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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:% Q" I0 |4 \  r- n! r

+ N3 X: v0 L- q+ r public Object buildActions () {, _# o4 V- P3 o3 ~& [; W
    super.buildActions();
" c" c% F& F- \& _7 q/ b7 d   
! M4 f1 f# v( H2 V0 v' H    // Create the list of simulation actions. We put these in
: _! z2 w2 U+ [    // an action group, because we want these actions to be
4 K# v4 G* z1 @6 l    // executed in a specific order, but these steps should* O$ C* T) ^, T5 x: R) J7 [
    // take no (simulated) time. The M(foo) means "The message
' |+ e1 Z- ?: y) f! }    // called <foo>". You can send a message To a particular! i+ M  q9 d; C" e! ?: e8 N# T. g8 f% N
    // object, or ForEach object in a collection., v, I/ b3 Z3 U0 @3 S: O& v! g
        
5 s) b( X& n4 x5 M: _    // Note we update the heatspace in two phases: first run
8 N+ J% x+ L% G, f4 z    // diffusion, then run "updateWorld" to actually enact the
/ \8 m) Q* X& D5 B    // changes the heatbugs have made. The ordering here is
9 M& ?7 E. J, q- J& e; O    // significant!
' t& X' p, I) S5 g9 N6 f        
/ _7 N1 s+ {; \+ S2 i    // Note also, that with the additional
: d0 v  [, E9 Z5 j    // `randomizeHeatbugUpdateOrder' Boolean flag we can  R! J3 l% O5 _) X; |' p! I
    // randomize the order in which the bugs actually run
& E2 K; w' M9 {/ @; x+ Y* q4 K$ a: D    // their step rule.  This has the effect of removing any
6 L8 T' F" Q# g, _    // systematic bias in the iteration throught the heatbug. v- J0 c1 V& V( f( b3 {
    // list from timestep to timestep5 H* `- x9 l& Q* F& g. o4 y( x
        % |% ], O1 @8 a$ H0 g0 \( v4 V
    // By default, all `createActionForEach' modelActions have  o8 \6 F/ p0 b# T
    // a default order of `Sequential', which means that the
# o1 R5 M3 z3 D: B/ m. E& U) ?    // order of iteration through the `heatbugList' will be
2 v0 q2 P- Y4 I) L! j' K3 H    // identical (assuming the list order is not changed
; F0 ^/ N% l9 e5 U    // indirectly by some other process).2 `% S3 ]  z$ A# U
    : T- e# N8 R! o9 z' Y6 ^$ [
    modelActions = new ActionGroupImpl (getZone ());& J( f- H$ V. }

# _1 t* E+ S0 |8 o$ |    try {
, V' ^9 w$ `# a      modelActions.createActionTo$message1 ~5 v- {2 j" l, U$ P# {
        (heat, new Selector (heat.getClass (), "stepRule", false));
" }, N9 ]+ k% X: A3 Z; t. R    } catch (Exception e) {: ?+ j) \( A$ k, g6 R" c
      System.err.println ("Exception stepRule: " + e.getMessage ());6 @- e4 O" H& G6 L( _  Y: u
    }# {+ J& K& S3 Z& P; u" |8 J

' ~" E: d# X$ I! E) F9 C- T7 m    try {
7 T  r) o$ c& i3 x      Heatbug proto = (Heatbug) heatbugList.get (0);
& r( F7 ^$ Q; `. @; M      Selector sel =
" E9 b6 V, {6 x& t) M$ `        new Selector (proto.getClass (), "heatbugStep", false);
7 U$ `  {- s4 A      actionForEach =4 \9 y0 e4 j0 C: b7 q) c# G/ J7 [
        modelActions.createFActionForEachHomogeneous$call* D  D; `3 l$ M1 L( U) o$ Z5 Y  l
        (heatbugList,, X0 u( o3 F! Q( z" R- B  K! X" ~
         new FCallImpl (this, proto, sel,6 x) j8 i* G7 ], a% x
                        new FArgumentsImpl (this, sel)));1 U! X% d8 M8 K+ d: P2 _
    } catch (Exception e) {$ V+ I4 r5 b, q# z8 r7 R
      e.printStackTrace (System.err);, r( C* t# I/ g8 h
    }; u6 w$ k/ Y+ c+ [' ?1 ~) ?
    ( {/ }7 Y! v4 `7 c0 C
    syncUpdateOrder ();6 V0 O/ V9 E2 W, c( W6 |! R
! x7 @0 T9 C6 ~, j1 X4 i& Q  M$ G
    try {
; L0 {: k7 g& H4 V      modelActions.createActionTo$message % q! G6 J! B  E
        (heat, new Selector (heat.getClass (), "updateLattice", false));
# z! |$ r$ r5 L( n+ ]. o    } catch (Exception e) {4 A& ^! y2 N1 K
      System.err.println("Exception updateLattice: " + e.getMessage ());! i4 x) r: w" G
    }* W& w; i! U* r1 Q; G, t- y
        
2 o3 [: [1 B, A2 R0 k( w    // Then we create a schedule that executes the
1 e* f0 {: X0 v( h8 s- ^1 b( z    // modelActions. modelActions is an ActionGroup, by itself it
2 }5 P: ^0 L( ^; k    // has no notion of time. In order to have it executed in3 q, G0 Q3 k( h- m9 r" c
    // time, we create a Schedule that says to use the
6 ~& W2 d5 g" a6 s1 _* h    // modelActions ActionGroup at particular times.  This; ]! p5 ^8 Q! \# P, k
    // schedule has a repeat interval of 1, it will loop every
! A7 ^# y6 {1 m, a( C7 k    // time step.  The action is executed at time 0 relative to
+ c7 L% \+ `# J, X  ], V1 ~0 ~    // the beginning of the loop.
" O8 n  k% `; f0 y. S) {/ o, y' g& H6 o( L6 F0 o- e
    // This is a simple schedule, with only one action that is
7 R1 E! p+ j2 j% k5 q* m! f    // just repeated every time. See jmousetrap for more7 q& d* @! e4 g! t8 w
    // complicated schedules.
% y* j6 U$ C9 Y' I  
9 T7 w% m% N% R  m* w9 j. J! K- y    modelSchedule = new ScheduleImpl (getZone (), 1);
9 N% s2 }' c* C+ r; ]( a7 C! A    modelSchedule.at$createAction (0, modelActions);
, c. {3 u# ^. r/ z8 K        
8 P1 S$ C# P' D    return this;
: c3 b+ G. C3 b: h6 q2 _  }
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