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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:# K$ [" T3 Y0 }, u6 U2 Q* R. c) s

, w/ c  o' y3 A public Object buildActions () {
) S4 f3 ?: B% c+ U/ J3 q# B% D    super.buildActions();
& T7 n! A% W, Q  z  n    # O3 t3 l/ ^, y
    // Create the list of simulation actions. We put these in
; J. C" E/ x( ?4 j    // an action group, because we want these actions to be$ b, x) T7 f! ^3 |, p: W
    // executed in a specific order, but these steps should
/ ^0 }$ N0 O9 G2 F    // take no (simulated) time. The M(foo) means "The message
& L/ U. C' ^" n# K. N: V    // called <foo>". You can send a message To a particular
2 |9 T' g& w- J: [( v    // object, or ForEach object in a collection.
# ^. o3 l% Y0 P. y: m" h- V        3 M. O, o9 [% g+ C$ w
    // Note we update the heatspace in two phases: first run- g, J2 n, y' _
    // diffusion, then run "updateWorld" to actually enact the
8 ?: n# N0 A$ I! ^$ c# M    // changes the heatbugs have made. The ordering here is
- M; W! W7 Q% V! Z! n    // significant!) x  i! ]+ m3 K# h( W0 q
        " L9 U# L% C, Y9 t) U
    // Note also, that with the additional
: u7 D$ F- E5 R# o: u: X% H    // `randomizeHeatbugUpdateOrder' Boolean flag we can0 R0 e1 Q# \* N% I6 Z
    // randomize the order in which the bugs actually run1 ~( j% ~( |( ~" C3 d3 A% O5 _
    // their step rule.  This has the effect of removing any
/ s3 _0 v3 v: n    // systematic bias in the iteration throught the heatbug5 m6 l/ {' K+ I( h, Y- I
    // list from timestep to timestep
  G/ ^* Y  E/ h$ [" z  Q7 s7 r9 z        
/ Q+ B7 l, L7 M2 ?  |    // By default, all `createActionForEach' modelActions have
5 C3 J- ^- V5 ^- r+ u& d: e5 v    // a default order of `Sequential', which means that the0 u. G3 Y; o' T3 ?. {- L
    // order of iteration through the `heatbugList' will be
6 L- c7 U0 ?8 [9 e  @& f* w    // identical (assuming the list order is not changed  T8 f4 m, o, f9 S. g
    // indirectly by some other process).
' V: x  \% H: O& K4 f+ Y, Y1 I9 m$ Q    ) d0 I0 }2 o  v( ?, {2 d- s8 Y
    modelActions = new ActionGroupImpl (getZone ());
$ I# u& A* ^- i
% y) T4 o7 x' m- {0 Y+ q- A    try {7 ]9 F% s' B* Y. y) b
      modelActions.createActionTo$message
$ t; q5 P- a9 q* L        (heat, new Selector (heat.getClass (), "stepRule", false));9 H9 ~3 g8 `3 }# P
    } catch (Exception e) {
6 W5 P+ S, |9 f5 V' u      System.err.println ("Exception stepRule: " + e.getMessage ());
4 b, z& \, x: |, r1 v& S5 L    }+ ~2 L6 @' a" ^7 o
# S4 ]1 s4 W1 P# v
    try {
% p" ?% u0 z* ]" F% b' }2 m  W# a7 F      Heatbug proto = (Heatbug) heatbugList.get (0);
$ }9 d; O" F0 }, ~. k: H5 D$ h      Selector sel =
+ j6 G  A3 a5 B: B1 k8 v        new Selector (proto.getClass (), "heatbugStep", false);
' b' m( E+ c5 W      actionForEach =
) p/ Y$ F: U4 g0 w2 H! T1 o' O        modelActions.createFActionForEachHomogeneous$call) ~; r1 Z$ I' ]* p& [
        (heatbugList,
" |& N" N. j2 I5 l3 [, g. Y% n4 r         new FCallImpl (this, proto, sel,
2 E4 |2 G9 c0 _2 g' O) A6 _- g                        new FArgumentsImpl (this, sel)));6 f! K+ d8 l4 C5 f4 t. h, m
    } catch (Exception e) {; l: M/ ^' f4 I# I
      e.printStackTrace (System.err);- @, L1 O2 |8 f  r3 k% U  _' c" C# [
    }
" z; ^( n6 O$ R$ j% T- Z# [" {2 [    2 y$ g3 _* ~1 [. r1 z' k- P1 ^. X
    syncUpdateOrder ();
1 `. s" ]% g+ B  q' ]
- g; ]9 x; S9 G! K( Z2 }    try {
" o9 `  A  |- j) E1 P2 Z( i, x      modelActions.createActionTo$message - |5 s  ^4 U6 w
        (heat, new Selector (heat.getClass (), "updateLattice", false));3 q# m% ~) ~# j8 s1 v
    } catch (Exception e) {- P# u) n7 u5 [' `0 r3 F0 m# v3 p
      System.err.println("Exception updateLattice: " + e.getMessage ());3 W- I; n: d5 n7 t. R
    }: _2 P# V$ \1 `8 y, f( }
        ) L' ?" r' J3 ^5 u! K
    // Then we create a schedule that executes the
/ }9 l/ q: U  g+ d7 G    // modelActions. modelActions is an ActionGroup, by itself it2 p  i! V( _6 p8 r8 @* |, Y: E
    // has no notion of time. In order to have it executed in3 G2 X! n0 b' f5 [7 N
    // time, we create a Schedule that says to use the
: @  }, ^- i% j. v, ?    // modelActions ActionGroup at particular times.  This
2 M& G1 C( {& ~* \1 L    // schedule has a repeat interval of 1, it will loop every
, r# U0 k7 \! e& z5 g0 J! P1 M8 s& Z    // time step.  The action is executed at time 0 relative to1 S1 |! `/ _' }
    // the beginning of the loop.: y6 O0 P3 \; }  O6 U

6 `+ j+ S6 t9 A. |& M    // This is a simple schedule, with only one action that is) C- i# K  Z$ I
    // just repeated every time. See jmousetrap for more& d( p% e* C4 j& ^7 a5 E
    // complicated schedules.
; B  S( `+ [+ S6 s0 t: R  ; l3 D* ^! S; P9 f  o  D/ z
    modelSchedule = new ScheduleImpl (getZone (), 1);" Q: G: v4 e: D( z1 X
    modelSchedule.at$createAction (0, modelActions);
- w# a' h) O/ Z1 l* a5 _  m        
3 O' L# }  i9 ?8 K! ]    return this;$ d6 J' v! c4 I9 \4 u# N) E
  }
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