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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:; S* `" K* d" C- B* ^9 I/ f) _- ]! Y
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public Object buildActions () {
# G: j1 J2 e5 o# ~3 M' m8 B    super.buildActions();
+ [& I+ n" |- N2 Z0 b0 F    ' |, I" B$ ^! \+ K/ D
    // Create the list of simulation actions. We put these in) x- o$ H0 d% G( `
    // an action group, because we want these actions to be8 u1 p( W- r/ L* P. u. P
    // executed in a specific order, but these steps should3 m6 B7 m0 y2 F! @4 Q, M* V1 x3 ]
    // take no (simulated) time. The M(foo) means "The message7 H5 E) U- \& U
    // called <foo>". You can send a message To a particular( F& a/ v: C! F! Q$ L* W
    // object, or ForEach object in a collection.
; k3 G' `( u6 ]        
! J1 c+ p: U" G$ G3 H    // Note we update the heatspace in two phases: first run( U3 I; }7 @+ b( ]* l( m
    // diffusion, then run "updateWorld" to actually enact the$ C; k8 t1 T( ~
    // changes the heatbugs have made. The ordering here is& t" z& v6 \* q# z
    // significant!0 Y8 ~4 x6 z- T, s3 y- ^2 u' t
        
8 e: {' j( \: u    // Note also, that with the additional
. G' u. }2 A& u+ l+ Q5 d" t6 \' d    // `randomizeHeatbugUpdateOrder' Boolean flag we can
4 q+ y  F( Q  r    // randomize the order in which the bugs actually run
$ D& I! m3 d  a% |; p' ~    // their step rule.  This has the effect of removing any5 u4 e& F, a% Y
    // systematic bias in the iteration throught the heatbug
" f( r4 R; t" X5 g    // list from timestep to timestep
/ R* l2 H/ K( D, s        
& B9 ~" M- S5 F! r$ Y6 @2 E4 L    // By default, all `createActionForEach' modelActions have+ ]2 s- Z6 x+ h) l: k1 G
    // a default order of `Sequential', which means that the
/ U- n1 ^& o* B    // order of iteration through the `heatbugList' will be
+ K2 K. o* P, T3 @5 j# @0 }4 Q    // identical (assuming the list order is not changed
9 l9 Y) E2 K/ f6 P1 U5 o! J    // indirectly by some other process).
3 ~9 W9 E* x) n   
3 W/ d' Y; [% k1 U& P    modelActions = new ActionGroupImpl (getZone ());
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    try {% k5 E$ F1 Y& U, G7 V+ ^( g1 y
      modelActions.createActionTo$message
- N; F2 X! [+ n4 U3 H9 y$ Q# y/ `% k        (heat, new Selector (heat.getClass (), "stepRule", false));6 S8 b+ Q3 n2 K1 r: z
    } catch (Exception e) {
( c  u% c$ b9 v: o( ]' p      System.err.println ("Exception stepRule: " + e.getMessage ());
8 b5 ^8 s8 B) h- O( n/ u( R6 I    }
: |" g/ i' n. E4 U& a( w3 W& w# e. k2 K+ Y, V5 l
    try {' Z8 E/ V" v* M, H* c/ r5 n
      Heatbug proto = (Heatbug) heatbugList.get (0);
8 u/ O4 `" ]5 _4 P! c) Q) |( _, P      Selector sel = , s% J. B5 x5 z9 r
        new Selector (proto.getClass (), "heatbugStep", false);9 @9 ]4 X$ |% t+ G2 e' i1 @' b* N
      actionForEach =
$ O& j! G* B4 t5 f" Y2 Q3 ?        modelActions.createFActionForEachHomogeneous$call
& ]$ f) y5 Z+ S3 Y        (heatbugList,
3 o0 d& V$ X2 L         new FCallImpl (this, proto, sel,! l0 H8 {& R1 |4 ]2 d3 L
                        new FArgumentsImpl (this, sel)));/ t4 k8 {0 L3 ~) J' j! j4 d) [
    } catch (Exception e) {
( U) j2 M8 Q8 y  F: }( [; J      e.printStackTrace (System.err);! Q% T$ ^! B3 p+ M1 x" \
    }
2 Z4 {; t5 H8 p    9 N6 i; ^7 v7 @
    syncUpdateOrder ();( J7 _" e" i6 k' U
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    try {
0 H7 M( T& `- R3 n- U9 ]4 }      modelActions.createActionTo$message , I; q  U  ]% r; H) i
        (heat, new Selector (heat.getClass (), "updateLattice", false));0 u7 \# L! p4 P4 q3 T: ~  c  b
    } catch (Exception e) {
: F, w7 @+ c% `. |      System.err.println("Exception updateLattice: " + e.getMessage ());
  X( m3 k6 _& A    }3 M, @" U; v/ X) o" {, l6 B7 R. Q
        7 f6 D1 `8 J5 {6 }
    // Then we create a schedule that executes the4 I* N% o. e8 S! d" A
    // modelActions. modelActions is an ActionGroup, by itself it9 B. S8 H  M7 R% y9 L5 ?
    // has no notion of time. In order to have it executed in
& ~5 O! I' X! m- ~+ w* L    // time, we create a Schedule that says to use the, _) {8 X3 `/ H- M: r
    // modelActions ActionGroup at particular times.  This6 V4 h) M8 j# F; c5 Y5 l  z
    // schedule has a repeat interval of 1, it will loop every- S- S; A7 _4 O: O& F& u4 N
    // time step.  The action is executed at time 0 relative to" A# k1 s: f0 Q, T: m
    // the beginning of the loop.2 v+ }9 D1 I& b* V6 e1 z
- P  X9 k9 d" P  S
    // This is a simple schedule, with only one action that is+ G5 P5 V- _9 C1 c$ r% {8 e2 f
    // just repeated every time. See jmousetrap for more
, ]& D3 u0 C5 N# `    // complicated schedules.  f- o, _' U* a( d) G. n
  
6 c; |% V# X& `/ N& G" ]    modelSchedule = new ScheduleImpl (getZone (), 1);) Q' G, B; N: c7 G# J9 ^3 e# l0 n
    modelSchedule.at$createAction (0, modelActions);- ^* j# t" Z6 v. `$ o" S
        
% p9 ^7 f7 d; t' b    return this;
* D7 X, @( z1 p! u" u  W, m& |  }
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