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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! Q; u  U7 N" t
3 g8 g5 L8 p# v public Object buildActions () {
: F& k3 T! V# v" }3 F    super.buildActions();
# C/ Z3 k, Q5 b# Z+ q+ U   
3 J( {2 A1 l; B) p8 B    // Create the list of simulation actions. We put these in
8 P+ E$ C- W0 X9 U' a1 P: L  B- I    // an action group, because we want these actions to be
, ?# r' y# O3 z8 n* \7 i    // executed in a specific order, but these steps should9 k- R3 [2 a( R0 J
    // take no (simulated) time. The M(foo) means "The message# g# R4 f% A7 C6 ^+ }2 H
    // called <foo>". You can send a message To a particular
7 ]2 Z. U6 @! p) S    // object, or ForEach object in a collection.
4 w: r. D$ h# |' V1 S  O0 {        
" D* {" R3 x" }7 m. p    // Note we update the heatspace in two phases: first run" x3 E* Y/ Q- ?; ?  i
    // diffusion, then run "updateWorld" to actually enact the0 D9 T( V6 Y7 a: U: ]! ?
    // changes the heatbugs have made. The ordering here is
  B- r: l# U3 U* q% N5 P    // significant!  P$ t0 j2 N& i5 k6 Q6 B) R
          x1 \4 j* @' \1 N' o( X
    // Note also, that with the additional
: w4 o) E; ~0 u% n$ ?" w    // `randomizeHeatbugUpdateOrder' Boolean flag we can
7 L+ \- H) C; ~: m% n) \% Z, f: o    // randomize the order in which the bugs actually run
/ y$ m4 F5 P5 }6 f    // their step rule.  This has the effect of removing any
" v) g4 U6 Q9 Z3 v    // systematic bias in the iteration throught the heatbug
" c/ d% P) ?. ]    // list from timestep to timestep
+ a$ m/ V  U6 u5 m        
* H: v' P# R( `: o% q6 M2 Z) r    // By default, all `createActionForEach' modelActions have8 M/ K2 H' F. v2 _- J
    // a default order of `Sequential', which means that the
( B' q1 S+ ?9 I7 |, S8 c/ n' _( S    // order of iteration through the `heatbugList' will be
6 q8 E% E  O2 F' o3 B    // identical (assuming the list order is not changed& t" \6 o. t; f' G7 a/ O
    // indirectly by some other process).5 c: z, g! j# K$ l4 t1 c
   
0 v8 `7 O" O& ]3 M; i6 N    modelActions = new ActionGroupImpl (getZone ());
3 g& C" [" Y7 }
; i1 g" p2 ~+ B! ?/ u, ~) \* J    try {3 g: m9 u2 C( }7 M9 V
      modelActions.createActionTo$message
( d- r1 d4 A% w! j$ ?& Z( q        (heat, new Selector (heat.getClass (), "stepRule", false));
1 a2 ?, |" G$ S, M% Q    } catch (Exception e) {
( ?* q( h$ e& Z4 o* q- n      System.err.println ("Exception stepRule: " + e.getMessage ());0 S2 L- W5 }  Q6 F. E% K
    }
# j, V3 d4 w* s, \3 j( b" r7 ^; _1 g/ \
    try {
3 a. x" ^1 F9 s0 d0 D" o9 I! F$ A      Heatbug proto = (Heatbug) heatbugList.get (0);, |! A3 V5 `1 |7 Y
      Selector sel = $ M% c( l+ \1 s7 A9 Y; T" A% C
        new Selector (proto.getClass (), "heatbugStep", false);
: Z9 V6 j4 T# j$ q5 r2 M/ W      actionForEach =7 s/ z2 v7 w% J  ^) b- _+ ?
        modelActions.createFActionForEachHomogeneous$call
$ a* V9 Z- M/ p/ u        (heatbugList,! ]( L4 s+ U. x1 x/ ]. ?* S
         new FCallImpl (this, proto, sel,/ b: c! `1 T$ U. w
                        new FArgumentsImpl (this, sel)));3 q: s, m$ q( V( x/ x, {
    } catch (Exception e) {
& o6 R4 y! G1 q1 h# z: T9 ^      e.printStackTrace (System.err);! I) L3 @5 v, g2 N& I0 i
    }% S5 V2 B# r0 y' o$ b+ h! }
    " u4 [4 r3 W2 L
    syncUpdateOrder ();
2 b/ |; O7 f3 l6 c3 D9 l
) i; K& Y, P7 J; N, I7 D    try {1 U( ~5 \' m. j& l- o( R9 ]; D0 `, P
      modelActions.createActionTo$message
) ^4 t/ S. Q* s+ N2 m" L: s        (heat, new Selector (heat.getClass (), "updateLattice", false));- f5 b6 L$ Y' {- p! Z
    } catch (Exception e) {
" j/ S9 H3 C$ i. o% R- H' F      System.err.println("Exception updateLattice: " + e.getMessage ());
& c9 i3 q' k% i" B; x8 x$ c    }
, O3 Z$ h. R) m) L: o0 J        , p( \' e% Q: o, E1 q3 {: J! u
    // Then we create a schedule that executes the
; e$ `' k0 b# @2 C) w    // modelActions. modelActions is an ActionGroup, by itself it
* d0 V, c% c$ s5 }, Q8 m    // has no notion of time. In order to have it executed in  p+ X# F; ^  f! a7 O
    // time, we create a Schedule that says to use the
. ~2 |* J5 {& q( l    // modelActions ActionGroup at particular times.  This3 P# I  b# |* v, x$ g4 Y) F
    // schedule has a repeat interval of 1, it will loop every6 O% x8 e* g. c: f$ n3 T
    // time step.  The action is executed at time 0 relative to5 r9 c+ l4 v" }( E& W. a2 q9 @0 _
    // the beginning of the loop.
3 ?1 ^% h- H6 a7 n" ~
" w3 m3 ~0 T& E: X    // This is a simple schedule, with only one action that is
; z6 {) d( @$ \    // just repeated every time. See jmousetrap for more
& K) B" T; a: M& D( p) F7 W    // complicated schedules.
' N- H% @9 O5 x* g. A6 h  b6 Q3 V; x  ' o# Y0 h/ s* O0 J
    modelSchedule = new ScheduleImpl (getZone (), 1);5 ^2 H3 N, l2 e- i  H
    modelSchedule.at$createAction (0, modelActions);
! C2 ^7 Y0 |5 A$ D' P        . c( V% K* u: i
    return this;+ O5 X& ?4 T" x# t  Z+ ~3 }/ v
  }
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