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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$ e( O0 ~# T
* _# G! u* J+ n- R) o, X public Object buildActions () {6 j1 m' G+ ], \
    super.buildActions();
9 w8 Z, x( N# q5 Q- [; e" f! J   
3 v  Q4 o6 |1 V$ P! a    // Create the list of simulation actions. We put these in+ Y) Q, g" V4 {+ L* K
    // an action group, because we want these actions to be  M* l5 ^" x, G: x& B8 g- ?* C
    // executed in a specific order, but these steps should" o, ?, B9 ^' C9 q- G
    // take no (simulated) time. The M(foo) means "The message
7 o- o( Q  C' [    // called <foo>". You can send a message To a particular
) t, R7 g( L$ p. s    // object, or ForEach object in a collection.1 k: |- x% L, s. U
        2 s# Q) W; O* O, T
    // Note we update the heatspace in two phases: first run
$ t6 i( C+ @4 W3 k    // diffusion, then run "updateWorld" to actually enact the
' j! w( Y/ x$ m; _2 |    // changes the heatbugs have made. The ordering here is
9 d" t+ C! K- V    // significant!  W9 _* O2 ~3 i
        % S& Y& O0 _' {' |, Q4 K
    // Note also, that with the additional
; N) d* U: ^! k" o4 E: n4 k. R    // `randomizeHeatbugUpdateOrder' Boolean flag we can
- z4 E* ]1 l/ K1 Z. |    // randomize the order in which the bugs actually run
' f, E) J% Z, _1 \0 Z! u0 L    // their step rule.  This has the effect of removing any
) A* C. A2 a& u9 f- R  g& `4 J    // systematic bias in the iteration throught the heatbug
# [8 J' a7 e  S. C% e' \7 Y    // list from timestep to timestep
  g# N2 u% {+ `5 P2 r        
( f" y1 l8 c' F. j" j/ @' \    // By default, all `createActionForEach' modelActions have
8 N6 M7 \& V8 R! R7 `    // a default order of `Sequential', which means that the. ~7 P5 S& `; M7 X5 d7 p$ s2 n
    // order of iteration through the `heatbugList' will be
1 b5 V, B  L/ o    // identical (assuming the list order is not changed6 N& k+ ^. ]" P0 U9 s. r. L
    // indirectly by some other process).
$ X7 s  }$ I. R( R9 k    5 y6 j  @: P0 {. `; p9 k! k
    modelActions = new ActionGroupImpl (getZone ());. \% ~( D" M( n2 `" w, c- K8 }
/ b7 j5 A9 w" g: S7 v( u- \* [
    try {
" h( _' a* W  {- g$ c& i/ U      modelActions.createActionTo$message5 T' E% G' r0 m0 v6 X2 W
        (heat, new Selector (heat.getClass (), "stepRule", false));: `  D* e8 z$ O
    } catch (Exception e) {' l+ j; t7 G2 Z: U9 C: i: j
      System.err.println ("Exception stepRule: " + e.getMessage ());/ A) B3 |/ \8 M3 G0 ^0 ~5 i, K8 H
    }( {: C! V1 w; T* [" a
! Y7 Q2 d- j" Q$ T/ n
    try {. Y) i/ }( a0 b8 _# r
      Heatbug proto = (Heatbug) heatbugList.get (0);
/ w/ @: N! b- r6 H; {& Z( J8 G      Selector sel =
$ i$ c+ O4 i2 L7 y1 M3 G        new Selector (proto.getClass (), "heatbugStep", false);
3 l" `  y, Z  B3 ]3 C, Z      actionForEach =. R0 E7 C5 f/ H2 `) ^; H- G0 x
        modelActions.createFActionForEachHomogeneous$call
9 O5 j$ n, {8 P) [( m; \# t6 Q5 |        (heatbugList,/ a: U+ h: P! q. S
         new FCallImpl (this, proto, sel,. n! T; U% N$ f7 d+ E& l
                        new FArgumentsImpl (this, sel)));8 W) X5 {6 y: g) h; S3 {
    } catch (Exception e) {
2 r- @, o6 D& a      e.printStackTrace (System.err);
4 w- x: R1 m" S1 l+ S9 }& k    }
0 j& M' b9 \; N" ?* n% i5 m    * O1 W& Q3 h' W1 k1 u0 ^- z
    syncUpdateOrder ();. x/ J& w' o$ Y1 E7 \* ?

& C% W# O+ u/ _) V! }2 m    try {6 `9 L5 r0 P$ Q4 D
      modelActions.createActionTo$message
6 x( `' S4 z) n; u- {        (heat, new Selector (heat.getClass (), "updateLattice", false));/ G0 d& u; E1 V+ ~5 O7 |6 Q; X7 o
    } catch (Exception e) {
/ W. G7 |- T, V4 ~4 A      System.err.println("Exception updateLattice: " + e.getMessage ());
% \# e- G- C6 ~8 F    }
) V: X! h1 a3 Z# H) g5 z5 |! U        & C) T! g' |. b" S' V* [
    // Then we create a schedule that executes the
" s1 b. b/ X( L' H    // modelActions. modelActions is an ActionGroup, by itself it
5 M  ?5 J  X: f, i% O/ F. `! Q    // has no notion of time. In order to have it executed in# a! F, L' q8 e9 n1 h; d
    // time, we create a Schedule that says to use the
' Y% `4 [7 b1 D3 L    // modelActions ActionGroup at particular times.  This
: q2 A" Q8 |* U  T9 i6 b    // schedule has a repeat interval of 1, it will loop every
5 D; d/ |* e# k3 J) @) K    // time step.  The action is executed at time 0 relative to
" X/ G: E" Q3 |+ f    // the beginning of the loop.
6 y; }( t% p  D4 a+ @
) j$ u' i" z/ {, t    // This is a simple schedule, with only one action that is
+ l; p+ U5 }8 c  |5 }2 m    // just repeated every time. See jmousetrap for more9 t$ Y9 I; r, p
    // complicated schedules.
; |7 ?6 ?+ E, `1 n  O3 ^  # h8 x% y/ h  S; g5 ~* [
    modelSchedule = new ScheduleImpl (getZone (), 1);) [+ `; k! K! R7 n$ i& x
    modelSchedule.at$createAction (0, modelActions);
" Y; B7 W' w! n. k. E6 w        
" Y7 N  S: e" c; @0 c    return this;
  d3 Q, d# m& f  R$ S  }
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