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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:
" a; y9 \5 O3 R/ V* Q5 c
" a5 \. c- A; F! v9 z& D public Object buildActions () {
; R' a, ?2 o& S, U8 y- ]    super.buildActions();- b% G9 Q! u' Q
   
8 f0 _8 s8 d. B1 X1 i; ^# R2 j    // Create the list of simulation actions. We put these in9 y) d4 F# x/ m: x2 ^7 b
    // an action group, because we want these actions to be
' r- ]8 l/ T2 ^6 T1 q$ B    // executed in a specific order, but these steps should* A: A3 n, h1 U: V( \
    // take no (simulated) time. The M(foo) means "The message
* `2 {6 {1 V+ }    // called <foo>". You can send a message To a particular5 p/ E. t! }0 E' ~7 j9 a
    // object, or ForEach object in a collection., a6 l8 n8 ]9 s! q* \; G" a$ \1 ~9 A
        " z% S/ ^0 Y1 _5 }
    // Note we update the heatspace in two phases: first run
3 ?7 T( _8 z6 M8 I! p    // diffusion, then run "updateWorld" to actually enact the
1 \0 {; Q( e' v" C5 j    // changes the heatbugs have made. The ordering here is
; @$ }' ~& p1 B+ d) g    // significant!5 B3 i" _' [7 ?" L( A& f  d6 w
        
' u0 W( j# ~3 h9 F  U    // Note also, that with the additional* m. E1 Z- E% C
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
- q, C  m9 d, k0 t    // randomize the order in which the bugs actually run: k2 n% a6 F. T3 a, N3 G) t# C
    // their step rule.  This has the effect of removing any
8 C& o  J0 }$ S6 [* p    // systematic bias in the iteration throught the heatbug
; E3 s$ m# V+ T    // list from timestep to timestep! y! ~7 I* _: q* B' h! E) F& ~+ S
        
, J' y9 S: E3 v6 z    // By default, all `createActionForEach' modelActions have7 H  w/ o- Y4 w+ u7 y, t
    // a default order of `Sequential', which means that the
* }" D) H* v. p, ^8 H0 \' e4 ~6 X    // order of iteration through the `heatbugList' will be' m4 D, e  C- Z' m
    // identical (assuming the list order is not changed
/ E0 x5 r" a& D3 P+ L    // indirectly by some other process)., y* Q( t; r5 O1 z
    0 K% M' n0 b7 S: J2 j5 s. u
    modelActions = new ActionGroupImpl (getZone ());
! G' ~: p4 _* j0 j( {, M, `9 F. y5 [( d, T/ q& `# f" ]
    try {7 c# R4 a$ L1 J5 C6 ]
      modelActions.createActionTo$message
1 B, z* @" m- x        (heat, new Selector (heat.getClass (), "stepRule", false));
! R& S. s( y6 T1 ?    } catch (Exception e) {
9 a6 A& K1 f% D4 h1 I/ N      System.err.println ("Exception stepRule: " + e.getMessage ());4 y: ], j; K: o0 f
    }1 @+ T* k2 k5 T! X# d# c
7 O0 ~: e, I4 c9 O! T
    try {
, t& |- Q/ _2 p# x      Heatbug proto = (Heatbug) heatbugList.get (0);) T3 ]4 b% O, \% i( M- w, C3 ]
      Selector sel =
) B9 `! w1 A4 a5 A" K        new Selector (proto.getClass (), "heatbugStep", false);+ G  R5 [5 A! {$ Y: m% n" \
      actionForEach =
, N+ g/ L3 A, S8 n        modelActions.createFActionForEachHomogeneous$call
1 S  L. S0 t( X" g" K1 {        (heatbugList,
1 r5 f( s* i  e: T4 K) D         new FCallImpl (this, proto, sel,
6 Y& E/ v! F! T7 D. m' M                        new FArgumentsImpl (this, sel)));
% _$ W- v' c6 a  q5 B: B    } catch (Exception e) {! F. o) k& f7 b1 J0 j: [
      e.printStackTrace (System.err);
! ?" E" s( s0 V* Q8 |    }' C3 z) H. S- W" r) s* f  y
   
+ Q+ |- l4 b2 u' T" `    syncUpdateOrder ();+ W6 {' U, b  a! S2 h( g
" D$ i5 L* r/ D, E8 j) \, A; V
    try {' o8 C' [: F5 p( P# Z0 t+ ^# l
      modelActions.createActionTo$message $ j: M( v4 ~8 z9 V4 a2 E
        (heat, new Selector (heat.getClass (), "updateLattice", false));
( C7 m1 N) b$ z( ^  ~5 G& o    } catch (Exception e) {
  F, n2 H0 H* I3 Y, h      System.err.println("Exception updateLattice: " + e.getMessage ());" B1 [8 g7 U/ N& i4 m
    }/ a8 t, T* `" @; f1 x
        
4 g. A) Q3 w+ I! v: P, L! E" g2 ^    // Then we create a schedule that executes the* F- K  @& M) q
    // modelActions. modelActions is an ActionGroup, by itself it
7 f. O6 F. U1 \+ y    // has no notion of time. In order to have it executed in" s2 ^7 O' G# e. c. ?- A
    // time, we create a Schedule that says to use the
& C4 {& r, \* Q9 ~+ `    // modelActions ActionGroup at particular times.  This
: B4 X0 h: B  h" G    // schedule has a repeat interval of 1, it will loop every
5 {4 M4 j0 r$ R) z( k    // time step.  The action is executed at time 0 relative to$ y) J$ k, M0 U% Q
    // the beginning of the loop.
& p& H/ ^9 C' |' F5 u' ^
1 K' }  T6 Y) k- C, s    // This is a simple schedule, with only one action that is
/ L! W- |  G8 G; N5 b" B. D; ^    // just repeated every time. See jmousetrap for more( O6 J( f4 j4 `, p4 T9 X* w
    // complicated schedules.2 T2 g- ^; f; g6 R9 _
  
* Y6 k. C# \  d6 w    modelSchedule = new ScheduleImpl (getZone (), 1);+ R. N/ Z. J" \5 [8 D1 a2 X$ ~7 O% |4 a: O
    modelSchedule.at$createAction (0, modelActions);) I5 `7 B8 s( d8 `& ~2 Y  W
        ; R& V/ C5 C# `' w0 X9 L! L6 b0 T
    return this;3 _- t" F* e) l4 \) A% j8 I7 `
  }
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