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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:
: ]  Q8 r& ?% }' }: D- M: q7 V( y1 v& F( x( K
public Object buildActions () {  k* T8 R; Z' m( [& O' A
    super.buildActions();/ S* w4 j* N( R. u" [
   
$ \7 c  A* t- m  q2 x' Q7 G6 l9 f& S    // Create the list of simulation actions. We put these in
, t8 x" N. b- ^( J4 w+ H' o0 Y+ H$ j    // an action group, because we want these actions to be6 }6 P  H, r  I8 K3 a$ Z0 d2 Y
    // executed in a specific order, but these steps should
9 f9 B6 F4 a3 N2 \& _    // take no (simulated) time. The M(foo) means "The message
+ |- z/ |/ [3 ~1 L    // called <foo>". You can send a message To a particular
- e) |8 x. b( N4 G! p8 w3 W3 R    // object, or ForEach object in a collection.( G! @1 d9 E. b8 L
        
; h9 [1 Z+ M* B8 b    // Note we update the heatspace in two phases: first run
% b" t- M/ O) v2 M, ~    // diffusion, then run "updateWorld" to actually enact the( _, @. T; b; f! p
    // changes the heatbugs have made. The ordering here is
4 P- R! K* X+ f% x( o+ Q    // significant!
2 x( s. z7 h; R3 j+ b5 c: a        
$ |' z9 f- j% d6 Z/ |6 {    // Note also, that with the additional- e4 R: `- V; n) p
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
! S/ ^7 S* S6 c5 N) n0 x    // randomize the order in which the bugs actually run
) o. t% \) ]) |    // their step rule.  This has the effect of removing any+ d0 H; O6 J/ u6 E
    // systematic bias in the iteration throught the heatbug7 ~2 G9 u- B* U8 t# q
    // list from timestep to timestep9 x8 N0 x; W: Q# K
        
4 i9 i. S4 B+ \  s9 V    // By default, all `createActionForEach' modelActions have/ w( x, J+ _# u; y
    // a default order of `Sequential', which means that the; ?# F  Y% S/ B4 q' p; S/ P; v
    // order of iteration through the `heatbugList' will be8 T* m# p6 Y% {+ u2 m* p+ d( p
    // identical (assuming the list order is not changed
' i# U" G' o$ M    // indirectly by some other process).
! Z# a" C- n! v! y; t! }0 \! E    ' {% ^+ P& d* E3 U0 }. S4 @
    modelActions = new ActionGroupImpl (getZone ());2 h2 f, u; y8 z8 J

8 a2 v# G8 g' ^5 ^    try {
' B$ ?5 O+ ^& r' ^5 H      modelActions.createActionTo$message
% k8 K& T! `, k: p        (heat, new Selector (heat.getClass (), "stepRule", false));
7 f. _: j0 |0 v# f8 c- F    } catch (Exception e) {
7 r+ b) c  k- E' ^, u      System.err.println ("Exception stepRule: " + e.getMessage ());
9 x/ h% {4 K7 `) @: g- d    }
. Y  _4 L: w5 L2 D
& \8 v  m; d% N2 {# }8 L1 _    try {" ?* q5 O( D; p6 @7 y1 J
      Heatbug proto = (Heatbug) heatbugList.get (0);
0 i& ]6 r5 C( F5 z7 g      Selector sel = % E, X7 _, u* ?' r4 N
        new Selector (proto.getClass (), "heatbugStep", false);9 L) U: L2 o+ F" v  o  `
      actionForEach =* h) L  w! c5 b. k
        modelActions.createFActionForEachHomogeneous$call
0 M) O8 y" k6 L5 {2 A2 i  Q        (heatbugList,
0 f5 S; j4 j& I         new FCallImpl (this, proto, sel,
) Q3 ]' Q6 `; V0 f6 y/ @                        new FArgumentsImpl (this, sel)));
0 g0 _4 I' P1 k# M8 F  i- B$ ^7 D    } catch (Exception e) {
+ P. X* i4 a( d: B" B2 A7 I2 k3 W8 H      e.printStackTrace (System.err);' f& Y5 m# O6 M" _3 t: @9 t# i
    }9 U; F" S, \1 h; `: ]
    5 ?2 ]. p: r( l3 N
    syncUpdateOrder ();
; ~. _0 K  W( {# E* t0 ]; X9 ?
: X. J9 ?1 ~+ c/ t    try {
% B/ [3 ]% f! E9 i  z' S# ~3 w. m* A      modelActions.createActionTo$message
- H7 V' W) m/ p8 k: @; I! K2 R% @) P        (heat, new Selector (heat.getClass (), "updateLattice", false));) Y, n5 [* q8 B7 {
    } catch (Exception e) {
$ w5 r- H; m( [# ~      System.err.println("Exception updateLattice: " + e.getMessage ());
9 Z9 K. `% I) o) [: S6 v+ U    }
' ]( i7 a2 V5 _* |        ( j' g" a0 T' Z0 w
    // Then we create a schedule that executes the
% ~; _) c( L) e' M% n* i. h    // modelActions. modelActions is an ActionGroup, by itself it
3 t6 R9 F) x# k5 d' m1 h    // has no notion of time. In order to have it executed in7 b8 z9 P. z3 S+ y0 V
    // time, we create a Schedule that says to use the! c" O; f  w8 N, Z  X6 c4 k5 z. ]
    // modelActions ActionGroup at particular times.  This
$ L" M( n3 F4 ~" K. s; n8 H    // schedule has a repeat interval of 1, it will loop every; L1 x. E8 \9 A: G+ T
    // time step.  The action is executed at time 0 relative to2 w1 E6 Y' X% [/ d* o& i; e
    // the beginning of the loop.1 ~. k+ O( `0 I0 O0 X& Z% s

( t% I/ a$ H& ]5 p$ h    // This is a simple schedule, with only one action that is
% D  J6 m# U1 E4 E9 \7 g6 x$ U    // just repeated every time. See jmousetrap for more
6 w2 L2 n3 B0 A    // complicated schedules.
9 k5 @2 c, v, Y! \: Q0 g6 Y, G2 U; q  
2 B! h" j; [0 A. [" O    modelSchedule = new ScheduleImpl (getZone (), 1);, z& F/ A# \) L: v/ r7 G
    modelSchedule.at$createAction (0, modelActions);4 I3 K5 I0 c# B" j1 O- w
        + h2 b8 z5 M7 d! u  A
    return this;" f- t) k6 Y0 T/ E( j
  }
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