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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:
' C7 C; p7 l+ i
$ z+ C4 Q9 ~. J/ F6 g public Object buildActions () {
' D4 C! N* Y/ m) _8 C& S# @6 S, e: S    super.buildActions();+ x+ m* W( k" C5 v
   
' U2 X; ^+ c( |& Q0 O# A    // Create the list of simulation actions. We put these in4 k1 T' q+ [6 K4 D" O
    // an action group, because we want these actions to be! M4 S6 ?9 U: g2 E
    // executed in a specific order, but these steps should
% w' U  K) l) x8 o7 N: ~0 U    // take no (simulated) time. The M(foo) means "The message
9 \7 ^( }( B/ K3 G7 o  [    // called <foo>". You can send a message To a particular
4 U2 b% w% R1 x    // object, or ForEach object in a collection.# @+ k& ]% n' j3 `: d2 K% O
        1 M" |4 b' t% N" k+ Y7 D% e, {6 a
    // Note we update the heatspace in two phases: first run
7 ~# \, l' a' ^( j: Z    // diffusion, then run "updateWorld" to actually enact the
7 F* h( k# [0 I# }: V; K    // changes the heatbugs have made. The ordering here is
+ S, s9 v( L5 i+ H    // significant!
2 c9 t1 M% C. H  h" h( @        
0 i; P9 F8 b+ y( g* k3 a; R4 k- s3 N    // Note also, that with the additional
( Q$ x. g( h! Y) L  l: c    // `randomizeHeatbugUpdateOrder' Boolean flag we can* A: x* y" W% B3 h! y& Q/ e- c
    // randomize the order in which the bugs actually run
9 C+ V3 p/ M8 h; N+ `$ C  O2 |    // their step rule.  This has the effect of removing any
' \9 V6 J* q) F5 @7 T    // systematic bias in the iteration throught the heatbug4 n+ }6 I7 d5 m
    // list from timestep to timestep
2 ]; ]1 `4 a: @* f) R+ y( O4 Z        
& d% \5 f7 t, Q( Q, ]) N    // By default, all `createActionForEach' modelActions have5 S$ ?4 c, U8 V
    // a default order of `Sequential', which means that the
& _# R$ \& j# x8 E2 W3 Z. a- s    // order of iteration through the `heatbugList' will be' r& _; m) m7 w. S
    // identical (assuming the list order is not changed, }4 l5 \! u: ]$ N
    // indirectly by some other process).# @& u  M0 X& }( R  J) H
   
) U! f: y! E% |% }1 b* s$ {    modelActions = new ActionGroupImpl (getZone ());
5 h5 ]* [1 P, Y* l
3 z: R/ G, H' {% P2 L4 a    try {
& M& h) d  D" O0 W1 V7 `2 F      modelActions.createActionTo$message
8 ~" f# m1 {' N- x; M, }        (heat, new Selector (heat.getClass (), "stepRule", false));( H5 V# c* m! y5 ^* ?
    } catch (Exception e) {5 g* c6 I7 V( ^  w) N: w
      System.err.println ("Exception stepRule: " + e.getMessage ());8 I7 v8 s4 m# b  p# ]
    }
. \8 m, k0 T8 S/ b! }" V1 C. ~1 a0 ~: d
    try {3 @) ]5 G! f# x; P4 @0 W
      Heatbug proto = (Heatbug) heatbugList.get (0);& |; c! M* ]9 @& F7 G0 V
      Selector sel =
2 C$ e0 ~2 m8 k( X+ a4 I% ?* C" ^! n6 c+ L        new Selector (proto.getClass (), "heatbugStep", false);$ {5 m" D- t. g8 J
      actionForEach =
$ `: d+ Y0 k& s+ D  I        modelActions.createFActionForEachHomogeneous$call
9 ^; o' I6 y3 d% x        (heatbugList,
; H- t% ~& s2 s- G8 S' {5 H         new FCallImpl (this, proto, sel,
" `8 X, x/ R+ h4 y                        new FArgumentsImpl (this, sel)));, Q9 P) u: v" P, h/ l/ U
    } catch (Exception e) {' D4 x( d  c2 t. h
      e.printStackTrace (System.err);+ I. I8 B! J" T* a
    }
0 d/ @% d, i: Z, n: f    2 }0 S% M9 o( m$ q$ l# U
    syncUpdateOrder ();
3 `1 M3 ?. h) c4 M# a) z) E+ m5 t, c
8 {% ]3 j! q+ e5 s& E- \& i& C    try {+ y3 L: ?# g% v" v" k0 D
      modelActions.createActionTo$message   U' `( f+ S# i: G* P8 H+ W- y
        (heat, new Selector (heat.getClass (), "updateLattice", false));) m- v* ?- J. z6 X3 {
    } catch (Exception e) {5 Z# L; G5 h2 q" p6 S
      System.err.println("Exception updateLattice: " + e.getMessage ());0 W( a3 d+ X$ C3 x% O
    }
" p- x) _: M& n4 u: |        
3 ]* |" Y3 V0 K' y$ D    // Then we create a schedule that executes the4 \) x- ~$ ?, {/ t2 k
    // modelActions. modelActions is an ActionGroup, by itself it; Z& h  T- x1 ]2 U4 C" `  _
    // has no notion of time. In order to have it executed in' R+ W' b, K# E' [
    // time, we create a Schedule that says to use the
- L  H& `/ @& F& q    // modelActions ActionGroup at particular times.  This! s2 F1 A0 s" p2 e- Y
    // schedule has a repeat interval of 1, it will loop every- u0 j' H8 F. W. s/ `- p% P9 f
    // time step.  The action is executed at time 0 relative to
" R4 D: e/ w6 C2 e% p9 }    // the beginning of the loop.* u  y, ~: D( h- S
4 H& y: ]- ~( `6 ]9 `
    // This is a simple schedule, with only one action that is
4 l8 ~- d! l% a8 C& d    // just repeated every time. See jmousetrap for more' p9 [; x$ \$ B* Q' ]
    // complicated schedules.( L  J' u5 r/ s# J  i
  
2 x. i3 v& U7 D    modelSchedule = new ScheduleImpl (getZone (), 1);, R" v0 p/ S4 V1 |3 t& W
    modelSchedule.at$createAction (0, modelActions);4 V/ @( A7 b( D( E: L$ l, Q1 I
        
: S3 U6 j  \" `; O' [: B    return this;
% f* ^: s$ X9 y  }
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