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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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) T6 r1 l7 ~. v, L/ \ public Object buildActions () {. [- ^" m6 Y% c  M" L( z2 h
    super.buildActions();
4 t6 s0 p% ]4 m% q- }   
. f  L  a7 ~  S    // Create the list of simulation actions. We put these in
$ D- q  u2 U, o  {; x1 \$ @    // an action group, because we want these actions to be. M- X% {8 C& Q0 b- |& N
    // executed in a specific order, but these steps should( j$ q9 j8 H3 H5 o- t
    // take no (simulated) time. The M(foo) means "The message( N9 n. F& _, e% b
    // called <foo>". You can send a message To a particular8 H$ i1 j6 W" T( d! n
    // object, or ForEach object in a collection.
% y  s/ d: \, b9 x: f" Z        , C2 b% y/ v6 N5 I2 s
    // Note we update the heatspace in two phases: first run+ }/ O( O" l: o5 Z
    // diffusion, then run "updateWorld" to actually enact the8 w: E6 z- G7 w# \. {
    // changes the heatbugs have made. The ordering here is; |' Q& H0 t; y
    // significant!
# O8 `5 y# [8 T2 H* u! S  n+ g( w        
0 X7 i% Y" F( l$ o! F8 t' }1 x1 t    // Note also, that with the additional1 B9 i* Y2 n) L, F- u
    // `randomizeHeatbugUpdateOrder' Boolean flag we can1 Q. ]- d3 U, e1 v: g
    // randomize the order in which the bugs actually run
8 _2 [; A- V; g6 @    // their step rule.  This has the effect of removing any8 Q8 I* k$ ~8 D
    // systematic bias in the iteration throught the heatbug% q) Y9 V; ?# d6 U9 K  ~
    // list from timestep to timestep; F4 ?0 \  ~2 l7 ]3 Z$ A
        : l1 p0 n0 A+ d: P2 y" ~' V+ @" r
    // By default, all `createActionForEach' modelActions have
* g' v/ G" o, q) |3 i2 ~    // a default order of `Sequential', which means that the
* E: j* c2 n: {+ u    // order of iteration through the `heatbugList' will be
/ W7 z7 H4 O) D7 @8 ]* F+ g* X    // identical (assuming the list order is not changed0 M4 A. C2 D7 a$ t* b8 T
    // indirectly by some other process).
% p- M% a7 y8 y" a: ~   
: F4 A6 i8 A. _9 M    modelActions = new ActionGroupImpl (getZone ());- C7 ]/ G$ M" p: J0 v& x, }
' d6 `0 p+ H$ ?3 l$ V# i) _' F9 W
    try {9 q" q; y  i  I' C( G/ J& [6 I
      modelActions.createActionTo$message
) x# T5 J) C$ L! i+ r, [0 ^        (heat, new Selector (heat.getClass (), "stepRule", false));2 R) L1 _7 |/ Y! f+ G* j
    } catch (Exception e) {1 v% I" w$ b$ ?8 w: K0 P$ c
      System.err.println ("Exception stepRule: " + e.getMessage ());
3 o0 w7 B9 G6 P$ d; P6 Y    }
: K+ m' k. b9 U( A2 r( I* N: i# Z0 t/ v
    try {
# ?  _! o/ ~- ]+ t5 @/ Q      Heatbug proto = (Heatbug) heatbugList.get (0);7 a" |: F4 E( ?3 Q0 L, x) Y& R
      Selector sel = 6 \* }) `6 J5 K7 i9 Z; d8 Y2 G
        new Selector (proto.getClass (), "heatbugStep", false);2 w( r2 Y- |# J" T& v+ D+ K$ }
      actionForEach =
& _3 e7 a7 I: y' A! @6 b6 L5 ?        modelActions.createFActionForEachHomogeneous$call
; o7 d$ }' Q3 f9 g) A  c3 ]5 X        (heatbugList,; a, L9 z8 m8 o3 _6 |
         new FCallImpl (this, proto, sel,/ ~! f/ K3 m4 W/ O8 n
                        new FArgumentsImpl (this, sel)));4 c, h$ y6 [" |2 e8 ^) B
    } catch (Exception e) {$ D1 G" }7 P; U/ I1 Q7 E, u! G. E
      e.printStackTrace (System.err);
% f5 V" E; T: v. i8 ^: A( F, d    }
, ]  a) K, v8 o# L    1 _8 t) S4 u3 C7 J
    syncUpdateOrder ();! d7 _& |% o" k& T- k! c

' v' d7 G+ R$ z1 u& v    try {
* [6 L1 C1 x; f) G2 i' @+ G      modelActions.createActionTo$message ! j3 ^/ i) W$ P) ~3 I
        (heat, new Selector (heat.getClass (), "updateLattice", false));7 [4 @# K% s8 L3 P; S& l8 ~; m
    } catch (Exception e) {; l) L) w# N( w! k6 A* Z
      System.err.println("Exception updateLattice: " + e.getMessage ());8 [+ A  z  N& U% n7 _; `
    }, Q$ r* h$ f$ B- u& Q
        2 E. L( B  r+ n) W2 G
    // Then we create a schedule that executes the
# \5 [. |% ]' e" e# Q. @    // modelActions. modelActions is an ActionGroup, by itself it3 a9 |2 w' {( B+ Z, |6 b6 y9 G- t
    // has no notion of time. In order to have it executed in" y' b( l' U4 x/ f! R. b! B
    // time, we create a Schedule that says to use the% |; I# L5 ?- I0 a* y  k% ^
    // modelActions ActionGroup at particular times.  This* \! ~8 ^* t9 \2 ?0 y
    // schedule has a repeat interval of 1, it will loop every0 Y" H# Y3 Q6 v) D9 t
    // time step.  The action is executed at time 0 relative to, Q6 k8 l/ W% T* P. s
    // the beginning of the loop.
+ h% T3 g# W+ _! i3 x% F& o; C* m, D) G# ?
    // This is a simple schedule, with only one action that is
3 `0 V2 @  U- i5 R* j8 Q" v$ o' X( }3 `    // just repeated every time. See jmousetrap for more
2 T, Q* m$ R) F8 `/ l0 i5 |    // complicated schedules.
+ r  n5 ?3 K" E  ( z; F4 C  }, }3 z9 E2 ?
    modelSchedule = new ScheduleImpl (getZone (), 1);
; r+ |% `& c) b0 n7 X! W1 o    modelSchedule.at$createAction (0, modelActions);
( _2 A* b4 H2 A( w" `2 w        
7 z& |1 t& S# z9 _  a9 F" F    return this;
" W$ \& j  o0 j8 f' \, e" [/ c' J  }
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