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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:
3 x/ B: W/ ?- ~0 K  I9 E9 l, I0 V) k1 j
8 I* V. h) {1 l; v  p0 W# I public Object buildActions () {
6 v9 g) Y9 ~/ }    super.buildActions();% y# Z7 H. g2 C0 Y' l, f' B, Z
    ( [4 n1 q( t8 b$ \  q
    // Create the list of simulation actions. We put these in
9 w: ~9 q0 B( e& t& C. R    // an action group, because we want these actions to be
5 n. j0 t6 o# B  Y7 r% }: {    // executed in a specific order, but these steps should# u1 A$ Z  [4 s- J
    // take no (simulated) time. The M(foo) means "The message) `6 Q, a8 V* b; ]' @2 B' ~
    // called <foo>". You can send a message To a particular7 S6 X" D+ c; x, j8 h
    // object, or ForEach object in a collection./ c' L5 A5 j( z8 H( c! O' \$ ~
        
% Z4 L; V* E7 H/ e' F5 c1 S    // Note we update the heatspace in two phases: first run- [' ~; [9 U5 `6 z, b5 A6 r
    // diffusion, then run "updateWorld" to actually enact the
, v+ D( ?$ |8 l' U    // changes the heatbugs have made. The ordering here is
) R+ `) o) ^4 x% I# }3 J    // significant!
4 y- e: O' z# f8 g! `( W2 i        2 q, U1 }$ k% l" Q
    // Note also, that with the additional' S' X1 b: T! c7 b, ^  o( n
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
- P/ M$ m. a$ z' |$ X1 Y, j    // randomize the order in which the bugs actually run+ t6 R  C: L5 {' v
    // their step rule.  This has the effect of removing any% c( }. L* D$ I+ a5 k* L  b
    // systematic bias in the iteration throught the heatbug4 @6 ~* k" h9 E3 F% T8 r4 r" }4 d
    // list from timestep to timestep3 J4 U  g" [7 i
        
5 p- j  ]. J+ m! j! z3 V9 t( m    // By default, all `createActionForEach' modelActions have$ P( j4 W6 E2 E. ?6 G1 z( R
    // a default order of `Sequential', which means that the
! {. Y% T6 d: d! p) s; S+ t( p    // order of iteration through the `heatbugList' will be4 d0 u* r& z! u' c- E  _$ q! `
    // identical (assuming the list order is not changed
7 a& w' |; v0 m- Z3 A$ x; i+ n- @    // indirectly by some other process).
6 w& N# ?* [! ?9 x# m7 B    9 c: j6 G2 E+ P
    modelActions = new ActionGroupImpl (getZone ());
* S% Z5 r8 {; h+ ~2 }) A; W$ H( j* b# @3 K
    try {$ [2 t6 P% o$ f- {- N0 }* i9 ~+ [4 L6 N
      modelActions.createActionTo$message
$ Y% y$ ~; N9 W. h3 Q        (heat, new Selector (heat.getClass (), "stepRule", false));. @) x9 z5 r3 K/ o- B3 F( y- ~& e( v# O+ l
    } catch (Exception e) {% P4 a/ _/ O* u0 l7 E
      System.err.println ("Exception stepRule: " + e.getMessage ());  u3 N" \& U6 E' i3 b' J3 X5 D: S6 p
    }
4 l& @8 c% ~6 T9 I/ \* b  U4 C; z  W& l) v3 O
    try {
) Y% _9 Q1 N& y' I      Heatbug proto = (Heatbug) heatbugList.get (0);
) [% z, H  @6 I# V% w0 F      Selector sel = * q) c5 r0 }1 A8 f
        new Selector (proto.getClass (), "heatbugStep", false);6 z) S. t# p( A/ ]& s( M
      actionForEach =
( E, [" ]) p6 B4 v! w        modelActions.createFActionForEachHomogeneous$call8 ~$ h' v+ C$ X4 s
        (heatbugList,
7 I: W3 j$ G% h$ k: k! g         new FCallImpl (this, proto, sel," L: y/ G9 j- F6 s  f. U
                        new FArgumentsImpl (this, sel)));; p* R& \$ P0 S( X( L5 d
    } catch (Exception e) {
) o8 p2 w4 m# A4 U" U      e.printStackTrace (System.err);
( O, e6 y# a# r+ ~2 T4 ~" S    }
$ L( _% U8 J7 G    , R8 J; ^1 `/ S' z$ H+ }
    syncUpdateOrder ();1 @$ I/ ~* ^- z- x# {

1 `" `+ r# n/ r: w' N& j( ^    try {
& q0 \* G8 h% k# w- n      modelActions.createActionTo$message
: c+ ^2 o2 r" B# l        (heat, new Selector (heat.getClass (), "updateLattice", false));
" n1 j8 y7 _3 T* O3 H0 |    } catch (Exception e) {4 ^. V% D/ T6 `# F. v
      System.err.println("Exception updateLattice: " + e.getMessage ());
/ ?2 J1 y+ P  ^0 E8 {    }
4 I7 t- W2 l, U, e! K  w        7 ^7 D2 m# s' t
    // Then we create a schedule that executes the
8 @+ G9 N( o* b    // modelActions. modelActions is an ActionGroup, by itself it
' w9 d- `7 o, S% w% A! a    // has no notion of time. In order to have it executed in
- W2 W9 w& Q# C5 a/ M    // time, we create a Schedule that says to use the+ R7 q9 q3 b  t& w# k) k
    // modelActions ActionGroup at particular times.  This2 i1 `4 ^2 z( c' W0 B1 @% H
    // schedule has a repeat interval of 1, it will loop every
4 R! H7 y. {" o4 }    // time step.  The action is executed at time 0 relative to
1 b5 J6 Z  \& S# Y9 M    // the beginning of the loop.* P- w; x9 z% d3 O" N4 I. O. t4 i
0 w( a( k. ?6 r4 Z: ]* {
    // This is a simple schedule, with only one action that is$ H2 D* \0 h2 B( I0 Z0 E
    // just repeated every time. See jmousetrap for more
$ |% Z: x" x) E+ Y. [; i! W- G. I    // complicated schedules.
) l. M) R: e: ^# c  : V6 L" F% h1 M, _- s; V
    modelSchedule = new ScheduleImpl (getZone (), 1);
& y: w( R( @% Z# K% X7 k    modelSchedule.at$createAction (0, modelActions);: E$ F: ^3 S* G9 ?$ i1 v; A
        
4 i( T9 a7 T* J) K7 s    return this;, n' C" R! q/ `: q( Y( c
  }
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