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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:
, E4 }3 q/ k( t6 c3 P5 E- O3 _3 j3 u4 }5 p" w
public Object buildActions () {$ V3 N8 A5 I. g3 Z" Z4 x* v& d
    super.buildActions();
( e- ~* o1 h% {5 Q4 V2 U- _, B9 _" W   
. ?9 y$ _4 R6 Z8 F+ ~    // Create the list of simulation actions. We put these in& H0 A, n' d( ^* U5 m; I
    // an action group, because we want these actions to be$ R8 ~7 Q- C; \( V
    // executed in a specific order, but these steps should
0 ^/ ^" b& ^+ z4 M9 c: V- J. u& f    // take no (simulated) time. The M(foo) means "The message
6 u9 n# p  l, G7 J/ @0 m    // called <foo>". You can send a message To a particular6 h4 B/ g  W- t# }4 R/ a
    // object, or ForEach object in a collection.
  q" e4 Y$ b, e# v" c        
1 R7 v5 N% [2 K& m& L    // Note we update the heatspace in two phases: first run+ L2 U% v, M  N, Z6 B$ @+ n
    // diffusion, then run "updateWorld" to actually enact the0 C+ T' L! m1 w# t* ~2 r6 i7 O- V
    // changes the heatbugs have made. The ordering here is
+ F5 y1 w4 G5 `# v5 h    // significant!. P8 |1 s1 x0 h& y) q
        0 P" m. b0 J) M/ ~# X
    // Note also, that with the additional
9 O7 @5 j. e+ s    // `randomizeHeatbugUpdateOrder' Boolean flag we can0 x6 o* t1 |: |9 ~
    // randomize the order in which the bugs actually run
4 k4 O$ ~- `$ u$ U! c9 K/ |) G    // their step rule.  This has the effect of removing any
" j' M3 F3 z( [7 i  M, m    // systematic bias in the iteration throught the heatbug0 N) w4 A! f2 b7 F
    // list from timestep to timestep
3 _9 D( B+ k& ^- @        
' ]* K7 `( c$ S2 d+ W* S    // By default, all `createActionForEach' modelActions have
4 i3 w/ n. j- j# ]    // a default order of `Sequential', which means that the9 R; @# \2 k7 {
    // order of iteration through the `heatbugList' will be2 j" [( [" F5 q" u2 N: q
    // identical (assuming the list order is not changed
  E' G! `' R8 o% z4 X% }& H% \. ?    // indirectly by some other process).
  X6 v8 {& A) u- G  C& P   
& J& z+ f  {" ?& O) g1 d    modelActions = new ActionGroupImpl (getZone ());* d& c7 z+ c+ v9 _8 c2 G
2 }2 A% h$ F# g+ |. ^
    try {4 I* R% ?$ ?* ]; f, x  @7 j/ F
      modelActions.createActionTo$message3 I4 e8 u8 N2 ~( v+ C" U) O: M
        (heat, new Selector (heat.getClass (), "stepRule", false));+ }+ @, T" ~5 m
    } catch (Exception e) {
: B" g) W' D+ J6 e9 ~& F      System.err.println ("Exception stepRule: " + e.getMessage ());
  |8 h5 L$ P5 @2 f# }: t* r    }
/ {( U  x/ c5 x, N( l
, L4 U: ]. O, ^: w    try {4 }4 o) @& K/ M" F& c1 r
      Heatbug proto = (Heatbug) heatbugList.get (0);
4 l- i: K$ N; [      Selector sel = * K0 p/ u* \9 |3 V& }
        new Selector (proto.getClass (), "heatbugStep", false);
) a% H1 _+ o) L      actionForEach =
3 |9 V% H4 `: `        modelActions.createFActionForEachHomogeneous$call
2 E5 y& s8 E* r' N5 l/ s$ N( Q        (heatbugList,6 A6 d; x' K/ v" Y
         new FCallImpl (this, proto, sel,
& l, }+ m: {% V( @. U0 n                        new FArgumentsImpl (this, sel)));
/ [; f! z* U5 J& ^2 I    } catch (Exception e) {6 M- S% W: g7 m# E" Z+ W
      e.printStackTrace (System.err);$ y- R( M+ {1 v' i2 P
    }+ _' _: \, C7 ^. e& O- N
    . Z' e# G& ]" H6 e; m* E* S4 b1 y, F
    syncUpdateOrder ();
3 u' v- p) K: f) I6 L7 K  w
9 j7 M. M$ `$ x) }    try {
, h$ T, ^4 i% r/ x. P      modelActions.createActionTo$message ' }9 O. m6 D. K
        (heat, new Selector (heat.getClass (), "updateLattice", false));
0 t+ J  ?: j/ B$ @% u    } catch (Exception e) {
& w" D* G( k6 O& j; A: `      System.err.println("Exception updateLattice: " + e.getMessage ());+ B# c0 [% S: {$ b# \
    }+ L. Z) E/ z3 m+ V6 V+ l0 j
        
; N6 s; A, T3 t5 b    // Then we create a schedule that executes the
6 l3 K8 j" n/ C) u& ]    // modelActions. modelActions is an ActionGroup, by itself it
. d; Y( e0 f8 O    // has no notion of time. In order to have it executed in
, A( n1 e; F2 W3 ~/ d    // time, we create a Schedule that says to use the4 k- e9 l6 T1 d: ^. \9 b) }' p
    // modelActions ActionGroup at particular times.  This
  M% T! `3 ~& [    // schedule has a repeat interval of 1, it will loop every2 X( c3 t* f) i$ j) l- ?# j1 G
    // time step.  The action is executed at time 0 relative to6 Q; Z8 N' E0 g
    // the beginning of the loop.
/ ~+ x: x" O$ j/ w- g1 ^& {& b. C& ^
    // This is a simple schedule, with only one action that is
$ u1 O- J" {+ s( r    // just repeated every time. See jmousetrap for more
7 N' a( n3 Q( l  @% K) x    // complicated schedules.8 Q- z- c1 m# Z6 R- k' L+ Y( A
  
- G+ Z; P6 ^* h! n    modelSchedule = new ScheduleImpl (getZone (), 1);
9 Z' y' p# o2 `+ \7 E5 b  a    modelSchedule.at$createAction (0, modelActions);
' N( ?9 H3 T( n  S0 x/ b        , L7 u; K3 ]& S: ]& |, n
    return this;
' A/ k% k/ W  a  }
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