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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:9 ?8 Q/ a9 I1 q- J0 g

. r" F2 w2 v6 P public Object buildActions () {
, x% Q# N1 a8 J0 n# K    super.buildActions();
6 N7 i9 b# X( k) H3 m. R   
' v" _0 y3 i, Q; Z' B; ~4 ^    // Create the list of simulation actions. We put these in
8 ~- X$ Q! e5 T! ~" k    // an action group, because we want these actions to be4 D5 t+ h4 G& j' e) ~7 k
    // executed in a specific order, but these steps should+ x5 i' A/ u! y6 Y: l% N' J
    // take no (simulated) time. The M(foo) means "The message
! L( b. c' M/ U8 Y; B) H& K5 m    // called <foo>". You can send a message To a particular
: V0 s1 ~# @5 M/ L) c1 k    // object, or ForEach object in a collection.
6 @9 P( b5 o- p  m  v, f9 s        % m, A/ F& }. y3 J) u" k: x; L
    // Note we update the heatspace in two phases: first run
* F3 y, H0 W( y+ j* O8 B/ r+ w% ^    // diffusion, then run "updateWorld" to actually enact the7 z9 Q6 v4 p, H. j# g2 I! U
    // changes the heatbugs have made. The ordering here is
% Z: {9 P( ]- X! c& |    // significant!$ A; L3 f5 u/ {, F
        
& g) e6 z. }5 _4 i' R# i$ k    // Note also, that with the additional
" N2 N7 u9 }) f" O    // `randomizeHeatbugUpdateOrder' Boolean flag we can* j  d. L% `7 e! J% `, x
    // randomize the order in which the bugs actually run/ z# M7 r) e6 k+ m5 i: _5 q- I
    // their step rule.  This has the effect of removing any: P( z4 |' Y1 }) s. R% F% u# l; @
    // systematic bias in the iteration throught the heatbug
! r3 K) l2 u$ I4 \    // list from timestep to timestep- H9 R9 j9 X/ Y  x- o, t
        $ N2 W1 L2 y0 ^
    // By default, all `createActionForEach' modelActions have/ D# j1 a" |2 M7 T' o
    // a default order of `Sequential', which means that the
5 U4 m# g3 C0 S" Q- }. T" j    // order of iteration through the `heatbugList' will be, ?. Q, s9 e. W$ R3 k" I
    // identical (assuming the list order is not changed/ r9 [' Z; m5 c5 K& O; m& A4 x
    // indirectly by some other process).2 A( @, {1 g% O8 q
   
' q/ Q# ?  b1 ]  o( b    modelActions = new ActionGroupImpl (getZone ());- y- ~0 U; {/ Y# W( {% p& s
$ J6 `* m/ X' S* b  U0 n8 M
    try {
  T8 _! D5 z1 r# U  W7 i: V      modelActions.createActionTo$message
, S6 D1 L1 W/ A- _% X3 ?        (heat, new Selector (heat.getClass (), "stepRule", false));
% O$ Z" h( ^8 y6 a7 o9 U    } catch (Exception e) {
) G1 z' u- t6 |( C& q' f      System.err.println ("Exception stepRule: " + e.getMessage ());) j" D/ D' ?9 H) o
    }4 L; ^& E9 K/ b8 d$ S& T  m- Q+ y

7 Q' u4 N+ u  g' \# x% [0 y    try {* k3 m* e0 c* V& a/ L; J6 h
      Heatbug proto = (Heatbug) heatbugList.get (0);
- k: [+ W7 w  @& C" W; z      Selector sel =
) n& T7 M. b, }' E) o        new Selector (proto.getClass (), "heatbugStep", false);- A$ k5 s1 Y& J' y& t! s. J
      actionForEach =. T( v- f5 o) e0 i- r
        modelActions.createFActionForEachHomogeneous$call
- {7 n, ?4 I7 Q2 L, M+ a( w5 Y; D        (heatbugList,
, q8 j' Z% Z+ m, `1 _6 g         new FCallImpl (this, proto, sel,: ~( S# M$ [% x
                        new FArgumentsImpl (this, sel)));5 K$ q% J1 C! o
    } catch (Exception e) {
! ~5 i' v& {7 M; g3 G      e.printStackTrace (System.err);. h& ?% s6 f, F% [" f0 J
    }  v0 C3 |# R" a5 h# Z% `( \  N
    ) q# N- i1 B  V7 X& y& `6 z
    syncUpdateOrder ();
  O( y  y. n. ~. i" c. [# a, B6 v* z  q7 X" j+ O6 y
    try {
+ ~* i( d% q% G* W) E7 F  Y      modelActions.createActionTo$message
1 _( J5 i1 F% A9 \$ @* l. `' k        (heat, new Selector (heat.getClass (), "updateLattice", false));
, }2 `; k- G" L, T' _6 d& A    } catch (Exception e) {
* V' W  R' z+ s! x# Y- I      System.err.println("Exception updateLattice: " + e.getMessage ());
% u: v; o$ q8 C- ?( E4 @    }
/ J8 [5 w# d' N8 _9 R' e9 }        ( [5 m# N4 a# n0 j
    // Then we create a schedule that executes the
% o+ Y5 |2 Z: y    // modelActions. modelActions is an ActionGroup, by itself it
5 V. ?+ [, v0 T# P2 n( [  E    // has no notion of time. In order to have it executed in
# Z4 c2 @' s2 ?, Y2 [- ?3 v2 Q    // time, we create a Schedule that says to use the; Z3 s6 `7 _. j
    // modelActions ActionGroup at particular times.  This3 V4 ]9 S- k! |! }; h* d
    // schedule has a repeat interval of 1, it will loop every# F2 x) X; t7 N9 f% W
    // time step.  The action is executed at time 0 relative to
" d, j! G; R8 K3 r$ X9 m    // the beginning of the loop.
" I$ L6 J8 t& }; z5 t) G) V+ U" c9 D- ~5 a: B- T" I4 M/ G/ ~
    // This is a simple schedule, with only one action that is0 j& N+ ?* z' y) M; T
    // just repeated every time. See jmousetrap for more
! M+ c4 T9 O* d9 y3 B    // complicated schedules.
$ g3 J1 K: H0 u: a2 u( o0 f, K/ ]  * r- g0 n$ R0 b0 G1 W
    modelSchedule = new ScheduleImpl (getZone (), 1);# \+ ^7 h3 {8 A( K- h* K+ a) R
    modelSchedule.at$createAction (0, modelActions);
3 b, B4 F' M/ |# D! z0 z        - `+ q" h) M# o0 C5 ^
    return this;
; Z) z4 S+ w6 L9 c! C0 r! I8 ]- }  }
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