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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:
: ~+ U1 a. U! W' x1 {. }7 z6 x5 `" [* ]
public Object buildActions () {, v/ I7 N: `* R* H
    super.buildActions();0 a! X2 u+ x# {. Q
   
; V- R# u$ u4 o4 A3 u& k- B    // Create the list of simulation actions. We put these in  f  b( A& ~, [
    // an action group, because we want these actions to be
0 u; w5 x4 A7 t% G  k# S. i) e2 }: Y    // executed in a specific order, but these steps should
# F0 L/ A. w0 @, d    // take no (simulated) time. The M(foo) means "The message  L% V* }, v6 ?- S
    // called <foo>". You can send a message To a particular) }0 `" K/ P* O
    // object, or ForEach object in a collection.
, o5 L1 N& w8 H" i        4 S4 K# q* u9 C4 j
    // Note we update the heatspace in two phases: first run
8 x) x, u/ W2 O    // diffusion, then run "updateWorld" to actually enact the: q3 \" h. a' x$ L$ i+ \
    // changes the heatbugs have made. The ordering here is
$ B7 \4 S  F/ z$ B1 k$ n    // significant!" {4 A6 W# o8 @1 Y3 B
        
' K: V, K- `" D: ?' q1 }    // Note also, that with the additional
  B6 d& h  T4 |# z  A    // `randomizeHeatbugUpdateOrder' Boolean flag we can
* r- t, f2 U% S4 U+ X    // randomize the order in which the bugs actually run; _3 t( B$ w1 U0 \5 }# S
    // their step rule.  This has the effect of removing any3 f  A" @. f+ d  k+ B0 Z( {3 C3 G
    // systematic bias in the iteration throught the heatbug
, ~: B9 d  F+ t. k  o9 y+ n    // list from timestep to timestep6 f. u$ U9 y% p5 o
        
9 {' y9 U5 s/ u; X3 B    // By default, all `createActionForEach' modelActions have3 |# O5 \$ z6 R4 ?0 o: u$ F
    // a default order of `Sequential', which means that the
' G# t- n7 H, o    // order of iteration through the `heatbugList' will be
$ m  {* X5 u+ H4 q    // identical (assuming the list order is not changed
" x$ @- k! z- E6 Y/ O! h    // indirectly by some other process).! q$ v7 X  ]% l
   
9 l4 C9 ~. p7 q" S* Y    modelActions = new ActionGroupImpl (getZone ());
# q0 g4 E# r* V' x/ x8 Y! X( L. k/ r+ W8 Y4 z4 ?" P4 x
    try {$ w6 |+ b' x7 X  c, }( [8 Q
      modelActions.createActionTo$message5 o) z/ E9 p' N) C0 o. E; s% s! R$ ?
        (heat, new Selector (heat.getClass (), "stepRule", false));
% c0 X8 d" F1 g6 J: X' L5 Q    } catch (Exception e) {* Q; o, ?7 T: \
      System.err.println ("Exception stepRule: " + e.getMessage ());+ V! g, V% m2 @
    }+ W. A/ t# c5 ^0 [8 D( ?' ?

  }% b- t1 x; P5 x% ]    try {; h& N: Z% t5 _; G
      Heatbug proto = (Heatbug) heatbugList.get (0);
. X1 B7 I/ E. A3 J8 i) \1 `2 f      Selector sel =
+ U8 u! N' U: @- L# ^' r, I        new Selector (proto.getClass (), "heatbugStep", false);
  o! c/ {( r3 L0 z! \      actionForEach =2 a/ M* `* e' g2 Y
        modelActions.createFActionForEachHomogeneous$call! c1 s. v5 }! c+ {" ~
        (heatbugList,7 f0 K( b' n& @6 C
         new FCallImpl (this, proto, sel,
* [1 h! U6 r2 w  t+ G! O                        new FArgumentsImpl (this, sel)));2 _) z" w2 V0 b, E$ h: N
    } catch (Exception e) {+ F% v+ m7 }6 c& Z" v# L
      e.printStackTrace (System.err);
9 e3 v: ~: _1 [    }. r2 d9 ^+ T6 ?9 b# w
   
  o' w/ j. k( b5 S    syncUpdateOrder ();
. \: t& L: B5 T  t
5 R# {* C( g8 r6 R2 I, u2 x    try {
' {; S: }: P4 k+ g& k* h" ^      modelActions.createActionTo$message ( L& B' f& u; o! a. s: a
        (heat, new Selector (heat.getClass (), "updateLattice", false));1 [+ u0 Z( O% n9 U0 Q& ?( _4 e
    } catch (Exception e) {/ b% {5 p% O( i6 C* q6 l* V
      System.err.println("Exception updateLattice: " + e.getMessage ());
, y- L! Z! F3 F9 e9 P- _( w    }
" o+ T+ z' ?2 g$ H        
, |  ?; Q: a5 u$ v& i* W    // Then we create a schedule that executes the' O6 M3 f4 j" u" ~9 J# Q( X7 f
    // modelActions. modelActions is an ActionGroup, by itself it
  h+ J1 _, \5 T8 R+ {7 Y  Y: C* @    // has no notion of time. In order to have it executed in
7 a. c7 n* n5 t    // time, we create a Schedule that says to use the
  c: F( U5 s# H% a2 D7 x    // modelActions ActionGroup at particular times.  This+ C$ X; Z; N/ B6 k
    // schedule has a repeat interval of 1, it will loop every
2 @3 B" K$ w- b" S3 K9 ^    // time step.  The action is executed at time 0 relative to/ I, f- m$ d& d  l7 E( ^8 U
    // the beginning of the loop.$ K2 `0 r# X' Q. \

- U. j7 X' q- N) N# Z4 Y; w0 b    // This is a simple schedule, with only one action that is
, m  P% G6 J% P$ B( [# H9 R    // just repeated every time. See jmousetrap for more
6 S7 S: r% M; G  O( u    // complicated schedules.
9 m9 b5 N( k5 ^, \) G  2 ~, e% o9 B4 A+ ]
    modelSchedule = new ScheduleImpl (getZone (), 1);) j1 U+ X* E! T. x
    modelSchedule.at$createAction (0, modelActions);8 e8 b; i9 u0 q  T6 E9 B) L
        4 B1 r: ^7 w6 e+ J  J1 i  ~; Q) X. x
    return this;( U. J( P  g  R. _! _: t
  }
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