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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:2 r" V/ q/ D/ c: @7 r- g

1 u1 R  u) H3 O3 v' h! j0 Q6 F public Object buildActions () {# b+ ?" R" E8 {- t; N3 W" T4 l
    super.buildActions();. Y9 D+ G$ F$ Q5 K
   
8 ?8 @$ x0 g9 H    // Create the list of simulation actions. We put these in
, ~0 x: @7 O! d0 o    // an action group, because we want these actions to be
+ ?% o* s& ?2 N6 j6 p! K    // executed in a specific order, but these steps should% S4 l1 w* d  ^* k+ G: C( |
    // take no (simulated) time. The M(foo) means "The message/ ?. \; P  Q" m' A! ~% k
    // called <foo>". You can send a message To a particular
9 I1 J& E  ^1 T7 W    // object, or ForEach object in a collection.
# a# c! h$ J5 L, D5 \; U  h        - O: D/ T6 H. u1 B
    // Note we update the heatspace in two phases: first run" u6 w" c* e+ ?, B8 b9 h
    // diffusion, then run "updateWorld" to actually enact the
6 _- i5 a( U" f$ ^7 D  z, j( Z    // changes the heatbugs have made. The ordering here is5 b5 a2 j# [3 l: ]8 N, \( Z) b
    // significant!
; g5 V: A/ ^8 r1 P        2 ?/ {' m5 _/ X; O, W9 B
    // Note also, that with the additional5 S" L" {  I  l6 U, H$ W( w
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
# e* P0 q9 X- ~1 ?( O0 e    // randomize the order in which the bugs actually run8 K7 p# h5 S9 c  Y% z+ G
    // their step rule.  This has the effect of removing any
* k+ Y% L: z6 f. M. ]+ d% M; _    // systematic bias in the iteration throught the heatbug
% O3 m2 X, T8 C" g8 E6 r    // list from timestep to timestep. \$ }* T2 y, n7 @; A
        # m2 R$ U# I" |2 e) H! b
    // By default, all `createActionForEach' modelActions have: p) r  U8 W; M- s
    // a default order of `Sequential', which means that the& n! V! H$ {2 ^; L5 z/ ?
    // order of iteration through the `heatbugList' will be8 O4 k6 @% c# E+ b# ~
    // identical (assuming the list order is not changed% P; O* G; h+ U) r# P
    // indirectly by some other process).! l6 a1 A" `8 P5 q, \
   
1 g+ r) y  r' M" c2 z1 Z    modelActions = new ActionGroupImpl (getZone ());
# L* [, C4 u1 e# v, [$ R. b" V1 E& Y* e5 s  I
    try {" W: t3 z8 D% g
      modelActions.createActionTo$message
- p8 k, G  {+ `        (heat, new Selector (heat.getClass (), "stepRule", false));
% W, x2 \4 _& e! R- V    } catch (Exception e) {
6 _+ {, \$ [+ A0 M+ q8 o      System.err.println ("Exception stepRule: " + e.getMessage ());
6 y% ]5 u  [9 p$ Y# A% A    }. o! W+ w% [& E' H

% h% ^: r% a: s    try {' X( O9 z6 J4 `: v- m2 n
      Heatbug proto = (Heatbug) heatbugList.get (0);, L% }; m0 d# \/ g$ |4 @
      Selector sel =   ^" O& X* B, V- C  A
        new Selector (proto.getClass (), "heatbugStep", false);
* e$ ^3 r2 g; Z! U      actionForEach =4 I* b7 C' L4 i; L) G
        modelActions.createFActionForEachHomogeneous$call% P% ~1 }) M* {3 Y. W5 ~
        (heatbugList,# m* [6 s4 P: B2 ^* C! E
         new FCallImpl (this, proto, sel,# L) ~; U' X& f4 u0 t! F
                        new FArgumentsImpl (this, sel)));
1 `+ l/ O+ Q' I2 R# G2 Q) u    } catch (Exception e) {) |. _; J4 I% J% r
      e.printStackTrace (System.err);
8 [. S+ ~2 i9 Y# l; a% x1 s* H    }
6 e0 x( u9 T9 ]/ L( R% Z7 G0 o   
5 J( L" v! |! A2 {* f1 c! r* |    syncUpdateOrder ();7 h  l# b- K3 J

: E; f2 u8 R( c# A4 L* ?8 u    try {
- l( r6 s0 Y0 L7 H9 J/ c      modelActions.createActionTo$message 7 u9 R. L+ r" _; A& C" ^
        (heat, new Selector (heat.getClass (), "updateLattice", false));6 U" ?3 o6 @. \# k4 ?0 E; {
    } catch (Exception e) {+ W6 W9 M6 D$ W( f8 k
      System.err.println("Exception updateLattice: " + e.getMessage ());3 C2 ?% d# q" v* d. ]' b" E& d4 R) l
    }
/ I2 G4 l5 H5 r        
5 f  N# \" p) I# x9 P5 p    // Then we create a schedule that executes the- o9 _3 y! y/ T# y4 b. l
    // modelActions. modelActions is an ActionGroup, by itself it5 B5 n+ _7 H4 ~7 B4 J
    // has no notion of time. In order to have it executed in3 V: B# t0 z1 n; ]: s
    // time, we create a Schedule that says to use the! m5 W+ s2 s* V, }
    // modelActions ActionGroup at particular times.  This1 K- \  F% s! r8 C9 [
    // schedule has a repeat interval of 1, it will loop every' j3 W4 e. P# v# o0 E
    // time step.  The action is executed at time 0 relative to% L8 ?8 A' _# ^  K. U, X
    // the beginning of the loop.
" Y' K* X/ C! p* {
2 E7 y; C7 c+ b9 ]3 }    // This is a simple schedule, with only one action that is
" B( y/ `* z8 [" Z6 |    // just repeated every time. See jmousetrap for more& a, q4 o3 I* s6 C% L, [0 a* ^) t
    // complicated schedules.0 r4 L9 l( N: \. ?8 n
  
! M0 {5 Q$ E: v7 p- o. k    modelSchedule = new ScheduleImpl (getZone (), 1);0 U! H& n: X3 M1 m. T; L
    modelSchedule.at$createAction (0, modelActions);4 P. z0 D# I( L
        7 f" |; _- p$ O' j; T5 i
    return this;
& ]: o" @, N7 c$ g" g  c+ T' r  }
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