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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:. ?2 `* i8 C4 n+ R

9 _! Q( J5 V5 K% d9 U7 r$ E2 z public Object buildActions () {
  g+ M1 ^# p/ ]7 N  ?7 X    super.buildActions();) m7 W! ~% @0 {' ^) m! m7 F
    , D, C. W9 a0 [. T. b5 v
    // Create the list of simulation actions. We put these in' R" m4 Q7 A/ Y4 ~3 ^
    // an action group, because we want these actions to be
4 Y7 R1 Y1 W% @9 _( }7 @    // executed in a specific order, but these steps should4 j4 l: \, _* B) `! i7 k. c+ N7 @
    // take no (simulated) time. The M(foo) means "The message
8 X4 Q, s  P2 p6 f) {" @    // called <foo>". You can send a message To a particular6 c, w0 q4 f; y/ H" L' d
    // object, or ForEach object in a collection.
; f! O$ m: I; u1 ~        
) R, i8 X4 \& [  C2 Z3 A( \    // Note we update the heatspace in two phases: first run( f3 D2 T, z" w% B
    // diffusion, then run "updateWorld" to actually enact the7 B* o- d  i, Y( D) p! @! q+ r) A
    // changes the heatbugs have made. The ordering here is0 J. w/ ~* j! W
    // significant!
; O1 h% b3 u' B2 g. D2 p        
( L8 Z7 _' o0 i8 n, i: R    // Note also, that with the additional
- Z0 R7 Y; i/ M  l    // `randomizeHeatbugUpdateOrder' Boolean flag we can
! d" |! S' b- c3 W    // randomize the order in which the bugs actually run" M4 z. _" A) O6 p: u
    // their step rule.  This has the effect of removing any5 I7 E3 O3 s/ X, r& d
    // systematic bias in the iteration throught the heatbug
+ j/ E9 }, {. _( `    // list from timestep to timestep
5 V! X& f: U  [0 U. Q        ' g, t0 A3 \6 `' X  x& _; n- [4 h
    // By default, all `createActionForEach' modelActions have  i& D) W3 t# b8 D/ Q; z; C4 e
    // a default order of `Sequential', which means that the
" a4 q. b3 ?1 z) D& R    // order of iteration through the `heatbugList' will be# u( L: t3 ?* f
    // identical (assuming the list order is not changed
3 y4 c( {/ o3 |- v% ^) y5 C8 w    // indirectly by some other process).
0 T; q7 ^  A1 I6 n4 d   
2 h% T: {8 r5 c2 K    modelActions = new ActionGroupImpl (getZone ());
" m$ l+ Y) \/ ~& Y0 b( z
: q  J: C" W4 ?" ~& |2 D0 H    try {/ y7 W) L% k& u, U4 r4 g; @
      modelActions.createActionTo$message
5 w9 |/ E6 H. {        (heat, new Selector (heat.getClass (), "stepRule", false));
! a% i( v4 e$ b5 }0 C  ?% ~- J4 R* r    } catch (Exception e) {$ U: c" R4 f2 c! i
      System.err.println ("Exception stepRule: " + e.getMessage ());
9 i" n3 ^9 d; F3 [/ I* u8 w0 E% s    }4 U" }# h+ ?& z8 W  R; z3 Z& K

0 ]9 E( e/ |) l* I9 i% m    try {
4 d* T+ R9 x$ V      Heatbug proto = (Heatbug) heatbugList.get (0);: a% u$ s$ s. U: g* V: c/ O
      Selector sel = 2 @- l! d) n* _+ d/ i6 C
        new Selector (proto.getClass (), "heatbugStep", false);# g8 n# U0 Y; n: h2 @. n) t
      actionForEach =
9 S8 Z3 t6 L) }: W        modelActions.createFActionForEachHomogeneous$call
% P- f4 t9 q7 R4 h3 \$ Z* \        (heatbugList,
5 R$ u/ V0 d7 F+ t5 k$ _( I2 {% T         new FCallImpl (this, proto, sel,
0 e, w. _" r' x1 f1 `9 C7 g+ ?% K6 r                        new FArgumentsImpl (this, sel)));9 z9 A: e4 u: z& g
    } catch (Exception e) {, m# V' M8 A) J. F  F+ X, {
      e.printStackTrace (System.err);
6 w* M( v: E. X9 b4 Z    }
" }" z% q3 N  d4 }/ h5 k1 g    ( Q/ t1 z/ \* ]! `) n  c
    syncUpdateOrder ();
7 m7 ~# d$ P3 R7 Q2 N5 u, b2 s$ k
  K6 z: N9 H: o. {+ o' p& v* ]    try {4 p! U7 b5 D/ M
      modelActions.createActionTo$message
; j- ]" a5 w: C- x5 s5 P' `2 Q        (heat, new Selector (heat.getClass (), "updateLattice", false));
. c7 h! E- K  a& r+ ]4 |6 g/ |    } catch (Exception e) {9 O) R3 k- c3 J5 u4 i# Y
      System.err.println("Exception updateLattice: " + e.getMessage ());
3 s  U. J9 {5 r    }
7 [2 ~: h% v$ d- Y$ W6 n9 j, V        : X& [9 |0 A; Q8 P
    // Then we create a schedule that executes the* g6 J* H# s" x' v. Y9 ^
    // modelActions. modelActions is an ActionGroup, by itself it* K. K6 _5 k4 j
    // has no notion of time. In order to have it executed in
' c6 Z) T8 q: }% ~: U    // time, we create a Schedule that says to use the
; ?) _; K( r- i$ s; y* t    // modelActions ActionGroup at particular times.  This
* ?; A  X- X3 x4 U, {    // schedule has a repeat interval of 1, it will loop every
$ N; h7 z; Y; e# o# y, i  g    // time step.  The action is executed at time 0 relative to7 a) e' `# Q& |4 i
    // the beginning of the loop.
+ ~/ ]5 H& ?7 {; C) `" k* k8 H5 p, |% k: Q% o; c
    // This is a simple schedule, with only one action that is4 S, i6 D6 N: [1 d% T' f$ i
    // just repeated every time. See jmousetrap for more
; L7 K9 O0 |* g1 `8 e$ l5 o    // complicated schedules.
6 C$ N% s$ `9 r" i% i  
+ a+ o2 N% H9 |0 q+ W    modelSchedule = new ScheduleImpl (getZone (), 1);2 L3 [& a' L; T2 p8 l: W3 y' p# O
    modelSchedule.at$createAction (0, modelActions);
' ]8 q7 [+ _# m+ I  q& F' B        0 v5 N: {9 @1 S/ Z
    return this;
. U! q+ [( n$ S3 z0 F; s6 j3 q  }
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