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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:& O/ a  \! ~' A1 T, w
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public Object buildActions () {3 R# S! S) J8 l/ K  {9 I! [
    super.buildActions();
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    // Create the list of simulation actions. We put these in7 M) q2 t4 J( K3 v" A
    // an action group, because we want these actions to be$ `8 m3 e2 T6 \: K
    // executed in a specific order, but these steps should8 x9 H4 f! l! T; U! v5 g2 @' e
    // take no (simulated) time. The M(foo) means "The message
, u7 A1 s$ y" z& w$ [    // called <foo>". You can send a message To a particular
8 J5 b5 L) m9 ]! Y0 R    // object, or ForEach object in a collection.
/ m( ]3 i( c6 O0 t8 M' x0 S        
4 h; S2 v( l$ Z4 C    // Note we update the heatspace in two phases: first run
! ]# I/ f6 H# k% l+ ^9 x# a7 M$ o! X    // diffusion, then run "updateWorld" to actually enact the- c1 S% U5 [' z
    // changes the heatbugs have made. The ordering here is
, T6 v) W; i/ U3 I$ l, v" @4 Y2 L& e    // significant!) _  D$ R+ i+ V( k; d  u
        6 S* c2 G5 k& j$ o' ]0 [6 Q3 a, R6 E
    // Note also, that with the additional
% ~8 l$ H" Y& w- n3 ]9 P8 L    // `randomizeHeatbugUpdateOrder' Boolean flag we can
5 b$ X1 c! M9 |    // randomize the order in which the bugs actually run9 m4 j' Z2 k& d8 M9 R
    // their step rule.  This has the effect of removing any
- |! R( U: s% Y" n+ }) d    // systematic bias in the iteration throught the heatbug
; N  f) g7 o2 E7 }' I" M    // list from timestep to timestep
0 O- Z7 g, F* \5 O          \2 F+ j4 A% X9 s& G$ W8 u1 n
    // By default, all `createActionForEach' modelActions have
; ?% T( Y! T1 D% [$ U( k3 l    // a default order of `Sequential', which means that the% q' c% j9 y$ N$ R/ |& w( @
    // order of iteration through the `heatbugList' will be- f, z" P; u5 `/ M+ I! b$ V
    // identical (assuming the list order is not changed
8 @4 X) w' f/ `    // indirectly by some other process).+ I* J( m2 @2 R$ H" [! q2 _5 w3 ^
   
# d) L$ g) Z) }) l& ?( x: l% Y    modelActions = new ActionGroupImpl (getZone ());
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    try {# N# R- M) R. W3 }% }( P
      modelActions.createActionTo$message
8 ?" b) E+ e& {' @0 l        (heat, new Selector (heat.getClass (), "stepRule", false));
8 ~. s" Q/ R0 |) [6 q0 M" V6 U    } catch (Exception e) {+ q0 Y( W% f6 }* J( [+ b
      System.err.println ("Exception stepRule: " + e.getMessage ());
3 {1 t* C- b% ^1 Y9 U% O. R    }
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$ z& J! S+ g  k  R    try {3 e- N2 G0 A  G
      Heatbug proto = (Heatbug) heatbugList.get (0);7 }, `, f- w7 f
      Selector sel =
1 k1 i1 b+ l. w* }) d1 P        new Selector (proto.getClass (), "heatbugStep", false);5 K$ C' C9 F0 R' v, h, ~
      actionForEach =1 u! N, k: B, P' }6 k& s
        modelActions.createFActionForEachHomogeneous$call
, z3 ]* M3 ]/ f6 I/ M& Y        (heatbugList,1 r0 U7 V/ L( c8 }3 U$ z- y) a
         new FCallImpl (this, proto, sel,# {, L7 R+ J7 Y* g& U3 ~
                        new FArgumentsImpl (this, sel)));1 J  H2 u# O* j- w: ?+ u4 w6 G
    } catch (Exception e) {
" _! E3 _  q( i0 m3 p$ o      e.printStackTrace (System.err);# l6 g! h2 k, H* p% P% w
    }
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    syncUpdateOrder ();
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    try {( I. J% d) `+ L8 U/ \' J+ n
      modelActions.createActionTo$message , l2 I; x" ~( b) ?5 @4 _4 o
        (heat, new Selector (heat.getClass (), "updateLattice", false));1 z' u/ B% k( g+ b% k
    } catch (Exception e) {5 S( j1 r  A( d! ?! C
      System.err.println("Exception updateLattice: " + e.getMessage ());8 a! \7 L- C8 N  W- U
    }
; I' e/ {4 t4 P3 Z) M        
* ^+ \$ e# J% ^. e2 Y$ I9 F- I& d1 z+ U3 Z    // Then we create a schedule that executes the
) F" Z/ [- X7 p    // modelActions. modelActions is an ActionGroup, by itself it
* E' f6 P/ f  A1 D& g  `    // has no notion of time. In order to have it executed in6 t! ^1 p: h) X. Q: p$ X
    // time, we create a Schedule that says to use the  {$ s* j1 S. a
    // modelActions ActionGroup at particular times.  This9 H" Y+ M  Q" O0 n
    // schedule has a repeat interval of 1, it will loop every
& o; N7 R) }  j) {2 g% J    // time step.  The action is executed at time 0 relative to) ^5 g8 l/ e3 }0 S8 U  b- V
    // the beginning of the loop.$ W1 E* a2 ~' X* u5 Y
, e# W' k8 ]( M" J4 y
    // This is a simple schedule, with only one action that is9 |2 t# B% f+ t' f
    // just repeated every time. See jmousetrap for more1 U+ ]' H1 D- v4 P8 o; M
    // complicated schedules.
# B2 Z8 `% z! V2 d# R- p: R  ) U9 N$ f" F& s+ Y6 {. B" ?
    modelSchedule = new ScheduleImpl (getZone (), 1);! c9 k" A" f! t7 {" y
    modelSchedule.at$createAction (0, modelActions);
) ?5 M8 R7 D* R. e  p: W. ?        
5 O2 |$ D! l* {0 K% D    return this;: t" F* Z, p! Q- u: Z0 j3 R$ c
  }
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