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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:. L$ _. I+ s& f& e
  t$ {1 Y2 D# B/ b4 A- }
public Object buildActions () {
8 i' M( t: S- `. A/ Z; v+ i; k- D    super.buildActions();
+ z$ \2 {5 W. R, J6 w    - |; ], B9 P2 ~  o0 `1 C* c& x- {
    // Create the list of simulation actions. We put these in
2 v8 r* q; t3 }7 X7 p% _, C    // an action group, because we want these actions to be* }6 u  B9 T3 |& v3 z. k9 Q
    // executed in a specific order, but these steps should
' t0 r% j* Y& ~2 E- f. a    // take no (simulated) time. The M(foo) means "The message
+ M/ \6 ^6 ?2 L  p2 O, P. `2 X/ r    // called <foo>". You can send a message To a particular
5 Y8 z+ w0 Z) s$ g; S% j, Y  f* n. V    // object, or ForEach object in a collection.1 _1 X+ h7 q' \
        
) S' s4 L7 n% P7 t$ S9 A; u    // Note we update the heatspace in two phases: first run
1 ~' G" n# w% K/ x    // diffusion, then run "updateWorld" to actually enact the. i& w  h- Q3 u( ^: C
    // changes the heatbugs have made. The ordering here is' T- z  k" m: S
    // significant!! C: s$ U7 ~0 p; j6 W
        
% Q1 e$ K7 l9 O' S6 L; `    // Note also, that with the additional/ @, ^; c; L4 i0 W- x9 D6 }
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
: t- T# Q( |3 u% y    // randomize the order in which the bugs actually run( P) D! q; I  a9 W! d
    // their step rule.  This has the effect of removing any- A' l( N( K  E3 Q) ^
    // systematic bias in the iteration throught the heatbug
+ W% j" H8 _% I* y% G' G    // list from timestep to timestep
2 @' i) S3 @+ ^- r3 |        
$ ]2 F% w8 e* b/ |0 G$ v1 T' b. m    // By default, all `createActionForEach' modelActions have
: W0 P+ X6 J6 b( N& `% v' D    // a default order of `Sequential', which means that the' a9 m; I  q- v8 d" A* w  _
    // order of iteration through the `heatbugList' will be! i; B! q# x9 t) s; Q  X2 o
    // identical (assuming the list order is not changed
! ]9 [; _9 z9 R! z* F+ n    // indirectly by some other process).
+ R; l" P6 {. v    ( z, u! J" x8 t- v7 v" j
    modelActions = new ActionGroupImpl (getZone ());
4 z/ [" d# w8 X4 j8 K+ w: n2 e; z% X% Z  R; f  E# U+ @# Z" F5 H
    try {( B) C! U7 c, b: ?  ^, N  m
      modelActions.createActionTo$message
* N, m" P1 U7 V2 J2 W        (heat, new Selector (heat.getClass (), "stepRule", false));
2 j- k: B' o+ B5 j7 U    } catch (Exception e) {3 B& x+ X8 `% G& G4 i2 `
      System.err.println ("Exception stepRule: " + e.getMessage ());8 ~6 S) |7 d7 l1 L
    }
# O3 [5 |% @9 E. {" i/ E- N; p4 I. d; T9 n8 N6 y
    try {. B8 q  E1 `6 E% g
      Heatbug proto = (Heatbug) heatbugList.get (0);" I3 R2 f- m8 ]2 O$ u
      Selector sel = " n* J  ~8 q$ i# i$ K/ n" C
        new Selector (proto.getClass (), "heatbugStep", false);+ b+ T. f4 [. O$ }, i" W
      actionForEach =9 \9 h& Z5 p' [# d/ d* u
        modelActions.createFActionForEachHomogeneous$call
' e; A, w& @1 }        (heatbugList,) G1 I8 T0 P2 M& l
         new FCallImpl (this, proto, sel,0 H& h( @' g% x6 Q% y
                        new FArgumentsImpl (this, sel)));& ~9 C4 C5 e1 k6 I
    } catch (Exception e) {8 `7 A2 h* n8 n7 T! F
      e.printStackTrace (System.err);
/ E% h9 B. \4 C6 m9 S    }
& m2 U% E4 Z+ v" r! e+ t   
6 x$ I6 V8 m+ }# s: |1 k5 h    syncUpdateOrder ();
6 E- l. J% n! R& C8 c: g$ x/ n8 |" r+ t2 k3 ~6 n' Z
    try {. E7 T" h: q, e2 h
      modelActions.createActionTo$message
5 |5 i  \) Q, h$ @0 x7 D% f        (heat, new Selector (heat.getClass (), "updateLattice", false));
  c- d8 {. N7 R5 a    } catch (Exception e) {, k$ G; L5 l% h3 `) E$ f
      System.err.println("Exception updateLattice: " + e.getMessage ());
  u/ l3 J! ]# x/ V  l) t    }
) j+ Z$ k" D! [  v" J0 k        
; Y1 V: U; i. c) v2 {    // Then we create a schedule that executes the3 ]7 P# y6 }1 ~! @/ a1 e: s) S. s
    // modelActions. modelActions is an ActionGroup, by itself it
! \$ F; \1 ~' \# [8 J. ?    // has no notion of time. In order to have it executed in
! C! Z( i5 M2 X0 x6 A! v8 J9 n: R    // time, we create a Schedule that says to use the$ t6 A2 p* m4 o+ O) Z4 [1 a
    // modelActions ActionGroup at particular times.  This5 N9 G9 j- O, G* T7 v
    // schedule has a repeat interval of 1, it will loop every: t% z+ x# q/ [8 K% G  S. C- _4 @+ U
    // time step.  The action is executed at time 0 relative to
, V% E4 e' ]" {& P    // the beginning of the loop.% ]- {' y* o& I8 \' s9 q1 V

! }7 ?1 R5 g2 \% ^2 `    // This is a simple schedule, with only one action that is% \! p* I1 E, \* U7 R$ _+ @
    // just repeated every time. See jmousetrap for more! ?2 c( s; {! w* y6 _( i
    // complicated schedules.
7 [' ?9 U% D4 T# s/ w3 z  2 q5 g" W" h- L  G  v2 E
    modelSchedule = new ScheduleImpl (getZone (), 1);& X/ \7 x( P( R( @. d
    modelSchedule.at$createAction (0, modelActions);, K: K  ^1 M& \5 Z2 Q2 Q& |
        0 ]; _# `- c& }* P
    return this;4 a" B0 Y( i+ P6 {+ ?8 U# ~' a
  }
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