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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:4 ^) {3 c$ E1 ?

4 C! c3 v6 @4 m6 t% L public Object buildActions () {" p- m; Q3 y/ g. R( j2 V
    super.buildActions();( k3 |7 o: X! \  V( N! B2 k$ w
   
. I3 T. |) W7 E. N. p# q    // Create the list of simulation actions. We put these in6 X& o/ \( G6 o* ?
    // an action group, because we want these actions to be6 N9 {  |  t- |, \3 j, X6 C8 p
    // executed in a specific order, but these steps should1 P: G% ~9 j4 Z6 U
    // take no (simulated) time. The M(foo) means "The message5 T0 |& V; P- o% m
    // called <foo>". You can send a message To a particular9 Y/ L# X' T+ p4 z3 `7 U
    // object, or ForEach object in a collection.9 p/ {! u4 w- C; M1 Q
        
) J4 [8 x, S# V1 ~4 G0 c5 f    // Note we update the heatspace in two phases: first run
. Y9 U: L+ o/ U, e7 ^; W    // diffusion, then run "updateWorld" to actually enact the
' E  M  Q, o  O! a* b    // changes the heatbugs have made. The ordering here is
8 C# d  _) G& t4 N; W% T  u    // significant!7 b: J2 c7 u+ i' ]9 X
        
4 E: P( E9 e" d% y0 k! [$ M    // Note also, that with the additional
1 N4 k0 f$ i' i2 ~& E- N    // `randomizeHeatbugUpdateOrder' Boolean flag we can2 L6 l+ c- a$ I# B  D% N7 q
    // randomize the order in which the bugs actually run
0 i& v! F. i( k7 {/ [    // their step rule.  This has the effect of removing any
. |! c8 t* J! i. Q    // systematic bias in the iteration throught the heatbug
  t* v% e6 `: k! @9 y( H6 \    // list from timestep to timestep
9 u5 ]/ J8 N0 n$ C5 f        
8 Q& N" u' f/ c# x$ Z    // By default, all `createActionForEach' modelActions have! s. G( f) l" c& m; v9 _+ X0 Y2 g
    // a default order of `Sequential', which means that the8 f! T6 n- ?) y0 U9 a
    // order of iteration through the `heatbugList' will be
% J: j. R8 q: a/ q' v9 P    // identical (assuming the list order is not changed
8 z! \9 |* {" z2 B# r    // indirectly by some other process).9 a! z% {7 M  K% Q7 V: f
   
7 |5 e  b& M2 i    modelActions = new ActionGroupImpl (getZone ());$ m9 w8 [2 t: ~8 F  n% L! G
1 S0 r* Z& Q% G. O/ R
    try {
" D! V  B. [; Y2 }      modelActions.createActionTo$message
6 L# r8 W% h6 ?- _8 h% G0 c        (heat, new Selector (heat.getClass (), "stepRule", false));3 ^& U; W1 D8 R
    } catch (Exception e) {
# B( ?' n; o0 r  q( D$ z- p      System.err.println ("Exception stepRule: " + e.getMessage ());# q8 p+ Z  [3 V  Z. A
    }  t' {% y1 s% v- P/ ^  x2 x

4 Q5 I9 T& a, F0 e2 M+ e    try {
# ], t! L" g% E# Y7 d; h      Heatbug proto = (Heatbug) heatbugList.get (0);( \' l+ U: N$ o8 P0 t: t/ ?# B2 l) h
      Selector sel = ) u* p4 D6 _! _' b5 C
        new Selector (proto.getClass (), "heatbugStep", false);
$ j# M! d* Y: U7 P, x. b      actionForEach =
2 d" Z! M4 M; a, G% @        modelActions.createFActionForEachHomogeneous$call+ i- t, A# Q% j+ T9 Z* Y
        (heatbugList,/ x3 H0 Z$ u! S# @( U1 }1 L' u
         new FCallImpl (this, proto, sel,: w1 }1 G, O" D* I
                        new FArgumentsImpl (this, sel)));
# s! K$ c$ P! D    } catch (Exception e) {" P$ c& X# L, l+ s& R% _, ?
      e.printStackTrace (System.err);9 y' l4 q+ f( N. j+ U3 ]7 j, e
    }0 u* b4 B, R1 U* Z" R5 f
   
1 O0 z8 k& ~! i1 j' N( p$ ?    syncUpdateOrder ();
/ p& w3 d* `% L8 s; m( F# N" f6 v& L
    try {
! w9 ~' }6 Y  Y, A* X# F      modelActions.createActionTo$message 2 Z7 \9 n4 T) D0 R# y
        (heat, new Selector (heat.getClass (), "updateLattice", false));- d; H& _2 B4 x' R
    } catch (Exception e) {
# o! w% f/ ?& b) d, D+ f      System.err.println("Exception updateLattice: " + e.getMessage ());
, i  p* y- V: e* m" _9 j/ B    }" r2 D  C+ p2 p' t, l
        9 E, k7 ]* B- H& D* l9 t' L" ?
    // Then we create a schedule that executes the
' q1 e- K( R8 ?7 N+ ~: P  ~    // modelActions. modelActions is an ActionGroup, by itself it% [+ I% c" ?) Q( r% }7 O
    // has no notion of time. In order to have it executed in2 g0 Z, F1 i  J8 I
    // time, we create a Schedule that says to use the
% X; n' w+ M" K7 N( `; W* f( H    // modelActions ActionGroup at particular times.  This
7 F/ P! y' [: f& A4 |9 h& l$ C    // schedule has a repeat interval of 1, it will loop every. S+ u1 W/ `4 Z& j1 h
    // time step.  The action is executed at time 0 relative to
* M, }+ C, ?) s    // the beginning of the loop.
7 w8 y, _1 f) a+ y/ D/ h, b1 }) j* S8 o% v. f+ w! D* \
    // This is a simple schedule, with only one action that is
  P; I  [! t  T  [. U* c6 t    // just repeated every time. See jmousetrap for more
3 g( w* j2 T( {, b, p; @5 ]    // complicated schedules.
: L  G! h- Y) K0 @( J; `  
, S6 D( `' D3 m) \    modelSchedule = new ScheduleImpl (getZone (), 1);# O; }9 T! Q* a1 [0 s6 R$ b
    modelSchedule.at$createAction (0, modelActions);
- {  o! z5 L, ~& F        2 }' y) G! F& d: }6 e
    return this;
% H1 w  ]8 `6 W- t  }
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