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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:
" E2 s3 z9 G. c$ o( k" y( L1 x! H4 E! [& e% h4 s% {& Y
public Object buildActions () {9 V8 x, H& c. H- Q# V! b8 o. C
    super.buildActions();
2 S  V) q7 m1 l8 o, u& i6 V; i4 O   
7 V, T2 O! l) R0 ^, a  S    // Create the list of simulation actions. We put these in
, C! l6 a7 p, z& m    // an action group, because we want these actions to be
) |/ \: d( r. H7 N    // executed in a specific order, but these steps should" u9 l/ a( {. |, g7 e
    // take no (simulated) time. The M(foo) means "The message; l( Y1 D1 F: x) ]5 _
    // called <foo>". You can send a message To a particular
4 k  y: L( c8 N    // object, or ForEach object in a collection.; R2 j( L: Z7 p$ e/ a, t
        
& _1 n0 ]6 c9 L1 v2 ~' m5 W; i- M    // Note we update the heatspace in two phases: first run
- S7 ~  ^8 `! t    // diffusion, then run "updateWorld" to actually enact the
/ ^- p1 G, @  h3 P4 u    // changes the heatbugs have made. The ordering here is+ j4 Q! v  _5 v7 M! S
    // significant!
& V4 x* Y& t) w5 c$ @+ K        5 H" P# t' p! m8 }3 g
    // Note also, that with the additional- f% U- @6 P5 l( }
    // `randomizeHeatbugUpdateOrder' Boolean flag we can$ R8 a4 S! u8 X# H) O
    // randomize the order in which the bugs actually run
/ E3 m" H- M' W9 |! `    // their step rule.  This has the effect of removing any. z) D1 i: w/ _2 R( E2 t, r  Q
    // systematic bias in the iteration throught the heatbug
* {2 v8 c1 e. c9 v2 E9 e( Z8 d& M    // list from timestep to timestep
  v( f8 f. k9 l! d. E* I7 j        ! H( d* d( M8 U% L  i3 o2 T
    // By default, all `createActionForEach' modelActions have! ?( x% L1 d3 S. h
    // a default order of `Sequential', which means that the
' R5 K' j2 F" r# O$ ^0 ~    // order of iteration through the `heatbugList' will be
. `# {# @" D4 m3 w    // identical (assuming the list order is not changed
$ V' U$ i2 m, v/ @3 Z& u1 n: R    // indirectly by some other process)./ a+ O, B0 {# \0 u& M: w
    ' w% F/ r+ ?* x, W
    modelActions = new ActionGroupImpl (getZone ());4 B2 {4 }6 q4 S" Z/ H3 [

; z- [. W6 A' W9 L3 B: x    try {% S- L! e# e- `! X! F! U7 g4 }( }& z
      modelActions.createActionTo$message
6 G' g$ |$ l$ s& K        (heat, new Selector (heat.getClass (), "stepRule", false));6 u) h0 \5 f# N# u2 [% w
    } catch (Exception e) {
, O+ ?( _4 Z+ Q9 r2 k+ W) n      System.err.println ("Exception stepRule: " + e.getMessage ());
  Z4 [" h& u' b# c/ Y    }& U( M! ^# [4 ]0 c& U9 T4 [) [
/ l: l) C4 N: g4 L
    try {
3 z" n. G- J9 }- n9 |5 F0 G      Heatbug proto = (Heatbug) heatbugList.get (0);6 R1 S9 D) E* Q* T' G
      Selector sel =
8 H# Z7 R( E0 y1 ?9 J        new Selector (proto.getClass (), "heatbugStep", false);
+ d! f0 c+ B  E, [8 B3 Q. m9 C      actionForEach =
, J9 {( K; ^  g5 I8 H; U        modelActions.createFActionForEachHomogeneous$call! ~1 ]( [" V3 M: I2 F: ?' Q4 \$ x
        (heatbugList,
. o" e8 O- i+ v. |         new FCallImpl (this, proto, sel,7 l* l  w9 }6 j- }7 P0 i  z$ P; H
                        new FArgumentsImpl (this, sel)));# L0 ?" k! v7 ]# O
    } catch (Exception e) {
& k: c3 f% ~: E; ?      e.printStackTrace (System.err);
+ [1 J2 y& X! G. M7 W. R* h1 A    }
; b- R9 Z, x$ @3 Y    # w0 R! r5 B! ]* u  C. r
    syncUpdateOrder ();
% t" T  [/ T/ w  ]- g" `/ m! y* r
    try {. v, S# F9 a& f+ \- b5 W
      modelActions.createActionTo$message
5 R% i1 ~% _- O5 U6 ?( ^: }        (heat, new Selector (heat.getClass (), "updateLattice", false));# d% T# ^1 F7 A1 @6 Z% ^8 n4 i
    } catch (Exception e) {
$ k+ L4 z& O+ I5 S" `* R      System.err.println("Exception updateLattice: " + e.getMessage ());
( A4 T0 U. ]7 q: F9 q    }
& q6 v3 H6 Y+ z! K8 \. ?        % d9 c! K* ^8 C- B4 g
    // Then we create a schedule that executes the
6 g5 s, \  Q) @1 v0 ?5 k    // modelActions. modelActions is an ActionGroup, by itself it# ], t% h: D: Z3 D6 U% i) e2 B
    // has no notion of time. In order to have it executed in) f9 K- Y1 C0 b9 ]- d
    // time, we create a Schedule that says to use the& |0 U2 n% L& ?7 d9 Y7 U( U5 `
    // modelActions ActionGroup at particular times.  This
( G6 o% R2 \5 H7 r! |8 Q1 `/ Y    // schedule has a repeat interval of 1, it will loop every
) V% z9 Q. J- f" q    // time step.  The action is executed at time 0 relative to
* T  ?* v+ _6 p5 t! l8 K    // the beginning of the loop.
2 a% i  _* L" J3 e# x1 I6 v
# K5 J! Z- c4 C& h6 H8 y( [    // This is a simple schedule, with only one action that is& _% k4 X1 a' j* X$ E  z
    // just repeated every time. See jmousetrap for more
+ Y# C9 K, W9 j8 n. r    // complicated schedules.! |: [% K1 \' l9 U9 U7 p+ j& G/ X4 p
  
5 ?  B( ]7 m* x9 W2 x" ]! U    modelSchedule = new ScheduleImpl (getZone (), 1);6 c* w. T1 C( {
    modelSchedule.at$createAction (0, modelActions);! J- K8 o( e) z( z3 u& K
        
) @1 q1 r4 @) E- n0 k    return this;
6 ^: Z: n- I% P7 a7 s( t  }
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