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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:- X  Z+ n4 x0 C; Y2 ~& i4 m- k/ c. y

4 ^0 U. E' Z  ~ public Object buildActions () {8 _8 B- Z- @( P5 B4 V, y
    super.buildActions();
# _- {# E2 {  i1 ?    , A% J/ ^; @& w! R3 ~7 X! i3 j
    // Create the list of simulation actions. We put these in, d3 @  k5 Y1 u5 S7 S5 N# X6 P
    // an action group, because we want these actions to be" z5 D( s5 ]/ H! s- k
    // executed in a specific order, but these steps should
. \9 k6 ?' g) E& p    // take no (simulated) time. The M(foo) means "The message9 G/ M' a* p$ U- N' R$ _$ g+ p
    // called <foo>". You can send a message To a particular
: ]* l4 c6 \2 f) v9 u: g    // object, or ForEach object in a collection.2 S/ G. p6 H+ B* e  Z
        
7 k- Q# p; o* v    // Note we update the heatspace in two phases: first run
& s' P/ D8 Y% O5 i! ]! C+ i    // diffusion, then run "updateWorld" to actually enact the: g0 @' _/ y; f7 R6 p$ V
    // changes the heatbugs have made. The ordering here is
) K; f' p, ^! ^4 e8 Y* I    // significant!
( G# v2 G+ {) v. ]9 n: X        2 g+ R+ [& r' l. o
    // Note also, that with the additional
! a4 O- M. C7 f$ J! `, d9 P7 E    // `randomizeHeatbugUpdateOrder' Boolean flag we can1 S2 R. L1 {  u/ M2 z
    // randomize the order in which the bugs actually run
, R1 `3 ^% z- i- A    // their step rule.  This has the effect of removing any
+ @, y1 `9 Z4 g/ r    // systematic bias in the iteration throught the heatbug# ~; f8 W! O) k
    // list from timestep to timestep
; [! q- n% j( w- \7 O* z$ M7 Q: u        
! z; x- w2 |5 Q" @3 w+ s& p    // By default, all `createActionForEach' modelActions have) H- o: o% ?1 E
    // a default order of `Sequential', which means that the
/ t2 K, Q7 U) z% x+ n    // order of iteration through the `heatbugList' will be" `) k" h- p' x& |0 L
    // identical (assuming the list order is not changed
6 m: A4 W! U: p; r& @2 j6 U    // indirectly by some other process).
' X# W4 i# y9 C5 n) z    ; f. h+ O+ m3 [7 e, q
    modelActions = new ActionGroupImpl (getZone ());  |" K+ n: {' B5 J' _

# Y( N7 t2 g* o9 V, V$ Z    try {
3 \+ J4 d7 Y" w: V9 n  {/ O      modelActions.createActionTo$message9 ]1 f! S) S. ~: `- {: N; G) B. y
        (heat, new Selector (heat.getClass (), "stepRule", false));
( e7 s1 h$ e! J; d5 g    } catch (Exception e) {: |$ N0 N0 a% H! z; _. T6 j
      System.err.println ("Exception stepRule: " + e.getMessage ());
% z( t% i: N- Z! u, k) g    }# d9 T" f5 ]( b' {) {
0 j) T) y# O$ o/ R
    try {+ j2 ], M# O' c* @  a
      Heatbug proto = (Heatbug) heatbugList.get (0);
. t+ V6 D" x2 a1 l2 p( }8 s      Selector sel =
. d$ ]" c" c* u  k  E7 z        new Selector (proto.getClass (), "heatbugStep", false);" A& X0 t9 O* O% \0 y
      actionForEach =
7 q5 ]$ v' t+ v& T; d2 C        modelActions.createFActionForEachHomogeneous$call. x6 t4 q5 a+ t7 E/ `
        (heatbugList,
- B8 w* m6 a8 w8 z/ n3 s5 ]* ?         new FCallImpl (this, proto, sel,2 o/ P! t& |$ z* N+ {7 x5 {
                        new FArgumentsImpl (this, sel)));
4 `4 b" Z: M# T, I    } catch (Exception e) {0 L' O0 d7 b5 M( ~- v! ^: y
      e.printStackTrace (System.err);
2 a& ?7 ~6 a! v) C3 e5 m7 H    }
$ @) ~9 [  Q4 [8 c& u( i   
9 C! |  @1 {3 F6 M  S- ?3 Y    syncUpdateOrder ();: L7 @# ^; c8 c% N) U
- _, ]+ _0 ~) {/ A& {
    try {
+ Y  p( |( ]) `0 D/ x2 U      modelActions.createActionTo$message
( T0 w. g' ?. A        (heat, new Selector (heat.getClass (), "updateLattice", false));
, {9 M. y: ~6 O0 u" A5 g  |    } catch (Exception e) {
, J. |& s/ l+ P; U4 d      System.err.println("Exception updateLattice: " + e.getMessage ());
1 x1 s8 i" E* q( t/ u  }& z  F. x, U    }
" D! V1 g! i* I8 J& T        
4 U  f8 K! d3 r  Z) c    // Then we create a schedule that executes the9 V  E9 o, Q1 M7 F
    // modelActions. modelActions is an ActionGroup, by itself it
4 H- O/ z/ j- ]1 R: N+ S; T: X    // has no notion of time. In order to have it executed in/ m6 k, A, y; p7 |
    // time, we create a Schedule that says to use the! P+ L* p* \9 S. O2 ]
    // modelActions ActionGroup at particular times.  This
; @, k' [3 ~. I2 e' H    // schedule has a repeat interval of 1, it will loop every
! ]6 G8 p- w% F. \* q% U1 E    // time step.  The action is executed at time 0 relative to$ B" @8 T) a8 s- Z
    // the beginning of the loop.5 K: A& `7 ~9 M0 S

& f! O0 g4 h0 m' a2 Q; F    // This is a simple schedule, with only one action that is
; q; U& v7 l+ U2 Y  n/ P3 f    // just repeated every time. See jmousetrap for more# p& s6 [. k* y$ s, S, N
    // complicated schedules.8 a4 S" _  c, K# i" \
  * ^& y( I2 G. y' }6 |0 ~
    modelSchedule = new ScheduleImpl (getZone (), 1);) V3 b) n$ M, `, I5 L- Z
    modelSchedule.at$createAction (0, modelActions);* ~" s  m* l! Q  }6 I
        - N" X) ~0 `5 G, H' A5 v
    return this;. K* y+ p7 D/ V8 @4 a
  }
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