E% r4 `( l
    // modelActions ActionGroup at particular times.  This
9 ]5 B3 J1 @- U  F; c    // schedule has a repeat interval of 1, it will loop every
7 n4 J0 |0 d9 X3 s6 c    // time step.  The action is executed at time 0 relative to
8 i" p% i! H6 e! k/ B: e    // the beginning of the loop.
5 \2 z+ r+ {+ a- C* ?7 `- |* q7 r
    // This is a simple schedule, with only one action that is
% {6 x; r9 K0 E0 X/ V    // just repeated every time. See jmousetrap for more
8 H, I, b0 Y8 G0 K1 z; N- [    // complicated schedules.
' m+ q' }* J  P0 q3 z: l  ! d' ~- _3 U1 ?* {
    modelSchedule = new ScheduleImpl (getZone (), 1);, }! v& s- h1 W3 F3 n# Q' P* q
    modelSchedule.at$createAction (0, modelActions);
& x7 c" Q2 g* S0 }8 U2 M        7 m& b- |0 o& C
    return this;
+ `6 y& l; y& W6 a  }
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