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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:6 }7 W1 S( b1 m7 D- J. D
( n7 P. C3 `7 x1 U8 v% \8 J
public Object buildActions () {
5 Y$ o. B5 X8 `" Q' f    super.buildActions();( \( @/ Z/ }9 G) J# L
   
8 S9 t3 _9 ^" m2 U( p* X* v    // Create the list of simulation actions. We put these in
+ U! o; O. f) G4 G  D' \    // an action group, because we want these actions to be
% h: H5 D. y/ o    // executed in a specific order, but these steps should
2 `. F' e: d. I7 x& W, M    // take no (simulated) time. The M(foo) means "The message! i1 B+ }6 z) E
    // called <foo>". You can send a message To a particular
( A* s; S% B7 R7 B& ?    // object, or ForEach object in a collection.
: a/ t1 H* A9 C. H        - B. f% `, E: x
    // Note we update the heatspace in two phases: first run$ z- @" q. q+ m, v( r$ N2 B
    // diffusion, then run "updateWorld" to actually enact the
  u$ s1 h6 s- `: g$ ?* ?1 n: M# t    // changes the heatbugs have made. The ordering here is* W# y( A9 a7 N* o% Y- ^
    // significant!( U) d$ S, w8 a
        8 j) {3 u* }3 y9 a; K  k
    // Note also, that with the additional
- B8 l" [  k4 C! N3 g0 ?* d! M, c    // `randomizeHeatbugUpdateOrder' Boolean flag we can
! W3 e, K' x# R1 r! D    // randomize the order in which the bugs actually run' A' ]% E0 B0 K& e; @  {
    // their step rule.  This has the effect of removing any" ^" ^  G" L3 P* j& i5 A6 T! q
    // systematic bias in the iteration throught the heatbug
( s& c9 H$ h$ p5 M0 O* h2 c" o, _2 B    // list from timestep to timestep
# Q; c- a/ r: o! A) c0 K        4 M7 d" V, z9 D* ?& J
    // By default, all `createActionForEach' modelActions have
1 f* g& W7 E  E1 B6 s$ ^/ B* \! ?5 X    // a default order of `Sequential', which means that the  c  g" N# e; W; a  a* _
    // order of iteration through the `heatbugList' will be
  ?$ t% R* S2 b2 p3 f    // identical (assuming the list order is not changed
; S" D4 \3 o6 e  B  f/ m: }) b    // indirectly by some other process).
! R" Z+ v+ p) d; [6 m% `   
+ q! O1 {, l; N! v    modelActions = new ActionGroupImpl (getZone ());# ^% [3 Q" X7 ^$ z. P1 L4 M

, P& p1 G, O( ]" b( L    try {
. L/ g- ?5 m% k* x+ c6 Y      modelActions.createActionTo$message
5 Y8 e! `% E& o- l$ }/ o0 W        (heat, new Selector (heat.getClass (), "stepRule", false));9 ?( p( w3 b7 |! _) Z
    } catch (Exception e) {7 B  u7 V  @$ q& V; t" n
      System.err.println ("Exception stepRule: " + e.getMessage ());$ r1 m  h6 A( U% A9 ?7 D# ~* `5 K" f
    }
) y$ z8 K7 Y  }* G( c7 @2 f6 q$ [3 ~% `  B+ T' e" w
    try {  a: [8 g% \7 x, ~- A. D" Y* z6 x3 v. a! E/ s
      Heatbug proto = (Heatbug) heatbugList.get (0);
) W5 L+ J( Q# B9 O; q. q  y& h9 t      Selector sel =
# @4 Q7 O1 R; P/ n5 K        new Selector (proto.getClass (), "heatbugStep", false);
: r. G  k" S+ I# F& ]. Q/ [5 q) }      actionForEach =  O3 F9 J( A$ j
        modelActions.createFActionForEachHomogeneous$call
+ `2 ]  P. ]$ Q% \# n6 M        (heatbugList,8 b( O# C3 m1 p% N1 r% o" `% h
         new FCallImpl (this, proto, sel,' t. z8 s. p$ m: O) ]2 g6 r
                        new FArgumentsImpl (this, sel)));4 X# t  L6 S1 L
    } catch (Exception e) {' W1 q2 E+ E, r+ R- X$ `
      e.printStackTrace (System.err);
2 c2 D. D! }) y& l    }. Z, |  O" c2 T" v. l8 q9 I
   
4 g, {6 D6 u* C8 n( h    syncUpdateOrder ();
1 u' s. x* c$ Q1 T7 j) T/ ~% U7 L  g
    try {
" s. h- x$ O$ G      modelActions.createActionTo$message 7 {. t3 }4 y: X  s/ j1 @
        (heat, new Selector (heat.getClass (), "updateLattice", false));
- x7 M. i: C; z# c$ I    } catch (Exception e) {
7 e! m8 g, P1 V      System.err.println("Exception updateLattice: " + e.getMessage ());
. b' L" w1 d/ h, {9 ^2 I    }
3 v8 @  [7 `' a  B) q          A6 M. a+ I# C7 m3 t: U% l
    // Then we create a schedule that executes the
9 u' s# h  |1 E7 x. c! P% M1 o    // modelActions. modelActions is an ActionGroup, by itself it8 g$ S3 j4 e- n7 k- F
    // has no notion of time. In order to have it executed in" K3 A# a# l1 O+ ]8 T6 Z" x* V
    // time, we create a Schedule that says to use the
9 _# `; j! s0 m* Z    // modelActions ActionGroup at particular times.  This
5 T4 D5 I" J/ Z    // schedule has a repeat interval of 1, it will loop every" g1 @. e. C" m% }1 e/ h4 Y$ A
    // time step.  The action is executed at time 0 relative to
0 j+ W, y# H8 _4 d: Z3 _+ w    // the beginning of the loop.
$ _+ \" [7 R4 a, b# O
( @/ j  u% s- U/ i% F  u  G    // This is a simple schedule, with only one action that is
, ]7 u1 r9 A" J+ ^4 h, y    // just repeated every time. See jmousetrap for more
- M/ g, V' D# c& L: s    // complicated schedules.& Y# u% A+ \$ \- b" i0 k
  
( y% g9 l3 g8 n0 _$ q    modelSchedule = new ScheduleImpl (getZone (), 1);
: c- T- R: p& ~5 Q3 c5 c    modelSchedule.at$createAction (0, modelActions);2 W7 K3 g, A$ ]( t) N1 `1 J0 @
        : U& I& {" p5 F0 ?7 h3 v  c3 m
    return this;' l8 }: i* W5 \' k
  }
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