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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* H. x$ [" ^: I
2 s6 x5 y% m! |6 q public Object buildActions () {
' m1 r1 t8 Y# y) L    super.buildActions();# Z! n) e+ U2 S# ^  {7 h2 ]
    : n: D9 U; _' p: ^5 v- z
    // Create the list of simulation actions. We put these in; l% S; B* _2 q9 \  S3 ^
    // an action group, because we want these actions to be, H5 k7 I) T+ P. x; K
    // executed in a specific order, but these steps should
1 j1 T# |8 y3 w8 t3 ^    // take no (simulated) time. The M(foo) means "The message' t& j! R/ Q# W/ C4 U
    // called <foo>". You can send a message To a particular
0 |( \8 |) `+ U2 N6 d3 ?* K    // object, or ForEach object in a collection.
0 M( Z- i; E: P+ p. Q; c4 T        & w6 U+ z6 a9 N- t# N) V
    // Note we update the heatspace in two phases: first run
$ q- z' d5 |* `$ i" G* B; A; V1 m3 a    // diffusion, then run "updateWorld" to actually enact the
3 Q# a( h' j2 r    // changes the heatbugs have made. The ordering here is
5 S) X* w' H' S& F    // significant!# o: X# ~, W( G4 `
        
- N! Y( d+ c2 U6 I    // Note also, that with the additional$ S3 X" }, M8 E
    // `randomizeHeatbugUpdateOrder' Boolean flag we can( T0 a9 v1 w0 x9 N3 O' m. B
    // randomize the order in which the bugs actually run
; i& Y, B6 q4 c8 `: ]    // their step rule.  This has the effect of removing any
  a8 ^( y5 E$ J7 W    // systematic bias in the iteration throught the heatbug2 i" C+ Q. Y+ Q# ]2 H  F
    // list from timestep to timestep
0 e1 r! W) ^3 b( O  t        7 G7 G9 _& ~& I5 E( R  k+ y( {+ R
    // By default, all `createActionForEach' modelActions have4 w; l0 \# m/ b# v+ W$ w3 b
    // a default order of `Sequential', which means that the
' o' W% B2 ?  V8 x# w    // order of iteration through the `heatbugList' will be$ d1 k" q- K% s# |4 p$ O
    // identical (assuming the list order is not changed
% Q; T& L% U- p3 F    // indirectly by some other process).
. a( K* Y8 v+ R4 \: g; _   
9 s9 ^; {* j) Q" W- c+ I* v    modelActions = new ActionGroupImpl (getZone ());4 R9 U4 ^  ]* H* d' e

0 y/ V, I& J& r, n6 p2 B. y& y    try {
0 Y! H8 E7 k+ m5 C9 ^( N+ t      modelActions.createActionTo$message- V$ A1 ~/ V4 J, S& p
        (heat, new Selector (heat.getClass (), "stepRule", false));
8 F- }) k# I' o    } catch (Exception e) {$ G/ J5 ]! d/ O' E3 b% N! w! D
      System.err.println ("Exception stepRule: " + e.getMessage ());* J% z  y' s( r; C4 U
    }+ ~7 c" ?+ F/ P( ~0 P" \$ Z

  t( i! W# I3 r8 ]1 O/ d    try {5 v' u$ W: @9 X" p; W" W
      Heatbug proto = (Heatbug) heatbugList.get (0);- z8 {/ {5 o2 V
      Selector sel =
  `( o; ~! X$ I. d% m" }        new Selector (proto.getClass (), "heatbugStep", false);3 [/ [: B- Z! z; S3 [# Z
      actionForEach =- e3 T& s9 ?" d0 _) y
        modelActions.createFActionForEachHomogeneous$call2 t$ M! v& A! L0 I8 J
        (heatbugList,; b; \1 E' {0 R; }
         new FCallImpl (this, proto, sel,5 y7 F1 q$ c% S, y/ _9 z
                        new FArgumentsImpl (this, sel)));+ h  r" L! d5 p' N( `9 U
    } catch (Exception e) {8 k. F( l8 b- |9 i
      e.printStackTrace (System.err);0 D0 O. D4 e% ~: }& a7 h! ]( j, B
    }" e$ \' D7 A( L2 k7 G* ~& l; w7 q
    7 b0 V# a7 L# f6 d6 o
    syncUpdateOrder ();
6 {$ s6 X# {, ~. u6 u5 L- v( w  s( a* R3 t' B0 B! K
    try {
% c  @0 r3 H% ^$ u8 H: [- K; X1 C      modelActions.createActionTo$message
$ x' @! h! Y) h$ `, f+ B# Z        (heat, new Selector (heat.getClass (), "updateLattice", false));
8 u7 ^7 T$ E  |    } catch (Exception e) {; M" |- i# q  J7 t, I# j, R- ?
      System.err.println("Exception updateLattice: " + e.getMessage ());" B# q4 b( t+ i  q6 L  \4 I8 `
    }9 t$ ^+ Z, G% ^( i8 c
        
% F# q6 N. Z$ A9 O6 N4 ]1 Z    // Then we create a schedule that executes the
- d& F5 @7 b; m! N$ K8 h5 P    // modelActions. modelActions is an ActionGroup, by itself it
( M, g2 l! t% ?  o2 _! [    // has no notion of time. In order to have it executed in
0 m5 w% k; i/ x5 M1 S7 M1 e' K4 o    // time, we create a Schedule that says to use the
0 t- z3 b7 T! n( M    // modelActions ActionGroup at particular times.  This# ]5 U) [, A: |/ p/ k
    // schedule has a repeat interval of 1, it will loop every8 T. X" r; u- A5 h% T, h7 D/ @
    // time step.  The action is executed at time 0 relative to5 ?* j# ]) z0 d1 I
    // the beginning of the loop.
- V% f& j1 ~' q: F) p
5 Z3 U4 i* b8 X' |+ P$ d' E    // This is a simple schedule, with only one action that is
8 C/ s, ]6 \/ B. |$ G; ~( @3 p    // just repeated every time. See jmousetrap for more7 Y; K# W5 [6 _) Z! o* O: e
    // complicated schedules.0 I1 f, e- N3 ~0 n0 e7 b1 Y* e& o
  
0 j# j6 H4 a& X& K" U    modelSchedule = new ScheduleImpl (getZone (), 1);3 C' j- C' c% g9 n& r
    modelSchedule.at$createAction (0, modelActions);+ D+ r% e* U6 C1 `
        1 K9 x6 c2 Q; p3 V+ q2 \' ]
    return this;
# ^) z1 j5 n# o' z/ K+ R  }
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