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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 () {5 j% X2 r' Q7 W
    super.buildActions();, y. E  F; S) o4 W2 }3 ~; u
    . M0 h$ h* L- V; W
    // Create the list of simulation actions. We put these in
, i* g8 H2 {+ U. b) _% d6 A    // an action group, because we want these actions to be) u. q- T/ Q7 H1 n' {
    // executed in a specific order, but these steps should
/ L* P$ f* U  H3 ?    // take no (simulated) time. The M(foo) means "The message0 _3 l1 W0 r( x
    // called <foo>". You can send a message To a particular; C0 L2 r3 n, z+ }/ V  A
    // object, or ForEach object in a collection.
& S5 U6 h' u' O+ J8 n" I        7 A5 @- p1 Q# Q9 o' A
    // Note we update the heatspace in two phases: first run
+ f4 F: J. f7 x! `  T$ ]% K/ {    // diffusion, then run "updateWorld" to actually enact the
7 B& s$ A, s$ X5 r6 K    // changes the heatbugs have made. The ordering here is4 _- C  Y( H) t& A- c/ |! q! D; D
    // significant!5 o8 z: }& t, n
        + a! y1 \  y. G5 J0 K
    // Note also, that with the additional
% T: e4 X) U6 L7 w, ?+ z    // `randomizeHeatbugUpdateOrder' Boolean flag we can7 |/ G8 R, T& V( ~: N
    // randomize the order in which the bugs actually run; p1 Q' S( B8 f. G4 |# W
    // their step rule.  This has the effect of removing any
; @8 |4 M; D0 Y    // systematic bias in the iteration throught the heatbug7 l; Y- z; L+ t0 U  l: Q$ q: J+ A6 T
    // list from timestep to timestep) _: U& |; h3 B1 n1 W. l, _
        
3 F+ `4 b7 C+ R+ s    // By default, all `createActionForEach' modelActions have* C( `& X1 q& w( \
    // a default order of `Sequential', which means that the
1 h9 a3 v( J( M    // order of iteration through the `heatbugList' will be
- w0 a# r; G; f% t0 ~. |    // identical (assuming the list order is not changed
* p5 d- u  w. Z    // indirectly by some other process).
# e: E! e; e0 n    8 S$ J8 ~' w. b! _, }& @  X8 X
    modelActions = new ActionGroupImpl (getZone ());  \. t" j( k( `$ p* J
( v9 e" M3 E+ I/ b& ^3 O& d# }9 ], H
    try {. B2 q8 d( i0 R* \
      modelActions.createActionTo$message" V7 w8 c7 O7 M7 ]+ g8 h
        (heat, new Selector (heat.getClass (), "stepRule", false));
/ ]% a& q6 I$ Q+ }    } catch (Exception e) {
3 B: z$ M2 P. @0 z& Y; f      System.err.println ("Exception stepRule: " + e.getMessage ());
8 U8 {  e  ~, e; S9 [* i3 d, D    }: g: p4 Y9 l" a: e+ h2 s5 c* t4 N0 Q

* J  A# o- O3 ]" X. o' t1 g    try {
# p. t( h5 c' n( o* `. g      Heatbug proto = (Heatbug) heatbugList.get (0);
" h1 C) s9 T& G1 Y+ ]( t' @      Selector sel =
: T! W" ~& ]# {1 ]; j; S" K        new Selector (proto.getClass (), "heatbugStep", false);
# O' U% d" r2 P9 t7 Y+ Y8 y      actionForEach =/ b% N9 A- `/ ]% I/ \7 B
        modelActions.createFActionForEachHomogeneous$call2 j. a! r: ~- V" F1 E6 ~
        (heatbugList,& q" A2 n( D. g7 ?3 n7 }
         new FCallImpl (this, proto, sel,( _+ N( i- G- m) c( R4 A( v2 T
                        new FArgumentsImpl (this, sel)));
7 H/ g; j- L: S    } catch (Exception e) {' H8 ~5 N$ T, g- T! Z& ?7 O: W! B
      e.printStackTrace (System.err);
, s" X5 g/ u3 i; z+ p8 g    }
) G  t$ \# x# k" d5 r& ^4 j$ X' S+ h2 O   
( N8 o/ |% ]- ^6 v" V% c    syncUpdateOrder ();
. L/ c8 d' C/ u9 m+ O0 x% ~  r; _, J3 N
  Y; p. _# g& c! g9 Z* C0 i    try {
9 y: Z8 X3 Q% j5 s5 Z      modelActions.createActionTo$message
: \  ]" D& ^' f2 Y6 R        (heat, new Selector (heat.getClass (), "updateLattice", false));7 g% W) o7 \1 Q; P, S' A2 V
    } catch (Exception e) {
5 v( Z7 p$ |/ B  c" N      System.err.println("Exception updateLattice: " + e.getMessage ());
; K, ^0 Z1 b! Y% s4 K$ h    }
: K4 Z( g9 K) P( z        2 z% L8 r" ]$ h5 X1 d0 I! d
    // Then we create a schedule that executes the
9 K/ a: P" z5 n. B    // modelActions. modelActions is an ActionGroup, by itself it
7 C) R7 _! C1 j, f    // has no notion of time. In order to have it executed in0 U3 V' {7 a! \
    // time, we create a Schedule that says to use the
1 m: g) {& o+ U3 J3 D& D    // modelActions ActionGroup at particular times.  This
) g9 y3 q4 b) `. K    // schedule has a repeat interval of 1, it will loop every( K5 Q$ B$ w1 R, |3 Y
    // time step.  The action is executed at time 0 relative to8 R' |9 ~* V0 i+ y' ~$ z& L* M
    // the beginning of the loop.5 |3 j6 T& k$ q" ^: q

0 F6 i: U6 u3 M, F$ t5 E    // This is a simple schedule, with only one action that is, S2 p- p  y+ x3 C% f
    // just repeated every time. See jmousetrap for more: G+ c: S) N" ]8 c4 w8 a2 q
    // complicated schedules., c% p- ?' J' B4 C
  * j: d/ `( l2 M, ^
    modelSchedule = new ScheduleImpl (getZone (), 1);
7 Y8 s: N" i# }0 o- E3 \% y    modelSchedule.at$createAction (0, modelActions);
9 S0 A( v6 I4 ~  E' \) h* h        
9 U0 e) `: G! @0 A; `( h    return this;( G2 |: z/ A) G. G" B" g2 n0 R
  }
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