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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:
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public Object buildActions () {& N& V& V0 X( t8 O# U4 h
    super.buildActions();5 v. I1 z$ `8 H4 J# n
    % x( `7 C0 k. {$ ^; P  f$ N
    // Create the list of simulation actions. We put these in
$ Y1 W0 X1 E& U4 C' j5 t    // an action group, because we want these actions to be
1 S: C* D0 C. Z' j# {( q* Y    // executed in a specific order, but these steps should+ x) B* n  E( C! ^" {
    // take no (simulated) time. The M(foo) means "The message' A! s2 f; M" }& n
    // called <foo>". You can send a message To a particular
$ R- j& v* R: x9 s' L    // object, or ForEach object in a collection.) y$ G! O5 }. b: w( e
        
, ~+ v" }7 l, V7 [$ O, Z    // Note we update the heatspace in two phases: first run5 j1 i) g7 i, S, G
    // diffusion, then run "updateWorld" to actually enact the
) ~/ x. Z2 E0 ?# ^/ l' T    // changes the heatbugs have made. The ordering here is, z) l& R* l; I4 L# l5 f
    // significant!
& H( `% G: y$ |) \; x        
' C; c1 n9 v; Y5 J! G" i    // Note also, that with the additional+ Q( ]. t( L! X  ]5 s
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
) H/ W3 q) o: L. t    // randomize the order in which the bugs actually run
6 s+ m+ x" r9 v1 a# h* U    // their step rule.  This has the effect of removing any
5 A- J2 N4 k# f$ f& D7 h1 r1 q  z    // systematic bias in the iteration throught the heatbug' `; W' h) M% A; V( P/ b
    // list from timestep to timestep% x1 q+ j' \5 I" \7 e
        
# `" }! x/ A* u2 _4 g% Z0 s! i& g    // By default, all `createActionForEach' modelActions have' [; ~- g7 t% ?$ W2 z# |
    // a default order of `Sequential', which means that the
' v4 L- X2 _% F) I1 h& o    // order of iteration through the `heatbugList' will be
$ s+ f5 Y( S1 v* b- @6 O    // identical (assuming the list order is not changed
) H4 U8 B: a0 B6 j3 |6 Z1 W    // indirectly by some other process)." Z* ?. J& x8 D2 C( v- a5 @
    ) f  I8 ?, O4 M
    modelActions = new ActionGroupImpl (getZone ());+ i1 q; I/ z& |! d7 [5 t

# E- |1 I; a7 P    try {
/ u0 ?' R6 G7 T/ m' d1 l: \" G      modelActions.createActionTo$message/ i0 b3 R; C' |7 r3 ]
        (heat, new Selector (heat.getClass (), "stepRule", false));- o) ^' ~4 O6 B9 _7 B: j
    } catch (Exception e) {
* U$ o/ e6 _2 ^" f( L" d. o0 G      System.err.println ("Exception stepRule: " + e.getMessage ());
& _$ |3 R+ ]8 g    }: r& Z& p& I0 ?; j$ D
6 I7 c, t' b$ N# f; @4 M
    try {7 f8 T# [) G# U( a) F; L( [
      Heatbug proto = (Heatbug) heatbugList.get (0);% P  q) ?3 M2 F* u, R8 l( m2 t
      Selector sel =
/ G2 x3 X( ^7 s" `        new Selector (proto.getClass (), "heatbugStep", false);) y  j) K6 P$ {+ o4 M' ]
      actionForEach =
* e# E, @# c, ~9 u# X        modelActions.createFActionForEachHomogeneous$call* F. v+ _. O% y. z
        (heatbugList,
, I! ?0 d! Q' C$ S& Y) F9 J, |2 t         new FCallImpl (this, proto, sel," t5 ?* a4 w5 ~2 U& M, G0 ~
                        new FArgumentsImpl (this, sel)));
: A8 w; W( P5 L' [) @9 Q# u! s    } catch (Exception e) {0 K1 ?* G) O* t  c
      e.printStackTrace (System.err);0 e6 U( O. O, S: f& g4 @
    }
0 I3 c# j& B. ?+ a! M: M5 b    % [+ V( q7 M5 E) `; P& ^
    syncUpdateOrder ();; o* I9 K/ Z# r( |+ {1 f6 z
. A+ V. L( X8 \5 Z7 }
    try {
+ E1 @8 K- }" k6 k# C+ Q+ l" S5 ?      modelActions.createActionTo$message
3 G8 V5 P- m* h, G9 d        (heat, new Selector (heat.getClass (), "updateLattice", false));
4 [* f3 Z8 s0 ?) ^: n    } catch (Exception e) {$ y# ?3 a, g/ e' f) S/ C
      System.err.println("Exception updateLattice: " + e.getMessage ());
' [+ V2 b" y: A8 T+ ?    }. ]5 K7 `3 j# l" r$ H! N1 ]. {
        " Q: f( O1 s8 |- q
    // Then we create a schedule that executes the
5 J5 ~. P/ z" B% R& p/ H    // modelActions. modelActions is an ActionGroup, by itself it0 ?) m9 \/ I, [  ~" j: H
    // has no notion of time. In order to have it executed in4 \" f# d/ a" _7 `( V
    // time, we create a Schedule that says to use the
4 @. @3 O8 L# f6 C# d$ m1 H$ f    // modelActions ActionGroup at particular times.  This7 j/ H; d1 B( x0 c
    // schedule has a repeat interval of 1, it will loop every
! L( }1 f- f$ `1 I6 N    // time step.  The action is executed at time 0 relative to/ y9 y/ R$ y3 U; J7 r
    // the beginning of the loop.
+ U3 J( \. V2 M6 p; a9 Y0 K- V/ m( \9 c5 N. U, u- }$ o. h; [
    // This is a simple schedule, with only one action that is! T) w) q) }8 M: a7 k' ^/ I2 x
    // just repeated every time. See jmousetrap for more
9 i; ^5 e# ]) o/ }  u, [    // complicated schedules.
' Q  h4 w" j3 Y: {( k1 p$ |  
" x- [( H) g, B) z    modelSchedule = new ScheduleImpl (getZone (), 1);+ T  w9 D6 H% l; p- S" l
    modelSchedule.at$createAction (0, modelActions);
/ K- B% q2 G  W7 ?        ; I' Z" G! e. E
    return this;0 ^$ [8 W6 x7 v8 c8 a
  }
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