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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:# M. Z& U5 X6 O$ _5 t

, U+ }, F1 y  E% I public Object buildActions () {) V( n, }/ r  y/ K5 N% w" @+ t, K& \
    super.buildActions();
( j+ q. R* v5 M( G0 u* F4 @. J   
2 Z) ~; o" j3 I( B* Y! Y& E8 W    // Create the list of simulation actions. We put these in
" }2 [5 v" i2 V+ Y- u    // an action group, because we want these actions to be' J  v' k6 j% V/ Y% u
    // executed in a specific order, but these steps should; h9 _4 C9 D" @
    // take no (simulated) time. The M(foo) means "The message
1 c3 J2 \& t$ l1 M  ^# ?1 B: A( p    // called <foo>". You can send a message To a particular3 S0 M5 Z- h4 F: _- _* P9 v% M+ O! d
    // object, or ForEach object in a collection.
% p$ c  X, A& F6 x        
/ c  {* j6 R- h2 ?0 H    // Note we update the heatspace in two phases: first run, [) B0 S# V( w5 o
    // diffusion, then run "updateWorld" to actually enact the
- [' J# P  @5 M3 D    // changes the heatbugs have made. The ordering here is; G9 v  N5 G1 w' k7 W' _1 `, [/ b
    // significant!
& X" v# w5 f. T( P; n# [        
+ u' u/ a7 s: C    // Note also, that with the additional: i8 a2 D) s5 d3 x- o( n3 j
    // `randomizeHeatbugUpdateOrder' Boolean flag we can, E5 _; _. D8 L
    // randomize the order in which the bugs actually run
0 ~0 M: R- r- n4 q2 ]* k: I    // their step rule.  This has the effect of removing any
7 G6 ~" l+ T4 F, g( J8 `    // systematic bias in the iteration throught the heatbug
  h' w+ N! t' U1 J  Z9 K& B. Z    // list from timestep to timestep
: K. F" s& u! @8 p  |, e0 m        
! Z3 R$ d. p: K    // By default, all `createActionForEach' modelActions have
# @0 }# [* U  n/ L    // a default order of `Sequential', which means that the) c" t5 n6 B9 Z# ~" u& v9 b+ t
    // order of iteration through the `heatbugList' will be$ v( a* \" v' g: W2 Q3 e9 ^- m
    // identical (assuming the list order is not changed
* X, ^6 g8 J0 E2 R    // indirectly by some other process).
9 l. `3 L$ E  r: q   
* i# e6 `( x# Z    modelActions = new ActionGroupImpl (getZone ());4 Z$ B+ h& m8 |6 W7 \/ Y8 C

& D" J9 P( Q  t2 {% p5 b    try {
. }; ?. T8 N# X% ^* a, r- f      modelActions.createActionTo$message7 ?1 A' A7 L' P. h# V
        (heat, new Selector (heat.getClass (), "stepRule", false));" x% G- ^$ ]+ {; r* K1 g  V$ f
    } catch (Exception e) {
7 ~5 r8 j) Z) n! j9 H  b3 \      System.err.println ("Exception stepRule: " + e.getMessage ());
! s8 ?  [* m& x0 l) _4 Q    }
5 G% Z! u5 F4 d% G$ ]6 U4 ], k1 Q5 K. J1 K6 V" Q5 A
    try {
  ?3 F. Q' T* L: x      Heatbug proto = (Heatbug) heatbugList.get (0);
% ~+ P) B/ O) j; k2 C  I, _7 j      Selector sel =
3 U7 H5 c; N* S- b        new Selector (proto.getClass (), "heatbugStep", false);
0 d" H- D3 g2 Y) ?) Q7 t      actionForEach =
: S8 A/ ~1 N7 Z* E+ ~        modelActions.createFActionForEachHomogeneous$call
1 h  }( \- S+ x1 u        (heatbugList,4 ]# l, v$ P5 O0 V7 G" m" K0 ~
         new FCallImpl (this, proto, sel,, s, f0 A9 v& V* @3 }8 ~
                        new FArgumentsImpl (this, sel)));
. s, Y7 ?8 k$ m# a5 q    } catch (Exception e) {0 p- M4 u# ^  G" g/ s3 A; m
      e.printStackTrace (System.err);; [, q7 a$ a" H4 L( O3 V, X. }1 l
    }) Z3 Y: p' f; I  m# I6 y: I) x, @8 k
      d* B# f: k$ f% N
    syncUpdateOrder ();9 b! z$ t# }: x2 z5 J# o
! a* I( I: Y. U, {" {1 T0 t; B  o
    try {
  _4 V" p" o% M. _* @- W" s4 \      modelActions.createActionTo$message
7 u* g; `0 i1 c* E  [2 P8 Z7 j" s- V        (heat, new Selector (heat.getClass (), "updateLattice", false));1 [- d% m8 w: A' p& O
    } catch (Exception e) {2 U0 T. |* C! d! v1 A7 o3 X' C
      System.err.println("Exception updateLattice: " + e.getMessage ());
: U& x2 }5 w' w* ]! @3 K' T. f    }
2 ~7 X2 m: J$ U2 I        
& B. ?$ u' d8 B; \  W( ]& U    // Then we create a schedule that executes the( X% a6 E* j* O1 C$ B: |, ^
    // modelActions. modelActions is an ActionGroup, by itself it
& o: a  C' M5 [+ g- T6 S    // has no notion of time. In order to have it executed in
7 |( `8 @6 D  x: E8 f& f    // time, we create a Schedule that says to use the
0 I7 k% X8 ^' |4 V1 N$ |" P. r    // modelActions ActionGroup at particular times.  This
, U$ I9 l+ X- R    // schedule has a repeat interval of 1, it will loop every% k* W/ v- m; F$ P8 e
    // time step.  The action is executed at time 0 relative to
' k, j4 a( g' u. N    // the beginning of the loop.
8 U% Q! X1 ~6 g1 J8 U: K  G  r1 |  H7 }! m" U* ^* c
    // This is a simple schedule, with only one action that is8 A; [% Z* [6 D
    // just repeated every time. See jmousetrap for more
; f- F( O* d& A6 i9 ~/ P$ j    // complicated schedules.$ {- O/ F& w2 T  K
  , ^( K, t+ |1 g2 ~
    modelSchedule = new ScheduleImpl (getZone (), 1);& J9 s+ T2 z7 Q5 p4 |3 u
    modelSchedule.at$createAction (0, modelActions);. l# ]) I) q1 w" p
        ' I! [$ N: z4 V  u
    return this;1 R$ Y, ?, @& S  V4 f  X0 J7 M
  }
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