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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:
) m2 H; B7 |9 c9 ?+ U7 t
( t5 s- \; z1 V# p public Object buildActions () {
: J4 k- _0 ]2 X% b+ }, k    super.buildActions();
( A; l! ^1 R6 t, y   
& G* a) O9 O7 ^- A    // Create the list of simulation actions. We put these in# h7 d- F; k+ ^6 [! W' O  a- M; E
    // an action group, because we want these actions to be
3 ?( M7 E3 f" B: _! x% o    // executed in a specific order, but these steps should: h, D$ [  m: H3 @$ A
    // take no (simulated) time. The M(foo) means "The message
8 }, u6 o/ s3 G% H' K4 c; x    // called <foo>". You can send a message To a particular
  m$ m9 T$ W( ^; f% x5 H    // object, or ForEach object in a collection.
# r8 R+ k2 j8 a        
2 |4 \- _% ~. h0 P0 o6 E    // Note we update the heatspace in two phases: first run
8 Q; ]. m' j9 I8 H    // diffusion, then run "updateWorld" to actually enact the
' |" j0 Q/ p' d  l* o3 G    // changes the heatbugs have made. The ordering here is
+ [: V% B6 ]/ F5 V: t& Y1 G    // significant!8 s" l: r/ ~0 \- d( c) _. ?) N
        6 x; }, j+ j7 ?' ^; q4 V
    // Note also, that with the additional( [9 I  w( T3 ^9 s( q  K* V' C
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
5 G' t7 b1 T* W# y+ K    // randomize the order in which the bugs actually run# P& d& R* g1 ]& ?+ z# }; H8 d. @  t9 P
    // their step rule.  This has the effect of removing any
8 A8 G. j2 D( i# R, |! r    // systematic bias in the iteration throught the heatbug2 ~& s& q3 ]( k7 t! B! b* S6 l; A% R
    // list from timestep to timestep5 x# T+ U7 w* l) ?
        5 Y- L7 _& @0 A% N0 X+ f
    // By default, all `createActionForEach' modelActions have
; O. b% W( Y+ r  v# w    // a default order of `Sequential', which means that the4 V4 b$ K# V1 u1 ]
    // order of iteration through the `heatbugList' will be! w0 b1 ^7 [5 d6 @
    // identical (assuming the list order is not changed* t2 A" j- X. Q8 ?* r' v
    // indirectly by some other process).
6 p$ V6 A/ `/ s; ^' `+ H! A   
5 E' k" s' O  e    modelActions = new ActionGroupImpl (getZone ());: T* R( P/ U: _3 x
- I  y" l) z& a+ i/ W* n. v$ |3 J
    try {
9 `. B1 ?! Z6 X6 n0 h      modelActions.createActionTo$message
) b7 X% C0 o$ c( \        (heat, new Selector (heat.getClass (), "stepRule", false));3 z8 e. b. k% N7 {2 P+ z6 Q
    } catch (Exception e) {$ Y7 L8 p  U) i6 c" m8 p7 S! o
      System.err.println ("Exception stepRule: " + e.getMessage ());" N9 a2 a0 j( v+ O2 @! [9 o
    }0 N5 Y+ v! y/ @: d$ z4 L) i

+ _7 P5 ?7 R) R    try {. @" B5 g* {2 v+ z
      Heatbug proto = (Heatbug) heatbugList.get (0);, |3 m& U6 _) @. I8 `
      Selector sel =
" W5 A; z4 D. K; t1 V+ l' V4 {/ C        new Selector (proto.getClass (), "heatbugStep", false);- B' _: u% U2 J
      actionForEach =
+ G+ U5 l1 U- l/ j+ T3 k        modelActions.createFActionForEachHomogeneous$call1 E+ v4 R& u8 {' Y; Q) u
        (heatbugList,5 e/ j. z$ z5 ]  Q( R9 J
         new FCallImpl (this, proto, sel,
7 ^+ M6 @+ c4 K6 J                        new FArgumentsImpl (this, sel)));
! b& G) v+ Q+ y    } catch (Exception e) {
) H. k! M) s8 T( k# T      e.printStackTrace (System.err);0 y) ^* l" u! U( N  k
    }1 F9 z# p. X3 |3 v
    ) O5 X/ [' b( y; ~. r
    syncUpdateOrder ();+ @* t: w. g' m3 o
- r! n6 {( j  V. G
    try {8 F  j8 J. D( G0 Q' H+ a7 I% b
      modelActions.createActionTo$message # Q: }1 F+ V$ @% F& j. ~7 h
        (heat, new Selector (heat.getClass (), "updateLattice", false));1 _2 @7 ?% W& D4 t
    } catch (Exception e) {) b  M# a4 j# x0 [
      System.err.println("Exception updateLattice: " + e.getMessage ());
7 |; M) K5 s- B    }
' `& s# A7 ^* C5 r. u9 n9 p        
7 W; L+ I5 G" E$ A9 T9 A% A8 x    // Then we create a schedule that executes the
8 d6 b4 W, S+ X* w* S" o    // modelActions. modelActions is an ActionGroup, by itself it
- H* n3 _3 o8 N7 n5 Y( W    // has no notion of time. In order to have it executed in
9 Y( D+ Z: b1 e& V/ i    // time, we create a Schedule that says to use the$ F7 t, Y* B. w( q# q% Q' x4 b1 [" i
    // modelActions ActionGroup at particular times.  This" [6 k/ @5 L: w
    // schedule has a repeat interval of 1, it will loop every" z) ]. O- p+ [& J0 @
    // time step.  The action is executed at time 0 relative to( C) E( k. D- u! E8 I' w3 n0 R  x6 Z
    // the beginning of the loop.
. G% d* v/ l! H
+ b/ ]* w5 ]6 Z% C& B" N* g    // This is a simple schedule, with only one action that is
) m. M8 N, T7 z5 V    // just repeated every time. See jmousetrap for more4 A. [1 n$ a; `; Q, T# C
    // complicated schedules.: q$ K3 o9 a' _9 O, h' w
  6 l! J$ }: y4 ?8 s
    modelSchedule = new ScheduleImpl (getZone (), 1);
4 q& D* K, N: @* \0 h    modelSchedule.at$createAction (0, modelActions);
: t" |; s1 {5 d9 d& R        8 T/ u/ \' B% M, [
    return this;
# B# x: z% C9 I: J5 R- U4 o  }
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