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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:
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' o$ u/ H6 L6 a: {$ ~. X public Object buildActions () {$ S3 v' P) {$ D  O* e; c0 k) t6 B! \  q
    super.buildActions();
& d; W; q; V; X8 |4 @   
/ N& M$ R/ F4 q  X+ f  w    // Create the list of simulation actions. We put these in  `- L' f5 W- Y6 K1 q1 ^$ H6 U7 h
    // an action group, because we want these actions to be: p6 L+ B6 V( x' G5 y4 A
    // executed in a specific order, but these steps should# O! Y! G/ d* c0 i4 }
    // take no (simulated) time. The M(foo) means "The message
! s0 j) \8 p3 V% N, i6 |' K    // called <foo>". You can send a message To a particular
/ u+ D' f' V+ F+ ~0 g' C8 [& c    // object, or ForEach object in a collection.
3 b, u$ I  ~. h+ s+ @  z3 D, J        
6 C" j( t5 V# d$ P$ J9 y    // Note we update the heatspace in two phases: first run
3 E% v. {  X+ c7 d9 a6 c8 b0 X* u    // diffusion, then run "updateWorld" to actually enact the
4 O$ t* M+ V' P4 P. k8 r, O! C9 P    // changes the heatbugs have made. The ordering here is, a9 K# ?: J- L9 U# A/ M
    // significant!( d- V6 ^3 b4 ~, Q5 P; d
        
: f/ M( I, X) C, ^* D    // Note also, that with the additional4 m& h! M; j/ A: n5 T
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
2 C) \* @" x! Y! R! @8 c" {    // randomize the order in which the bugs actually run8 K* D2 B7 F/ j4 S* W. j* g
    // their step rule.  This has the effect of removing any3 K6 M4 f/ l" r  s3 ~1 g; \3 m
    // systematic bias in the iteration throught the heatbug0 d: i# j4 T: O$ [5 J6 h
    // list from timestep to timestep
9 p6 O; g( h% L9 e        $ \- l6 h" }+ J2 m3 i0 l, g
    // By default, all `createActionForEach' modelActions have1 l% |0 y" x4 Z3 D0 l- }
    // a default order of `Sequential', which means that the
' \. p5 M3 h" E: R    // order of iteration through the `heatbugList' will be( M" F* A! P; X
    // identical (assuming the list order is not changed
5 z6 A+ |9 G; p- p    // indirectly by some other process)., \7 Z5 b' N& o3 H
    : u6 I6 t" A3 Q1 H
    modelActions = new ActionGroupImpl (getZone ());
' z- o( Y& Z% V* X& k1 @1 I' I7 g3 K5 p- n9 i1 E
    try {9 T6 L& g- C! {' u, }$ {" O0 o1 P
      modelActions.createActionTo$message; K' H4 E" k& d6 O
        (heat, new Selector (heat.getClass (), "stepRule", false));2 v6 D8 {5 i6 C' E1 ^; I
    } catch (Exception e) {
. e$ i, ?& ^; V+ s4 m4 ]0 p7 U+ N      System.err.println ("Exception stepRule: " + e.getMessage ());
, U8 P3 m7 \( j5 Z* |    }$ ^( v$ ~- |  _- r( f
6 f6 y! B. U' s$ u: c& ?0 q' _
    try {( p- x: S3 S6 {9 D) |2 m0 h
      Heatbug proto = (Heatbug) heatbugList.get (0);7 f5 h9 ^( i# _; \
      Selector sel = * x  [% ^6 f. U  T
        new Selector (proto.getClass (), "heatbugStep", false);
* m+ T9 F7 ~. @$ M% R      actionForEach =% s9 l: s8 h& Z* g
        modelActions.createFActionForEachHomogeneous$call
4 G; ]2 g4 g( D7 F        (heatbugList,
+ S, {0 s* B+ z         new FCallImpl (this, proto, sel,8 w( }: d; u8 i/ y  Z4 U
                        new FArgumentsImpl (this, sel)));
0 R/ }( A" K( t- @    } catch (Exception e) {
# z# }' Q! y/ q7 D) Q4 D      e.printStackTrace (System.err);" E$ m+ U  k; g0 M
    }
2 b- Q6 F% n( H( B   
# z0 H% x) W2 a0 B    syncUpdateOrder ();( x4 t) J+ [3 r, H9 h/ S

; o1 D0 ^9 q3 T# X, L, d6 {    try {
2 z7 c/ q( P: k      modelActions.createActionTo$message & d: B, f9 \) k  n7 x
        (heat, new Selector (heat.getClass (), "updateLattice", false));4 }* Q* a! l# V8 N
    } catch (Exception e) {; m5 Y- i% }9 O/ N; @) R
      System.err.println("Exception updateLattice: " + e.getMessage ());1 c, `' |2 C2 `, V. T) ^
    }) a& p9 @! V; E& |. i+ j
          m- k- i7 c8 n
    // Then we create a schedule that executes the- C& Z8 f' H( f
    // modelActions. modelActions is an ActionGroup, by itself it% D  G- N  m/ F6 Z% p5 H5 C! @
    // has no notion of time. In order to have it executed in1 K* [! _  A! w5 s/ p
    // time, we create a Schedule that says to use the
' i& R# \9 @7 C) y" J    // modelActions ActionGroup at particular times.  This9 x3 I; ~, v, R$ @# [
    // schedule has a repeat interval of 1, it will loop every
# z2 o8 }: q/ `& t9 _    // time step.  The action is executed at time 0 relative to
+ Q$ ~/ w" J$ \  F9 s* `6 P. l    // the beginning of the loop.2 i' B; H, t& E: @
, [. n: [9 _: k: C* W2 Z$ n
    // This is a simple schedule, with only one action that is1 ~6 l7 N( D' c1 G# h  X
    // just repeated every time. See jmousetrap for more. O5 N% B) j) L* d% O7 W, G
    // complicated schedules.
+ |2 ]/ B3 e  u1 i: t1 W" d6 G6 C! F9 v  . j4 ~- n- D' h5 U
    modelSchedule = new ScheduleImpl (getZone (), 1);
7 ~' s3 Q; |3 G' |    modelSchedule.at$createAction (0, modelActions);+ E# t9 L5 N7 P$ h/ ?4 F9 R- i. O
        : u1 k+ _- v( `$ S
    return this;% \, U/ j7 R( n3 B, b6 _" k. S
  }
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