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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:. |  d' t- u" O3 Y3 L+ J9 ]) b; x
' K: I9 {! u( i& j( E$ L' k" ?
public Object buildActions () {
( j7 _+ h4 {9 t+ p6 Z  G1 V+ R- \    super.buildActions();3 U6 k5 ^# m5 V
   
3 d7 ~7 N9 }; o) ]/ w    // Create the list of simulation actions. We put these in
5 W- b6 m( h( E8 S! j/ R    // an action group, because we want these actions to be1 |/ F. S7 K. v
    // executed in a specific order, but these steps should
  Q9 d: q- G: Q, G1 s2 \2 N    // take no (simulated) time. The M(foo) means "The message( H) S7 x( W& O9 t* ^( P
    // called <foo>". You can send a message To a particular
/ j' B( f1 h5 ^+ c. K% G- k. e4 w    // object, or ForEach object in a collection.
) I, q/ E+ c7 U" i6 A9 v        * k* S* Y. W: ^" R5 O! v
    // Note we update the heatspace in two phases: first run+ T+ e) u0 l  H/ R2 X
    // diffusion, then run "updateWorld" to actually enact the2 `6 Y9 p' W5 O! m& G
    // changes the heatbugs have made. The ordering here is
) S0 f1 H2 z+ j    // significant!
0 o0 z! s# r+ z. l/ @3 X8 k5 e        ) l- |* i; b4 J9 U: K" Z
    // Note also, that with the additional
3 q7 f, ]' ^+ y7 y, X    // `randomizeHeatbugUpdateOrder' Boolean flag we can2 H, Q  ^- Z' v; _( x5 ^* H
    // randomize the order in which the bugs actually run
; _  l9 E5 V+ @, x    // their step rule.  This has the effect of removing any& E3 E% f. _/ c7 q3 r, T
    // systematic bias in the iteration throught the heatbug
. A! E6 R) L  o6 _; b1 H    // list from timestep to timestep
) E) N( e+ y  B3 R        6 E( r# _. H6 J$ X
    // By default, all `createActionForEach' modelActions have
. B. ?, D" `8 R( @9 [. F    // a default order of `Sequential', which means that the
4 A8 ?: F- |4 n0 w0 l- v    // order of iteration through the `heatbugList' will be
" P) ?; c6 I6 n1 @1 l6 m  A0 f    // identical (assuming the list order is not changed$ i% b% L5 R, _" n4 q
    // indirectly by some other process).
* l3 ?0 T! U1 h9 u/ |7 u6 }8 f   
( O+ l0 J9 m# h7 p( e+ `2 h. b& ?6 t    modelActions = new ActionGroupImpl (getZone ());
/ n$ a: C& @& ?3 I
* i, d- ^1 N( s    try {
/ I/ E6 q7 y1 W( h      modelActions.createActionTo$message* H3 o- {+ a9 g, U
        (heat, new Selector (heat.getClass (), "stepRule", false));1 [, E! P$ x! g0 a- r" @* v$ U# h
    } catch (Exception e) {, e* N, D7 u+ f  ]0 H; ~. m
      System.err.println ("Exception stepRule: " + e.getMessage ());3 V/ d* d3 k) ?5 c
    }8 [0 Q4 R& S: z% }7 G

$ ^5 \4 n$ j  A9 w9 Z4 ]" F    try {
3 Y* _6 I, |9 I; S2 ~      Heatbug proto = (Heatbug) heatbugList.get (0);4 L5 n4 C( t8 a( D% K
      Selector sel = 1 W" c  r, A4 ^; R* A7 g( h7 ~
        new Selector (proto.getClass (), "heatbugStep", false);- [- Y2 B( q; w
      actionForEach =( ~' N1 L1 u% b% M+ Y" c' }
        modelActions.createFActionForEachHomogeneous$call2 X# b7 A% t+ Y0 @1 v1 X9 a% x
        (heatbugList,9 W& a+ b0 ]; J& A& K  J7 t: A  U4 |- A
         new FCallImpl (this, proto, sel,
% K' u' H& z. x1 h8 n* F3 P& ]7 J4 ]                        new FArgumentsImpl (this, sel)));$ W# O1 I1 f. z% g! x! h# D5 G
    } catch (Exception e) {
. t, \+ R6 ?& q6 p0 V8 {      e.printStackTrace (System.err);8 t3 x: L% M, s# R6 D8 F
    }; l) u2 x, E& A, f2 |
    / ^  v1 |8 K$ h
    syncUpdateOrder ();& t2 {7 B' {, O4 z3 p- m

. X( R  ^* H( F* E8 b    try {/ |, E7 m1 I; j9 @. b( n. j
      modelActions.createActionTo$message + O; C7 F# t7 n- Y) Z9 O% y$ U
        (heat, new Selector (heat.getClass (), "updateLattice", false));
! W8 R4 `" ^6 O7 ?/ F/ z    } catch (Exception e) {
" L9 P8 Z% _5 h% ?; L4 g. b0 s4 n      System.err.println("Exception updateLattice: " + e.getMessage ());
; j9 }; x: v' x# i    }
  `1 R7 ~7 p( W+ Q, O4 l        
* K: u% w2 ]" o    // Then we create a schedule that executes the% q8 R) H7 {, o4 n. p4 A
    // modelActions. modelActions is an ActionGroup, by itself it
$ D4 M! Q) S7 Y! M7 g! \5 ~    // has no notion of time. In order to have it executed in
  W4 v) k. D' ^$ }) R% ^2 ]    // time, we create a Schedule that says to use the
7 J- I3 m* Z" G: X, m, b4 N7 `    // modelActions ActionGroup at particular times.  This7 M2 D; W% d" L- v! Z3 T' n
    // schedule has a repeat interval of 1, it will loop every
/ i& h2 e- C* z% V: e  z    // time step.  The action is executed at time 0 relative to6 n6 j" G2 f- A2 }- h, J
    // the beginning of the loop.* U) \3 O! M! H, s) O, Y

; Y0 |' m2 l, k3 M. |    // This is a simple schedule, with only one action that is# _7 C! |% M/ D$ v8 W: e" i. N8 G
    // just repeated every time. See jmousetrap for more  x) E' x! ~8 G1 w8 P$ q0 i
    // complicated schedules.8 {- ]9 u9 ]& F' Q9 Q( d7 Y6 \
  
% m$ a7 Z+ s5 k3 P9 K1 z, f1 q$ `! r: j    modelSchedule = new ScheduleImpl (getZone (), 1);
. n$ N5 W1 i0 L" J! ?    modelSchedule.at$createAction (0, modelActions);
4 k7 g% l  S. A        
( I" e+ q( p2 V7 s$ t    return this;1 k! \, Y4 C5 P% i( P9 }, Y+ d* j0 ^
  }
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