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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:. o" i7 o1 p6 @0 v
% _: W% z4 W/ {
public Object buildActions () {4 H( f$ b7 _* H( s; w5 W/ {
    super.buildActions();' C3 w9 \. z! o1 |3 C6 Y% \
    ' i1 e5 c' u3 ?( {' Q- A
    // Create the list of simulation actions. We put these in
- {) [" Y# V- d% c- J. D5 O    // an action group, because we want these actions to be+ \8 R9 t& [6 X8 A- i$ K
    // executed in a specific order, but these steps should" T) c; M  r/ k1 R$ m8 Y7 \  g# J6 e" f
    // take no (simulated) time. The M(foo) means "The message
4 `- B8 t  f8 F( W% [    // called <foo>". You can send a message To a particular
) j; H( q" S8 u% u    // object, or ForEach object in a collection.( L- z; L: k3 Q
        
% b$ C2 H8 ^2 @$ T' O) W    // Note we update the heatspace in two phases: first run) M* F9 h! j0 V  i/ d: M* f
    // diffusion, then run "updateWorld" to actually enact the
% Z) Y! }7 W% X1 \# F) D    // changes the heatbugs have made. The ordering here is
$ ], t# B2 g! @, D; [    // significant!0 B$ `, m- g' C  [, O
        
* I2 z. s6 U% n3 x- Y7 k    // Note also, that with the additional
& [$ [9 c3 R, U0 U    // `randomizeHeatbugUpdateOrder' Boolean flag we can
' J4 x2 y  t. |: Q( r    // randomize the order in which the bugs actually run2 J( A& t; _; g$ D
    // their step rule.  This has the effect of removing any' E2 h7 V2 E4 _
    // systematic bias in the iteration throught the heatbug
3 n8 Q/ v- f1 b4 J/ x  y+ s1 B    // list from timestep to timestep
- L8 e0 p% y4 C  D, |) J8 Q        
9 ^  t6 _* K" ^5 l4 K$ H) R    // By default, all `createActionForEach' modelActions have) Z! U" M. u- d* T: a% w
    // a default order of `Sequential', which means that the
% t: r7 _% a4 F/ w  K7 M. _! A    // order of iteration through the `heatbugList' will be+ N9 \) P, N* K( d% s
    // identical (assuming the list order is not changed
, @$ T9 j! T  E* W    // indirectly by some other process).0 l' E$ L& G# {
    . h$ ?# _. j3 D+ q% h; Z1 l4 M# I
    modelActions = new ActionGroupImpl (getZone ());
, T% N  y8 ?. n9 P/ p' E* b5 {) I7 D
    try {
. b+ \+ V$ K* C4 [$ w: Z      modelActions.createActionTo$message5 F1 g$ ]( p5 v8 F
        (heat, new Selector (heat.getClass (), "stepRule", false));
2 f" b5 l, O$ K& T1 o    } catch (Exception e) {+ A+ t& l! x+ r4 U7 H/ ^
      System.err.println ("Exception stepRule: " + e.getMessage ());& q3 r% ]3 J1 w
    }# G. T) i  j( L

; [: Z! w  ~0 N8 J$ N* ?$ B# Q    try {9 R: y& z& m1 R/ F
      Heatbug proto = (Heatbug) heatbugList.get (0);
7 S& Q# r3 q& x# x8 J5 t' o      Selector sel =
, @( z# ?( b, F- P6 |' g& Y( c+ h        new Selector (proto.getClass (), "heatbugStep", false);8 Z# h# M8 A% o8 P: X
      actionForEach =- o0 u  H& B6 x( J
        modelActions.createFActionForEachHomogeneous$call2 E9 d3 Z; `- j: n
        (heatbugList,& m9 w: V6 `- W; q" [7 N
         new FCallImpl (this, proto, sel,
5 g& s, R, J) r/ R                        new FArgumentsImpl (this, sel)));
' n& r7 R. _* U    } catch (Exception e) {
4 E& x& s; V( v' M! c3 W" C      e.printStackTrace (System.err);/ E- y" p4 K) x" r' C4 |
    }2 f1 Y  m5 M8 d- T+ f
   
/ }1 Y  u9 g, e' X/ L+ W    syncUpdateOrder ();
: s, `" P# e# v1 [, b% ]/ r2 \
5 p: E- }: n/ X+ l1 M5 J    try {
$ C, g% o! f( y      modelActions.createActionTo$message * q9 ?+ K% m# A( {; n% H5 g4 U6 G
        (heat, new Selector (heat.getClass (), "updateLattice", false));: d0 ?8 y2 [8 Q. x$ I4 f8 z9 n
    } catch (Exception e) {
- w  P0 W4 ?8 x/ E# ~; t      System.err.println("Exception updateLattice: " + e.getMessage ());
1 ?* n1 ]) K2 ~, o% {    }) h/ L2 k2 y5 G
        & }, w; S* {9 [( H2 H, b8 Z# P
    // Then we create a schedule that executes the$ W2 L% y" {+ D: R
    // modelActions. modelActions is an ActionGroup, by itself it) x. V* v# B( F" |* t' b0 L* u+ `% Z
    // has no notion of time. In order to have it executed in
! x. Y+ M/ x% f' A+ `" V    // time, we create a Schedule that says to use the- c# j( c  L- ?% E! ?
    // modelActions ActionGroup at particular times.  This
7 v: U! G% X4 ]0 L: p3 @    // schedule has a repeat interval of 1, it will loop every
( `* y6 J/ v4 G1 |' f    // time step.  The action is executed at time 0 relative to! O% L- L4 c! P$ ^
    // the beginning of the loop.' F! y7 A3 y$ \, Q/ r* F8 S( G( K
* H- C* q( \0 _8 g, I
    // This is a simple schedule, with only one action that is
/ @* e4 o  I) B$ s& c$ ~; m    // just repeated every time. See jmousetrap for more  r0 R8 |, q" _" |3 U! P
    // complicated schedules.6 ?) `/ ?9 ]+ V* z( m1 i1 d
  ' b: p+ k* M! |$ D9 K& V
    modelSchedule = new ScheduleImpl (getZone (), 1);
5 a/ I4 M& x% u4 B* f. r- o    modelSchedule.at$createAction (0, modelActions);  k4 ^% t8 }9 Q) [  I
        
" |, U" V* k* f. u; X    return this;. n- i' `1 I7 @
  }
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