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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:  J, l7 D' `+ f( m  F) A

4 q. m! E  p, T) \7 U6 h( d& z public Object buildActions () {1 P* v+ R; X5 ~
    super.buildActions();
2 t$ V# k; G' }3 k  }6 K      m8 K9 g$ |* w+ T: C) D
    // Create the list of simulation actions. We put these in  Z) X$ @) n5 u: M
    // an action group, because we want these actions to be+ N" R/ e7 F+ \0 W2 c, {& b5 L2 B
    // executed in a specific order, but these steps should. }( ~2 }& V- x- L& M9 P
    // take no (simulated) time. The M(foo) means "The message9 {$ C: x5 Y4 }5 I# `9 l4 i" H
    // called <foo>". You can send a message To a particular9 ^. `$ H* v. J" M! @* a" ^/ M
    // object, or ForEach object in a collection.8 _: w8 m* }- S( S! x& k
        / _+ m% [( y: E5 I/ b. P
    // Note we update the heatspace in two phases: first run& t6 n; m3 t2 ]' b' E
    // diffusion, then run "updateWorld" to actually enact the& q6 I8 Y4 }& Z, X
    // changes the heatbugs have made. The ordering here is) J/ J3 b8 v9 n5 y
    // significant!! j. Y- L3 G/ H/ h5 o7 e  |! F
        ) f; m% O: h& j* J, m
    // Note also, that with the additional/ Y, v- _2 f. `, N
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
% F9 R* ~1 I$ S* \' _& {    // randomize the order in which the bugs actually run
" D5 q2 N) @$ W. _! P; _    // their step rule.  This has the effect of removing any
- h2 f) u. O" ]9 g) {% s    // systematic bias in the iteration throught the heatbug& S- B; Q+ Y2 u. R2 m  q
    // list from timestep to timestep
8 ~* t+ x7 k2 o2 m        - A6 u+ P  e+ V; u2 \: H
    // By default, all `createActionForEach' modelActions have
; y) M- X/ D2 R- S0 v+ ]& i: n/ F    // a default order of `Sequential', which means that the+ t1 _9 E2 v* T
    // order of iteration through the `heatbugList' will be
9 s" ^! i  P* N( N# q+ `$ _, Z' d    // identical (assuming the list order is not changed7 G5 i, U0 [; p  A& o$ A' N
    // indirectly by some other process)./ o9 w  A4 l, u, R
   
0 J8 H, p0 I+ h7 I5 G1 x! e* A3 h    modelActions = new ActionGroupImpl (getZone ());
5 }/ `( g3 i+ N2 z, ~' X
9 j2 Z' R, L: r" \0 R) p1 [/ t$ A7 Z    try {7 l1 L  l4 m$ r( n  C1 z
      modelActions.createActionTo$message. n- s* @3 |* b5 q; P
        (heat, new Selector (heat.getClass (), "stepRule", false));+ Z$ `0 n0 o( h% m7 {4 M! M6 j6 W
    } catch (Exception e) {
" ]3 W. d) Q7 N- g; m& c      System.err.println ("Exception stepRule: " + e.getMessage ());) Z3 S" ~0 \6 Q( ]+ d$ M" p
    }
( _. `0 t! v% ]! a5 _1 t4 k) U, D" l& U. {( [& J8 ~6 y
    try {1 f1 o  y5 b3 i* F/ e" G8 j' W( @
      Heatbug proto = (Heatbug) heatbugList.get (0);: w' x/ _/ r1 Q1 c, h/ `7 l- `9 M
      Selector sel =
: i2 H: G7 q5 u$ X( r$ S        new Selector (proto.getClass (), "heatbugStep", false);
1 v, ]; Q9 Z. I( Q3 N8 @) c/ g      actionForEach =
' g" c$ J' d8 j# A1 L4 Q3 }        modelActions.createFActionForEachHomogeneous$call+ M: i! y- O# Y- u% j
        (heatbugList,
1 ]  \! c" g/ q4 I, ^( e& W  j         new FCallImpl (this, proto, sel,
: \7 ]& A* H0 i6 w. m( ], E, r& k                        new FArgumentsImpl (this, sel)));' C% e% [, ]9 p( J: T
    } catch (Exception e) {
8 s- t7 o/ h8 V+ a      e.printStackTrace (System.err);, C6 {5 s4 R1 g
    }3 p& v5 ?9 \* F4 @4 {
   
9 e4 A# L4 \5 C8 C) G- O: M2 }# Q    syncUpdateOrder ();" _9 _0 a0 M/ y3 f4 N0 N
+ H1 {5 x) h: Z. t) e+ f; E$ t0 ]0 B
    try {# ?( m* a, G2 T- v
      modelActions.createActionTo$message
7 q. |9 _& X+ G        (heat, new Selector (heat.getClass (), "updateLattice", false));9 S" Z. N' |# {
    } catch (Exception e) {
7 U) p' t( P' p# {( p      System.err.println("Exception updateLattice: " + e.getMessage ());) C/ P4 b- o0 f% N8 b: ?4 K
    }
/ ?  ~6 A0 B( p/ s3 O. `        
3 {; Q$ q8 w( A! Q, _  {+ q/ b    // Then we create a schedule that executes the
1 a/ A; A: z" b    // modelActions. modelActions is an ActionGroup, by itself it
3 v5 y6 ~0 z0 J; z1 V( e4 z    // has no notion of time. In order to have it executed in
8 G  W# c( ~2 Q7 `    // time, we create a Schedule that says to use the
' l+ W% c' n% v5 J2 c    // modelActions ActionGroup at particular times.  This
; q0 w' t' ^6 n* t8 y; a    // schedule has a repeat interval of 1, it will loop every, R  ]. p- s6 p8 q# F; X8 g
    // time step.  The action is executed at time 0 relative to
5 x% V; n( l( C# h+ {    // the beginning of the loop.
  Q8 w0 [, z7 x" A1 \1 U
: Y* ?, n$ ~6 ]    // This is a simple schedule, with only one action that is
! P, t. T0 x% z3 q    // just repeated every time. See jmousetrap for more
. ]' E/ w1 q6 L# H5 Y    // complicated schedules.7 h$ ~, {) T6 S
  
* N& @+ u. d+ ?+ }8 I) E$ K    modelSchedule = new ScheduleImpl (getZone (), 1);
2 @1 m6 ^4 ]9 \* K2 X* B    modelSchedule.at$createAction (0, modelActions);3 [' @3 s+ E% X
        
5 M" l( A$ I- X6 H, L; r    return this;
" K; w) }( T% k7 ]% y. t7 l  }
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