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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" h  {( S! e, V8 M# k
2 L! t  _, j3 O/ \7 G; d& B2 }
public Object buildActions () {
( _  m- n: D$ F    super.buildActions();
2 y  \, [3 v9 v5 {    # x& l) B1 V0 l4 P* h
    // Create the list of simulation actions. We put these in
7 W. H, M/ l5 J5 B$ H1 D7 N" q    // an action group, because we want these actions to be
! }1 ~$ u- J, m- o    // executed in a specific order, but these steps should# Q5 d. \' Z! T6 v
    // take no (simulated) time. The M(foo) means "The message0 L0 t; U8 B- j& f
    // called <foo>". You can send a message To a particular5 P4 l: o. c& j/ ]3 F1 i
    // object, or ForEach object in a collection.
6 Z2 c, V" Z  A& W. \        
3 d* C/ K0 E' R' y    // Note we update the heatspace in two phases: first run$ f3 M$ S9 E7 L- H$ {1 J: Q
    // diffusion, then run "updateWorld" to actually enact the  A& P' M4 ^8 r  @. F$ p
    // changes the heatbugs have made. The ordering here is
0 L- z6 g- O( V& u    // significant!
. b% |! ]  M5 C- U$ v- v        
% ~( }7 G$ a+ u6 z' z9 D; _+ |, [4 u    // Note also, that with the additional5 D  M# X8 d7 N
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
( ?  {! \1 k; w! Q% _    // randomize the order in which the bugs actually run
! X0 K: T9 Q5 e    // their step rule.  This has the effect of removing any; y$ p+ Z6 z7 E7 r0 x& r2 h0 a
    // systematic bias in the iteration throught the heatbug! H) o0 ?: m+ f# y% y0 [
    // list from timestep to timestep
* t& ~1 F, S" a, f/ w, W' k        ! @( q% P+ y; v- }, K7 w
    // By default, all `createActionForEach' modelActions have
  x9 e2 n, O* p    // a default order of `Sequential', which means that the
9 Z$ O" y9 B6 j! l. I. w5 P$ j    // order of iteration through the `heatbugList' will be
- h7 A9 Q9 p; E4 K, ?# V9 t    // identical (assuming the list order is not changed
1 D& n& U6 K2 Z+ r+ D    // indirectly by some other process).9 o# q8 Z1 B7 b0 r7 H: |) ?
   
" V" X- D" C4 ?0 J) y+ m    modelActions = new ActionGroupImpl (getZone ());
% g9 ?1 h, u) s. u) D0 \% F! V0 o8 P" Q  S+ d# `( [3 G: ^3 v
    try {
) j8 |8 b0 s6 O; J      modelActions.createActionTo$message2 L  s: [  ?$ @" K6 V1 I
        (heat, new Selector (heat.getClass (), "stepRule", false));
0 h* i5 z8 n2 }+ ?# b) [    } catch (Exception e) {
3 E( [% ~6 n" T8 q# U. |* |* _      System.err.println ("Exception stepRule: " + e.getMessage ());
5 u- N. V/ Q, L- s7 X- m    }
: s# c2 \* v2 Q6 \. T- J& _) e% F( Q
+ p, \$ y2 O) d# [0 H" @0 v, T    try {) l' F8 D' L2 F6 r
      Heatbug proto = (Heatbug) heatbugList.get (0);
& A2 Y3 C" A% B3 h      Selector sel = 3 O9 {; _- E: [6 O! p7 j
        new Selector (proto.getClass (), "heatbugStep", false);3 C7 |- y7 r; K6 x" T$ o# w
      actionForEach =! F( U0 a& G. p
        modelActions.createFActionForEachHomogeneous$call
0 N% n6 t. Y  ?( d/ b$ X        (heatbugList,
$ C+ |9 _* h' Q/ x. R! R) s# i         new FCallImpl (this, proto, sel,* {; k4 m1 E+ H( w. U
                        new FArgumentsImpl (this, sel)));
2 g1 ^/ m( M2 Y+ O! u8 Q0 m    } catch (Exception e) {
0 ~; Z8 X) o- F- Z0 e* m! [      e.printStackTrace (System.err);1 M2 x0 D, b7 n4 z" i/ m
    }
$ f0 a  i- M8 `    3 S& W* }" W% K! A
    syncUpdateOrder ();/ X0 U, j5 W5 {. N% k; T7 m

/ y/ }  q6 @' {; B    try {
& D, U7 N( `! S. c7 n      modelActions.createActionTo$message
* o& X) z# _3 N4 f        (heat, new Selector (heat.getClass (), "updateLattice", false));% K: k/ p9 B+ a+ k0 n9 y& o5 I7 a
    } catch (Exception e) {
! @  i% u& ?* \6 g      System.err.println("Exception updateLattice: " + e.getMessage ());3 i+ _( i) h+ M* ^" k' a
    }
/ D  q' P5 c  k5 _1 M5 |* V/ z        4 N& |: ^, v" P1 N
    // Then we create a schedule that executes the4 R' F" n+ D7 Y& m" c% @' Y( m
    // modelActions. modelActions is an ActionGroup, by itself it- s0 Z. P( y) o. O  X
    // has no notion of time. In order to have it executed in
. H( w" i3 g( Q, K4 H/ }. |    // time, we create a Schedule that says to use the: q) D; y$ c" K. Z; s
    // modelActions ActionGroup at particular times.  This7 i1 w+ r8 [4 u" n: `3 u6 f
    // schedule has a repeat interval of 1, it will loop every
8 G) R8 P) @' ^3 h    // time step.  The action is executed at time 0 relative to
& `3 D& @. ~# ^8 \: u% x! p8 ^    // the beginning of the loop.
: p2 @; y( |  R8 a
2 n. z1 T, @1 ^( m9 p    // This is a simple schedule, with only one action that is, z4 m9 E3 |2 ]
    // just repeated every time. See jmousetrap for more- ^" {( [7 _6 s+ }0 j6 U5 P  }
    // complicated schedules.
1 W# t3 L' d5 {1 k3 O5 L  / F3 w7 q/ W' P" J% S/ M
    modelSchedule = new ScheduleImpl (getZone (), 1);
, [7 s8 @& \3 }/ W* P    modelSchedule.at$createAction (0, modelActions);
# H% G# P' `, w6 l- P: U3 \) D        ; H- V+ H1 y4 T- V7 W- H9 [
    return this;, Z* W) Y, \- n; o
  }
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