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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:
. w& `/ Y! `( G$ N
+ D) l# E, S# D. \ public Object buildActions () {
; Z/ t  p  P9 r8 N# d    super.buildActions();. c, p, T5 Z- W, G" [' S
    1 ^. E2 R  N- ?0 p% d) r
    // Create the list of simulation actions. We put these in
( ]; G2 h2 b- _' u# c    // an action group, because we want these actions to be6 p# s4 P1 \2 q1 G. D
    // executed in a specific order, but these steps should. W% s0 {. ^, C3 z3 D
    // take no (simulated) time. The M(foo) means "The message3 Z5 E% ?% F+ C+ o5 d
    // called <foo>". You can send a message To a particular
7 T+ C, @: Z1 v& ~0 t    // object, or ForEach object in a collection.
: S0 d& \+ b8 m/ K        
* y6 p! @( O8 v; g. f3 I; H& E/ B    // Note we update the heatspace in two phases: first run( W& }; ?# @8 Q. a# r  {1 y9 S
    // diffusion, then run "updateWorld" to actually enact the# |4 k; ]- @( ?0 W
    // changes the heatbugs have made. The ordering here is8 ~- Z( J5 [6 Q. W  [
    // significant!
# F: ?/ `: I! _6 e& N, I5 Z        , H6 t1 ?: j9 S. E. g
    // Note also, that with the additional
! U, I0 e1 D# u  x2 m    // `randomizeHeatbugUpdateOrder' Boolean flag we can8 E: O5 v; Q, ~" ]
    // randomize the order in which the bugs actually run, X# L/ O' ?2 S# v5 y2 o: o
    // their step rule.  This has the effect of removing any
3 t% i8 l1 m* Z  \' x    // systematic bias in the iteration throught the heatbug
5 F0 A% Q5 \  ]! O  h3 D2 C# S    // list from timestep to timestep
0 X* u/ v& A  \2 q4 t# Q3 W- ?4 ^* d        & w3 D6 O) u% O* X5 e
    // By default, all `createActionForEach' modelActions have
3 a! n" O+ h9 f9 Z9 F    // a default order of `Sequential', which means that the
# Q$ ~0 g, U0 w4 d    // order of iteration through the `heatbugList' will be
& F+ j: I! w2 a* J    // identical (assuming the list order is not changed0 Z9 V% _' u3 s" @7 ]
    // indirectly by some other process)., a. a* {( u9 E1 C0 t8 T+ o
   
- G; A% k: ^  g2 J7 N& V2 k    modelActions = new ActionGroupImpl (getZone ());$ o8 i0 f( e6 k
: N% L0 t5 d5 Q, Y; [- ]
    try {
2 t0 e& z7 e& c( {% ~& ]8 u      modelActions.createActionTo$message6 t" b9 ?/ f6 {0 i" p* S; l
        (heat, new Selector (heat.getClass (), "stepRule", false));& l" r# [0 {% z# \
    } catch (Exception e) {* s6 Q7 T: m* R6 H+ z& y7 |3 R
      System.err.println ("Exception stepRule: " + e.getMessage ());
( C( @: \& b. v& @4 i: M: l    }
. N) \% e" U. h' x" d& ^
1 A8 ^# |) d' x$ q. V. H    try {
' `! L0 s% [; _4 c$ o      Heatbug proto = (Heatbug) heatbugList.get (0);
  F3 [; f% v6 s+ I3 h      Selector sel =
; P( h# v% k! H, u# v+ G2 L        new Selector (proto.getClass (), "heatbugStep", false);& e1 ?4 k- G9 D( @
      actionForEach =3 B) b9 g8 {3 d" r; S  N
        modelActions.createFActionForEachHomogeneous$call
6 z8 q- O. p0 P' M* ^3 Y6 Y, z        (heatbugList,# \5 P% \* S) x+ K
         new FCallImpl (this, proto, sel,
0 Z! B- U. j  q# H% n1 u) y                        new FArgumentsImpl (this, sel)));0 r0 j2 H, h& ]5 @
    } catch (Exception e) {
& P3 x. w% S- d+ m' u      e.printStackTrace (System.err);4 o# ~! w' i, S7 X/ \
    }
5 L# O" l6 q% u* o/ s0 {% |   
; J( f  i$ }, y8 s9 ~* P    syncUpdateOrder ();
7 K" |$ S. A3 F. q
. K. p" a- ~8 L5 V5 C/ B  I    try {
  _/ Q4 @) }" q5 \5 h6 N. E1 L      modelActions.createActionTo$message
, B4 o& g# ^! ?- e        (heat, new Selector (heat.getClass (), "updateLattice", false));
, w6 Z! h$ ^8 x. j' V! X    } catch (Exception e) {3 P8 g, n# Y5 v7 g. c1 v! r
      System.err.println("Exception updateLattice: " + e.getMessage ());
8 q* h! i: t2 q. t/ [) i    }) b2 x- Q8 m1 D  J/ x$ E, h
        
2 t" W+ n7 V; O, {    // Then we create a schedule that executes the
. t9 }# \4 y9 \# s4 S    // modelActions. modelActions is an ActionGroup, by itself it; t" |& t& a5 ]
    // has no notion of time. In order to have it executed in
' I/ w7 K9 }+ t  ?; {6 @# D1 W    // time, we create a Schedule that says to use the  X; ]+ {7 D9 b- t0 `' s4 J( e
    // modelActions ActionGroup at particular times.  This1 }7 ]: ^8 a" S/ H' e
    // schedule has a repeat interval of 1, it will loop every, L4 ^. B  x* M" t/ f* ~
    // time step.  The action is executed at time 0 relative to
5 S1 y9 R% n6 \, h8 l+ p- W$ B    // the beginning of the loop.
' W# p# c8 N1 P3 k" L3 z: V) Z6 b  r6 {, v; r
    // This is a simple schedule, with only one action that is, Q+ X3 G1 i5 s- K: J
    // just repeated every time. See jmousetrap for more
; p$ ^& g5 l9 B9 Z    // complicated schedules.
$ ^3 Y& U# Y0 s: I7 Q; p, B  
: e+ A# [% v. a. @3 }& Y    modelSchedule = new ScheduleImpl (getZone (), 1);, V. U( M# R& D: \8 Q
    modelSchedule.at$createAction (0, modelActions);
* ~! H; F% E$ B        3 H2 u, C' u9 r7 K) ]2 _8 u8 U
    return this;6 G0 p# m7 B, t9 _! Z2 ?  p  p6 N
  }
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