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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:
( q( h! r3 j! @- U' i5 d0 p, u
( b; s" d' e, X; h) k public Object buildActions () {' ^6 D; B- X: C/ F
    super.buildActions();) G" R9 c. O: M1 c8 E
    $ Z4 d5 ]3 y1 ]. ], X' F
    // Create the list of simulation actions. We put these in2 Q, C5 C1 I. {3 j; C6 T2 \3 c9 K- u% W
    // an action group, because we want these actions to be6 G. ^& s+ h0 X- m- A: a( [
    // executed in a specific order, but these steps should
7 D1 L+ y& @" {$ s/ N+ `    // take no (simulated) time. The M(foo) means "The message
) O0 p* o6 Q5 P" t4 h    // called <foo>". You can send a message To a particular5 z% Q: j  H, e2 y) p6 j- J# k
    // object, or ForEach object in a collection.6 r9 Z& V1 M& o/ J; h' u4 c
        
0 z+ |4 z% c* R. c1 S    // Note we update the heatspace in two phases: first run! J7 m5 f, Q5 v: A
    // diffusion, then run "updateWorld" to actually enact the3 L/ \* Q0 h5 Q& D0 V/ w
    // changes the heatbugs have made. The ordering here is
5 L1 o% y# w  l1 b4 a7 a2 Y# z    // significant!
& K) o5 B, f6 ^2 K        
; u# t! c! n1 w( ^2 k    // Note also, that with the additional2 p1 i1 _9 B8 ^/ S0 l
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
0 ~2 _( x' ?2 Q5 O    // randomize the order in which the bugs actually run: w  X* i4 f5 ?. e; g# ~# B% Q
    // their step rule.  This has the effect of removing any, L# ]* ^8 z0 k' U& x
    // systematic bias in the iteration throught the heatbug6 h' v- _3 I( A0 g2 b5 O( f8 J
    // list from timestep to timestep
+ c* P, d  r6 m" u4 t& E, k        
2 _5 {+ Z$ ]& W( D, T, ]    // By default, all `createActionForEach' modelActions have
% G4 I/ s. Z9 p* J    // a default order of `Sequential', which means that the# D- f: Z9 a9 G  C
    // order of iteration through the `heatbugList' will be
' R, u6 r8 H3 J4 Q. ?, q( l8 P    // identical (assuming the list order is not changed; d4 k1 P5 c! g3 D. {* d& P
    // indirectly by some other process).: T  e/ n; ?: t9 b
    ( H2 d5 @: o8 k. l. G
    modelActions = new ActionGroupImpl (getZone ());
6 h# D; [9 X$ N: H4 I
. h, d; Z* z8 b. U7 f    try {. M- r! {/ x: K; c
      modelActions.createActionTo$message: O0 S: v2 x: l7 x1 E
        (heat, new Selector (heat.getClass (), "stepRule", false));
- f5 K! r0 |  Z9 @6 l4 ?; V    } catch (Exception e) {! Z* @3 u) b( G. u
      System.err.println ("Exception stepRule: " + e.getMessage ());/ r4 D2 k& Z4 v' q- m. s% h
    }
- l0 X% {2 Q8 ]% H4 K
; t# }) A0 ~! S* k. ^' g* L, ~    try {
" F# k) F% n! z      Heatbug proto = (Heatbug) heatbugList.get (0);! s: u6 K2 u+ x8 |1 E' P4 V4 |3 M
      Selector sel = 1 d' e- c5 {7 u* }+ l2 S+ y
        new Selector (proto.getClass (), "heatbugStep", false);
/ d  Z& I2 L6 z6 r: V: g  P, g      actionForEach =5 q4 P, X9 P0 F; U0 b; t* K2 n7 L
        modelActions.createFActionForEachHomogeneous$call- \( [: f# x8 O  v: M( M4 K% t
        (heatbugList,
) n3 P6 _' W( J" f# {         new FCallImpl (this, proto, sel,
6 {  S- o9 ~: s- ^2 L                        new FArgumentsImpl (this, sel)));% K7 T' S7 f9 \. ], v9 a
    } catch (Exception e) {
1 }" e/ _9 |7 m+ P      e.printStackTrace (System.err);
' z; c, r- |2 C" b    }
6 U+ M/ i5 N2 n+ r9 D) s+ Q    7 }1 b( i4 g; U
    syncUpdateOrder ();
# \' u+ Y, U, \5 @5 @
; r2 \2 d- h/ u    try {- [, J' Q4 _# _; p  q/ O( C: q
      modelActions.createActionTo$message
* U) m0 h% s* O' o        (heat, new Selector (heat.getClass (), "updateLattice", false));: L, E% r; O# h% F9 G
    } catch (Exception e) {, }" X! [5 B" ]) A5 S- u. M/ C! ?
      System.err.println("Exception updateLattice: " + e.getMessage ());
, p0 Y1 R4 x, d. u; u) c    }9 J+ p/ k' I( R' Z
        + v4 e0 I' W6 p  q7 y: R# ?  P
    // Then we create a schedule that executes the
* o2 Y- e2 z5 I% `    // modelActions. modelActions is an ActionGroup, by itself it
! [) S! f7 t, O; _    // has no notion of time. In order to have it executed in" t7 H) L' h4 R8 }# Q9 I3 K
    // time, we create a Schedule that says to use the9 `( ?) \( g/ }- o& w
    // modelActions ActionGroup at particular times.  This) n+ z! D& }" r# o$ _: V* C
    // schedule has a repeat interval of 1, it will loop every
0 X( k4 J, O5 v5 L; U5 g5 @    // time step.  The action is executed at time 0 relative to
. k/ g8 g  j4 U% E' T9 W    // the beginning of the loop.
3 a3 M, ]0 i, X$ Q; g9 n, Q; p' u: C. P1 V' y" e0 E* f2 d9 b0 X( f% T
    // This is a simple schedule, with only one action that is
8 m7 @: Q4 T  H0 X    // just repeated every time. See jmousetrap for more
' f- E. J" S; x8 E1 }$ G$ F; q8 C2 F    // complicated schedules., u. p9 a' \, c
  1 W6 n4 e9 |4 t; G% e
    modelSchedule = new ScheduleImpl (getZone (), 1);: S' O' k0 {6 f- K# F7 a
    modelSchedule.at$createAction (0, modelActions);% {0 d: K+ Y" h% X2 g
        
' _# a" Q- ]# @( c    return this;7 H# K; y9 p1 E
  }
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