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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:2 D/ A3 n" `/ V& G
1 X2 i6 Q$ b- D: x
public Object buildActions () {
. ~  i& H8 {' B+ j) S( h    super.buildActions();* h) f3 U  A6 i2 F/ D0 \- Y
   
! f8 d; p/ k1 a% S    // Create the list of simulation actions. We put these in% D9 [- s6 F9 U0 E3 O4 L. Y
    // an action group, because we want these actions to be8 S" Z1 h" S2 v3 ?+ c* e' T
    // executed in a specific order, but these steps should
* P* p1 S. ~3 ?0 \6 l  x1 ^& D  F    // take no (simulated) time. The M(foo) means "The message. g8 Z4 A9 Y1 @. k, L9 t
    // called <foo>". You can send a message To a particular1 z9 B' M2 }% Y' v! }
    // object, or ForEach object in a collection.; f7 s$ T- k+ @  r
        
8 D/ a% j' V& W2 y    // Note we update the heatspace in two phases: first run
* {* K! y, x* d9 r  D    // diffusion, then run "updateWorld" to actually enact the" ]. i( Z+ `. b; h& p& w+ A5 m
    // changes the heatbugs have made. The ordering here is/ M! E8 V5 B1 t
    // significant!
3 X& F, z4 `. d3 W: n& W% x7 P        
: Q) e* t1 ^' q  ]4 Z' s8 e$ T$ r    // Note also, that with the additional
) n. e2 v& f' A  L7 k1 A7 t    // `randomizeHeatbugUpdateOrder' Boolean flag we can
& C* \, V8 N" u! ?' k% w    // randomize the order in which the bugs actually run$ g0 P8 u' z. c- v
    // their step rule.  This has the effect of removing any
6 `! a3 T! U# n9 m0 g    // systematic bias in the iteration throught the heatbug
: e* M+ W4 e! S. {7 W0 c    // list from timestep to timestep$ s$ v0 b9 b0 h- ?
        # T+ u6 l( b+ N7 q; v3 T& Y9 X
    // By default, all `createActionForEach' modelActions have# V4 A) ^. t4 H9 v% N
    // a default order of `Sequential', which means that the$ w4 k" e. j- J1 N9 |) w5 D0 F
    // order of iteration through the `heatbugList' will be$ X" h: M! k) k; Q& r/ F/ p7 l
    // identical (assuming the list order is not changed$ k$ A6 n# g" w/ y5 x3 G
    // indirectly by some other process).
8 }2 v0 j9 Q; O4 J+ k. q8 F! a+ n    - _6 r  `" F6 p: X' C
    modelActions = new ActionGroupImpl (getZone ());# m! t( \/ |- C* `8 @% t

  s; y* ?" z( C  e  a% b. s    try {6 l0 q9 N6 a5 K- G" q- H
      modelActions.createActionTo$message
4 q3 p! P! t8 o8 w- _  O        (heat, new Selector (heat.getClass (), "stepRule", false));# ?& w/ n. Z3 m  T1 a, f
    } catch (Exception e) {- m+ d0 B' r1 X% ^; M0 }
      System.err.println ("Exception stepRule: " + e.getMessage ());
2 a6 w+ ?6 e9 c: u( }- b. ^    }
3 D( C; y* u6 Q5 d  L( E5 r/ d/ }/ C6 n) L+ C( Z, Y- h. y
    try {
) I  z4 f; }9 m$ {$ O$ k  I1 ~      Heatbug proto = (Heatbug) heatbugList.get (0);8 J1 L6 Y4 b$ |: B* ]
      Selector sel = " x* ?' j' P0 s4 f
        new Selector (proto.getClass (), "heatbugStep", false);( r/ b8 b8 D7 H$ S; ?
      actionForEach =
+ _$ `" X3 m5 ^% `& x! v0 w8 A        modelActions.createFActionForEachHomogeneous$call' t2 X' N  F* R2 V5 w9 n: i, l
        (heatbugList,( z9 R8 W0 R) Q/ K! `/ q6 x# }% ?
         new FCallImpl (this, proto, sel,8 O& x1 P# J* l, E
                        new FArgumentsImpl (this, sel)));
" q" y* i; v: k. f& q( U  V9 W9 @    } catch (Exception e) {
! l* Z6 _* z5 w6 P7 ?0 S      e.printStackTrace (System.err);
1 l, Q! o' M3 v    }* Y' L% y, l6 C# {: q  X
    . o8 ]) S; l# |
    syncUpdateOrder ();
$ m8 j0 O+ c  N/ X# X8 R) J6 v( y
, [9 g' z4 t% b" _. `6 S( w    try {* z7 ?  w6 B" l5 E
      modelActions.createActionTo$message ' m) V) y2 g( a$ Z4 b2 p
        (heat, new Selector (heat.getClass (), "updateLattice", false));
" @2 Z0 b$ g. l% I' Y    } catch (Exception e) {6 H& f4 h+ F4 e* j! C. r
      System.err.println("Exception updateLattice: " + e.getMessage ());" N4 V+ n8 N8 j3 E5 c
    }
' X- s/ S( M* A9 A/ x        " |% |2 `5 Q' V# n
    // Then we create a schedule that executes the
5 D9 O4 p, c2 b9 {6 D8 H0 e- n  {    // modelActions. modelActions is an ActionGroup, by itself it( N8 d/ D; k. ]! W5 e  d2 N  ~# q$ w7 O
    // has no notion of time. In order to have it executed in
* c/ Z* D  v9 D+ U    // time, we create a Schedule that says to use the
$ H$ {, l- ]' o1 R    // modelActions ActionGroup at particular times.  This  I  c5 H2 }9 O" e" c
    // schedule has a repeat interval of 1, it will loop every
7 F5 B& f5 b/ C4 K+ u    // time step.  The action is executed at time 0 relative to0 x8 ]  W) X7 Y: p
    // the beginning of the loop.
2 z5 {3 o3 c; i( B( K; d0 x% u4 H$ O, x8 R
    // This is a simple schedule, with only one action that is
- B0 L3 f& z) h    // just repeated every time. See jmousetrap for more
- r, \1 w5 v4 r2 @* A( R2 G- d    // complicated schedules.2 B! R6 Y9 Y  w3 S  }$ t$ H
  
6 l) e* F. {) H, H    modelSchedule = new ScheduleImpl (getZone (), 1);
: J5 m6 l1 V7 K# x    modelSchedule.at$createAction (0, modelActions);
  v' p3 U  s) f5 r" `4 z8 j        ! x6 d2 P2 T3 a! d, i( [2 x
    return this;
- x9 w# {2 X, ?, g* y! Y8 d; w2 w  }
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