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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:% S% Z6 |& _5 M% ~" C) C

, Y  a. g: K% b" x1 D public Object buildActions () {
$ B6 V8 n. Q5 _0 W. \    super.buildActions();
! U# n3 ]4 ^* r, M0 O   
' ]9 W2 H* h4 R9 s9 E7 k6 X    // Create the list of simulation actions. We put these in
! [2 V) @- z7 V- V9 @( B" U& s3 c, }: |, b    // an action group, because we want these actions to be; [/ @3 |$ {0 A$ _" ~/ r$ P  W& h$ `
    // executed in a specific order, but these steps should2 o; E" Z6 X! J- ~
    // take no (simulated) time. The M(foo) means "The message0 I5 {7 R% x5 F3 Q
    // called <foo>". You can send a message To a particular
, {" T- e) K9 u8 ]7 f" [  D  n    // object, or ForEach object in a collection.
( ~) R7 G3 T, B- s. x# S) y, Y        8 C5 n0 }5 Z& Q$ {
    // Note we update the heatspace in two phases: first run3 }" v+ J5 N( f' v# A
    // diffusion, then run "updateWorld" to actually enact the8 e4 S( p( p; E$ i* |( X  r% i
    // changes the heatbugs have made. The ordering here is
- y' r* i& u/ S% b& `1 f    // significant!1 d7 [+ o3 K4 E1 m' a6 a# F6 z
        
2 E" D2 I# \; M& a! {    // Note also, that with the additional
7 Z! t' T3 x0 {; k% R% p    // `randomizeHeatbugUpdateOrder' Boolean flag we can
: c0 B. V3 d7 ~) f: p    // randomize the order in which the bugs actually run
6 a7 Y/ T: w. Y    // their step rule.  This has the effect of removing any6 ?! U: G5 Q- y! |9 z
    // systematic bias in the iteration throught the heatbug: H: r- ]1 n# u% [: l! d& o
    // list from timestep to timestep# \3 v) W( q* `# I
        
0 ?$ k! Q6 G& b  Z, \2 X' c, l' Y8 Y    // By default, all `createActionForEach' modelActions have
9 S5 M) W+ H2 w  A) u    // a default order of `Sequential', which means that the' J" @0 k0 ~' b1 U: n
    // order of iteration through the `heatbugList' will be" ^3 p8 e+ B; r8 ?6 R9 i* |
    // identical (assuming the list order is not changed% U3 x* `* K0 \3 r; |" p: t
    // indirectly by some other process).
7 d$ m9 Y) `2 G3 D+ {- X/ h+ y    : Z0 L% G6 z+ V* Q& b1 Q
    modelActions = new ActionGroupImpl (getZone ());: ?8 ~+ Q) K0 h0 w* B" K

8 F+ Y* z0 a- n$ P# g    try {
2 T. S5 V% K1 T  W. @4 o, G! M: }      modelActions.createActionTo$message1 ~! T7 N1 \1 n9 J6 O/ }1 [
        (heat, new Selector (heat.getClass (), "stepRule", false));
  K, e- s: t% n8 T6 b  P    } catch (Exception e) {
: X7 G) R0 F5 S& D# A1 b- q0 ^+ c      System.err.println ("Exception stepRule: " + e.getMessage ());
" n# p- t4 a# }1 N9 @. X    }
$ j6 g: L+ g4 t2 f& |
, U1 ~( ?$ u1 v: Q9 u% W& H) Z    try {7 m: v& y% w) ^
      Heatbug proto = (Heatbug) heatbugList.get (0);) A8 r% j2 ~1 h$ q# }/ k  q
      Selector sel =
% O  m! D7 N9 M! I: A# e  n5 t8 _        new Selector (proto.getClass (), "heatbugStep", false);3 x$ V- x* E7 u5 y& v
      actionForEach =
: G" k+ M: X# H7 r: W( x        modelActions.createFActionForEachHomogeneous$call7 O' L# k0 @4 i1 L2 k
        (heatbugList,* j6 B5 {  N% i- n5 T
         new FCallImpl (this, proto, sel,7 |" r# }7 o$ F
                        new FArgumentsImpl (this, sel)));
  x. b: ]7 I, ^' B$ J( k! Z    } catch (Exception e) {* c6 a$ h5 z$ W# w0 \
      e.printStackTrace (System.err);
  s# |: b  u7 p, R    }$ v+ D9 j5 `# {2 \# [2 N! |$ D
   
1 r" k: P  R, M2 d* K' Z    syncUpdateOrder ();
% r$ \1 S- Q4 {+ _. K/ Q# H. W) e  h  z6 u5 p
    try {
7 U+ @; y/ r7 v      modelActions.createActionTo$message % n. C/ b$ _+ C, R" c4 i, g
        (heat, new Selector (heat.getClass (), "updateLattice", false));
" v3 Y2 G  X1 c) R7 D6 s    } catch (Exception e) {
( l9 L$ H" X# H7 G1 o2 O      System.err.println("Exception updateLattice: " + e.getMessage ());
0 P, Z( k# B6 t" k    }" f: i3 t+ |2 \$ N# D* H5 Z
        ' k4 d; p& Y6 w: m7 _0 \& E( }
    // Then we create a schedule that executes the
( E  j1 I4 W" H. G6 j3 i4 C    // modelActions. modelActions is an ActionGroup, by itself it
+ o  ?' y' w1 L    // has no notion of time. In order to have it executed in
* P- l* F" N) X: B+ [9 Y    // time, we create a Schedule that says to use the
& e# ]: ~" {  z, K    // modelActions ActionGroup at particular times.  This, H" I; z$ a* x, n3 n
    // schedule has a repeat interval of 1, it will loop every
+ o" X" H, x' x6 ~9 a: U/ M9 ?    // time step.  The action is executed at time 0 relative to7 r$ m1 M% d: f" g; q0 ?: O
    // the beginning of the loop.* s# i% z* d: Z

0 B& t- N9 {( X5 M! o! D    // This is a simple schedule, with only one action that is
' @0 _2 d/ t% U4 `, G2 N3 O; b    // just repeated every time. See jmousetrap for more
0 k) v' `6 E9 w1 s% c    // complicated schedules.9 ^) ~) o$ e% O# f+ |7 F
  
7 Y( r6 o- J- y1 C* Z9 L1 J' j    modelSchedule = new ScheduleImpl (getZone (), 1);; S1 X+ k3 N, Q2 s3 R' m+ V" d
    modelSchedule.at$createAction (0, modelActions);
  y, g  o8 ?5 s        
" ?* F# @+ }+ M$ _; ]    return this;
" r# K' E1 ~5 V! j/ D+ [  }
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