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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:
0 _/ j" @+ a& p) Y9 o' D
% K% _( j: J& U, j! e4 t' }: Y public Object buildActions () {" Q$ ^) O2 M/ O6 l
    super.buildActions();
/ Z6 h# X: g3 g   
+ ^% R% Y  M' A2 q- n    // Create the list of simulation actions. We put these in
% r1 \; E- [9 O% X0 l    // an action group, because we want these actions to be' u- b5 z/ l, M7 A3 `
    // executed in a specific order, but these steps should
+ k2 v8 ~, W& X0 J    // take no (simulated) time. The M(foo) means "The message/ w/ y) J' g9 c5 c+ N7 q
    // called <foo>". You can send a message To a particular
- I: `  G) C  h8 x, N4 e/ u    // object, or ForEach object in a collection.
" G. L3 d5 j7 }) i) p, @  d$ H        / [) a; s7 P: u. V" ?& N
    // Note we update the heatspace in two phases: first run
/ r, m# q4 D: u( m4 K! Z    // diffusion, then run "updateWorld" to actually enact the8 r/ R- s( `* ^
    // changes the heatbugs have made. The ordering here is# d& ]/ ^: ~: W3 H2 d1 i+ T
    // significant!
7 M1 C8 m! n+ w& m8 Z$ E        
, W9 Q' g' ^; v  ~# F2 t    // Note also, that with the additional
2 a6 r% _$ s6 k" G- }7 ]    // `randomizeHeatbugUpdateOrder' Boolean flag we can1 d: B) S" r6 }, d$ O
    // randomize the order in which the bugs actually run8 i5 l' \* b5 K7 B3 Y$ g
    // their step rule.  This has the effect of removing any
! F1 d: M8 B* T2 O: s0 U    // systematic bias in the iteration throught the heatbug
; \8 N# W: w1 s/ j1 T" i9 v" ?    // list from timestep to timestep0 K, S/ L. ]+ o
        2 r: f, X% Y' I& `
    // By default, all `createActionForEach' modelActions have
: {4 b) `+ H: k7 J    // a default order of `Sequential', which means that the$ @- b* e5 ?/ F
    // order of iteration through the `heatbugList' will be$ Y% `9 j4 q! D! y: z- U: {, ?
    // identical (assuming the list order is not changed
7 F" C' g( v% u' O, b" z: Z. _    // indirectly by some other process).
$ u- i7 l' C0 L+ k    % a1 P: I- A; N: n: Q
    modelActions = new ActionGroupImpl (getZone ());# h5 t. J) n6 f8 [& Z4 m
2 Y1 K. O) W8 ^; H0 T, y
    try {, K1 R1 p  O9 C) ~9 o
      modelActions.createActionTo$message- r. }! I- y7 i# c& l
        (heat, new Selector (heat.getClass (), "stepRule", false));
# B# m# h2 E/ X: E% {8 _    } catch (Exception e) {9 x* B3 v( {- a2 _% }  k
      System.err.println ("Exception stepRule: " + e.getMessage ());
; q+ W" g4 e* f3 G7 S    }
+ ]6 D& b" N2 w$ n5 e, Q* ~& x$ d) i3 p" P1 ?$ Y
    try {
) U- z) I8 a2 E) E$ t      Heatbug proto = (Heatbug) heatbugList.get (0);
8 y& B2 E' v# ^* p, _' F8 l      Selector sel =
0 _# ^' a  o, z/ h( Z        new Selector (proto.getClass (), "heatbugStep", false);3 w! T' M( q6 Y7 l' ?1 E1 m
      actionForEach =
4 P, M2 p7 p3 J3 x3 \4 X0 n8 S        modelActions.createFActionForEachHomogeneous$call' B- t: h& L# i9 B) n/ E5 t" X' z) n' ^
        (heatbugList,1 J! _+ O, z" x4 t! |# U3 e3 h0 O- z
         new FCallImpl (this, proto, sel,0 A: V0 u0 |2 T# B
                        new FArgumentsImpl (this, sel)));
. S4 t9 w+ q1 O    } catch (Exception e) {3 D( O' F" _( M2 ]- j
      e.printStackTrace (System.err);! \. z$ m9 E* ]* g- o1 a
    }
9 k" ]+ ^$ j: H$ ]/ k# q2 a   
3 G9 E) T9 Y& e    syncUpdateOrder ();
6 f' C, F! Q  k9 V! ?
6 ~: B+ k8 H2 p- W/ ]    try {! `+ t) u3 H! ?# z0 Z- d! }8 E
      modelActions.createActionTo$message
: ?8 ~: o5 D1 |1 }        (heat, new Selector (heat.getClass (), "updateLattice", false));
; u; i# H" j6 K+ [" R1 a/ @2 @$ ^$ @    } catch (Exception e) {
! d  L& m6 ^$ t! u4 l2 O: A1 Y      System.err.println("Exception updateLattice: " + e.getMessage ());
: T2 d$ t0 b+ t7 B5 J. E( Z    }
& ?4 g5 U4 L8 c& g1 n# b# Y1 j$ H6 p          V% x* z) S4 ~5 X6 `" c1 B! `$ h+ X
    // Then we create a schedule that executes the
) `, D: w/ H  J" v' I2 l    // modelActions. modelActions is an ActionGroup, by itself it
( B4 N8 z: R9 s. _. C) n    // has no notion of time. In order to have it executed in- A0 n* r4 m; h% v
    // time, we create a Schedule that says to use the
- B2 V* K; s0 c+ Y1 |    // modelActions ActionGroup at particular times.  This
. h9 p* p& e# `8 N1 O    // schedule has a repeat interval of 1, it will loop every
/ S$ h0 g; N* x$ ^8 d    // time step.  The action is executed at time 0 relative to
5 p8 T; P& R0 J, K    // the beginning of the loop.
1 g* H9 J8 l3 [
0 D; m- E. W3 Y  d9 f- a. F( Y) M9 [    // This is a simple schedule, with only one action that is- A6 W" t7 r( u# b" z
    // just repeated every time. See jmousetrap for more
/ F+ j0 l9 }) T1 D  D    // complicated schedules.- b% [' E$ h5 \! o
  
2 p8 G- L! k) x8 W    modelSchedule = new ScheduleImpl (getZone (), 1);
  s3 H" C  T. m  D4 P, s    modelSchedule.at$createAction (0, modelActions);
3 p8 O0 _; J! u" F8 M        
' Y$ o5 D* |  S3 e" c' e. w  ~" v' d    return this;+ [: ~9 ?; t! w' ^5 K/ q
  }
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