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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:3 A$ s1 i  w( U7 x4 Z- m( O$ F

0 v5 A- H9 X- \' B% I3 S public Object buildActions () {) {1 g! j/ j7 o' e! H1 W
    super.buildActions();
8 s0 ^, `' C& t! E& s. w) n! u6 ~' S: a   
3 U' t: H2 w) P: y4 P    // Create the list of simulation actions. We put these in
+ ~( G. m9 @; ]0 F  J    // an action group, because we want these actions to be; Y6 k2 ~0 y# U' k- [: I) I
    // executed in a specific order, but these steps should6 e% O( [+ U2 t# ]/ m! A; R
    // take no (simulated) time. The M(foo) means "The message
8 C1 ^$ A7 r, g' T1 ~  z6 Z! F    // called <foo>". You can send a message To a particular
+ T0 Q- D! j6 R8 J    // object, or ForEach object in a collection.
) v1 z, l# H# c+ R3 x" }( I        
- Z8 k  j4 r+ u5 [6 Y, b- z    // Note we update the heatspace in two phases: first run! t/ I2 b" w# X/ D6 k
    // diffusion, then run "updateWorld" to actually enact the
5 ^/ l' }( b6 }, N    // changes the heatbugs have made. The ordering here is
9 [% ]! Y$ f; w5 S    // significant!9 Y8 q3 b# J7 f+ Q0 Z& _# F% n9 f
        
( f0 Q# t* c' y! w" I9 v  R7 S5 Q    // Note also, that with the additional
3 u: Q- i. O! c  ~5 Q/ G/ n    // `randomizeHeatbugUpdateOrder' Boolean flag we can2 z5 h1 _6 E# F$ E, h; g
    // randomize the order in which the bugs actually run
+ M0 I" L4 r: b( c+ l. T1 |, D    // their step rule.  This has the effect of removing any
3 M' @! B  P  K$ K2 X( m7 E) L8 R1 v    // systematic bias in the iteration throught the heatbug6 t# q, @# {# D9 X7 C( k8 Y
    // list from timestep to timestep7 u2 _- M& t# a! a; _3 D  t
        6 a6 j0 [) H, w* {
    // By default, all `createActionForEach' modelActions have
$ \  g' T! i3 z; }! P( f& [    // a default order of `Sequential', which means that the
7 ^. h+ y  ?) v" c9 N    // order of iteration through the `heatbugList' will be3 R6 g2 E$ z3 _9 s7 y
    // identical (assuming the list order is not changed
: v7 m' G, w( T$ Z0 u    // indirectly by some other process).
4 }% e! u/ A9 H2 [   
! G4 T$ j3 e$ P) [5 c    modelActions = new ActionGroupImpl (getZone ());5 w- t9 D; h7 g/ A3 S6 t
8 z7 p5 ~& F& U8 v4 k
    try {
6 U% l* j" H& M( Q) g4 X      modelActions.createActionTo$message
0 I: R. S2 i2 x1 B        (heat, new Selector (heat.getClass (), "stepRule", false));
0 o( n6 W, Z- ]+ p    } catch (Exception e) {% p0 C* G4 V$ p; ^$ N4 S+ g* ~
      System.err.println ("Exception stepRule: " + e.getMessage ());
+ t$ N$ i8 x) s5 t    }0 A1 ]/ U7 k; K! ^. r* z. `0 Y
7 \+ x: @1 G( t( T4 k+ J
    try {9 B& q: ^9 d6 M. Q+ s* I8 u
      Heatbug proto = (Heatbug) heatbugList.get (0);
; f  w! Y, p7 H6 {/ g      Selector sel =
9 A" y) @% n& M$ `        new Selector (proto.getClass (), "heatbugStep", false);
/ K4 q+ p) D; Y$ B0 _: U0 _      actionForEach =
2 C& N" m5 E! t; G) h; u        modelActions.createFActionForEachHomogeneous$call
* S( T3 L- ]! V. X        (heatbugList,
; _2 g( C7 X% X* t% }" n: Z         new FCallImpl (this, proto, sel,
! G4 c! c: J; w) N                        new FArgumentsImpl (this, sel)));# A( o7 b+ q' }7 ^2 w. W" Q* u/ q8 {
    } catch (Exception e) {
0 `8 u% ?- O. L: ~0 V      e.printStackTrace (System.err);
, @" _( z3 ?- M( S0 h- V( @  {3 f* x    }
" y6 R& Y# M/ t+ x0 o    # n) d. k8 E1 R! O; m& ~
    syncUpdateOrder ();
( E3 [; k; W& R" l* C3 Y7 ^! c
5 ?  L* w0 R, N9 X. _; E1 M    try {: v8 A2 d: M, k0 ?- B0 A
      modelActions.createActionTo$message 0 Y& z& ]& ]5 E2 Y3 K
        (heat, new Selector (heat.getClass (), "updateLattice", false));
) Z) b2 H- H" \    } catch (Exception e) {
+ f# l, L. ~  [      System.err.println("Exception updateLattice: " + e.getMessage ());
; V+ E8 _; p, R% c$ S) c8 l- O9 {% D" w    }
. y& |, i8 x# R* K1 ^! n        
; G1 O' S! q3 ]9 S1 H6 f; s    // Then we create a schedule that executes the+ X; F' O0 J" X2 ?8 t. N, k" ^/ y
    // modelActions. modelActions is an ActionGroup, by itself it& v( K& v4 C- h9 t
    // has no notion of time. In order to have it executed in
0 e! J: }  ^! G( J& S$ P    // time, we create a Schedule that says to use the) z, z. y' y4 D$ I8 P6 J4 R$ h
    // modelActions ActionGroup at particular times.  This  I* ^0 M0 f( ?, O8 g
    // schedule has a repeat interval of 1, it will loop every7 Y1 ]6 ]5 x5 }- ], [3 P8 K% c: L
    // time step.  The action is executed at time 0 relative to1 w7 u, ]4 J9 |( O, P
    // the beginning of the loop.
, p+ K4 f. ?5 u* S/ r% X
% A. A6 `5 ]! r# t7 D. t, t    // This is a simple schedule, with only one action that is
! L5 T% W; z, N4 N9 G    // just repeated every time. See jmousetrap for more! z+ O3 }# g( j: w% @5 D# v! {
    // complicated schedules.& B$ u6 x7 ~/ [' v5 D, _
  " u) n1 `0 j; ^
    modelSchedule = new ScheduleImpl (getZone (), 1);0 b- p& M  T( |
    modelSchedule.at$createAction (0, modelActions);! e* S& i0 o( j1 _+ `# m1 @. ^( S7 S
        
+ `5 p6 ]$ w: [1 X& y3 s    return this;  v7 h$ ?$ @0 D. A
  }
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