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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' i! u! Z. O; w# u! Y( }

% b9 X8 p! i6 R& c: ^, g public Object buildActions () {& C3 d3 @) }5 n& V
    super.buildActions();: o% |( I6 M8 C
    ; k, N3 J0 y5 k; k2 N% M$ ^# ?, a
    // Create the list of simulation actions. We put these in
) D8 Y) }. Y3 s% R, K# A    // an action group, because we want these actions to be
* S% t% B+ `2 |& T! _+ F  ?    // executed in a specific order, but these steps should
& [! d% A2 h& ]4 k. o2 ?    // take no (simulated) time. The M(foo) means "The message# p2 [  G' z7 b
    // called <foo>". You can send a message To a particular( i- f/ \# ~# q+ {6 x$ \# F
    // object, or ForEach object in a collection.
" Z' h! b' u. l* i        7 ^* @; f  x- P2 h$ h  S- |& k! h
    // Note we update the heatspace in two phases: first run; w4 l2 b, ?% A3 m7 v% M
    // diffusion, then run "updateWorld" to actually enact the
: I# O2 s. N9 u$ P- T' B  U0 A. @    // changes the heatbugs have made. The ordering here is
, m' d- w( _( G# g    // significant!: E: M5 m& X& z1 r; {9 G  P
        
, W2 h& C' ]0 v1 H, ~0 Q3 k    // Note also, that with the additional
" H/ l7 o) _2 Q- }1 G+ @' w3 w  C    // `randomizeHeatbugUpdateOrder' Boolean flag we can
3 B5 c0 e& Q) \: u, f$ }( ~! }' @    // randomize the order in which the bugs actually run& W' |1 u1 A% f8 Y
    // their step rule.  This has the effect of removing any
1 S7 s5 t6 A+ h7 W( M3 t    // systematic bias in the iteration throught the heatbug
9 @- j# f- M* [$ Z' ]+ K! h6 D6 n    // list from timestep to timestep1 E5 n  A* v4 y, F. A$ m" @% |
        ' x# Q/ i4 _' o
    // By default, all `createActionForEach' modelActions have
& {" d  O, t# ]! s    // a default order of `Sequential', which means that the
' Z( g% O0 l* H: R; ~$ x    // order of iteration through the `heatbugList' will be
& y) ~& j: z" U+ x& c$ \    // identical (assuming the list order is not changed
( K# N2 h' ~. q4 J' C    // indirectly by some other process).
; a7 X$ {* H* o( r4 h   
4 c( D; t7 K( L1 {* d* @6 V& D7 P    modelActions = new ActionGroupImpl (getZone ());
* @: ]- U) n% j' b8 E3 j* M
' y# \5 n- ^/ W8 C, g/ m$ X& W    try {" x1 p) Z8 L. v7 ~5 `& G" E: `' H; M
      modelActions.createActionTo$message7 b/ O6 X: K+ \+ ~7 P) k5 T3 o
        (heat, new Selector (heat.getClass (), "stepRule", false));
2 J0 L7 w+ r! \0 r) E6 |! g    } catch (Exception e) {
) J; I. V* U( t0 |2 o      System.err.println ("Exception stepRule: " + e.getMessage ());& u# x! e) c/ w+ W
    }& A$ w! b: B) s

4 v' v$ e1 i9 ~- ~% J4 D1 d+ S    try {
* k3 R, D1 m$ m8 l      Heatbug proto = (Heatbug) heatbugList.get (0);
, }# j# ]4 V. I& w2 J      Selector sel =
8 o% P2 V2 ~/ ^: w        new Selector (proto.getClass (), "heatbugStep", false);
7 Q+ g- q9 p$ b" t) \5 W5 j' H      actionForEach =! M$ p8 `9 n5 c7 H+ V
        modelActions.createFActionForEachHomogeneous$call+ l+ {( M; |3 @! t4 T/ ~# K7 M6 i
        (heatbugList,
  h% i( \9 f7 x: k         new FCallImpl (this, proto, sel,
* w0 J9 l" M* y0 F                        new FArgumentsImpl (this, sel)));
) ?- K' y6 ?8 B& D0 n5 g+ F    } catch (Exception e) {' z. w" k) L" V7 E
      e.printStackTrace (System.err);# b& e  i$ S: |5 ^
    }
* S6 F0 H" \* H$ [7 e8 K   
9 t0 l9 D4 g7 B1 b+ T7 f    syncUpdateOrder ();
8 E; D! p& w" O/ k1 n' N" F, u1 n
& E: F8 S$ T+ [/ m& B- q$ F    try {
  ^4 v" Y7 H! t9 W, q: O4 b1 m      modelActions.createActionTo$message
6 s1 u" v3 q; v4 U  I% e        (heat, new Selector (heat.getClass (), "updateLattice", false));* ]" t* P  \/ o- A  }6 f) C
    } catch (Exception e) {
+ H, Q, y% Y* }4 V+ J! r' S7 @      System.err.println("Exception updateLattice: " + e.getMessage ());
+ I' U  m( Z5 U# ?% u& r    }. S9 i. k2 F7 ?" S6 W' K/ z1 M' ^9 B
        0 q& U; Q2 U/ i! x
    // Then we create a schedule that executes the1 D+ \! \) a+ n1 m
    // modelActions. modelActions is an ActionGroup, by itself it
2 p5 T) ~. E0 i' h3 }5 |9 h$ U    // has no notion of time. In order to have it executed in: s) q# u2 j" f9 a/ o0 i) R9 E
    // time, we create a Schedule that says to use the# D9 a& v# Q9 N
    // modelActions ActionGroup at particular times.  This7 a: J" p6 d. n
    // schedule has a repeat interval of 1, it will loop every
: V- `: c" B4 j* O7 `9 q    // time step.  The action is executed at time 0 relative to
; o/ X$ t' q( f1 |' }: o, z    // the beginning of the loop.
4 {( n+ |/ `( Q, z7 ?8 E5 n4 V; O' q4 n: q
    // This is a simple schedule, with only one action that is1 y. i+ g* z) X& |( P9 R
    // just repeated every time. See jmousetrap for more! V2 }0 @! F5 B$ y
    // complicated schedules.* Q( t/ ~- Z* F0 y" g: Q, K+ T& J
  
7 K3 z$ y: P8 {( p( P: b# l    modelSchedule = new ScheduleImpl (getZone (), 1);
. {: k0 h! w- S. V, q    modelSchedule.at$createAction (0, modelActions);6 G4 C# ?8 T/ Y" ?- w
        
. q% B1 v* C& j, R$ u    return this;
" Z) [1 S6 e7 S% g* I0 w  }
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