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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 k, Z' r2 m5 \
7 ]% U9 X6 b8 ? public Object buildActions () {% C5 ?9 z8 G+ b' g! g0 [% @
    super.buildActions();- K! Z. u# ]3 E, A
   
* ]. u/ N: E+ i+ @    // Create the list of simulation actions. We put these in3 j% e* }, w) j5 l# I, ^% y
    // an action group, because we want these actions to be5 _4 Z( J+ D6 E. V1 u  C$ ?
    // executed in a specific order, but these steps should
& E  w2 N2 n8 l3 y/ |$ G    // take no (simulated) time. The M(foo) means "The message" ]: _2 `; [* _4 L* B$ U, a# Z
    // called <foo>". You can send a message To a particular
* D  M0 Q0 d6 u; h    // object, or ForEach object in a collection.
" A# O$ q' T, j. v( n& ]! D          b! A' Y4 E3 `
    // Note we update the heatspace in two phases: first run: H( s. B! J9 I+ ]- N- ^: Q
    // diffusion, then run "updateWorld" to actually enact the
& v7 F" ~, r# y    // changes the heatbugs have made. The ordering here is
2 b; x) O" p! v# l    // significant!4 _5 b4 M4 Y' c
        , x$ W7 y* w$ Y1 g/ m3 m/ a2 s
    // Note also, that with the additional8 W/ r' P" p. X5 R5 \
    // `randomizeHeatbugUpdateOrder' Boolean flag we can, o# ]! Z0 }- R  |
    // randomize the order in which the bugs actually run# W! z4 M+ S+ m  J* `
    // their step rule.  This has the effect of removing any8 R  f/ o: _$ r1 }7 ]8 @' ?. m
    // systematic bias in the iteration throught the heatbug  L5 q1 [+ o& U: X- _( n, |. m
    // list from timestep to timestep) Z  w4 p8 t9 o# K
        
8 p+ X" n3 l" `    // By default, all `createActionForEach' modelActions have
# H! u" I" I0 Y    // a default order of `Sequential', which means that the
) l  f8 f/ s  p  j5 p7 R    // order of iteration through the `heatbugList' will be
# b5 u1 p  U+ z6 E: W/ l, y" t    // identical (assuming the list order is not changed
3 Q+ X  i& Y5 D) l  K  Y; ~    // indirectly by some other process).
, ]# ~6 [+ R  \- x, Y) Y- R7 {   
# m4 U0 G$ I' s- `+ F    modelActions = new ActionGroupImpl (getZone ());
; t+ U# E# v* e8 O
$ Z0 ]3 U: ~! i6 D5 k    try {
9 j  c( p8 L+ r8 \4 g( b: ^3 x      modelActions.createActionTo$message
- H" x* m, d9 U6 t$ E        (heat, new Selector (heat.getClass (), "stepRule", false));
$ r: E, C0 N/ a4 s    } catch (Exception e) {) m) }- P! L, {, I
      System.err.println ("Exception stepRule: " + e.getMessage ());4 g9 ]  ~) b8 D' T  ]
    }
: d! E0 B; f9 {1 _- O. N3 X2 f6 E
# ^7 w* j9 p; b+ N' s6 }    try {
* P; k6 i. H$ Q      Heatbug proto = (Heatbug) heatbugList.get (0);8 B) [* c7 v% l
      Selector sel =
/ |9 j. U6 h$ E% H8 n! ~3 u! d- B        new Selector (proto.getClass (), "heatbugStep", false);3 f" x% M9 s* [8 G) Z2 _
      actionForEach =
2 x/ x4 E+ E1 v6 w$ y. @- E        modelActions.createFActionForEachHomogeneous$call
0 f( e: u* O# l, y        (heatbugList,
5 w8 S+ m* o" w7 |$ ^* k         new FCallImpl (this, proto, sel,
* I( O% p: Z( ?$ |  S1 U+ {3 O4 L3 K                        new FArgumentsImpl (this, sel)));& J5 s7 r; c! G9 l' x' F! ^* [
    } catch (Exception e) {; l7 ]- l0 f' o
      e.printStackTrace (System.err);
3 Z7 q' ^3 p" l    }
: I, I" q7 f, S1 Z/ ~    1 T8 _8 p% o7 m" K/ M; X. g0 ~  S
    syncUpdateOrder ();
% _2 w9 C% h0 b% ^
! t+ o1 K, ]$ {) a( L6 I. W1 {    try {3 w+ I: Y# O" [
      modelActions.createActionTo$message : F' Y" ?& c1 h. X# Z( t
        (heat, new Selector (heat.getClass (), "updateLattice", false));# |9 z. p* b$ f; `; F$ g  X
    } catch (Exception e) {; r7 E6 V& d* D
      System.err.println("Exception updateLattice: " + e.getMessage ());/ n, n* @: z- l
    }
; B; M8 f+ H+ C9 p        
- M7 g3 F9 t+ [! P& A& n5 ^    // Then we create a schedule that executes the( u# s4 {. U( M# W: o- b# r/ V8 s
    // modelActions. modelActions is an ActionGroup, by itself it
4 L; C" [& A' w7 ~    // has no notion of time. In order to have it executed in
4 \- k- G$ j, v2 ]( P    // time, we create a Schedule that says to use the
) V( L" ]! _" z  G9 R    // modelActions ActionGroup at particular times.  This( R1 r& R1 C) J; u# F. ?2 |+ s! ^
    // schedule has a repeat interval of 1, it will loop every
: z8 V, e0 {2 N5 Y9 I1 C9 C    // time step.  The action is executed at time 0 relative to
5 L% A# V' c+ p$ j4 s% e2 n& {( f    // the beginning of the loop.
- g2 D* _7 j9 D
6 G% O% b1 H5 s1 T! M* b  h    // This is a simple schedule, with only one action that is, d, j+ Y; K( R, A2 G" s
    // just repeated every time. See jmousetrap for more& O6 ?$ t4 }0 f
    // complicated schedules.
$ V7 h0 w- r* O5 ], q  
7 N* P  B4 ^( _6 ~, [    modelSchedule = new ScheduleImpl (getZone (), 1);" I) I! X6 v! J" L+ S
    modelSchedule.at$createAction (0, modelActions);
! z6 d0 a; ^, n4 H( g        
% Z+ |! A  k$ b+ K0 z    return this;
2 z/ x0 S  J  u  }
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