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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:. J. X9 E! J4 ?

/ ?- O' y; d! ], ?! ?& F* Y0 f, U public Object buildActions () {5 U8 l/ {( g2 s" b) b  u* \' V
    super.buildActions();  i9 P8 O( T4 I( G$ R
   
1 v  y& K' n  j/ R2 p4 V    // Create the list of simulation actions. We put these in2 ~4 n5 Z9 f+ s: b8 Q- E/ s9 J
    // an action group, because we want these actions to be6 ]. U* P5 X$ S* z
    // executed in a specific order, but these steps should
6 L/ P2 s" k" @8 l/ S/ \    // take no (simulated) time. The M(foo) means "The message4 C  x8 z( Q) f& b+ p) k' Q
    // called <foo>". You can send a message To a particular5 n" y; |, B5 R# s* G
    // object, or ForEach object in a collection.
" ~2 ^' B* g7 L6 F        
. o% a! \. t; l6 ~. E    // Note we update the heatspace in two phases: first run: E2 T4 m+ Y9 B- X3 t
    // diffusion, then run "updateWorld" to actually enact the
) X0 M. h& t1 @) w% `/ W    // changes the heatbugs have made. The ordering here is
0 a% \) [7 K2 P# C; _$ f% w% @    // significant!
! v; v* ~0 F: ~+ C        
6 C# Y# e; c4 ~2 k( P  V" ~: \6 o3 l    // Note also, that with the additional6 U# r+ a2 {$ {
    // `randomizeHeatbugUpdateOrder' Boolean flag we can! a4 T% x* d  `( ?
    // randomize the order in which the bugs actually run
# Z+ ~- ^# v# I& Q/ i: B    // their step rule.  This has the effect of removing any/ f, B: D0 h$ G$ R& b% D' i
    // systematic bias in the iteration throught the heatbug
6 u. r: C* R) h" t5 o: z6 b% J5 P    // list from timestep to timestep# u# r2 O4 {8 J7 N
        
0 y+ C2 v: R4 i, b* @9 _% e8 b    // By default, all `createActionForEach' modelActions have
4 @: f2 Z! Y) L3 O. i    // a default order of `Sequential', which means that the3 W6 w) Y  C, D" ^+ w- q
    // order of iteration through the `heatbugList' will be
$ R+ K% v! w4 F+ {    // identical (assuming the list order is not changed$ m* C) G& N$ |5 E$ b' {5 @
    // indirectly by some other process).
, l: A1 w9 {" r+ M& Q  O/ p   
: y  Z2 ~; J; v0 p  C$ L  E' N    modelActions = new ActionGroupImpl (getZone ());, b8 M) t. u" e8 l" j3 ]' Y

8 g+ \+ U- t6 b0 B7 Z) ~    try {
; q/ f" A8 M1 j      modelActions.createActionTo$message( n; a9 u# J& }" I0 k0 f) l1 D! T  R2 ?
        (heat, new Selector (heat.getClass (), "stepRule", false));
3 Q/ ]# g* c& n8 ]( i    } catch (Exception e) {4 `. p+ ]' O1 }( o! D
      System.err.println ("Exception stepRule: " + e.getMessage ());
7 `: k. j  s: D8 v( [    }. ~. o; b- _4 ^
- x- z9 ^/ I8 G
    try {1 r, n. _& \9 w8 A; ~* }2 i
      Heatbug proto = (Heatbug) heatbugList.get (0);" [) q  B/ A% O7 l8 x9 `( W" R
      Selector sel =
, M5 @) o3 o5 b6 F8 M        new Selector (proto.getClass (), "heatbugStep", false);2 _9 u6 `. o2 @
      actionForEach =
8 D/ P4 P5 [7 Z! B. F/ @        modelActions.createFActionForEachHomogeneous$call' {4 H) j! X0 {* _8 v' A* P2 K, ]
        (heatbugList,+ G6 W7 j% a, H. u6 z
         new FCallImpl (this, proto, sel,
. \7 }' B$ K1 V" j4 y                        new FArgumentsImpl (this, sel)));, |: a) T/ ?1 z4 S, d9 B. ^# i0 J
    } catch (Exception e) {# T4 [$ d  X# N, Z
      e.printStackTrace (System.err);
# U; d5 t1 ]* Y2 z9 S! o8 y& q( @    }; s; `& V: h" X7 g6 N- W' [
    + ?+ }; I  ]1 S6 j. J  a
    syncUpdateOrder ();* T4 p( y* @0 B( Q* D
6 f' ~0 n& o0 V
    try {
% }+ N1 B; D# Y% {; d7 ?5 y      modelActions.createActionTo$message " b$ S# h( M7 m" B2 s
        (heat, new Selector (heat.getClass (), "updateLattice", false));3 M& f9 n! R8 v4 v3 [
    } catch (Exception e) {7 ^% [  A# q$ Q6 c+ ~2 p7 ?
      System.err.println("Exception updateLattice: " + e.getMessage ());
* w. T0 m8 E+ j# u$ V    }3 N) ~9 u7 b) ?9 @
        8 \. O* a; w( {+ j& Q+ I, U4 _% a
    // Then we create a schedule that executes the/ ^* X" F* K) ]* ~# d1 u
    // modelActions. modelActions is an ActionGroup, by itself it3 a* b8 c5 J/ @
    // has no notion of time. In order to have it executed in% a+ ~! a# E3 W: }( y/ b- p
    // time, we create a Schedule that says to use the
/ |% a* c  K* s0 [# m    // modelActions ActionGroup at particular times.  This
* W+ h- q9 T$ |: b$ e    // schedule has a repeat interval of 1, it will loop every
6 e& l, L. g3 M6 f    // time step.  The action is executed at time 0 relative to4 u* h* [+ T! L8 ?
    // the beginning of the loop.# h3 {7 c* v) ?

4 u8 E# C2 U( v$ n! J    // This is a simple schedule, with only one action that is
& ^$ Z. \1 w3 ?/ w' p8 Q9 o    // just repeated every time. See jmousetrap for more
* k2 a; c! \% ^0 M0 z) ^    // complicated schedules.! s& K4 t% u) ~2 x3 n
  * `1 v' K" u' o* d* H3 w* c) v2 ?
    modelSchedule = new ScheduleImpl (getZone (), 1);& P' l8 c/ C2 T5 J5 _( v! `( H! o
    modelSchedule.at$createAction (0, modelActions);
" `& O+ v  i. i! f  t          K6 B3 u" R# A) }7 j) W+ l3 C
    return this;$ Q& y6 T& Q$ W4 V9 _" f4 K
  }
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