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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:% g) m+ w# ]: Q" W; ~
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public Object buildActions () {0 c* }, x. D3 S2 h6 Z* F, O" j% E
    super.buildActions();7 L0 z. c/ c) o$ t/ g, s8 ]1 b
    0 F% i1 z9 I6 E6 K: m
    // Create the list of simulation actions. We put these in8 {7 I3 G- Y3 O4 C' t8 _
    // an action group, because we want these actions to be
, g  @; x. O) \    // executed in a specific order, but these steps should
4 G7 e/ q2 S& M$ I    // take no (simulated) time. The M(foo) means "The message; C; r+ A! G8 k& j$ P: N; O) U
    // called <foo>". You can send a message To a particular  {) \1 J5 b* D/ ]
    // object, or ForEach object in a collection.
9 M( V7 z  O- n% {: N  j        
' B4 o( M  |! z3 R# e$ Y    // Note we update the heatspace in two phases: first run3 R8 d+ V, C5 x/ M3 ^
    // diffusion, then run "updateWorld" to actually enact the
6 o  R' N& v) ~" D- [; U5 U: m5 @    // changes the heatbugs have made. The ordering here is% ]$ K5 I* B' Y
    // significant!
, H/ L( p  X" j" w        
: z: J6 A. h; \$ F: ~) U    // Note also, that with the additional+ T, N6 M# k( |& I& I/ H
    // `randomizeHeatbugUpdateOrder' Boolean flag we can- Y: h: e1 ]8 W! A  _0 F
    // randomize the order in which the bugs actually run" T9 K9 e# m3 D: M4 Y' O7 J5 ^
    // their step rule.  This has the effect of removing any
" H- S$ d+ ^9 E1 ?2 i    // systematic bias in the iteration throught the heatbug
! L! C6 H; N& _- ?6 S$ E/ n    // list from timestep to timestep1 w5 h/ Q8 R: j/ K9 c% U& ]
        
% v0 l& q: E) _2 [+ `3 c    // By default, all `createActionForEach' modelActions have! G- }1 Q" T1 Q  _
    // a default order of `Sequential', which means that the
0 v) k* P" L& x. q& g6 S, Q& l    // order of iteration through the `heatbugList' will be
& t. O, N" H) c9 I( x    // identical (assuming the list order is not changed
0 U" z! E# t7 H+ d) N    // indirectly by some other process).# J6 a: o) [; h% I" a  ~, V
    " a% E5 R# P" z
    modelActions = new ActionGroupImpl (getZone ());$ B) k% n5 u$ h0 }

: a6 o( [1 e: Y3 K7 D1 x    try {, A9 I5 o$ f- @, C
      modelActions.createActionTo$message5 j1 x* B4 w5 y. [
        (heat, new Selector (heat.getClass (), "stepRule", false));/ ^  K4 ?$ w1 ]& M% N' [$ o; H
    } catch (Exception e) {! F7 o/ V  b, T/ A# |
      System.err.println ("Exception stepRule: " + e.getMessage ());
5 ?# v1 Y4 D9 Q. l    }. U; N7 J* b+ s4 x
  w: u  ~, J6 g2 N; ]$ E( W5 v
    try {6 o" W+ v% F% V+ ?$ }
      Heatbug proto = (Heatbug) heatbugList.get (0);, D: q0 a/ ~0 A3 N4 W% H1 M
      Selector sel = $ d/ u: F, [' @( t  {
        new Selector (proto.getClass (), "heatbugStep", false);; T! v9 q3 `/ g7 y  P. t) q
      actionForEach =
6 @3 J) m# M/ C$ ^. Y        modelActions.createFActionForEachHomogeneous$call8 C# I. W0 q! X! r% r" E
        (heatbugList,
% N  J6 Z/ F8 F- _' N! A         new FCallImpl (this, proto, sel,7 P$ A  R  I, C: o
                        new FArgumentsImpl (this, sel)));: V6 Y3 I/ c0 G
    } catch (Exception e) {
# c6 `2 Y+ T8 f1 N3 H" z) c/ v$ g      e.printStackTrace (System.err);
+ N: ~+ Z7 K1 o8 L/ \    }
3 f( O6 P3 l! i; T& I4 i& [    ( f9 ]8 g. B0 I/ f+ ?. U
    syncUpdateOrder ();
3 @1 e9 R1 S  [+ k  a. a
, a9 H6 H: T7 C    try {
# F) `' P! \' q5 s8 l" U  I      modelActions.createActionTo$message
6 A7 f2 O$ O  \        (heat, new Selector (heat.getClass (), "updateLattice", false));" H) a& c( H% Q2 m' U  G) \" z2 B+ U
    } catch (Exception e) {
! B% V, R6 u! O6 O' U; K      System.err.println("Exception updateLattice: " + e.getMessage ());
# l" A" B& l% {    }
# x' a# e/ k0 E( @/ r4 f% w        
* A: x  a. E6 B; x- l! a    // Then we create a schedule that executes the' a5 q' V' h* M4 U
    // modelActions. modelActions is an ActionGroup, by itself it
3 @! E! i: _% E; V8 ]    // has no notion of time. In order to have it executed in
$ E2 _! S; Q4 G# P# a    // time, we create a Schedule that says to use the
5 F1 X4 n1 }7 p" D    // modelActions ActionGroup at particular times.  This
5 e7 r9 b8 s0 y/ ]2 \" H) Y/ L+ v    // schedule has a repeat interval of 1, it will loop every
$ G0 ]" q* D# l    // time step.  The action is executed at time 0 relative to/ e% D# ~! M; _6 Q8 J7 n) j+ m7 h- e
    // the beginning of the loop.
; i* x$ _+ X4 L6 a" F
. p& c4 n* @% S    // This is a simple schedule, with only one action that is
5 J( a$ v9 g% M    // just repeated every time. See jmousetrap for more
& M" r. f+ N! ^: y5 B# w$ y; y$ o    // complicated schedules.
7 Z! J* S0 Y# b* B" L  
; Z/ K% G1 \% _, X/ m    modelSchedule = new ScheduleImpl (getZone (), 1);
! {) z5 n  b& Z/ h    modelSchedule.at$createAction (0, modelActions);/ n2 g! G& e7 L$ Z! r2 Q& d0 t' S. E
        
# P& M3 C) \2 d! e  G) ^  V    return this;/ U" t3 K+ \! w
  }
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