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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:' `" P3 L9 l( L. A% c% F

( L0 n- z, T% g4 Q- R  w0 |( X; ` public Object buildActions () {. ^' s, o+ y$ @" j
    super.buildActions();1 b! H% n$ ^* V
    0 O4 u7 ^* z, {. Q& p. B# q
    // Create the list of simulation actions. We put these in
; J+ ?% c/ Z! z4 \8 Z! L+ e    // an action group, because we want these actions to be
0 f9 j; T1 O2 W4 @    // executed in a specific order, but these steps should! s3 s4 c1 Q" h) G2 w! H. d
    // take no (simulated) time. The M(foo) means "The message4 {" J6 _! |7 s3 }' F
    // called <foo>". You can send a message To a particular" J& D2 t7 A3 ?( s( X6 h7 D
    // object, or ForEach object in a collection.
. V* u8 O% h) g/ q2 J        2 ~% p0 b& c0 x+ t
    // Note we update the heatspace in two phases: first run+ e& X( t: M9 X3 H; P* \7 c
    // diffusion, then run "updateWorld" to actually enact the% k9 q' j% p4 a$ }/ ^
    // changes the heatbugs have made. The ordering here is
( C% u0 @" o: A9 P    // significant!
4 l( T; I8 M2 A+ W0 r# }8 L. W        
1 p/ |) _! S$ R' M    // Note also, that with the additional  ]# Q- `. d0 m: _/ s! U
    // `randomizeHeatbugUpdateOrder' Boolean flag we can1 l: J3 q' ]7 Y* \
    // randomize the order in which the bugs actually run* M# l8 m1 V- T) ~, G3 a
    // their step rule.  This has the effect of removing any+ S9 f) E, t  V5 u
    // systematic bias in the iteration throught the heatbug
/ i: u, W* l1 g; b    // list from timestep to timestep" p# p  v- S4 k( p
        
/ g- B8 ?: U2 A" ^4 g7 o6 f    // By default, all `createActionForEach' modelActions have8 S3 y7 t, a' R% \/ ~
    // a default order of `Sequential', which means that the# [4 ]: e3 u, m5 }2 Y6 y
    // order of iteration through the `heatbugList' will be5 N  ?' B9 X  t) j' ~0 ]
    // identical (assuming the list order is not changed+ i" b( k) N, v% H7 g( z( r
    // indirectly by some other process).. d1 w3 K3 v1 Y& o8 v, a  E" a
   
1 u7 w4 X0 ?9 n( `" K" k4 j* j9 @    modelActions = new ActionGroupImpl (getZone ());8 M- d6 {* u7 r' j

0 a& k' {1 i  k8 O  H6 V3 i    try {
. N# v' g  P2 v7 j; z2 v) N9 a      modelActions.createActionTo$message
- x8 s- M6 F0 u6 Q' W        (heat, new Selector (heat.getClass (), "stepRule", false));* A9 ?' X5 a  t# X  o! S
    } catch (Exception e) {- K8 N- Y6 G6 W; P# u. {
      System.err.println ("Exception stepRule: " + e.getMessage ());
( j' o7 x7 {0 F' n2 x    }
& g% f, a* X5 g& F8 ]4 i; F. V' {
    try {
! p0 u- z1 ?. V; L$ Z$ _* h      Heatbug proto = (Heatbug) heatbugList.get (0);
  h% f- g, Y* u8 {; x      Selector sel =   G% j, ~& Q- I+ ?% t
        new Selector (proto.getClass (), "heatbugStep", false);
5 C1 Q4 W! }( \3 k$ m      actionForEach =3 R" t+ ?0 }; R1 Z
        modelActions.createFActionForEachHomogeneous$call1 y5 S3 ^, D' g( J3 X2 |, G
        (heatbugList,2 v3 N9 q( b8 O0 O# |3 d
         new FCallImpl (this, proto, sel,# X, d$ b1 j/ k! k7 C
                        new FArgumentsImpl (this, sel)));
6 X/ [, h- B( F% T, ^6 l2 X0 @    } catch (Exception e) {' s. B* Q1 |6 H9 ^) Y, n
      e.printStackTrace (System.err);
/ h' Y) L2 b2 w- `7 Y    }; S6 D; b5 @& V5 T! I! Z
   
- g1 V! l6 b4 W& A# z/ z8 `    syncUpdateOrder ();5 \% N7 @+ o+ o+ @) g- W. ]

, l  _) f. r$ \( s5 N( g- i    try {( ?7 M8 G) W6 h* U0 Y2 O( v& u
      modelActions.createActionTo$message 4 ]( t& x- g; ~  `
        (heat, new Selector (heat.getClass (), "updateLattice", false));4 S# q# H0 \+ ?  V7 Q6 i8 ?
    } catch (Exception e) {
5 A: q. B; M/ B5 e      System.err.println("Exception updateLattice: " + e.getMessage ());
, T4 |- N3 p. M+ K5 r    }- Q2 E- R& r% E; n" _
        
2 V# q+ T4 X/ X: h/ `    // Then we create a schedule that executes the( K  U/ \* `; Y" w. o4 x# D$ A
    // modelActions. modelActions is an ActionGroup, by itself it
0 W1 k2 s  }; N. L2 j" t9 T    // has no notion of time. In order to have it executed in
  }/ d8 a: I2 m1 P( `8 @    // time, we create a Schedule that says to use the
0 o; y9 s2 m4 g; ?7 F    // modelActions ActionGroup at particular times.  This/ q; y) o8 A) h" m5 v! Q3 g0 \+ v; X" K) O
    // schedule has a repeat interval of 1, it will loop every
+ y6 F2 `! O3 u% J  E/ F: b    // time step.  The action is executed at time 0 relative to8 @4 g5 r$ N7 D
    // the beginning of the loop.
$ Y* `' n8 I6 j5 b$ e" i) d2 F8 _1 [2 s% q
    // This is a simple schedule, with only one action that is% b) X2 X9 z9 @# \' R
    // just repeated every time. See jmousetrap for more
) h$ M$ W0 @  }2 a) n: ~# ~" u8 G    // complicated schedules.  _, M4 a8 q0 B3 q: b8 X8 ~0 x; M
  6 k- Y( W1 C" v& r% W' d0 B. `
    modelSchedule = new ScheduleImpl (getZone (), 1);+ X( n2 L) w9 N- t$ t5 R$ N
    modelSchedule.at$createAction (0, modelActions);
( \. v5 ^6 C, y( f& d, n+ X$ ?        9 d' ]1 F' H0 T! C3 m" v2 t
    return this;
, v( k- U! h1 A& h- w* P  }
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