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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:7 [% K( I+ F$ `; {: e/ S

+ z; r8 l& S* o* B% c public Object buildActions () {8 i. N* q' ]# H4 k6 Y0 l
    super.buildActions();1 A" q# v* `) a, ~8 S7 C
    # V" m, M: q5 X- z
    // Create the list of simulation actions. We put these in
1 z$ d7 T' l# M- C    // an action group, because we want these actions to be
4 S( K5 z" V1 S0 e    // executed in a specific order, but these steps should
, h( }: U6 S& R# x; {    // take no (simulated) time. The M(foo) means "The message
6 e5 {7 p. V3 o    // called <foo>". You can send a message To a particular: L$ ~! ~2 ~, i4 ~2 H9 A" i
    // object, or ForEach object in a collection.. O: ^9 A3 D2 q: z6 E7 [
        9 A7 L6 `; _, k% U
    // Note we update the heatspace in two phases: first run9 d, p' I' K- |% K' C3 u* p
    // diffusion, then run "updateWorld" to actually enact the) b, k4 B- L# q, j6 ~5 ]+ Q
    // changes the heatbugs have made. The ordering here is
' e) d4 y/ F" v8 s4 h" [% l, c    // significant!
! O' q# }' V( ^9 l        ' h0 F, q0 @8 O5 G  f8 |: p
    // Note also, that with the additional
% d/ ^0 {! _2 K7 z/ c, L4 V- X6 o& ], n    // `randomizeHeatbugUpdateOrder' Boolean flag we can
4 ], G( `9 S' d    // randomize the order in which the bugs actually run
9 Y8 V8 Y9 s% o  u0 t! e    // their step rule.  This has the effect of removing any% ?4 J; K) r" L/ F
    // systematic bias in the iteration throught the heatbug
) F9 p+ M; @9 t1 @  C    // list from timestep to timestep1 ^  b- T; L) p  B9 `/ v2 n" |
        
& z2 ], R! C& w1 Q    // By default, all `createActionForEach' modelActions have- y3 z% i( D# @- {# n! F
    // a default order of `Sequential', which means that the
3 Z# f" F0 I6 {* d8 o    // order of iteration through the `heatbugList' will be
- O9 x  X6 f. o# J% O( s    // identical (assuming the list order is not changed+ B$ ^2 ?. e7 u
    // indirectly by some other process).
; O, u% ?; l( \7 i+ O    # _+ h6 `5 t1 T8 m2 i. _0 H
    modelActions = new ActionGroupImpl (getZone ());
% O; r' s5 ?! s9 Z3 [6 d' ~% b/ Z6 S0 [+ H
    try {+ i, j& N1 c  ^, s' ~4 N
      modelActions.createActionTo$message
; ?+ O: {3 ?- `4 s3 ^        (heat, new Selector (heat.getClass (), "stepRule", false));* F9 `3 J5 F! m' t; g' _. c
    } catch (Exception e) {
; w% }  U% \& K* S! p% }      System.err.println ("Exception stepRule: " + e.getMessage ());5 O" P  l! ?# K( V- k" A2 Q
    }
2 u) u: T4 D& z) l& B9 f, g
" q& m5 X& u4 R- n% N3 F" B    try {- N- w' b4 Y( L: U: K  `, \
      Heatbug proto = (Heatbug) heatbugList.get (0);/ p) U1 f) {! R, w2 b6 I$ U0 j- |6 N& M
      Selector sel =
' s4 x/ E7 O9 H5 P9 @7 S+ p        new Selector (proto.getClass (), "heatbugStep", false);  q0 ~# I; o" ~/ a5 z8 ?
      actionForEach =3 m! ?' F6 Y7 P
        modelActions.createFActionForEachHomogeneous$call
+ S0 B( r$ s5 C# M% j( O" e        (heatbugList,/ @3 g! D7 E3 Z( X- t- r# `
         new FCallImpl (this, proto, sel,
) t* p: S* k, k3 i3 N                        new FArgumentsImpl (this, sel)));, U# N2 L0 C: s: K; ~% Q& `
    } catch (Exception e) {
! R9 }  O3 S2 u* q' j' ?      e.printStackTrace (System.err);6 Y# H) |5 }) J( g: Q( A. r
    }
6 ?- }9 a' i& |6 ~* ~    . j) `# P1 U6 ]) N( n" ~0 ?
    syncUpdateOrder ();( e% Y3 e8 c- \9 n& A

3 J# C7 ~( P. ~3 V) q    try {
* `+ J9 G9 C5 W) {. t      modelActions.createActionTo$message
$ R- \3 a6 d) A( N* o: ?1 I        (heat, new Selector (heat.getClass (), "updateLattice", false));2 m! Y( c3 d/ E9 h$ f0 H
    } catch (Exception e) {: y. U7 y  }. A1 r2 Q, B: }; x4 p" Z
      System.err.println("Exception updateLattice: " + e.getMessage ());# H* v) V8 Q( H% p' I" y
    }: B: a* w2 P# @- d
        6 w. a, c2 q' x7 D" O! F. L
    // Then we create a schedule that executes the8 v; t' _/ j8 Y0 L
    // modelActions. modelActions is an ActionGroup, by itself it
. a6 t# h( e- `2 [: Z) X    // has no notion of time. In order to have it executed in7 r! o, }* d8 P5 ^* L2 O! {. _
    // time, we create a Schedule that says to use the5 L& A( A& ~6 u$ m
    // modelActions ActionGroup at particular times.  This
1 [* r/ B: x: N+ _/ |    // schedule has a repeat interval of 1, it will loop every
& k$ r/ N6 ?- d0 W/ \; b! Y    // time step.  The action is executed at time 0 relative to9 C0 j' m) U+ \8 g9 H
    // the beginning of the loop.. e0 h5 g8 w& ?7 I" O! x
3 V1 P  a/ q" D) M- S
    // This is a simple schedule, with only one action that is
5 k, r( {4 P+ ^  H3 ^3 J7 x    // just repeated every time. See jmousetrap for more+ T, o* e4 }6 i! c
    // complicated schedules.
+ x* O/ V4 v- y+ s, c- q, o" Y  7 C4 E9 R: Z9 }# c& c7 K4 u
    modelSchedule = new ScheduleImpl (getZone (), 1);8 Z* T1 U2 N8 E8 \, R: V
    modelSchedule.at$createAction (0, modelActions);
$ t1 R; y$ S( e        
; o7 r: _0 r5 I4 C* z7 X    return this;
; a2 X/ H9 N' E6 ], e/ i3 B$ P3 F  }
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