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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:: i* i4 g  ^) ~; y4 t/ r

( _' D* d: |# M: q public Object buildActions () {  u+ `# E+ Y6 M' u
    super.buildActions();3 Z* e4 p6 }* g5 z
   
2 T- e* B  @# @- A2 ~+ L    // Create the list of simulation actions. We put these in
" I. Z7 k0 Q  d; N    // an action group, because we want these actions to be( i$ S/ Q7 U' {9 N: o! W
    // executed in a specific order, but these steps should
" k3 g6 t* p" z0 {9 @" B, N4 z    // take no (simulated) time. The M(foo) means "The message
; b3 M, e9 M% w  ~+ X- V3 H. u    // called <foo>". You can send a message To a particular: L0 n5 e0 ~& f0 Z, z0 _% T7 b/ C) [
    // object, or ForEach object in a collection.3 R3 H. a2 y# K) B( ?
        , p- w* b/ t2 I2 O
    // Note we update the heatspace in two phases: first run
7 J* A$ t' ^7 y8 }. e    // diffusion, then run "updateWorld" to actually enact the
9 Y  Z( F: f2 x    // changes the heatbugs have made. The ordering here is
3 i  z% C. [$ g5 T! C. t    // significant!4 u1 u$ s' c/ W0 B/ f3 x% z
        
2 y9 e) G! d' k9 E* w+ ~1 s0 ^/ M    // Note also, that with the additional  A' t* V( G3 I( u
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
+ c! l. K! K5 J    // randomize the order in which the bugs actually run
: o( x; [/ p5 g8 j+ G) h    // their step rule.  This has the effect of removing any
3 X7 O1 m# E1 z7 o" L0 n    // systematic bias in the iteration throught the heatbug: P$ v5 U7 N; B* f& D
    // list from timestep to timestep6 i* h7 ^9 c) f, p( j
        
' |9 T! N* D5 T' \0 A    // By default, all `createActionForEach' modelActions have
' T" b. L# ^7 |% X    // a default order of `Sequential', which means that the% K; j0 G  J  S+ j
    // order of iteration through the `heatbugList' will be4 i! U8 @6 g& [( t0 c$ E  C5 C& L
    // identical (assuming the list order is not changed; p0 e5 P9 j! Q" ^
    // indirectly by some other process).
/ L% q! i/ R( c7 K; e$ {    6 A0 K: O1 J" ^8 i" m2 F
    modelActions = new ActionGroupImpl (getZone ());
: p* p/ B+ r: ?7 x0 b8 X; Z) v' Y. }  w: J$ E8 U! @
    try {
% ?9 e* l# u; }& d: S1 o3 o      modelActions.createActionTo$message
, P1 A9 L2 Q8 l9 _        (heat, new Selector (heat.getClass (), "stepRule", false));
; X. i' ?& w8 O# K6 Q2 w    } catch (Exception e) {
; {# E3 g' F6 ?      System.err.println ("Exception stepRule: " + e.getMessage ());
2 O7 d# Z- L3 k& @5 Q    }6 p: B6 g8 e0 ?- v

9 X3 S  R5 S4 ]. d# V# h    try {
$ T" F. t; |9 J5 v4 [      Heatbug proto = (Heatbug) heatbugList.get (0);3 y5 G, C7 N8 p" [0 Q( p1 ~
      Selector sel =
& X+ u1 L$ B' K/ j. B        new Selector (proto.getClass (), "heatbugStep", false);) b/ ?) [; o! m" M1 K. O6 N. P0 ?
      actionForEach =9 t0 \8 ^7 s7 O$ h
        modelActions.createFActionForEachHomogeneous$call! z6 o, L! x% Y! u, K
        (heatbugList,1 d5 N( s; |% D% f# B: U) j, y
         new FCallImpl (this, proto, sel,8 Z9 o' v- [" g( a
                        new FArgumentsImpl (this, sel)));
" R4 \/ `6 d4 G2 |' h    } catch (Exception e) {
! ?# @! a! y5 V- }$ w      e.printStackTrace (System.err);. P! t0 I) M% Y1 c6 b# W3 q+ b$ l( [
    }
  J( k4 s7 W8 \    ; j, B) j/ |# `5 K' j
    syncUpdateOrder ();
! j8 N0 O8 Q: [  R
5 C6 S- G: G2 |/ l4 |, z, @4 O    try {
, `' u! o& v# c3 t      modelActions.createActionTo$message
) t5 }; `; W3 T        (heat, new Selector (heat.getClass (), "updateLattice", false));3 n1 z7 t  u! x
    } catch (Exception e) {
! n8 e2 ^9 I4 `. Y* m3 r      System.err.println("Exception updateLattice: " + e.getMessage ());
! P, i5 E2 T; \3 @5 p    }
9 t, i" F! U8 ~& h4 @4 L        
* b: {5 @" d# f; B7 Y* A    // Then we create a schedule that executes the
* |* e$ n* b" Z8 q: v  H: Z    // modelActions. modelActions is an ActionGroup, by itself it
9 G+ ^6 S9 t1 F+ w# i( p5 ]% ]8 J    // has no notion of time. In order to have it executed in8 x- b% r. L: l% f$ |
    // time, we create a Schedule that says to use the/ P1 L& q1 ?5 F5 _0 [+ M
    // modelActions ActionGroup at particular times.  This5 b; k9 ?. q2 q: v
    // schedule has a repeat interval of 1, it will loop every6 q. L4 P& U5 c, u# {
    // time step.  The action is executed at time 0 relative to* s# X) e$ G; K9 E/ S
    // the beginning of the loop.8 O/ l- S! W& A! E, ?
, H0 U8 l4 N" T% r) C% {
    // This is a simple schedule, with only one action that is
) T9 h; x0 e+ d+ Q. r# j' O    // just repeated every time. See jmousetrap for more* F% ~: S& H' Y
    // complicated schedules.
1 s; s9 W% ?+ N! v/ E0 z7 t  0 i: K& g# a: l5 N
    modelSchedule = new ScheduleImpl (getZone (), 1);
! K  f0 E& Q# {( p8 a# ?$ ^    modelSchedule.at$createAction (0, modelActions);' D0 f- p2 Z$ i1 I' @; X% G
        ( ?& K+ t1 C2 U5 Q- }9 z$ n4 a
    return this;# T# a& z- m4 W7 y' H
  }
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