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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:
% {) C9 A' u  C' c$ T9 d+ r6 N
, c; T5 K5 q* d2 Q  W- _) t1 C, i# E public Object buildActions () {
( d+ m5 b1 n' U7 W: T8 ?5 v    super.buildActions();# P  s" l+ O$ K* I  j2 V
    ' U+ L2 D% g5 D/ C7 c  ]% C( f% N
    // Create the list of simulation actions. We put these in
/ u/ }  k  w( k( ]    // an action group, because we want these actions to be
' k9 M3 y2 @) p$ D9 g( h( e    // executed in a specific order, but these steps should
9 S( ?* O: s/ j5 {4 |    // take no (simulated) time. The M(foo) means "The message
7 S/ R: y6 r) |+ {% {8 u    // called <foo>". You can send a message To a particular
8 J2 s+ j7 h2 t    // object, or ForEach object in a collection.
- e  u( O! W& `9 u- c! W) V, [9 \        + c. R$ [7 z5 C+ b
    // Note we update the heatspace in two phases: first run1 {( y  q* L* s+ @& b+ y  \& b0 S
    // diffusion, then run "updateWorld" to actually enact the+ F0 e$ h. R) w
    // changes the heatbugs have made. The ordering here is
4 D4 K' w$ e* {/ u    // significant!4 G) s2 \/ O& r
        . D/ P" p/ ^& ]! e* Q
    // Note also, that with the additional8 b! m# R: f3 e: m) \' E& t. P# }
    // `randomizeHeatbugUpdateOrder' Boolean flag we can  O4 S9 H- _; ~2 v: t
    // randomize the order in which the bugs actually run  n- K7 j; d7 h$ z6 c
    // their step rule.  This has the effect of removing any
- O6 d& w9 x! Z! p! A2 [/ t9 R" D    // systematic bias in the iteration throught the heatbug0 I$ [! Z+ K2 _% z
    // list from timestep to timestep
6 U0 d# Y: x- G  Q7 p0 t1 P1 S% ]+ q        / H) z7 `# j& W; b; c" c& ~
    // By default, all `createActionForEach' modelActions have
1 i: J6 o! Z: {" T2 H# j    // a default order of `Sequential', which means that the
0 y6 L; q* j% T' W* `, H    // order of iteration through the `heatbugList' will be$ k; E5 n! ^. G7 n
    // identical (assuming the list order is not changed
; Q$ M7 n& k, U) L    // indirectly by some other process).
' `1 j* b* `& H5 Y9 u( S/ q- `1 p5 y- g7 J    - F& H7 m$ \1 s# }8 M
    modelActions = new ActionGroupImpl (getZone ());4 _9 E. k+ X! J' T) U0 @% b4 ~
' M# j- S( [, T4 b. Y3 I/ Q% B
    try {  E9 d9 P: M  h) C
      modelActions.createActionTo$message( B5 ^. P3 n6 `- q* T% B
        (heat, new Selector (heat.getClass (), "stepRule", false));1 R' m- Z; s' j
    } catch (Exception e) {
% Q; [# P/ T0 V) j) ~      System.err.println ("Exception stepRule: " + e.getMessage ());: z& n6 @* x# {$ c4 v
    }: b' x2 i& l) R- a

; q( A7 F1 {+ A$ q+ V    try {
0 S; _* I: u8 Z/ @8 u2 c      Heatbug proto = (Heatbug) heatbugList.get (0);# B9 c8 O- d1 b8 z) g' i! M2 p
      Selector sel =
' i5 H; @" Y6 Q        new Selector (proto.getClass (), "heatbugStep", false);; K8 D# E2 m+ p3 v; i
      actionForEach =  c# S3 ~$ }" m/ V8 O; m3 i" o; @
        modelActions.createFActionForEachHomogeneous$call. b7 j5 l' d6 [
        (heatbugList,
9 ^( `' H- c( u9 F. h- p/ |         new FCallImpl (this, proto, sel,
, X$ x  S' J2 w" p                        new FArgumentsImpl (this, sel)));% G/ {: v# b! k- T
    } catch (Exception e) {
9 \, O, H1 i5 K. o: Q2 U  [+ j      e.printStackTrace (System.err);
. L5 y5 k  T1 H0 r    }& F8 t3 `/ ~( B7 [3 L( x: r4 h
    5 J) x5 N. _7 ?% B1 l
    syncUpdateOrder ();
; y; r" ~8 O% Y) P
4 [8 H  Y! R. u5 V0 p# H    try {3 b6 J. b+ t: @$ A3 {# _$ c
      modelActions.createActionTo$message
4 S* F+ X3 y& M  I1 ^        (heat, new Selector (heat.getClass (), "updateLattice", false));
: D  L; v& `( W0 {/ s" Z    } catch (Exception e) {5 j$ |9 ~5 T. v8 ~
      System.err.println("Exception updateLattice: " + e.getMessage ());
# \. w2 I( w3 p- f" b  D! v    }
1 s) ?( ?- N7 x2 N: s' {- o        " N5 l. P3 L& s! b
    // Then we create a schedule that executes the
; ~6 K6 u% O) [$ r; O: A    // modelActions. modelActions is an ActionGroup, by itself it0 I: Y4 X1 M8 A! v* r4 r: _
    // has no notion of time. In order to have it executed in0 j+ N: L5 @* O5 k
    // time, we create a Schedule that says to use the5 c+ M0 y( g, f& D9 x
    // modelActions ActionGroup at particular times.  This" ^' g8 {5 x0 F  R7 u
    // schedule has a repeat interval of 1, it will loop every+ J1 L! Z9 j1 C0 N9 P
    // time step.  The action is executed at time 0 relative to
' D- X0 Y, w6 y6 _/ x9 q    // the beginning of the loop.! F- r$ ~/ u1 r7 K

2 D# [' _% {* d2 q4 s& f+ t    // This is a simple schedule, with only one action that is
& k8 s6 J1 z1 H% v) _5 t# M    // just repeated every time. See jmousetrap for more
4 n  f! M( I) T) o; V    // complicated schedules.
6 q, F% z  ?( I6 e  8 C1 h( \9 R& j4 o6 g: z3 C
    modelSchedule = new ScheduleImpl (getZone (), 1);
6 W; V8 u3 o2 I- U    modelSchedule.at$createAction (0, modelActions);9 `- ]% N4 K6 r. B
        
: C0 A6 O$ \" I) a4 G! l( J    return this;3 s6 E" Q& R3 V% U% U2 W0 n
  }
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