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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:
" R& P; u# m& ^2 ~
$ {: N0 f6 y' X: s: h0 h public Object buildActions () {$ U* S. T9 D) q/ Y  f, R/ ?& Y
    super.buildActions();/ S5 A' C* o- C& g* v. _8 k$ j/ ~
   
" S3 v0 x+ e$ W' Y( x, r    // Create the list of simulation actions. We put these in! o) i6 N! @: T* T
    // an action group, because we want these actions to be
# w# u- g4 ]/ X    // executed in a specific order, but these steps should8 M+ U+ Z! P; B! F  K) S) l
    // take no (simulated) time. The M(foo) means "The message
) Y' D  x2 G2 m, Y3 C9 l% P7 q    // called <foo>". You can send a message To a particular
9 U, ]8 B# @' h0 _    // object, or ForEach object in a collection.. z* m2 x" g2 g% b, [( i
        
9 u  I1 ]5 q  u4 c  H; x    // Note we update the heatspace in two phases: first run. n# r. ^6 [5 N, e) g
    // diffusion, then run "updateWorld" to actually enact the
% i3 K1 W4 y  |+ ^3 @' d3 |    // changes the heatbugs have made. The ordering here is
% S& j, k6 `  S    // significant!
, S) |! M3 n8 u        # a% u3 G4 j) }: h
    // Note also, that with the additional0 S( B4 u; X# z. ~3 ]8 E. |
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
# z, }. O* C+ E9 F, w* B3 L    // randomize the order in which the bugs actually run2 n; J  s) L  |( p* [$ b  `
    // their step rule.  This has the effect of removing any
$ p2 o2 F3 d! p' |% N0 _0 }    // systematic bias in the iteration throught the heatbug
$ i! x+ U) u$ J, h4 Z    // list from timestep to timestep7 o' l7 w9 t0 m* I: S1 ?' U
        
0 r4 G$ \* e0 ^+ j9 f. [, Y    // By default, all `createActionForEach' modelActions have8 i! \0 U. a' p3 r0 z1 c
    // a default order of `Sequential', which means that the7 \0 j+ H: J4 [6 ~" X( s
    // order of iteration through the `heatbugList' will be
$ h. D* n4 Q8 Q* {; p8 K* L3 u    // identical (assuming the list order is not changed
( \: u+ e, L1 q) O/ H8 b- o    // indirectly by some other process)./ s; P+ S$ D6 W
   
6 V& |7 j: k7 }$ a, Z1 S( x6 B    modelActions = new ActionGroupImpl (getZone ());
8 D: w# ~* w6 Z+ _# V2 T! ?4 g, b5 k, \: f% }8 x
    try {" E  l8 B' N. [: D
      modelActions.createActionTo$message
5 v% o, U% T$ v/ Z1 v' t1 K1 Q        (heat, new Selector (heat.getClass (), "stepRule", false));
! ^4 u' Y, X* j/ d    } catch (Exception e) {
$ h0 F$ \8 S* e3 }2 ]/ J3 x      System.err.println ("Exception stepRule: " + e.getMessage ());
: L/ D/ Z  W3 t    }
$ L% W- Q1 H7 P- S& E- {; n
8 z& F; _& A. b% d    try {/ E' Y& T( M; r0 I8 z
      Heatbug proto = (Heatbug) heatbugList.get (0);; X) T1 j1 q( P! Z$ @5 i, e
      Selector sel = + p/ H& t0 P) [, H( m( k: z0 G
        new Selector (proto.getClass (), "heatbugStep", false);
+ l# t. Y# |3 M+ l. x0 {2 t      actionForEach =& ]/ o6 h# P9 |
        modelActions.createFActionForEachHomogeneous$call  Q7 I, r8 D) N' L
        (heatbugList,
- x, q# w: E9 y  _! ^# h- u" X         new FCallImpl (this, proto, sel,+ r0 R5 p. l) B( ]) ~
                        new FArgumentsImpl (this, sel)));
: H# R" v- C7 W  B0 Q5 i- r    } catch (Exception e) {
0 h" V# r( Y$ r  d1 G# R      e.printStackTrace (System.err);+ _7 K. G6 b+ f5 G; @
    }: a" m% Q% f3 i5 N4 N. H: u9 v6 m
    1 y" q/ R' ?# ]
    syncUpdateOrder ();
2 A6 x2 H( W+ |$ h
/ o3 _! y. ?. R7 {2 V1 f    try {& ?* t! b8 ^1 i! q* [0 P6 t
      modelActions.createActionTo$message
& W4 m3 H! \1 l( t4 d( L        (heat, new Selector (heat.getClass (), "updateLattice", false));
& ~5 y8 |6 q- [+ l) ~7 w    } catch (Exception e) {
) ]- _: _$ e: Q8 n" H) l+ H      System.err.println("Exception updateLattice: " + e.getMessage ());
8 \  H8 [9 H' K' @6 V$ ?; e    }; P% [; R. `4 z) p+ j. Q
        8 Y" C$ f+ H5 V& _/ _! x+ U! d
    // Then we create a schedule that executes the1 b2 ~* E! s  w2 [: {
    // modelActions. modelActions is an ActionGroup, by itself it0 C  N" l9 a4 r& q: y8 g
    // has no notion of time. In order to have it executed in
' Z3 I0 V. ?/ B, k    // time, we create a Schedule that says to use the
/ B) \) r( ~5 x$ x+ ~1 ~    // modelActions ActionGroup at particular times.  This( b0 H1 s0 p! U0 |. l  Q0 ~" @3 B
    // schedule has a repeat interval of 1, it will loop every
$ X5 I2 n  F* }0 x' W    // time step.  The action is executed at time 0 relative to
/ R$ D% }1 |. Z4 z: x7 E    // the beginning of the loop.
5 b" n$ ]! |3 m! b
4 G" U" O& r8 d8 M' s; `    // This is a simple schedule, with only one action that is: ~8 t  s. T2 H8 _1 @/ _
    // just repeated every time. See jmousetrap for more  K5 Y+ ~% Y& f
    // complicated schedules.
& l. Y; T8 W; s* [" W  . d: w  A7 l7 g
    modelSchedule = new ScheduleImpl (getZone (), 1);3 H. g2 ]. h* p, r4 d: S
    modelSchedule.at$createAction (0, modelActions);( V  W6 d3 x, @; [. i
        
9 F/ C  X" l* \# M; N6 b" K    return this;
$ i8 E1 {1 K3 W8 O  }
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