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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:7 i, r% k; K0 s- [
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public Object buildActions () {  M% s; J7 F# F2 y
    super.buildActions();+ d# |2 `* D7 o: c. U: O0 f8 A4 D: z6 v
    * p5 V, J' x( m. J( D
    // Create the list of simulation actions. We put these in% ?3 Y5 J1 }* b
    // an action group, because we want these actions to be% B, m" j2 Q- q$ @
    // executed in a specific order, but these steps should
2 A6 A7 x! ?% M  D) [" h1 j; ]    // take no (simulated) time. The M(foo) means "The message
" v* f3 M1 q  O- I& p; [2 X1 _    // called <foo>". You can send a message To a particular3 [3 ]4 g5 @* q1 x
    // object, or ForEach object in a collection., @* F: u' Z$ U3 a+ _
        
+ A+ Q: U: X( _6 j3 P/ T1 Y    // Note we update the heatspace in two phases: first run
" Q* b- Z" D$ O# h& B1 M  ]* i    // diffusion, then run "updateWorld" to actually enact the/ n  A8 h9 u, v& S6 M: E
    // changes the heatbugs have made. The ordering here is9 n( c3 ?3 {8 X3 l
    // significant!
' Z; d: x- _( _+ k3 d9 W9 p/ K        
7 h9 L! a2 T# T    // Note also, that with the additional. l5 I( x, t/ E" T, D9 h
    // `randomizeHeatbugUpdateOrder' Boolean flag we can# k9 H" H8 O$ o1 _* b6 t! d9 {
    // randomize the order in which the bugs actually run
5 z& \/ a7 |- y4 m- C- J$ R. D    // their step rule.  This has the effect of removing any! I. U. h0 k6 }) ^" Y7 h, N, K
    // systematic bias in the iteration throught the heatbug
& y  q6 ]) ~, x  D% p    // list from timestep to timestep
$ ?4 g: q& p' [! c/ B  T9 I        
' J. D! t1 M& o! p    // By default, all `createActionForEach' modelActions have0 @) b1 e, y# D1 x8 `. u4 x
    // a default order of `Sequential', which means that the7 @4 o# ^6 b/ V# x/ s% V
    // order of iteration through the `heatbugList' will be
6 G3 L4 d" \# w! D. ?8 r4 d' Y' Q1 ~    // identical (assuming the list order is not changed
) i2 r/ y- R$ v* p  @4 ]  Q    // indirectly by some other process).( |  ~) x! }: w3 Q
    * _+ N  {% N- |9 h" A: b
    modelActions = new ActionGroupImpl (getZone ());
9 j- s8 D, a# p& k) h+ j
( ]0 p3 W% W9 P8 @: W) Z    try {5 g% S: V/ Z6 w1 T  f6 C& m
      modelActions.createActionTo$message6 f4 h* X, X; }9 ]# e3 b; c
        (heat, new Selector (heat.getClass (), "stepRule", false));9 G1 @* m' {. u7 i' l' d0 `
    } catch (Exception e) {
) l# |! ^8 ?, Z: V5 }* f      System.err.println ("Exception stepRule: " + e.getMessage ());
' L  H7 Y3 ^$ M8 h4 T$ a    }8 a4 m, U) e, K' Q
8 K: y- l& ]: r, t& ^+ r  _) j
    try {  X) O0 @: j" g. k
      Heatbug proto = (Heatbug) heatbugList.get (0);# L9 ?9 r, I9 o( Y( ]
      Selector sel = , V) s) s- C- G2 \5 I
        new Selector (proto.getClass (), "heatbugStep", false);: {, c* S+ h4 K; h
      actionForEach =
! o- g0 S0 ~& S1 l+ F0 b        modelActions.createFActionForEachHomogeneous$call
% G6 {) b( L( x& K# ^        (heatbugList,
  X+ Z) i2 j  G0 I) ~- ?8 Q# T         new FCallImpl (this, proto, sel,0 H+ I. I' J% H& O' @0 Y8 I
                        new FArgumentsImpl (this, sel)));1 ^! ^1 L8 c; J8 j" O) \( d0 t; p
    } catch (Exception e) {
: p" v1 j' E. p- X( e! F( `      e.printStackTrace (System.err);
$ C) L' P/ _$ W* k5 G' A    }
8 D+ l* n6 Y6 L& r) B    ' e, N- R" L! r" l/ W; S/ ?! k
    syncUpdateOrder ();* m) h1 ?4 L' u

7 Q0 Q9 {+ [$ B, u: r' C; |    try {8 ~: G8 b1 r2 _5 E3 h: C
      modelActions.createActionTo$message + p: H6 C! a8 w5 {) H4 |% k
        (heat, new Selector (heat.getClass (), "updateLattice", false));8 R6 L$ F) X6 e: |  r/ j, A
    } catch (Exception e) {
3 _) |5 t0 z9 K9 q1 \8 W) d      System.err.println("Exception updateLattice: " + e.getMessage ());
. s. j9 p. \7 P& L6 M! i: {    }
. N% M  d" f1 }  F        : M7 ~, K3 g0 I! }) z; J
    // Then we create a schedule that executes the: W% S0 f& a+ s5 g& @' p) ?/ W3 J
    // modelActions. modelActions is an ActionGroup, by itself it
% A1 A# i) I9 O( R+ i! ?+ i    // has no notion of time. In order to have it executed in
7 |! @# p! E9 S: Q7 i    // time, we create a Schedule that says to use the
6 d- C* _8 D0 x3 K% `    // modelActions ActionGroup at particular times.  This
+ G$ }3 V- M. L; ?2 |6 N    // schedule has a repeat interval of 1, it will loop every+ _2 n* q+ N+ N( T7 P+ k- I. N  m0 a
    // time step.  The action is executed at time 0 relative to
. {5 _3 q$ O% L8 B/ p+ z; x    // the beginning of the loop.
; y/ S: S# l/ B4 ~
' \! k  t7 p7 b5 p6 l- z    // This is a simple schedule, with only one action that is& P8 W$ y- {9 X% V; f
    // just repeated every time. See jmousetrap for more) l% R! W8 V6 E
    // complicated schedules.
; @2 F/ H0 u4 H/ _; H# S' D  
, D! V4 @# H& U; X; r    modelSchedule = new ScheduleImpl (getZone (), 1);+ Q" r7 n5 y' k# X: G$ p
    modelSchedule.at$createAction (0, modelActions);
# ^# X! D) `  s" d" `% z' d        : u' A% M+ N; |: k
    return this;
9 f/ e& A' _0 w# [7 O! U  R# x* `  }
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