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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:0 g; k$ n) M% a2 U; y- M( p
+ j9 d7 M. r: K, e) _9 Q1 b1 i- {
public Object buildActions () {
2 K1 S; P8 u2 I' i9 p8 ?    super.buildActions();: g6 H0 x+ \( R9 j; f* H6 }
   
4 E  c, T9 i/ i* I- f' J& K    // Create the list of simulation actions. We put these in
2 z% \  w8 k$ ~' Q. @7 q  y    // an action group, because we want these actions to be0 U7 M9 g6 `# O) |. ^& p; ^
    // executed in a specific order, but these steps should- D6 ], z7 W" f1 H( _# l
    // take no (simulated) time. The M(foo) means "The message1 s% s3 f; r) A" j8 f" y
    // called <foo>". You can send a message To a particular
( `. i- D* I. G: v5 b0 v# f    // object, or ForEach object in a collection.
4 T$ T. G0 z8 U. y( P+ s        
* _- x! a( d6 E    // Note we update the heatspace in two phases: first run
  o) ]/ s1 L5 ]! s    // diffusion, then run "updateWorld" to actually enact the
4 O" \- t& ^# l( b    // changes the heatbugs have made. The ordering here is' N. Y8 f- l& _& z7 X! `3 f  H
    // significant!
4 e$ L5 i; L2 d8 {        
& W1 p* z' j1 `% |- {8 x6 b    // Note also, that with the additional
9 k) \1 L% Q, C& _. N    // `randomizeHeatbugUpdateOrder' Boolean flag we can
% h& M5 }% O0 a, L    // randomize the order in which the bugs actually run
: S9 x( `" Q1 i! U* \% w5 i    // their step rule.  This has the effect of removing any
' `( ]/ [7 |& d5 x& w6 z5 _    // systematic bias in the iteration throught the heatbug9 j9 Y! |  y! ]4 B3 u3 O
    // list from timestep to timestep
, }  B8 q6 r9 l% x# e+ e        
* ?5 G5 y" `$ E7 [+ d- i    // By default, all `createActionForEach' modelActions have
% d' K7 k5 i) ]. ?( C9 Q    // a default order of `Sequential', which means that the' [; i  O  ]3 `/ L9 J/ a
    // order of iteration through the `heatbugList' will be* o$ Y" }. J2 y" `, h% o
    // identical (assuming the list order is not changed# d0 b* V# J- }0 ]* J2 l$ [# t
    // indirectly by some other process).
% [9 p8 ]7 U) o4 V    * a* C) l6 m9 U+ N% M% U1 `
    modelActions = new ActionGroupImpl (getZone ());' e0 I% t8 @$ y" y1 Q
; s1 F5 J- F- f* }8 R
    try {9 M4 u* D& F! a# {6 Y
      modelActions.createActionTo$message
+ O3 D' s2 U# D; j  m+ s. [        (heat, new Selector (heat.getClass (), "stepRule", false));
* r4 j. q0 m2 s+ y) |* B" @    } catch (Exception e) {
; K9 ?: k) J6 O8 l      System.err.println ("Exception stepRule: " + e.getMessage ());
& B. V; G0 o5 n2 ^0 ^/ Y) s    }
9 M6 R' G2 j9 w' N& U# S1 S8 k5 q: y: z; g; }  j% A! k
    try {
3 \, ~- n. E6 t5 s: C( S      Heatbug proto = (Heatbug) heatbugList.get (0);
% t3 d6 [" w) q% [/ w! U0 Y2 s- u      Selector sel = 6 K1 R' x& J7 T# T1 Z
        new Selector (proto.getClass (), "heatbugStep", false);
9 c) h2 u3 t: J) Y2 l; N% l1 P% ^      actionForEach =' x3 e( @( I" i  O
        modelActions.createFActionForEachHomogeneous$call  [, U6 P! X$ {8 o% a2 q4 ^
        (heatbugList,+ K, T$ Q& M7 B# X
         new FCallImpl (this, proto, sel,$ l  ~7 Q: ?7 n$ x) W9 w
                        new FArgumentsImpl (this, sel)));
; i! J7 t) j0 D3 i! c1 U) M7 \+ l+ O+ c: q    } catch (Exception e) {9 n" ^. {, W1 ~: o* H$ R' n
      e.printStackTrace (System.err);
3 D, l9 X7 ~3 e( B8 z    }: ?5 x* j( c( ?: V1 Q
    . V( A# ?. E2 l
    syncUpdateOrder ();
, z+ d" e9 q. g' V
; x! v% x2 p' n8 J8 G6 w    try {
/ g7 }# h" H% V2 r( a      modelActions.createActionTo$message ' G& W: l& k0 D' j1 C  @5 k; ^
        (heat, new Selector (heat.getClass (), "updateLattice", false));
# q' `% _6 ]* Z. m; b+ f; W    } catch (Exception e) {) b" }; R! q8 k- V1 Z/ N# p4 k- W
      System.err.println("Exception updateLattice: " + e.getMessage ());& d; T7 y2 Y# `. H6 F$ c- b
    }
6 L1 _# m; o, K4 z6 B7 |        
% Q6 b: b0 O& i" \7 a    // Then we create a schedule that executes the& U) e/ |7 c5 V& G/ r4 ~, G
    // modelActions. modelActions is an ActionGroup, by itself it
" q) H* o9 A. v    // has no notion of time. In order to have it executed in! {- F+ C: c4 y9 A2 S  O' m3 Z
    // time, we create a Schedule that says to use the* K7 x# m- |. U
    // modelActions ActionGroup at particular times.  This
0 a2 _: h3 v& [3 v7 {    // schedule has a repeat interval of 1, it will loop every' M+ n7 w# c" y5 B
    // time step.  The action is executed at time 0 relative to
( g8 P' P8 T1 ^$ |    // the beginning of the loop.- {$ p* T9 n5 Y

9 e! I: v3 f6 M, X2 k    // This is a simple schedule, with only one action that is
4 p) V$ p6 d- g' h  n0 o5 s* F    // just repeated every time. See jmousetrap for more; O+ P) `* s  w, W
    // complicated schedules.- J0 Z" Q& E( ~2 l, _1 l; Y
  , r# ~: l/ }  W; [) {
    modelSchedule = new ScheduleImpl (getZone (), 1);
+ [* M1 z$ G2 ]$ f) c% ^    modelSchedule.at$createAction (0, modelActions);; G2 O8 W* d# Y4 C
        0 C% M! f" P; P' C# i
    return this;+ b8 [! S9 V9 p( |% T; @
  }
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