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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:
! {7 |7 y' D! q8 `% V3 p% r$ R9 ?1 e% ?# N& r( m% F
public Object buildActions () {8 H7 V* S# [6 {% Y
    super.buildActions();+ E  i- Y# c$ V, l2 r  V) y8 Q
    4 H2 q  F( b3 a# H$ h
    // Create the list of simulation actions. We put these in  U% H2 E2 u! _* g
    // an action group, because we want these actions to be
1 h) X4 E4 E5 V  d. P& P( p    // executed in a specific order, but these steps should
- ?; w4 Y0 U3 d% V& t    // take no (simulated) time. The M(foo) means "The message) M6 ^2 b: z7 Y6 d- {" D6 r! ]
    // called <foo>". You can send a message To a particular
: ?8 u3 D9 W5 R8 K    // object, or ForEach object in a collection.2 C4 M, T1 H2 m2 X
        
: F$ q, ?5 F5 B; j2 ]" y) p0 ^! S    // Note we update the heatspace in two phases: first run( j% C! q7 l! }8 n! }0 q! e
    // diffusion, then run "updateWorld" to actually enact the% N, F8 `0 h, a2 D$ J
    // changes the heatbugs have made. The ordering here is
' }" F: \5 w# I9 d2 w' i    // significant!
* J" ^- T0 @- @) t7 ^5 N9 p        
) `5 \# m! u, d    // Note also, that with the additional
, {7 h2 j8 D2 z( T8 C/ v    // `randomizeHeatbugUpdateOrder' Boolean flag we can
( d+ M1 ?# G4 _/ s    // randomize the order in which the bugs actually run
- J  I7 t: g% {5 E& }7 a    // their step rule.  This has the effect of removing any$ O* c2 p: P5 A, x
    // systematic bias in the iteration throught the heatbug
9 g2 T0 E) ^6 U9 [* G( U6 T    // list from timestep to timestep5 M2 g' P* H8 k, y
        1 X# |3 x; `7 I5 t5 t
    // By default, all `createActionForEach' modelActions have
/ _. R3 L* R$ O: c, i0 x    // a default order of `Sequential', which means that the$ l+ V( ]. }8 Y; H) `4 }
    // order of iteration through the `heatbugList' will be  y7 _1 y1 B8 @; y
    // identical (assuming the list order is not changed
* F8 Z% @9 W/ f0 V6 z  m1 n" r    // indirectly by some other process).
, }+ S3 ]  C6 D* }+ {* m: R, A" t   
  o. `* Q: A8 M6 d    modelActions = new ActionGroupImpl (getZone ());1 J$ Q, i! t* i9 \

( s  D9 `# P  d+ P    try {
9 j- R% {3 T% y      modelActions.createActionTo$message  f; I; a! M! O( |- v& i: c0 |4 j
        (heat, new Selector (heat.getClass (), "stepRule", false));9 b% E4 A$ J' B* v
    } catch (Exception e) {3 D6 i: q( a+ [0 J6 ?) D: E1 P
      System.err.println ("Exception stepRule: " + e.getMessage ());! P- F9 Y0 A, `7 ?
    }2 W$ n3 |+ |! p) r' `

: i% K3 e1 v+ M* @2 q5 k7 a& W  e    try {
7 e* k- |! K/ F- {  [      Heatbug proto = (Heatbug) heatbugList.get (0);
6 q8 V7 u9 [( I" u$ k% P7 H      Selector sel = : T& K$ x% A4 k
        new Selector (proto.getClass (), "heatbugStep", false);; f; _# M0 s2 j$ x+ y
      actionForEach =
8 j/ Y8 B+ L* l. t9 V) q: F5 d/ e        modelActions.createFActionForEachHomogeneous$call- \9 a5 x& c% u/ C" g3 Q
        (heatbugList,' z6 O0 E  [7 f6 Q5 a$ F: n
         new FCallImpl (this, proto, sel,. I+ s" N5 G; p
                        new FArgumentsImpl (this, sel)));! m( Y& X, O9 L7 t$ c
    } catch (Exception e) {
( w7 Z; W8 L& X3 W' t      e.printStackTrace (System.err);$ Y: A; E3 r; P9 ^5 |
    }* G! R1 \: N, s3 m, g0 n* O0 _
    % e- R/ S6 ?0 q; H3 ?: b
    syncUpdateOrder ();
1 {) I. X) ]6 o/ r, L* j0 r2 b# u1 U) l8 c8 c  H4 _
    try {! D$ Z+ Q) l7 e1 H6 B9 x0 O7 ~
      modelActions.createActionTo$message
$ O* g* G0 b+ _$ U9 L: E3 G7 U, [        (heat, new Selector (heat.getClass (), "updateLattice", false));3 T1 g! K8 |9 C2 r
    } catch (Exception e) {
3 J$ p' J4 r5 C% H' e' N      System.err.println("Exception updateLattice: " + e.getMessage ());& V/ _3 F+ H5 _  O, E/ C
    }
) B3 I1 R$ O, \8 e' S        5 [- V! D1 c- {4 X
    // Then we create a schedule that executes the# i* |! f  v' ~, s: c
    // modelActions. modelActions is an ActionGroup, by itself it
" s' m7 Q$ m2 |0 B1 C    // has no notion of time. In order to have it executed in
7 j  w. Q* q5 i. q8 L- |    // time, we create a Schedule that says to use the
: a: l: E- R4 |! U  L    // modelActions ActionGroup at particular times.  This
! D: @9 |, m; h. l3 Q# ~' m( P    // schedule has a repeat interval of 1, it will loop every
8 ]$ [1 c4 F/ h' c    // time step.  The action is executed at time 0 relative to) e/ \0 k: K3 Z. F( o
    // the beginning of the loop.7 R( w) R1 x  ~1 |9 C* F

4 u5 F( U+ N. O! B) A    // This is a simple schedule, with only one action that is* D; ?. E# B) F. D' `  n
    // just repeated every time. See jmousetrap for more5 R. R2 ^9 |0 L& N: ~
    // complicated schedules.' }6 M; B. A4 ~# D% S5 O9 m
  3 O5 \+ d/ g0 o+ a. Q
    modelSchedule = new ScheduleImpl (getZone (), 1);
! ^+ G" C# o" U3 g    modelSchedule.at$createAction (0, modelActions);5 h- `8 a4 ^* z5 S; Y" {  g2 |) e
        
% t/ k# Q3 y0 D; i9 [8 V( j( w# Q( ^    return this;7 q( t4 M  [6 k4 o; _
  }
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