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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:/ H+ c$ a9 V$ u1 x* g% F+ r
" w) j. b3 P2 c
public Object buildActions () {
+ A4 G9 |( l0 y% d" `4 x    super.buildActions();
3 {7 ^' a9 ~1 n, V8 a/ I/ J" ]   
, a% k8 ]; S# c6 J    // Create the list of simulation actions. We put these in
2 J/ T5 ?: l  H4 a6 }$ b# [6 t    // an action group, because we want these actions to be/ `/ m) I+ M) _  B2 Y
    // executed in a specific order, but these steps should% W, E1 p8 U$ K  H
    // take no (simulated) time. The M(foo) means "The message+ @: X! x1 O& B6 b! a5 `  |& O6 e
    // called <foo>". You can send a message To a particular. O: i1 \* w% E& k- K# a$ U1 E! {
    // object, or ForEach object in a collection." F( D, H0 ~$ I* @  A" D% h
        7 G' l# ]5 y/ ?3 S
    // Note we update the heatspace in two phases: first run
$ G: r5 h3 y9 Y' {3 A    // diffusion, then run "updateWorld" to actually enact the$ k( o7 b1 |* a( ^' r
    // changes the heatbugs have made. The ordering here is
5 R. I( v9 e1 P( r/ C1 g. a    // significant!
3 {9 \  d6 o( }/ K/ K5 h7 `        
5 [3 V7 E7 f! x* }    // Note also, that with the additional% ]0 ^; c& [0 ?' Z2 M& F5 L
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
5 h7 B" l1 ~6 i( d1 i- @; v    // randomize the order in which the bugs actually run
$ q2 D; `8 H) I- K' c    // their step rule.  This has the effect of removing any
: F8 _% k2 P$ _& V    // systematic bias in the iteration throught the heatbug
& K3 `; k6 P& x1 \6 s* k' Y    // list from timestep to timestep) Y) g6 i5 \/ @3 ]
        
% e# w' M$ S- s! A7 e1 ~    // By default, all `createActionForEach' modelActions have
6 H" h: {, `; i1 n    // a default order of `Sequential', which means that the- x! M2 D% R4 |( \* V7 ]* X
    // order of iteration through the `heatbugList' will be
7 b, K. [8 i. M& s    // identical (assuming the list order is not changed& Z. C4 N9 i7 M: q3 b) q* z
    // indirectly by some other process).
: p4 H& \& I5 Q   
& S: S. o8 q" d: @3 q6 f3 b. g2 T    modelActions = new ActionGroupImpl (getZone ());6 v7 x# t# F3 r: i, F$ H

3 ^' A% E  W' z' K4 b    try {0 w3 a4 A7 g, |2 X2 Y
      modelActions.createActionTo$message
, k6 l3 W3 |3 f9 R/ `        (heat, new Selector (heat.getClass (), "stepRule", false));1 B+ r$ g  v! u( x. i4 {
    } catch (Exception e) {8 Q. U! r* ?* {' I
      System.err.println ("Exception stepRule: " + e.getMessage ());7 `. Y: K* a1 N/ Y1 x  G. e) ]
    }
0 S. z4 y$ j% p/ s" I
' H! m- b" h3 ~" g    try {& l1 \/ v  n% |
      Heatbug proto = (Heatbug) heatbugList.get (0);
# |5 e; w- ~4 O' T' l2 A( I7 ^      Selector sel =
/ B; |; J, s+ D4 @  {6 m' o* y        new Selector (proto.getClass (), "heatbugStep", false);: @3 E( z% |6 w2 C5 K7 V. X( X) h
      actionForEach =2 u* y# Z$ }5 Z  \0 R4 a5 I2 u
        modelActions.createFActionForEachHomogeneous$call% V' i4 q. f  r* i
        (heatbugList,
! ]6 n7 {9 L, C: a  F" Y6 `         new FCallImpl (this, proto, sel,
) B5 S$ G& M) A2 C% ~                        new FArgumentsImpl (this, sel)));
& r9 e- y. q6 f    } catch (Exception e) {
3 x2 \# U  T  x6 i+ O0 c' e      e.printStackTrace (System.err);
( ]" ~, l2 M' V6 N! b    }
3 A5 f  L7 v; l3 j7 A8 Z  s      A3 i6 s% h1 ^0 E- @7 F$ |0 A) V1 z
    syncUpdateOrder ();
0 k4 M; W9 B  c! W$ W: R6 N5 K9 b' A' ]5 _
    try {$ q3 v  R: S+ d- |# F! u8 Q
      modelActions.createActionTo$message / t( z: u# E3 C) ?* Q' E5 b1 e
        (heat, new Selector (heat.getClass (), "updateLattice", false));
1 _  v9 q% w5 U- _6 P+ [! j    } catch (Exception e) {
9 t( T1 l% _( g) s; T  v' [      System.err.println("Exception updateLattice: " + e.getMessage ());0 }8 e8 J9 Q2 s0 z& `7 N- L8 J
    }
  v1 h) `4 S2 A+ J- d3 Y  t" b5 e        / k4 W& ]9 y4 a7 S! S" ^& M5 A
    // Then we create a schedule that executes the3 P. ~5 _' f4 r
    // modelActions. modelActions is an ActionGroup, by itself it
5 n1 C# M! O. @. F8 O! `    // has no notion of time. In order to have it executed in  p" `6 k' g9 U! X/ E& _- u" `
    // time, we create a Schedule that says to use the" Y+ W% c0 T% Z; L7 g
    // modelActions ActionGroup at particular times.  This
$ m  z" Z. Z7 Z; T) m    // schedule has a repeat interval of 1, it will loop every+ [8 l6 w& D/ R" b, V
    // time step.  The action is executed at time 0 relative to! `6 t" I; x3 C" U) _
    // the beginning of the loop.
) h' A  y+ I9 X+ Y2 o
4 @7 w0 l: q3 ]    // This is a simple schedule, with only one action that is; W( b1 v. [* L$ b/ g( t, p
    // just repeated every time. See jmousetrap for more
+ l, x" m5 V1 c# R    // complicated schedules.7 L4 J, ?; c# l
  
6 n$ S+ B9 A7 m$ H! T# b( r9 M8 n    modelSchedule = new ScheduleImpl (getZone (), 1);' p3 i, h. h9 Q2 [1 X
    modelSchedule.at$createAction (0, modelActions);. L5 j- A% i  t% g/ v2 n
        
" N0 z- l2 F$ L: F* r9 a    return this;
5 g% V/ d) D. c! A- I& J2 d  }
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