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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:( V4 `% ]$ @; a
1 R2 z( l! }6 b; x
public Object buildActions () {
/ t5 f# i# a# U+ }6 ^) Q1 Y    super.buildActions();
$ u3 i. q, @: m0 W7 n    5 T% U5 z  j$ O2 l0 F) j) m
    // Create the list of simulation actions. We put these in
$ S; C3 L* T* _& f6 n, c    // an action group, because we want these actions to be
9 e) i# `+ r, S) A# H( E    // executed in a specific order, but these steps should
3 R  S9 u6 @( }+ i" l) t' u    // take no (simulated) time. The M(foo) means "The message+ L+ W* _! O+ X3 z9 q8 Z6 w
    // called <foo>". You can send a message To a particular7 o! k' h8 K+ d( |0 M0 o: c+ C
    // object, or ForEach object in a collection.
* x  {# |. k/ n" A' u        
& y0 d; P- k: p    // Note we update the heatspace in two phases: first run# v$ n6 F& E/ `$ P
    // diffusion, then run "updateWorld" to actually enact the9 l5 ?/ d0 t5 C) X
    // changes the heatbugs have made. The ordering here is
2 c2 k' b% [6 l    // significant!* q% y% e* p) g0 W
        
8 [# Y0 J) @, A7 d% u3 F' S    // Note also, that with the additional
; E: a& ~. s' N! ^4 e; h9 I' N    // `randomizeHeatbugUpdateOrder' Boolean flag we can, A3 S  g* r* A# ^2 x; V0 N; S
    // randomize the order in which the bugs actually run
, L  s; @8 J6 p# [, Z! H    // their step rule.  This has the effect of removing any
& ]6 J9 B1 z, A1 ]' m  w! S    // systematic bias in the iteration throught the heatbug6 e; T$ W6 P2 S! t) `# N
    // list from timestep to timestep& `% K$ J" R+ B
        
2 F8 s. v" h, B, C& c+ J8 W6 R    // By default, all `createActionForEach' modelActions have
2 ]% \' D# `9 d( M    // a default order of `Sequential', which means that the+ z; q$ u- S2 A$ ^1 \! p
    // order of iteration through the `heatbugList' will be) Y& A* {5 {( m; B: A
    // identical (assuming the list order is not changed
, F2 N5 w* ?- |+ {" j    // indirectly by some other process).
" Q' P4 n( m# }0 x   
$ P' `5 f- ?' M* E# y7 _/ g1 D    modelActions = new ActionGroupImpl (getZone ());5 h2 N$ q# U  H0 m# \" n* X8 X' m

! y' N' ^( C! n2 ?. w2 [1 Y    try {
+ Y  G8 Z5 b" T9 q; z  \3 A* ]      modelActions.createActionTo$message
. s" h& G7 f, @( `        (heat, new Selector (heat.getClass (), "stepRule", false));
+ u; h: v& D  r* U3 P  H* B    } catch (Exception e) {  X5 R% P2 i, ]7 }
      System.err.println ("Exception stepRule: " + e.getMessage ());
) c. x8 y7 R. A/ _. x5 c' L    }1 o3 m( f7 k1 j' K! G7 [

# o* _2 ^3 ^0 @& }+ K    try {
/ l' ~  o! l+ L9 N4 e      Heatbug proto = (Heatbug) heatbugList.get (0);  C: e- E7 g3 Q, a
      Selector sel =
0 A4 D$ B3 m3 i        new Selector (proto.getClass (), "heatbugStep", false);
* r5 B% n: \* L/ O5 s      actionForEach =
1 g  S  H7 e) b: ?        modelActions.createFActionForEachHomogeneous$call7 [. Z* I0 O, q7 @* i, r
        (heatbugList,
9 z* x% Z5 Q" z         new FCallImpl (this, proto, sel,
$ v# p! p( l; O8 i& n7 `                        new FArgumentsImpl (this, sel)));- v: z7 W1 ^; A# e1 L# M
    } catch (Exception e) {7 `( s  V& F- A5 y; e0 P1 ^6 ]
      e.printStackTrace (System.err);  a7 z2 @# B% p# a* _( E
    }8 W* o; j# M  r
    % Y" y2 w: _0 P
    syncUpdateOrder ();
% `6 j0 C" {9 o( O; }. ?4 n0 m6 [5 f2 X& M. {: ]. x
    try {
  n/ f7 L9 @4 r+ [% d* f" H      modelActions.createActionTo$message " _+ {! s/ A0 |6 C: w$ v0 U7 q+ G
        (heat, new Selector (heat.getClass (), "updateLattice", false));" f  s0 R; @' R0 w  y* c
    } catch (Exception e) {8 N+ U0 `& b8 w7 S# U3 N* l; |
      System.err.println("Exception updateLattice: " + e.getMessage ());
) `. K3 Z8 c/ K, a' l    }1 r6 A. e3 h$ P0 N" g3 H: D
        " ?! M' W3 ]: A, P" q, N' ]
    // Then we create a schedule that executes the
! y: |2 l( b5 s6 }- S    // modelActions. modelActions is an ActionGroup, by itself it
0 M/ U6 R& X& k$ o; e5 e8 y    // has no notion of time. In order to have it executed in# D' m- a% P/ H8 N+ u
    // time, we create a Schedule that says to use the. |8 h& @3 m, w
    // modelActions ActionGroup at particular times.  This& e" @9 h: l  H9 m
    // schedule has a repeat interval of 1, it will loop every
# G+ j3 d0 g7 W* V    // time step.  The action is executed at time 0 relative to
9 ^2 G% {6 L' S    // the beginning of the loop.
& K, ^7 V) |: {" V5 v; x9 f9 {% Q( ~* h9 ^  S4 x" Y
    // This is a simple schedule, with only one action that is
+ f. L/ [3 ?& i2 k3 }- _* _9 ^5 o4 g) s    // just repeated every time. See jmousetrap for more+ _% v, Y$ P5 e3 ]$ r. T( e
    // complicated schedules.
! P" `8 T, L* p$ P! ~  
0 v& |7 J3 U% N( ~% K    modelSchedule = new ScheduleImpl (getZone (), 1);( i/ @* R7 Z8 o4 C7 n
    modelSchedule.at$createAction (0, modelActions);! T. u* u8 h. ~9 J$ \& j" f
        
* \8 t) A" t" N! u/ |    return this;
( w! n0 Z. |2 O  }
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