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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 _* S  _/ n' |: q
1 h$ m! [. n! I9 g# ^ public Object buildActions () {
. `: ^. `! g& f' g7 t! Z    super.buildActions();6 Y: ^/ l. S7 j2 y
   
: t6 S( X5 q. V5 o    // Create the list of simulation actions. We put these in1 X9 R. Q* s; m2 R+ G1 Y
    // an action group, because we want these actions to be7 D  D8 D( d! F- ~
    // executed in a specific order, but these steps should
8 B# g* Q4 }$ \) m+ D    // take no (simulated) time. The M(foo) means "The message) P! P) j! A/ V. G
    // called <foo>". You can send a message To a particular8 L2 |) d9 s1 E6 _
    // object, or ForEach object in a collection.1 K3 f3 c* k& i# E, o, V
        
- M8 {( @; g; f/ x; I    // Note we update the heatspace in two phases: first run
7 J+ W9 h. A: t2 x, c    // diffusion, then run "updateWorld" to actually enact the
% e5 m$ t7 q3 M$ @    // changes the heatbugs have made. The ordering here is5 \  A8 O/ A% p/ M! n0 \, z
    // significant!( g7 D& F9 N  M3 Y
        5 Y( |5 l5 q/ ^1 ]- {
    // Note also, that with the additional
. o) N1 z- R' H/ B0 ]4 K; L    // `randomizeHeatbugUpdateOrder' Boolean flag we can" I% g$ m: z8 \  W" i; j1 B6 p7 f# T
    // randomize the order in which the bugs actually run0 A/ S! L8 M. h% i* r# i4 [
    // their step rule.  This has the effect of removing any' a: o+ @* e2 A; u0 c
    // systematic bias in the iteration throught the heatbug
  E+ Z8 V1 W/ H( G" v    // list from timestep to timestep
. e+ E' n/ v8 U* ]! V        , v; K( x; C$ `- I
    // By default, all `createActionForEach' modelActions have
. n* T5 T6 D6 `+ r- Q    // a default order of `Sequential', which means that the
* }' x- A& y# d, A  y9 Z8 t    // order of iteration through the `heatbugList' will be! q1 c& z( Q; D+ x+ b& Y, `  ]
    // identical (assuming the list order is not changed0 d/ @3 Y! i: X  Z1 E
    // indirectly by some other process).2 f$ _, k+ S% O; Q5 Z
    " k* T' U" y" L# j, t
    modelActions = new ActionGroupImpl (getZone ());; b- H2 t' G+ s. l" f. n

! j1 B! s7 O/ C    try {; G3 |" Y: O$ j8 G
      modelActions.createActionTo$message
' L5 i5 p0 Q- [2 l+ ~( E8 W        (heat, new Selector (heat.getClass (), "stepRule", false));
4 s. g; r3 p4 `; N6 a    } catch (Exception e) {8 o) i% w3 a; n8 Q) ^' {; P0 P
      System.err.println ("Exception stepRule: " + e.getMessage ());5 E! j; i  {1 ~3 P, |
    }# r9 \* _: q# {3 k

: B% c1 w" v. l    try {% |( D6 o7 J% B
      Heatbug proto = (Heatbug) heatbugList.get (0);
9 d- E$ p6 I( o0 e! g3 s      Selector sel =
" l& v# C: g  Y" F        new Selector (proto.getClass (), "heatbugStep", false);: F1 a1 q: X# T6 a/ X8 ~0 q8 c1 W  P
      actionForEach =' ^) Z. p  n/ Q, {  S. l5 N( w) V) U
        modelActions.createFActionForEachHomogeneous$call' J$ [+ R: u; |/ ]0 {* B  e
        (heatbugList,
$ V( }3 r) q2 o+ k- }4 Z& M0 y         new FCallImpl (this, proto, sel,; v7 G6 L6 S* e& N$ X2 C
                        new FArgumentsImpl (this, sel)));
% g, W/ ]5 }( I; X  m    } catch (Exception e) {% t$ r( s3 J1 l
      e.printStackTrace (System.err);
1 M! L- Q, V' ~! @. n0 U& m' d4 [# t    }
& o" t0 @- Y; v5 j. \# B* ~: {! N: k   
* G- o5 c$ w% G3 v# _3 o    syncUpdateOrder ();
9 M. ^1 ^6 ^3 h) e2 ]9 G9 }
+ `: U& x6 G9 [6 g; I    try {* a  X  ~6 H5 N. @! J  b, z( c
      modelActions.createActionTo$message & k# O6 J$ O" f6 x8 y
        (heat, new Selector (heat.getClass (), "updateLattice", false));) l* U4 s, v+ e+ h% Z9 {# c0 i
    } catch (Exception e) {
0 P, J# a: j4 k& N! P/ `% r      System.err.println("Exception updateLattice: " + e.getMessage ());; ?) N/ e0 R. _& K4 c& K
    }# _. D( E) o2 P5 i( a5 N2 z9 j
        9 {0 [5 b- x( V) Z
    // Then we create a schedule that executes the
4 i) j  ]: z$ x8 x    // modelActions. modelActions is an ActionGroup, by itself it
9 G) a2 o6 ~9 |% f! n1 T4 c    // has no notion of time. In order to have it executed in
+ X( |9 B  b" H, Q    // time, we create a Schedule that says to use the
- f; b4 O7 S( Y* i( J1 P( {! y    // modelActions ActionGroup at particular times.  This
3 V2 H1 K/ j7 \) x, ]    // schedule has a repeat interval of 1, it will loop every# y4 J. E. S' h& E" n( E% G
    // time step.  The action is executed at time 0 relative to
4 ~: V' ?% D5 `5 h+ c* y$ ^6 K    // the beginning of the loop." p7 J+ W2 K  ^: z  S! i

% i/ E0 l& Y2 Z, w! j1 k! h    // This is a simple schedule, with only one action that is
# b; o! `; b1 r9 v- K  B  o    // just repeated every time. See jmousetrap for more! Q. \8 |' p* X' A( Y
    // complicated schedules.; D( ?& h2 D: X8 O2 J- u. g2 f
  
7 x9 f$ r7 m: V7 V    modelSchedule = new ScheduleImpl (getZone (), 1);9 o' d( W& {" j7 Z. p
    modelSchedule.at$createAction (0, modelActions);' @5 K$ r6 A1 C% j" C! }& l
        
" P/ W2 I4 d5 [3 w" _* j) F) ^4 o    return this;
* \" V8 V* {8 M. @( r  }
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