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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 () {& O, A6 _# ~. K/ M
    super.buildActions();
; K; E7 j$ ?0 ]    5 H( m) C/ P% q
    // Create the list of simulation actions. We put these in
8 G. y: W4 Y0 I7 r    // an action group, because we want these actions to be
5 g2 B! y9 U7 T9 c- E1 ]    // executed in a specific order, but these steps should
1 d9 C2 T$ U0 L, p4 z9 S, j# D    // take no (simulated) time. The M(foo) means "The message) @" K& p9 |8 b' c* i
    // called <foo>". You can send a message To a particular
. C9 N' [9 `$ p  C! b* [) K    // object, or ForEach object in a collection.% ]. U, K( E- J+ v) f1 F
        
3 }( m: J" A/ ^    // Note we update the heatspace in two phases: first run3 ~& M9 T% {7 D2 y' c( @# B3 n
    // diffusion, then run "updateWorld" to actually enact the
7 }  C, C4 F/ |9 m* a8 F    // changes the heatbugs have made. The ordering here is5 R- ]4 F2 [0 T/ q6 j$ `2 g4 J
    // significant!. U" W. X6 r) Q; s8 W% e3 g
        ( O9 n$ K8 T6 x. v' C
    // Note also, that with the additional+ v& o" u5 s) P# Y& k% N8 w
    // `randomizeHeatbugUpdateOrder' Boolean flag we can  P- A& x* G8 @8 }1 e/ j$ O
    // randomize the order in which the bugs actually run6 k5 W2 d! `' L. ?+ E
    // their step rule.  This has the effect of removing any
" g: s- X3 o  U/ ?" c    // systematic bias in the iteration throught the heatbug/ M- E/ m" `0 a
    // list from timestep to timestep
4 k" y; U3 n* Q6 t        
* h% E2 H1 p* z" X    // By default, all `createActionForEach' modelActions have
7 A2 q% c& z3 b" }, t7 D    // a default order of `Sequential', which means that the5 o7 k% u- E' T3 o+ n  x
    // order of iteration through the `heatbugList' will be
2 o/ t8 F% \; `" P0 I2 H. L    // identical (assuming the list order is not changed
/ ]! f: F! a5 Z  c    // indirectly by some other process).
+ S: Z% N# d  d2 Z/ t, s+ C8 p   
5 Z3 O( ~- b2 m" s, S- p5 ^    modelActions = new ActionGroupImpl (getZone ());
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    try {
( G9 q& e8 k1 x      modelActions.createActionTo$message! Y' L- ^' S+ V6 [0 L
        (heat, new Selector (heat.getClass (), "stepRule", false));3 Z9 w* I' p, E! ]
    } catch (Exception e) {- a6 Z2 n3 U9 C0 Y7 O
      System.err.println ("Exception stepRule: " + e.getMessage ());
' \8 z7 k/ @) {7 u1 X4 {5 N    }
4 Z7 {$ r; J$ v/ k+ m" p' j3 g6 A9 q, e
    try {+ b$ O+ a! K! G& t
      Heatbug proto = (Heatbug) heatbugList.get (0);
" h# D- }9 y% E1 j5 R' [. s' @      Selector sel = 6 ]$ r( @! E0 B) u
        new Selector (proto.getClass (), "heatbugStep", false);. a$ h. J8 ]) \$ m$ P
      actionForEach =
) o; z* C  _1 d        modelActions.createFActionForEachHomogeneous$call
" H- t6 j" q4 p. E8 w        (heatbugList,% ]) U/ a. G3 H
         new FCallImpl (this, proto, sel,
9 {. B" N  X, N$ ]- h  \9 G                        new FArgumentsImpl (this, sel)));" Y9 d) J8 x0 B3 v3 f1 y
    } catch (Exception e) {1 O" p0 O. d: V9 C1 A' o! M
      e.printStackTrace (System.err);3 Y& b" `8 w2 _% a9 {
    }
6 G; I4 K$ F, z) h* j# i   
- \2 j# Z' e9 {4 U4 V6 W% C    syncUpdateOrder ();
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    try {- e6 X2 E3 [' g* p
      modelActions.createActionTo$message
/ e+ [- d3 f2 f: {. p; N0 U& `        (heat, new Selector (heat.getClass (), "updateLattice", false));; b; I# t' X7 \5 ?
    } catch (Exception e) {
; j9 k* M* T, ]0 M7 z      System.err.println("Exception updateLattice: " + e.getMessage ());" `# B2 h( N* I% j# n
    }+ e. {# N2 u) q" t1 u
        
/ j/ N6 j  x* P. p' D' c. b    // Then we create a schedule that executes the
2 ~, }6 T; d, w9 ~* t    // modelActions. modelActions is an ActionGroup, by itself it
4 y/ \/ n6 V9 Y  b1 T' c6 F) `9 j    // has no notion of time. In order to have it executed in, O% F+ j: |' ?  A
    // time, we create a Schedule that says to use the
) a+ R2 T" f4 r  i  R: @& H: j    // modelActions ActionGroup at particular times.  This7 [  {1 u, d; x0 X$ h
    // schedule has a repeat interval of 1, it will loop every
6 g# M/ P0 J5 }5 C" m2 K: C    // time step.  The action is executed at time 0 relative to
  c5 e' G- Q. [* R    // the beginning of the loop.
, L+ n! }5 J& x$ m
5 ]+ ?0 C4 @& A    // This is a simple schedule, with only one action that is
6 Z9 X4 J5 K6 x- F    // just repeated every time. See jmousetrap for more
: e( H6 p; [0 X" \6 g    // complicated schedules.
! q% p  b$ v7 H8 p% k0 k  
/ B9 B% N1 n7 {/ Y: h) w    modelSchedule = new ScheduleImpl (getZone (), 1);
: ?5 a. \1 S: i$ F) B    modelSchedule.at$createAction (0, modelActions);) a8 [8 v/ d& Q; q+ P5 @
        . _% H: j! j' p
    return this;" M8 V6 N& H5 o
  }
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