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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:  B4 T1 D9 O$ w! g
3 [  S# h2 j) `: \5 ^9 V' G1 x
public Object buildActions () {
+ A' b' ^& y7 j! ]: r7 \    super.buildActions();+ N$ c$ h) M: K
    9 L8 K. B, c! B, D9 f# H$ ]
    // Create the list of simulation actions. We put these in
  s* E9 u0 N7 @- v: m    // an action group, because we want these actions to be
: O- }+ l/ ]  P6 r7 {    // executed in a specific order, but these steps should
- r- A' x0 ^1 [# Z    // take no (simulated) time. The M(foo) means "The message, d6 [' G1 y6 X0 r4 E4 g0 G- c
    // called <foo>". You can send a message To a particular
) a3 t7 `8 \' F    // object, or ForEach object in a collection.- C  h8 o7 u. D% J- C
        
2 g0 u. E6 J5 k5 r    // Note we update the heatspace in two phases: first run
9 D" M0 b- C& g    // diffusion, then run "updateWorld" to actually enact the
9 C$ ~% k- w; z' C( o" J; z5 t2 U    // changes the heatbugs have made. The ordering here is
, X1 N3 N  N) J1 O& z9 N    // significant!
6 \; a5 ^8 {- l; ^        
5 q1 _# @, o2 E3 \    // Note also, that with the additional
7 Z8 S' ^- P7 U6 \    // `randomizeHeatbugUpdateOrder' Boolean flag we can  {" R( e3 L' z9 n
    // randomize the order in which the bugs actually run, \! B+ x5 l; [& A( x
    // their step rule.  This has the effect of removing any! B! g+ @0 n1 S- ]+ ^5 `/ l) z, G
    // systematic bias in the iteration throught the heatbug
& l* N) P/ Z! y2 k- B4 E7 p! Q    // list from timestep to timestep
' a  }# b) Q! u* g% D  l; e9 j        ; Y; g( A* S& T8 l! d8 X" b
    // By default, all `createActionForEach' modelActions have. F9 S# U: P0 A& J: ~: K9 ]# v! S* g
    // a default order of `Sequential', which means that the" `$ Y$ j* Q1 ^( J; w, g
    // order of iteration through the `heatbugList' will be9 e6 k/ u) b7 M; J2 h. L
    // identical (assuming the list order is not changed
0 H  b  E6 j/ C* o# x+ O) @# W    // indirectly by some other process).* k& Y+ u7 R' O* \
   
: n9 a. ?6 A% b7 p, m+ o  x    modelActions = new ActionGroupImpl (getZone ());" y) P2 K+ R7 t1 j$ `# x6 C
& i, o/ I6 U7 O+ j& M
    try {' [- v3 Z4 _, ?5 e0 o* w
      modelActions.createActionTo$message, v$ ^1 V# S  v  j* ?# Y
        (heat, new Selector (heat.getClass (), "stepRule", false));0 V  R0 u4 ?$ x6 K; Z. I" a' ]) X
    } catch (Exception e) {4 a4 L- }' S0 N" q: t- Q
      System.err.println ("Exception stepRule: " + e.getMessage ());
0 q- E! z1 n+ A/ }# g    }; u- {! N/ B0 ?' B
* H6 D  l- x, r& a' i6 N* @% f
    try {) X7 ?8 w% S$ Y  n/ d6 s4 K* E
      Heatbug proto = (Heatbug) heatbugList.get (0);5 o4 U* Q4 a; o3 r7 ]
      Selector sel =
6 K. z& l$ [9 L- h        new Selector (proto.getClass (), "heatbugStep", false);0 l3 u) B8 n: n4 G+ G/ U! Y4 e' K" t
      actionForEach =0 N  i6 t$ V) ?1 p) i1 _  l, l
        modelActions.createFActionForEachHomogeneous$call
; U  k3 B: ?. V4 L( s2 G8 }, H        (heatbugList,* H" x, J0 T# P, |
         new FCallImpl (this, proto, sel,  p, i: X, C1 {; ^& C) O( g
                        new FArgumentsImpl (this, sel)));
3 _" s% y2 ?3 L2 ?0 X: _" ~    } catch (Exception e) {7 ]0 H0 [' i1 Y/ w) d9 h3 `
      e.printStackTrace (System.err);, T2 K" \! s) W& z# O
    }( M; N& M% i# _& s
    + |9 I7 ^: |5 {, W1 o) {* }
    syncUpdateOrder ();% L- d( B9 x3 @! H- [+ D
' G2 o+ t. \( n& E( {8 H4 [, V
    try {# g3 @& U0 N% r( V  S
      modelActions.createActionTo$message ; y7 \1 l& `, Y7 u9 S) O
        (heat, new Selector (heat.getClass (), "updateLattice", false));3 s8 _1 T7 H' f/ S0 {+ b) }' Z6 E
    } catch (Exception e) {+ K. L7 r: U( I! E  u4 S
      System.err.println("Exception updateLattice: " + e.getMessage ());) o- a1 ~$ H" A
    }9 P& f; j( g$ K$ t8 e$ {; C8 x7 K$ i- A
        
4 A9 E  [( c/ @+ c8 \6 W* N% m    // Then we create a schedule that executes the" x: e( ^+ q, O2 L
    // modelActions. modelActions is an ActionGroup, by itself it
1 u+ @$ s* B) z/ E# H3 k" ~/ H2 X, @    // has no notion of time. In order to have it executed in
' @1 _: X! z5 Z    // time, we create a Schedule that says to use the
# R+ ~# g* r  j! N' Q  F# T    // modelActions ActionGroup at particular times.  This
% J6 |' v" Y) Z4 C! ?, X) O    // schedule has a repeat interval of 1, it will loop every
& V6 D, o% u+ z5 q    // time step.  The action is executed at time 0 relative to7 l+ k# ]% ~+ g0 J" ]0 Q+ l% T
    // the beginning of the loop.
/ P9 r" x9 @( i! X  e" m2 y9 H5 ~4 c. K& i5 f9 W* t  y
    // This is a simple schedule, with only one action that is8 u: n$ _7 `# B
    // just repeated every time. See jmousetrap for more' N. |7 A+ f. ~# A8 z- {* G/ w9 h
    // complicated schedules.! S( n# O' X: k6 E
  " |6 C; L, V3 I& {  ?0 z
    modelSchedule = new ScheduleImpl (getZone (), 1);
% k/ u' U9 r$ o    modelSchedule.at$createAction (0, modelActions);! H; m: C! ?# a1 B4 w
        
7 S  ?* o8 D9 J    return this;7 V  L4 z, s# E- D# b8 w& u
  }
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