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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:3 z* |; G/ o  P7 s9 f
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public Object buildActions () {
1 s$ O5 ~. Z8 g3 H6 Y    super.buildActions();9 _. t+ F. v% O. {
   
& ]! f) H: R: I    // Create the list of simulation actions. We put these in
; S$ \4 \0 z+ R+ U& {% r    // an action group, because we want these actions to be3 p& {$ I3 w2 h4 i1 M; i
    // executed in a specific order, but these steps should
; o' w" C- u# \0 H. x0 v4 _, Y' Q    // take no (simulated) time. The M(foo) means "The message
. J# a& C. h: E* M0 Q7 G& P5 A3 ^    // called <foo>". You can send a message To a particular
5 T& e6 _* n  d, i  a    // object, or ForEach object in a collection., ~( ?" G: ]. r) b) t
        
* X- S9 e% P' [1 D2 y( _  M    // Note we update the heatspace in two phases: first run- A9 X" E3 \' K3 `# l- L* ?" d
    // diffusion, then run "updateWorld" to actually enact the& N& ]; J& |1 J$ E6 a
    // changes the heatbugs have made. The ordering here is
1 t# [9 O# Y+ l2 E0 x0 W  D' R  k    // significant!
  V; X3 H( \9 H, x- W. v        4 [6 f! ~! Q5 V* |+ v: [' |% U
    // Note also, that with the additional3 ^5 _  D; I% s. d- y
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
# V7 A; O, U5 U# N& {% d    // randomize the order in which the bugs actually run0 L5 c% l, H1 m
    // their step rule.  This has the effect of removing any  T! _  d  T7 f
    // systematic bias in the iteration throught the heatbug
/ I, w3 a2 K5 S8 Z  m5 h/ p1 A7 z    // list from timestep to timestep
) c! G' {/ Q% X7 s1 P* o8 e        
* l, M) g6 g9 |. M+ C: r! _! f2 D    // By default, all `createActionForEach' modelActions have
; [  |2 @0 S0 L, E    // a default order of `Sequential', which means that the
1 v- Z( D* X# f8 P    // order of iteration through the `heatbugList' will be
. b! z6 e8 b2 T6 G# b' I) [    // identical (assuming the list order is not changed
4 R. A' b1 D9 _) L5 e$ ~    // indirectly by some other process).
6 l* ~* l, M; A    / Q" p) X3 X5 K' l, s  q# }7 t
    modelActions = new ActionGroupImpl (getZone ());# x- U% @9 H3 |7 d6 m( ?8 D
3 e  ~* _; f0 X; _+ ]
    try {. Z# S3 U; F8 b: M+ y
      modelActions.createActionTo$message' R/ U, B1 D& X6 \
        (heat, new Selector (heat.getClass (), "stepRule", false));
: B3 F! H* I% B+ t    } catch (Exception e) {
& M7 W3 A8 _2 a      System.err.println ("Exception stepRule: " + e.getMessage ());- D' `- u1 H4 H2 C  h3 @
    }, Q- e8 u% _( V0 v/ y
" L1 H" s. X  R) b! K
    try {
" ]" G# X  ?: s' |: B" F: B/ h      Heatbug proto = (Heatbug) heatbugList.get (0);! }; g& i) j0 q6 T1 m$ E; H( b
      Selector sel =
$ q2 a) A7 R/ {  \. V        new Selector (proto.getClass (), "heatbugStep", false);
! ^# q$ [; }1 h5 [      actionForEach =  |+ U: n& U3 X: R4 A0 p
        modelActions.createFActionForEachHomogeneous$call
0 t* n/ N' ^  i8 i; K6 h        (heatbugList,, v# B- z0 a- U* g  x! `
         new FCallImpl (this, proto, sel,
% f; M2 R* p% c) P6 X                        new FArgumentsImpl (this, sel)));% S. u) R" K* t6 d' F3 b
    } catch (Exception e) {3 a5 V  X; d  L' p5 Q7 L" A* e/ d
      e.printStackTrace (System.err);. c( \, E, V8 j3 x5 z
    }/ a5 Z3 k) y  d/ C$ Y7 ?- j; M
    : }3 [7 R7 \. m0 \9 `5 E
    syncUpdateOrder ();
* j( N! ]5 t9 Z' ?8 h7 G
7 L3 r, G3 y/ D% D7 |+ D6 o    try {' e7 j1 d+ x1 T* Y. f' s$ |
      modelActions.createActionTo$message
  X1 A" P7 y) j+ D9 ]        (heat, new Selector (heat.getClass (), "updateLattice", false));
* X2 X- J; v" M! r  @1 q    } catch (Exception e) {
+ S8 h$ w8 [/ r! D! e5 ^2 g* D      System.err.println("Exception updateLattice: " + e.getMessage ());( l5 B, }. t: B' }9 _! g
    }5 F1 a! U& P' N, G* o
        
  u4 F1 \4 @6 }9 {5 V! J& u    // Then we create a schedule that executes the
5 v8 c, A9 s5 q2 h$ l    // modelActions. modelActions is an ActionGroup, by itself it
  Z, _7 L+ ]7 z    // has no notion of time. In order to have it executed in
4 C$ |$ k* J6 R/ l" t1 S# g  b3 G    // time, we create a Schedule that says to use the  n, k, c- B8 X- W# K: Z4 z
    // modelActions ActionGroup at particular times.  This
$ i9 n: K: N; C    // schedule has a repeat interval of 1, it will loop every7 J7 H% Z$ G6 u8 J8 i
    // time step.  The action is executed at time 0 relative to- K# ^0 Y2 H. E* I: }
    // the beginning of the loop.- U1 E  A. z/ ], G2 v  l) h+ \5 a3 B% S
& }) F3 x, h* _9 Y1 |! W
    // This is a simple schedule, with only one action that is! c7 o, v; p) q( V2 q
    // just repeated every time. See jmousetrap for more
/ E( i0 Z; s3 I$ i9 A    // complicated schedules.; A( R' u0 v; i; Q" Z
  3 u" |; U1 `4 Y) T
    modelSchedule = new ScheduleImpl (getZone (), 1);, C) [' K. @: l% p9 {4 |5 M
    modelSchedule.at$createAction (0, modelActions);6 v1 d; K6 h$ i2 _1 N8 J; Z  F3 D
        
0 @6 ^& }: R/ I6 O4 A. P, ]! g    return this;
& p  w5 N2 m% s6 ~5 d/ P1 ^5 L  y  }
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