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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:6 W$ l( L" V) v$ I. _! M: ]
$ d' D- x- K* Z* d6 k" C! w
public Object buildActions () {
9 N. U5 u1 Z4 O3 t! ~/ a- w    super.buildActions();
! |- y4 o  [8 `  o4 g    $ y6 n# H% Z, y' ^
    // Create the list of simulation actions. We put these in
: w, {* H( P; K  n6 z    // an action group, because we want these actions to be
2 a6 U" z5 C0 w    // executed in a specific order, but these steps should( I& _# U3 `- n$ n+ s
    // take no (simulated) time. The M(foo) means "The message5 S8 X7 h- s. v5 L
    // called <foo>". You can send a message To a particular+ ^1 E7 N0 ~1 u
    // object, or ForEach object in a collection.' ]  @4 M6 ?( {) Y0 z5 K* l
        
. Z0 J( B* ?- I6 M1 l    // Note we update the heatspace in two phases: first run7 d4 v+ o1 H: l1 e. F3 g
    // diffusion, then run "updateWorld" to actually enact the
# p" ]: X- ^, D6 |    // changes the heatbugs have made. The ordering here is
4 C5 B2 O* A7 K" P    // significant!
) R! k% @" ]3 m+ n/ D' N        ( \% @8 I7 \, ~& r
    // Note also, that with the additional7 R6 o5 q  j+ s! Q/ R6 m% Y
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
  M' @9 L9 `$ {5 F7 g' L. m    // randomize the order in which the bugs actually run1 `; L& `' f* x' l( s3 U
    // their step rule.  This has the effect of removing any
6 W) P, Y% C* m! r9 E( R# `    // systematic bias in the iteration throught the heatbug) r$ g: ]7 s' W$ y( ?& \
    // list from timestep to timestep5 O  L& j* H' D
        1 n  z1 d4 k% }' C8 E2 N
    // By default, all `createActionForEach' modelActions have  s6 L4 V+ ^5 G# g6 V4 ?7 }/ H
    // a default order of `Sequential', which means that the/ f- [! O( `$ p5 I$ T
    // order of iteration through the `heatbugList' will be0 A# }' `7 ]- _2 F
    // identical (assuming the list order is not changed
6 k) |5 P  O* ~% p    // indirectly by some other process).
0 Y# u' \2 G- |5 W8 d# R6 B' F   
  z- o( q7 x) o& T* q, P    modelActions = new ActionGroupImpl (getZone ());
) K- F# X8 t7 ?8 a2 A, b- h
+ O+ Z: W; o7 J0 |" y: L    try {  h# k- H. E0 K" W/ ~4 V) g8 ]
      modelActions.createActionTo$message
7 \* d5 U! u* f4 z: k        (heat, new Selector (heat.getClass (), "stepRule", false));
. U- Q- v' k' P. p% r  }& Q    } catch (Exception e) {; t3 P9 }# M+ ?1 U. \( W2 G* x1 x
      System.err.println ("Exception stepRule: " + e.getMessage ());
3 R$ a3 \$ Q" v. y    }2 D1 F0 t/ @$ c/ t7 b
4 K4 P% }4 {, X( k# C
    try {
# {: A8 i: s7 m; o$ _      Heatbug proto = (Heatbug) heatbugList.get (0);! C; c; G: }5 R" `9 I8 C
      Selector sel =
$ _1 x* f9 ~! n9 T8 e+ k        new Selector (proto.getClass (), "heatbugStep", false);/ U! {8 b" E8 f% j& i
      actionForEach =) Q8 L  ~$ Z6 ~3 e
        modelActions.createFActionForEachHomogeneous$call1 L' [3 l' g5 v; {# Z7 Z/ w
        (heatbugList,
4 ^1 W$ c7 R1 b7 `; {         new FCallImpl (this, proto, sel,4 ^) Q: ~  |, i  m+ y8 |
                        new FArgumentsImpl (this, sel)));/ {5 G6 U0 L1 Z
    } catch (Exception e) {
& `2 [' u- f9 {. ?( u! D: ]/ t! Y' g* Y. A% Y      e.printStackTrace (System.err);
. I1 Z" B* W* \! |3 }    }
7 I6 s6 L. C( ]! C    / a, O" S8 O7 U1 [+ W
    syncUpdateOrder ();6 R- u- n  T3 q

( |: t- Q- d7 K% v4 k5 R    try {
; b; e" K7 \; Y5 Q      modelActions.createActionTo$message 8 h& `1 v: d" S% u. h" f
        (heat, new Selector (heat.getClass (), "updateLattice", false));
$ V& ~9 V- M7 J    } catch (Exception e) {
6 n( O7 o" ^( t" l2 _9 Y6 [      System.err.println("Exception updateLattice: " + e.getMessage ());
2 `7 b3 B/ T  d    }1 X" y0 N- `2 T
        ( n  @' T* K2 {
    // Then we create a schedule that executes the
3 G( }0 R$ T/ \$ ^2 c8 V- r    // modelActions. modelActions is an ActionGroup, by itself it
! ]& y* |8 K, n9 y2 S$ C    // has no notion of time. In order to have it executed in
0 M: T, a8 ^% A& z( W/ S) l. |( x' X: d4 E    // time, we create a Schedule that says to use the
# x3 T0 Z: X' L/ Q& L    // modelActions ActionGroup at particular times.  This, t- H7 {9 h3 x9 y
    // schedule has a repeat interval of 1, it will loop every, T  A4 X% G3 m# P6 n/ _
    // time step.  The action is executed at time 0 relative to1 V+ ^  c/ G/ r2 _: e
    // the beginning of the loop.3 T0 a+ L5 j/ `  R$ H) M( X$ T

( u: {7 ?1 K/ p    // This is a simple schedule, with only one action that is
2 O2 I' H; S% W" X, u! T: S( ^    // just repeated every time. See jmousetrap for more$ N3 ]% {& ~5 Z( @! k
    // complicated schedules.$ ~1 h, O: F' U' [- a# ^1 v# u
  
% I+ y! @& |6 \    modelSchedule = new ScheduleImpl (getZone (), 1);
) j9 E2 u1 P" I    modelSchedule.at$createAction (0, modelActions);, a  a5 Q, v. B, [
        7 K0 u# d; H* O& {2 A" J1 h" A- a+ t
    return this;: x3 U9 m: ^2 o  s( G" X! d
  }
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