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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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- u4 k3 l+ e4 N% a5 k4 f' x) X# X, ^ public Object buildActions () {  z9 h# `; v5 W: W
    super.buildActions();  B# d9 C2 B( C
    4 i  z4 @3 n: w6 {6 \
    // Create the list of simulation actions. We put these in
1 W; \$ p+ V5 _3 ?+ y    // an action group, because we want these actions to be
) _( P2 g$ z0 I$ U- q1 N    // executed in a specific order, but these steps should! y; \3 q& J5 L/ l
    // take no (simulated) time. The M(foo) means "The message
4 x1 G) Q# }' w, r    // called <foo>". You can send a message To a particular
, P$ r: _% P) f9 u    // object, or ForEach object in a collection.& G" _+ A0 x! r& C" a
        ' ?" L- m2 ?4 N
    // Note we update the heatspace in two phases: first run
. w$ I( j0 a( K% V    // diffusion, then run "updateWorld" to actually enact the
3 L% Q" P& m/ j* V" l4 I* w% p: f    // changes the heatbugs have made. The ordering here is
3 C# W& c0 Y/ K# [& x5 |    // significant!/ t. q& |6 ^6 a( m; s# Z) {
          N( \0 [7 k/ L+ q3 e* l; ?
    // Note also, that with the additional
% M( g( {# x7 s- d! S    // `randomizeHeatbugUpdateOrder' Boolean flag we can
1 }4 J( M3 @# t    // randomize the order in which the bugs actually run
- P! N. x7 G/ }    // their step rule.  This has the effect of removing any$ c' r; u0 Y9 B) Z& o
    // systematic bias in the iteration throught the heatbug$ G+ a! W) C- e; l% }
    // list from timestep to timestep
- \( o& q2 ~2 B' o1 q        
; C. Q! E5 I7 ]* J    // By default, all `createActionForEach' modelActions have
/ G. v; g$ J+ B3 _/ \    // a default order of `Sequential', which means that the/ B. \! G' @- d7 C# ]1 Q
    // order of iteration through the `heatbugList' will be& m9 I" `7 p/ j& s. O4 ~! n$ k4 A
    // identical (assuming the list order is not changed
3 Q2 [( q* t  C    // indirectly by some other process).. H0 z2 e! |" F' a+ U3 D" {
   
% C. e2 k6 {1 _5 z* f: E    modelActions = new ActionGroupImpl (getZone ());) Q3 \" C( K6 K- g

, D8 g' S0 Y" X* }3 Z: z    try {4 A0 C5 U) Q# C( q4 F6 _
      modelActions.createActionTo$message
" N/ F: e4 `+ r2 y" q        (heat, new Selector (heat.getClass (), "stepRule", false));1 F  `- K9 _3 R7 i  R
    } catch (Exception e) {
! e. W/ v& f' ]7 X% ^      System.err.println ("Exception stepRule: " + e.getMessage ());
2 o8 R, Q  `9 B# `. a    }
1 O1 ]  R7 t9 |  c9 U0 l) F( C2 [0 M1 {$ V2 L
    try {- p. D! z0 ?) }6 d) {  P
      Heatbug proto = (Heatbug) heatbugList.get (0);0 p! R: o- I1 Q) i/ w* d) M& _
      Selector sel =
# H* d4 C& M7 f        new Selector (proto.getClass (), "heatbugStep", false);
+ g7 o+ ?+ p- \! L      actionForEach =9 l2 c# I( e. C2 Z
        modelActions.createFActionForEachHomogeneous$call
# D7 i8 T3 [" L5 Z, P/ O        (heatbugList,
8 n3 ^. J+ e2 ?         new FCallImpl (this, proto, sel,. l; ?& L, }5 o- a3 u3 @# e
                        new FArgumentsImpl (this, sel)));; j. E- F  L( R, N$ N' l( W
    } catch (Exception e) {+ g% b$ x" i) Y: w# o
      e.printStackTrace (System.err);
2 h2 `+ @  y' |2 E4 V1 a    }$ ~3 J9 _4 v, H9 r- C
   
2 h' r0 _! Y4 E& o    syncUpdateOrder ();
8 R: e* U' _' Y+ `6 p/ w# |- [0 g* B
    try {, H3 w1 m7 `/ [( p, v* K: x
      modelActions.createActionTo$message ; A2 R& y, c0 w" ^2 J
        (heat, new Selector (heat.getClass (), "updateLattice", false));
" E5 T6 C2 v* S4 @    } catch (Exception e) {
; r5 e! S) z: r- }2 Z. L      System.err.println("Exception updateLattice: " + e.getMessage ());5 Y( B, Q. y4 a! d. ?
    }. T/ `- H3 F& x5 d( D3 U2 e
        " l& \& T2 B4 g  J
    // Then we create a schedule that executes the
6 K- H- Y$ {) L/ p" [( N    // modelActions. modelActions is an ActionGroup, by itself it- N2 }* _1 m% y/ r( {
    // has no notion of time. In order to have it executed in; g3 i& `1 @5 r
    // time, we create a Schedule that says to use the
$ C( g4 c/ H& h    // modelActions ActionGroup at particular times.  This/ x& n4 g. l6 \& n9 K
    // schedule has a repeat interval of 1, it will loop every/ q( \  Y* N9 K, r0 a$ ^# ^6 B# ~4 G
    // time step.  The action is executed at time 0 relative to
9 X: j2 J2 ?+ }3 B0 w( j5 V    // the beginning of the loop.( {( B5 q% S4 q, {  }8 ~$ }9 s6 a% {
: P. i: ], i2 U6 ?! o- }
    // This is a simple schedule, with only one action that is
7 |3 G# r7 C9 A4 Q" l% p* X    // just repeated every time. See jmousetrap for more+ _! N. f/ k% o( Z8 W( G
    // complicated schedules.; w  ]0 q' N# c8 h2 H( G( W/ _: D
  
  D* V! _1 b! d4 @2 _    modelSchedule = new ScheduleImpl (getZone (), 1);
; f$ w& M  S! S+ C" P1 ]: h* g    modelSchedule.at$createAction (0, modelActions);
! S8 p7 z6 q. n5 F; j6 W( [        - s5 T' ~' Z: z" s! n- H1 {4 @
    return this;* b- E: [. _) Y8 L
  }
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