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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 () {- q- _8 p+ _: _
    super.buildActions();
/ z+ c9 z2 }0 l0 ]* B0 t7 K$ P( t! S   
9 ?7 f. U  C1 r0 f    // Create the list of simulation actions. We put these in
/ v7 G7 V2 L+ d    // an action group, because we want these actions to be6 F2 b) z. Q  o; n/ u5 R
    // executed in a specific order, but these steps should
, l4 Y  O4 R' O) @& R/ |    // take no (simulated) time. The M(foo) means "The message# w) {" {, v+ Y8 r/ P
    // called <foo>". You can send a message To a particular
4 N# v, x* u" l' b: |    // object, or ForEach object in a collection.
) G  X$ p; a( C7 S; \& P        5 `; t$ Y) m* u
    // Note we update the heatspace in two phases: first run! x" p$ G2 a, d2 e8 O# o2 R+ R
    // diffusion, then run "updateWorld" to actually enact the1 o& u, r4 w/ Q9 j4 x; A
    // changes the heatbugs have made. The ordering here is3 l9 q! Y4 q. G
    // significant!
1 T. @/ s, \! z& s  a3 [8 v          c4 U( t3 F- D2 [7 T
    // Note also, that with the additional5 O, @5 P: z' |. D# m0 A( r: H
    // `randomizeHeatbugUpdateOrder' Boolean flag we can" l/ y7 }( S$ u) W/ U) }
    // randomize the order in which the bugs actually run& Q$ ?5 N* N. ~* |9 b
    // their step rule.  This has the effect of removing any
* v* T6 `5 e" Z- ?1 N0 v    // systematic bias in the iteration throught the heatbug1 q/ m, |3 a* _1 e- f" L( e
    // list from timestep to timestep
1 ?1 t- I( k$ u% V        : f; ~5 `# I0 n* a  z, v% a
    // By default, all `createActionForEach' modelActions have* G, H" A' |4 y& B" h- @) \/ U
    // a default order of `Sequential', which means that the
. `5 v4 `1 q2 f1 d1 l5 A" A    // order of iteration through the `heatbugList' will be. d' \6 x$ q' v& n: G9 e5 H" F0 ?
    // identical (assuming the list order is not changed
& d0 Z6 E9 S( X) y    // indirectly by some other process).
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    modelActions = new ActionGroupImpl (getZone ());2 `+ j1 V6 C5 s2 }
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    try {& U. ]3 d+ V9 c7 V
      modelActions.createActionTo$message5 B! W- j$ X/ `1 d  m* B, w
        (heat, new Selector (heat.getClass (), "stepRule", false));; y$ N8 t. H9 x: t% k
    } catch (Exception e) {
! A' v, [( A% d/ L) X# v- X; i      System.err.println ("Exception stepRule: " + e.getMessage ());
9 |( s  `4 ^7 ~; z+ T9 Y; v    }
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    try {$ _* U3 G6 b$ ?/ A4 o
      Heatbug proto = (Heatbug) heatbugList.get (0);' U& ^& N2 f+ Q. w" K; x1 r
      Selector sel =
; [' n( l6 T1 H# W: \4 Y6 J0 d        new Selector (proto.getClass (), "heatbugStep", false);- A/ W& v  g! U* F. y/ U0 q' r
      actionForEach =, D/ Q! O: D4 |
        modelActions.createFActionForEachHomogeneous$call0 y% P7 F3 u2 g' K4 y
        (heatbugList,( q3 T1 `0 p! @* X" ~; J
         new FCallImpl (this, proto, sel,
5 d8 ~: D  R. @9 x! v" }; k6 c                        new FArgumentsImpl (this, sel)));
; T4 z6 D0 G' g2 {0 X* N. ~    } catch (Exception e) {& k: T; P$ `3 }& d
      e.printStackTrace (System.err);
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3 w( S7 R3 D, j& r$ }9 B& K# E( a3 [    syncUpdateOrder ();
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- ~% I; l- q9 _" m1 o3 O1 v( D    try {
- t/ |  P) E! B; X0 q# \# Y0 k      modelActions.createActionTo$message ) j$ d$ V3 }& [2 m" ^6 L" T$ H
        (heat, new Selector (heat.getClass (), "updateLattice", false));+ ~9 Z+ l5 @% T! ^7 k' t2 m
    } catch (Exception e) {- a% @3 r- f9 Q# h1 v
      System.err.println("Exception updateLattice: " + e.getMessage ());
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        ) q3 O# J4 z+ r. P0 T  M
    // Then we create a schedule that executes the
" w% M' ]. u( d7 f    // modelActions. modelActions is an ActionGroup, by itself it
% w$ y) s. j, @. i, y    // has no notion of time. In order to have it executed in  V) c3 Y6 J  ^/ C: y1 s$ _
    // time, we create a Schedule that says to use the
8 |  ^' }. K$ f2 Q, O    // modelActions ActionGroup at particular times.  This+ b- Y& p+ S$ g0 B- Z% C
    // schedule has a repeat interval of 1, it will loop every
& o1 P3 Y4 I5 A    // time step.  The action is executed at time 0 relative to7 t  k- y9 n8 B, k1 Y6 |
    // the beginning of the loop.
1 w. U( W6 i& }
2 s) B; z: R6 `; E+ s6 S9 q6 N    // This is a simple schedule, with only one action that is
% U& k) a" ^. g2 u    // just repeated every time. See jmousetrap for more
! H& k6 y5 I$ z; `( |- h5 l/ b$ c    // complicated schedules.! `8 L. O/ ?4 D) |  @
  7 w7 V' G% q. Z0 B. Y! u6 b
    modelSchedule = new ScheduleImpl (getZone (), 1);; E. n, D5 K' W2 R7 c( M& f- M$ n
    modelSchedule.at$createAction (0, modelActions);
! b; ~! [; k) ]) q) \$ G: {        
0 A) h# o: f8 N8 _    return this;
4 y' t+ t: [; w3 q0 c/ I  H# T6 y. a  }
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