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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:& ]6 \8 a5 O- e5 X
1 r. i' ~! q' M3 x( p
public Object buildActions () {
( `, Z) V" k% Q    super.buildActions();  P9 d+ @" t9 Q4 u8 [& a
   
7 ?# d3 ~0 @/ v$ n3 a    // Create the list of simulation actions. We put these in1 c0 V6 r% K% o8 I( B
    // an action group, because we want these actions to be
& J. d1 Y( u0 f, a. A6 v    // executed in a specific order, but these steps should1 _6 q# z6 ?5 S- [
    // take no (simulated) time. The M(foo) means "The message
1 S# Y4 S+ c% o- m' I4 B    // called <foo>". You can send a message To a particular
. |2 e$ v3 ^' [6 `$ l9 e1 e0 y    // object, or ForEach object in a collection.
, ?1 W5 C' l& N$ U8 S2 x* b        
; f3 |: k( q; K. a( b! l    // Note we update the heatspace in two phases: first run
+ k& z$ u- j7 a8 G    // diffusion, then run "updateWorld" to actually enact the) I9 h# \2 M( b5 z7 u! E
    // changes the heatbugs have made. The ordering here is
& Z' m9 J/ E  @$ ?" Q6 v4 L* G" J    // significant!7 y. K1 y3 L, e! n% T: Z# W
        . e5 o3 I) \: ]5 R" M* \8 @5 A" X
    // Note also, that with the additional
! s/ p! K/ E/ z2 u    // `randomizeHeatbugUpdateOrder' Boolean flag we can
, `) V2 `: F+ {    // randomize the order in which the bugs actually run
3 l3 I+ G- k2 p, p/ X    // their step rule.  This has the effect of removing any5 Q7 U+ y) ~! b4 `
    // systematic bias in the iteration throught the heatbug9 Y$ S7 ~0 G* z. {, @
    // list from timestep to timestep2 z7 r5 X: u; ]4 E9 {
        3 U8 x; M4 H# P& A  Q
    // By default, all `createActionForEach' modelActions have* ?2 ~" p, o( L( o0 H* c
    // a default order of `Sequential', which means that the1 i+ I2 ]: h. k
    // order of iteration through the `heatbugList' will be
  @6 ~7 x9 B: H+ s, r, y9 J0 G; N    // identical (assuming the list order is not changed
2 j9 L" l# s% c! M3 L% R. @    // indirectly by some other process).- q8 g7 J1 v( h! X# F) d) ?6 S
   
8 g6 Q1 }" }  v4 s. c  Y5 k7 _& G    modelActions = new ActionGroupImpl (getZone ());( ^. h( Z$ a! I- H
. M7 \& ]8 T1 C4 w) A
    try {  |9 S8 c9 R1 n2 i' R- m9 A* Y
      modelActions.createActionTo$message
: a9 M+ q  {8 X0 {        (heat, new Selector (heat.getClass (), "stepRule", false));9 R, ?$ Y$ J/ R2 K# d; l
    } catch (Exception e) {- f8 g& [! ?+ H( ?2 _1 q9 B8 _7 E! Z
      System.err.println ("Exception stepRule: " + e.getMessage ());
. l6 n/ `5 j  ~, z    }% p% }; o' b; ]6 ^1 }: N. f

/ p4 Z' B- C  U" i  \: Q# d9 r# l( Z    try {
& C, y. U! U, s9 g! Q      Heatbug proto = (Heatbug) heatbugList.get (0);
$ C* P4 P8 E( D% ?      Selector sel =
0 T9 ?) _: K) h& c( x8 L        new Selector (proto.getClass (), "heatbugStep", false);
# Q' H! }+ e3 {" q" z) ~      actionForEach =
, Y9 U% K- G: K& P0 M  r: ]4 d        modelActions.createFActionForEachHomogeneous$call) D: e5 Z: i$ {3 x& |6 I
        (heatbugList,
4 l% O/ w! S* s         new FCallImpl (this, proto, sel,. U4 ~4 ~" Q7 S! j
                        new FArgumentsImpl (this, sel)));
9 z6 ]' F  J- _% W    } catch (Exception e) {0 y8 d" q- R1 Y# Z
      e.printStackTrace (System.err);
, |6 d& x9 S( x9 h1 p    }( |/ ]7 X: d3 @6 Q7 ?; S
    ) ~3 ^7 P% L4 I# [8 i
    syncUpdateOrder ();
  P6 l' w2 [! o. E9 k! _/ E$ u, |3 g4 I0 r. J6 Z0 _1 C8 A
    try {  z, J, d: b. w% u& g: B1 a! D+ q
      modelActions.createActionTo$message ! n6 {  W/ i5 {+ x
        (heat, new Selector (heat.getClass (), "updateLattice", false));( l7 ?  _3 v  o& P7 |# m
    } catch (Exception e) {- @7 o8 ?) k/ V
      System.err.println("Exception updateLattice: " + e.getMessage ());- a2 `. X6 W7 K( ?
    }
/ M7 {' @. j, `: S% @% X; y        5 y( l8 d7 q! i. n
    // Then we create a schedule that executes the* W% z- N7 ~9 l' `4 l
    // modelActions. modelActions is an ActionGroup, by itself it( L& U: ~- q$ f3 H
    // has no notion of time. In order to have it executed in7 F' A/ c# X+ r& Y) t4 P& g
    // time, we create a Schedule that says to use the
! |6 s/ Q: \: h. D    // modelActions ActionGroup at particular times.  This
2 v$ M, z( S% P2 l5 h" |3 q" h! u  e( C    // schedule has a repeat interval of 1, it will loop every, }$ N6 q7 y4 S
    // time step.  The action is executed at time 0 relative to. Q: a4 W, j! Y, u3 |/ m
    // the beginning of the loop.
( V2 V) l( G9 B& y5 ~  j+ u  d4 w; R( \! w
    // This is a simple schedule, with only one action that is! ^7 o" Q; Q2 g; f& h8 }
    // just repeated every time. See jmousetrap for more& A6 k3 h# y! c3 O
    // complicated schedules.2 a, _* H( I: n1 s4 [
  2 E& N$ `! H. D: a/ ?" z
    modelSchedule = new ScheduleImpl (getZone (), 1);
) h, v- D% i  d# a$ N    modelSchedule.at$createAction (0, modelActions);
+ \: O, E' m0 a: {8 m6 \        
8 |* k, v% J$ u+ l    return this;5 G! a4 y+ \2 y$ v
  }
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