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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:
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public Object buildActions () {
+ s8 S( q* B, O( a/ A# j    super.buildActions();6 I* E  \3 s; W4 @& x( @6 s
   
4 O! Q: x4 @$ K    // Create the list of simulation actions. We put these in
( K+ L5 ]$ G/ l: L5 |    // an action group, because we want these actions to be1 k' i$ K0 ]' [& h( @: _
    // executed in a specific order, but these steps should7 g, i1 J( W& d( E
    // take no (simulated) time. The M(foo) means "The message$ k9 d% I/ w  a8 g/ z5 c8 w9 r
    // called <foo>". You can send a message To a particular
! G1 O+ g6 s7 G! Q2 r& T3 n) ~    // object, or ForEach object in a collection.! l+ h) n# F% k4 b2 t
        8 l7 E' a( T5 r; ~
    // Note we update the heatspace in two phases: first run5 V8 O5 r* _4 M5 a  k
    // diffusion, then run "updateWorld" to actually enact the  V7 b5 U" N* B' d$ Q$ h
    // changes the heatbugs have made. The ordering here is
& l. g! r% s2 W8 }6 ]4 r$ P    // significant!
6 @: \5 k/ X# X1 w5 e2 q9 K2 _        
4 s' H4 G0 R( {& P) e2 x    // Note also, that with the additional$ x/ T& S& C) y3 Y+ G( L
    // `randomizeHeatbugUpdateOrder' Boolean flag we can1 ]& W) A- f8 r% _! s5 B3 E: J
    // randomize the order in which the bugs actually run' p8 b; `. x0 D+ r, x2 Z. k
    // their step rule.  This has the effect of removing any. g. Z2 I: f: X8 ^: t$ x& O
    // systematic bias in the iteration throught the heatbug9 @: l+ r/ a: `! V/ {; s6 j
    // list from timestep to timestep
( ~& J& ^5 I3 [) y5 v2 C% _. Q        
9 e9 F. X  o+ R. g* @    // By default, all `createActionForEach' modelActions have
6 l' A. H4 l& {+ K- B1 O6 q    // a default order of `Sequential', which means that the
5 M3 M, z4 |6 |8 L1 f- o3 k    // order of iteration through the `heatbugList' will be( J, m3 I" W. a! r
    // identical (assuming the list order is not changed2 ^. e+ T$ D' ?3 R7 `5 y$ `5 C, v& l
    // indirectly by some other process).- s. Y& L* G$ h$ M1 o* w  L
   
% J) }) ?: R" X" S% M% l4 P    modelActions = new ActionGroupImpl (getZone ());0 B' E' T: c* B+ }

/ t7 I* I- C, B; F0 f    try {
! E3 O6 X6 j3 e2 ?; y$ D      modelActions.createActionTo$message
$ N$ e: U+ e1 h) _        (heat, new Selector (heat.getClass (), "stepRule", false));
4 l' P5 _4 k! U5 x5 p' b    } catch (Exception e) {
2 g. R1 n8 ?9 t- h      System.err.println ("Exception stepRule: " + e.getMessage ());
7 G% [: l- d  |9 i+ E3 J! k$ L    }( E" C6 z' d2 O9 e, b/ W

: b2 K4 A$ P- c    try {; T' d! K5 [0 a: s9 P
      Heatbug proto = (Heatbug) heatbugList.get (0);
& N1 ]; n  S% I8 }6 l' h      Selector sel = 2 M$ c. ?/ _' Q4 W  G
        new Selector (proto.getClass (), "heatbugStep", false);: l+ R" l3 {9 R; B% l+ O$ a
      actionForEach =' b0 G# W; E  |  z! q/ G
        modelActions.createFActionForEachHomogeneous$call
  X, G% ^" j! ^0 A* L        (heatbugList," f6 y0 t9 Y* Z5 m) s
         new FCallImpl (this, proto, sel,7 R$ R2 g7 m' H3 K. j8 J$ b  ~
                        new FArgumentsImpl (this, sel)));
" E( H$ `4 O" t3 y: ]$ e1 r* |    } catch (Exception e) {) n) I5 B. E: m, l6 \
      e.printStackTrace (System.err);+ O, ?" u3 G5 [
    }
* d+ D  l) E7 K7 K, E2 T8 E) L' `   
5 c# O. q1 S$ M. g    syncUpdateOrder ();
1 f8 c4 e5 I, S7 a
! D) X8 R3 n) P; W. y; J6 F5 Y" j    try {( M! ~; @9 |, S" i" |. P
      modelActions.createActionTo$message
+ z  g) x% |# ]2 b        (heat, new Selector (heat.getClass (), "updateLattice", false));7 Y0 u4 u- A% k: t5 m& g
    } catch (Exception e) {
% e% B0 K0 L) P      System.err.println("Exception updateLattice: " + e.getMessage ());6 c: @( u% f- g! x1 d& B, X" _
    }
* F1 g8 c& E& Q        9 q; I" z$ I4 j( D9 t1 L7 d1 m1 z
    // Then we create a schedule that executes the
, [7 R$ F. G% W    // modelActions. modelActions is an ActionGroup, by itself it0 s7 N* Y9 G4 E6 h) k( u
    // has no notion of time. In order to have it executed in
9 J8 K4 ^& @, S* f7 M) E1 g    // time, we create a Schedule that says to use the
) a" B% r$ Y8 Y; C" j+ t7 ]    // modelActions ActionGroup at particular times.  This3 A6 U, ^- r6 e
    // schedule has a repeat interval of 1, it will loop every
9 [* i& g1 p! u. ~" D* q    // time step.  The action is executed at time 0 relative to, o  r" R7 s: K% }0 [
    // the beginning of the loop.
( M; Q' L1 i& l; T( c5 Q6 j" F  \1 G% R% j
    // This is a simple schedule, with only one action that is
- u9 x  ~  h. m5 U' [    // just repeated every time. See jmousetrap for more$ }! ~+ v  J1 V3 P! U# }) A
    // complicated schedules.
/ e2 ?1 C' _& v2 x* ^. T  8 A4 Q% g# s: s( d1 v+ t' S
    modelSchedule = new ScheduleImpl (getZone (), 1);2 E- S' G0 c7 c) J
    modelSchedule.at$createAction (0, modelActions);9 O0 B4 Q+ K9 \
        
6 T" r4 b. }( K4 K5 ]. \    return this;+ _# f+ z( y& w; n6 c% C7 t
  }
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