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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 () {, ~* b' w& n0 h3 `+ P
    super.buildActions();
8 v: y7 Y3 I: j1 V4 y6 F: l    9 \8 |$ x' m) o- r# ]4 O" N
    // Create the list of simulation actions. We put these in( j) b9 `7 f& W( @  Z2 w
    // an action group, because we want these actions to be- N( I( H  P0 p* l+ a2 E
    // executed in a specific order, but these steps should
; |( T2 J' g/ z    // take no (simulated) time. The M(foo) means "The message
2 @: S6 [8 p+ x; h3 t/ W0 V* Z    // called <foo>". You can send a message To a particular. A  a, H! j" i3 U; `. x6 ]
    // object, or ForEach object in a collection.* f7 W& T) C8 A
        4 I- g! H; G4 Y9 {2 ~2 i
    // Note we update the heatspace in two phases: first run/ n% m& J. k8 t5 G5 e1 C6 O
    // diffusion, then run "updateWorld" to actually enact the3 z' W6 J6 r( X, _5 q7 ^, ?6 e
    // changes the heatbugs have made. The ordering here is4 w1 x2 j+ r" b0 N+ B7 a
    // significant!
3 E7 F7 e; M( T; X3 b        1 X& M* q5 Q' u2 u/ ~
    // Note also, that with the additional
# r. Z) {: L8 d  R# d2 Y, k    // `randomizeHeatbugUpdateOrder' Boolean flag we can' I1 x9 H" Z- X$ G. p8 u6 u
    // randomize the order in which the bugs actually run
+ G8 ]) E$ G& B: ?    // their step rule.  This has the effect of removing any& Y8 c8 c+ @& C, b+ f$ U
    // systematic bias in the iteration throught the heatbug/ c4 u1 W! _5 ]4 q  q
    // list from timestep to timestep( _; J- c/ S, `; d$ ]) o! q1 z' t5 U
        
( A4 X5 N8 Q) E4 C# f    // By default, all `createActionForEach' modelActions have
" @8 g9 S0 r+ |: j- C7 B    // a default order of `Sequential', which means that the
2 x9 r6 J6 {: r9 A9 z9 R7 |    // order of iteration through the `heatbugList' will be
) t4 k* I- |- P/ N: ~/ t3 y    // identical (assuming the list order is not changed5 R1 }# G0 y! J4 y+ P  g
    // indirectly by some other process).2 C. A( c3 X2 k% n+ \
   
- {' e7 O8 x. d  k    modelActions = new ActionGroupImpl (getZone ());
# U+ y# {  P5 f9 G+ o* n
& G; m0 D# J' g  F8 B    try {* k/ S9 t5 s; p+ q1 B3 ~
      modelActions.createActionTo$message
1 M. N& U9 j, ]# U( Y        (heat, new Selector (heat.getClass (), "stepRule", false));) N1 ]! X. L+ ]7 S
    } catch (Exception e) {7 U+ L* q7 _  s
      System.err.println ("Exception stepRule: " + e.getMessage ());$ K; M  F, z( S) I+ m4 Q8 G
    }/ x' S) Z5 s# }1 I' L+ a1 t7 ]5 Y5 Y

+ |6 q" r/ I) y# h5 p& A; A/ {    try {
& ?. b. W, w/ Z$ \0 [/ X4 `; x+ B! }( L      Heatbug proto = (Heatbug) heatbugList.get (0);8 M4 O- L3 C+ `$ `5 T5 X+ w
      Selector sel =
, i9 d8 }/ S# c0 G% i        new Selector (proto.getClass (), "heatbugStep", false);
0 F8 h% d7 c; U* B" i, V      actionForEach =
$ Y- `0 |/ N4 h% Q  g) J3 `) {. ^        modelActions.createFActionForEachHomogeneous$call- s: b* i+ d6 r- Y8 @
        (heatbugList,8 O  U# \' g% Q9 d( d; {+ F
         new FCallImpl (this, proto, sel,, h' K* f: v1 Q4 j4 {5 |
                        new FArgumentsImpl (this, sel)));
0 n( H6 y4 p0 [8 H+ e: m7 A8 @    } catch (Exception e) {, k0 c7 a. Q2 W: J/ [/ M) n
      e.printStackTrace (System.err);
4 |2 r$ {9 e. B! e; p( w4 I    }
+ E& q8 S3 ?; b5 J* \   
4 q' {8 d. ?. J/ j7 I( u    syncUpdateOrder ();
6 m, E9 g8 I+ v" f% d# F- t) b, n' W
    try {
( L8 v6 [8 L+ ]; w      modelActions.createActionTo$message
8 _% i5 n$ D4 B2 F6 ~( T1 |; O        (heat, new Selector (heat.getClass (), "updateLattice", false));
/ a* @% a7 v! q; M! M    } catch (Exception e) {4 k& Q1 v0 h% F; Z
      System.err.println("Exception updateLattice: " + e.getMessage ());
4 h6 L/ j$ S! V/ N5 ~    }
% R, _- r7 l. n) U3 k$ |        
6 `4 |; ~, K: V' N% q    // Then we create a schedule that executes the
4 u2 [2 s. r# ^6 @    // modelActions. modelActions is an ActionGroup, by itself it( g2 {9 r# F' G& J
    // has no notion of time. In order to have it executed in
( }& q: _# Z9 k( U0 ]2 @7 v    // time, we create a Schedule that says to use the  Y$ J( |3 P, V/ N$ F5 [& d- [# l
    // modelActions ActionGroup at particular times.  This
2 X  K  y( k* n- l    // schedule has a repeat interval of 1, it will loop every+ [$ ^5 I+ }, F' ]& P( s
    // time step.  The action is executed at time 0 relative to2 [% B; J/ U" x& S  k7 D
    // the beginning of the loop.
; k# B. f3 V) A+ n2 F7 C' U5 X0 T  O
    // This is a simple schedule, with only one action that is" j: F4 `+ U( V& [: E6 D- k. Q2 |3 t
    // just repeated every time. See jmousetrap for more
6 b8 \8 L0 w! G" E; x. _    // complicated schedules.
0 ^" x. h8 h6 Z3 [. c" k- J/ E  ; J) Y) W2 w! Z5 L! ?7 [/ n7 p9 y
    modelSchedule = new ScheduleImpl (getZone (), 1);
* v7 p0 Y( `3 T' l; T    modelSchedule.at$createAction (0, modelActions);
8 x7 J0 r+ O  s/ D        
3 V$ e. z1 X& i! C0 C& B    return this;+ M2 K; i: _( N' `/ |5 t
  }
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