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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:
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public Object buildActions () {5 r+ ]* U. d+ o8 h3 Z. t
    super.buildActions();
! _) {# r; A* J6 L    1 j5 G  N' ]# ]. V: a- B% R
    // Create the list of simulation actions. We put these in/ a5 C& M" ~: M* V) i! R! H
    // an action group, because we want these actions to be
* t( ~, v, Z2 a0 l    // executed in a specific order, but these steps should$ i. J6 e" ?6 B! x8 \
    // take no (simulated) time. The M(foo) means "The message7 N! ]6 u7 Q: k1 w# s
    // called <foo>". You can send a message To a particular# d, C/ f9 V$ I
    // object, or ForEach object in a collection.. h: m; }! T7 ]/ a9 Z
        ' P2 j8 e! y; j" q3 F$ w6 |
    // Note we update the heatspace in two phases: first run; ?2 l5 O; o9 n$ O3 t" s
    // diffusion, then run "updateWorld" to actually enact the
9 ]3 O% c0 Y( y    // changes the heatbugs have made. The ordering here is+ I. c6 ]" a7 b: w5 p
    // significant!
1 Z5 j+ P4 f) f/ o& _4 N9 m( z5 Z        $ l8 ]2 z) R2 y" s  i- R
    // Note also, that with the additional
' x) h4 ]( H: y; Y    // `randomizeHeatbugUpdateOrder' Boolean flag we can" h7 b0 ], o: k
    // randomize the order in which the bugs actually run3 c5 q: ]9 n1 t) b
    // their step rule.  This has the effect of removing any2 m+ D' c' N8 Y6 ]! m- J5 U% Y
    // systematic bias in the iteration throught the heatbug
* U% Z' u; v9 j7 q2 g* O4 n    // list from timestep to timestep5 @! f0 a: H9 \3 A, f
        
" c! i4 c. S3 O( s9 }    // By default, all `createActionForEach' modelActions have
/ s+ ?. i9 @  M" c# ~* A    // a default order of `Sequential', which means that the4 \; J! t8 K- A0 B; N
    // order of iteration through the `heatbugList' will be
1 g8 p1 G# f! |6 z. _2 G; y    // identical (assuming the list order is not changed2 _/ s8 p3 \% K# @1 |/ b
    // indirectly by some other process).# p/ h/ G# s! S8 e6 F0 q
    # E7 H& a; a1 c$ |9 |& `
    modelActions = new ActionGroupImpl (getZone ());
" ]; d9 U! {) Q# I! G+ @3 _9 P7 f- T! n( V" J
    try {3 N9 U( ]) Q6 G3 x* ?
      modelActions.createActionTo$message8 d' h3 R: }0 x/ r
        (heat, new Selector (heat.getClass (), "stepRule", false));
$ o9 D  c' t9 |- k    } catch (Exception e) {
; T2 _# \4 y% H& W' c      System.err.println ("Exception stepRule: " + e.getMessage ());# n& ~# _# f7 X) b+ Z, x  J
    }
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' U; M6 c3 e: R. j! @5 w    try {1 z! K" i* F2 N; ^9 x- c
      Heatbug proto = (Heatbug) heatbugList.get (0);2 v7 F1 M% ~  W, X
      Selector sel = ) N! _9 j& M1 Q, o/ P* I" z: J' Q' c
        new Selector (proto.getClass (), "heatbugStep", false);; d) D* s9 V0 u0 S
      actionForEach =9 s- w% d6 _' @6 s, I
        modelActions.createFActionForEachHomogeneous$call
  z5 E; T8 h& K- }0 q; z        (heatbugList,
  K1 {4 K2 M! y# L# Q( t         new FCallImpl (this, proto, sel,; S$ r/ [) F0 E
                        new FArgumentsImpl (this, sel)));
2 [5 `& ~- L  X7 o  D; w    } catch (Exception e) {
% A( s0 b3 L$ N/ k$ s  B) i7 c      e.printStackTrace (System.err);
, M; z0 N8 W! I# g) p    }; G) L3 K8 @- M6 v. ~& q
    8 G+ F. j7 d9 }  i9 T
    syncUpdateOrder ();
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3 g9 `. Q4 O2 j# I7 o    try {
7 |" d  L3 Z, K7 F: }      modelActions.createActionTo$message
3 e, y( E6 [# h( S' l3 R        (heat, new Selector (heat.getClass (), "updateLattice", false));
5 V# u# `8 I: @    } catch (Exception e) {$ ^3 \/ A# z( s# P, k, m
      System.err.println("Exception updateLattice: " + e.getMessage ());
0 n+ ~8 e0 A6 _; f    }
9 n9 ?1 v; Q9 ~, W        * ?; d( J. K! T! S2 C1 l
    // Then we create a schedule that executes the
6 x5 g) G# w/ O' }: D5 I6 i3 K/ ~& E    // modelActions. modelActions is an ActionGroup, by itself it: r+ E6 ?/ N4 @, _5 t* E0 j
    // has no notion of time. In order to have it executed in
5 Y3 w, U6 U& K! S5 ?6 v    // time, we create a Schedule that says to use the& Z) W7 ~5 a4 C$ E9 t, f6 p8 g- P
    // modelActions ActionGroup at particular times.  This
* ^3 f9 V2 \9 \1 W/ Z# P    // schedule has a repeat interval of 1, it will loop every9 ^+ f$ d# ^  @- h6 O: k$ I
    // time step.  The action is executed at time 0 relative to1 Z8 R3 l+ F# `% H4 m& T
    // the beginning of the loop.
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    // This is a simple schedule, with only one action that is
; }& ]# Y$ j8 J- O    // just repeated every time. See jmousetrap for more% y& ~) e$ J( r2 {; k+ p2 |- M8 U' {
    // complicated schedules.& q/ p' ]3 [) }# {1 O7 Z& }
  
) V. W2 X" w: V( x    modelSchedule = new ScheduleImpl (getZone (), 1);
: F$ s+ J7 i+ l& k    modelSchedule.at$createAction (0, modelActions);( X: }$ Q1 J1 C
        . f6 w' h$ m  g
    return this;* E! U( z  {3 Z% v$ {: B- Y" n. C" r
  }
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