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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:' s1 H, I( e1 J
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public Object buildActions () {" K% b0 e8 d  b- D% K
    super.buildActions();
! w1 X; r% q- D9 `( q$ E. X  I    . k2 Z/ f8 C4 m6 D, b6 K! u
    // Create the list of simulation actions. We put these in
) ^- l0 l+ c# N; T3 [    // an action group, because we want these actions to be/ y2 x0 w% M' U% x% P' g# e0 F
    // executed in a specific order, but these steps should( y" u- z) P6 b, t8 O
    // take no (simulated) time. The M(foo) means "The message1 q9 m0 i# L' w* z& n( d2 A9 H
    // called <foo>". You can send a message To a particular% r" L" o1 |! g0 M& A3 e  X, }
    // object, or ForEach object in a collection., C0 `' F# Z. Z( _/ z
          [  i: \2 ?* l2 a5 h' y- K
    // Note we update the heatspace in two phases: first run, n, a9 H  Z" \4 F8 w
    // diffusion, then run "updateWorld" to actually enact the8 Y/ q/ j' `# B1 [# \/ k
    // changes the heatbugs have made. The ordering here is
' x  E6 j5 c0 `    // significant!
/ C" g2 x% r% {. Q; N' e4 H3 {        5 x; k8 z. D7 c
    // Note also, that with the additional
' \1 ?* h5 q7 m# J" K/ [9 B- W. i3 _    // `randomizeHeatbugUpdateOrder' Boolean flag we can4 [4 |: b1 o% h4 a8 V1 G8 D
    // randomize the order in which the bugs actually run
' t: o0 ?- F5 A    // their step rule.  This has the effect of removing any
: S) g) r: `/ H0 m: d' G+ I    // systematic bias in the iteration throught the heatbug1 Q7 X/ ^( o: i
    // list from timestep to timestep: k9 {5 [7 A8 S$ n7 v1 @) D" L7 f
        # b5 p$ A9 {/ F9 N8 m8 T1 Y0 n
    // By default, all `createActionForEach' modelActions have- E$ T* r5 K: y! j
    // a default order of `Sequential', which means that the, L- x( p0 p+ |2 N$ F( g
    // order of iteration through the `heatbugList' will be
, w8 ]/ `$ H/ ~$ S4 }1 f    // identical (assuming the list order is not changed
% j# ?( O' a  O3 N/ X' n/ Q    // indirectly by some other process).* l  C+ `0 R. t
   
7 V  O) q8 A+ f0 w! ^    modelActions = new ActionGroupImpl (getZone ());
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    try {
5 }5 i8 H9 e8 y2 X      modelActions.createActionTo$message. h- L9 U  e2 e, `
        (heat, new Selector (heat.getClass (), "stepRule", false));- a& @  W# s' I* @6 |9 j4 h4 I
    } catch (Exception e) {
* F: x# m5 y9 w7 j      System.err.println ("Exception stepRule: " + e.getMessage ());
: }, `- U0 ^2 k5 _    }
, p' o6 w% k( e+ T) [& g! ]
% X8 n( W1 K/ N) J" E% y/ R7 q# B    try {) F' O, K8 k* B' ~/ q
      Heatbug proto = (Heatbug) heatbugList.get (0);% k- G  U; ~; g
      Selector sel =
, \, g  a( T4 H/ u        new Selector (proto.getClass (), "heatbugStep", false);' o% `0 G, }, |- y) t
      actionForEach =8 Q7 Z6 V) K4 r8 C; }% n/ x* [
        modelActions.createFActionForEachHomogeneous$call* \$ D. S4 p# F6 c
        (heatbugList,
/ x9 X3 E) D0 u# g! k, A         new FCallImpl (this, proto, sel,
% z: c- x& [! V                        new FArgumentsImpl (this, sel)));, _. @+ \( w$ F6 d3 h3 t
    } catch (Exception e) {
  c* m6 O' w6 @$ m7 U- A' a      e.printStackTrace (System.err);
1 q) ]* w; {& i$ N& z    }. {2 }  |# O( N% V& {- v$ |
   
: N$ d) `9 g) l: A  T1 r    syncUpdateOrder ();
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/ s4 l, S) H7 U! S; r" R! U9 X    try {
( V  B9 A3 K4 @* |/ o0 `      modelActions.createActionTo$message
% H) p5 M3 \9 o7 s        (heat, new Selector (heat.getClass (), "updateLattice", false));
9 [$ M3 \; J# |    } catch (Exception e) {
7 C' O9 h, u4 {8 |/ u2 Z  b& Y      System.err.println("Exception updateLattice: " + e.getMessage ());
9 U3 N7 w, ]+ u    }5 N: ~0 q/ D& ^9 t8 {, V# J
        : u% g# Q( X& j! X& l8 B# |
    // Then we create a schedule that executes the
, a" V! L6 X0 i    // modelActions. modelActions is an ActionGroup, by itself it
1 w4 F! [& a# L: Q' Q  V$ T" I    // has no notion of time. In order to have it executed in
/ C0 u: K, J2 `, N    // time, we create a Schedule that says to use the
; w  i* @! h2 w) H7 }    // modelActions ActionGroup at particular times.  This
/ a; H, u4 w& r8 B) N8 Z5 Y    // schedule has a repeat interval of 1, it will loop every
5 n, l% @8 W" s; Z    // time step.  The action is executed at time 0 relative to8 A, x- H0 r& }: Q1 j
    // the beginning of the loop.
* c: n9 U% g/ t
$ p$ D( ^  Z7 d5 v9 W0 N, U    // This is a simple schedule, with only one action that is
- x  _) R; I" ?    // just repeated every time. See jmousetrap for more
& L5 Y2 d& e7 I( F) [" w9 i    // complicated schedules.
& `1 N( p5 [1 V! _  
# F/ m0 r0 @/ u: {2 ?. O2 I! `    modelSchedule = new ScheduleImpl (getZone (), 1);( e( q$ r8 t& g  T
    modelSchedule.at$createAction (0, modelActions);
& \8 G9 S! `7 r5 M+ Y        2 L# l9 C1 V5 x7 \2 }6 @5 m3 C! f" S! {
    return this;
0 e8 U4 C) v; v; Z  }
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