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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:) y3 M+ u! J% x3 J1 @4 \

# J+ I; W5 N9 g* Q4 e$ p public Object buildActions () {
0 K& O: g6 J& f3 r8 e, J! y    super.buildActions();, U; \/ o# {! R! [, w7 X+ A: d
   
5 @7 o5 A. W1 q& L& n: ~    // Create the list of simulation actions. We put these in/ Q+ d8 H" p, U& ]6 W1 `; |
    // an action group, because we want these actions to be" d7 q) K3 U  j! }8 Y+ {; {5 L
    // executed in a specific order, but these steps should
: J5 t: d! G2 D' S    // take no (simulated) time. The M(foo) means "The message
* V6 p5 X5 y" u6 L    // called <foo>". You can send a message To a particular" d9 `% q6 y5 R3 H8 ]
    // object, or ForEach object in a collection.
( ^' R/ A$ F) a4 X; ]* m  {        
! S% ^$ ^9 `! K. l( [    // Note we update the heatspace in two phases: first run
9 M% Y* S9 _+ F% J" w1 H* @    // diffusion, then run "updateWorld" to actually enact the
; _: O" G/ O/ f7 `- d% V, V7 n* M    // changes the heatbugs have made. The ordering here is$ h8 W6 u6 p/ L/ f* p: ^
    // significant!
" Y& d% O; `6 a! a0 ]" ]        / l" G$ c0 }( {1 T
    // Note also, that with the additional
: n- q! d$ S1 |    // `randomizeHeatbugUpdateOrder' Boolean flag we can) U) }0 N0 C" ^# T: q/ a
    // randomize the order in which the bugs actually run
$ i( {" l2 [5 o) A  V7 p$ R7 ~    // their step rule.  This has the effect of removing any
8 ]) Q7 \# m3 _    // systematic bias in the iteration throught the heatbug  }9 z* a' `9 n2 A* o4 u( z
    // list from timestep to timestep' X4 h6 j! R9 n  c5 j* m
        " o9 C* S" J" R+ M
    // By default, all `createActionForEach' modelActions have
# Q" k2 s. r1 M  l/ k    // a default order of `Sequential', which means that the- ]- J& y3 o- `! N0 i
    // order of iteration through the `heatbugList' will be7 I6 Q, P; C/ t/ X
    // identical (assuming the list order is not changed
3 u8 P1 \) M) l; f$ j    // indirectly by some other process).
- F: l9 M9 K7 D8 a# {( r   
7 Z$ s6 `" X5 B0 |' q/ P    modelActions = new ActionGroupImpl (getZone ());
& ~) Q6 f5 e0 U0 l
; ?* ], O" `% T' i/ t+ |    try {+ U; Q0 S0 k. H+ ~& u# `
      modelActions.createActionTo$message/ X" K6 e: I' t4 D' [- M
        (heat, new Selector (heat.getClass (), "stepRule", false));2 n) @5 z) h( V4 Q0 S
    } catch (Exception e) {
9 F. h  A: G" T% c& m1 D7 _% r0 k8 ^      System.err.println ("Exception stepRule: " + e.getMessage ());! V, E4 T5 z+ E2 G( A+ r
    }) g7 O7 n; P( \4 G8 i

0 f2 E& k/ c! C' i5 y9 D2 y    try {
( u! \& Q( a& g3 k( P' a, s' {) u      Heatbug proto = (Heatbug) heatbugList.get (0);' S, P1 a3 r& z2 K) m4 {$ l* B
      Selector sel =
- g5 X8 T/ }* @& c4 f        new Selector (proto.getClass (), "heatbugStep", false);
. v* N+ F! ^, y+ T7 L# K0 k1 n      actionForEach =
2 g3 M; F  L& O  |! [2 P) @        modelActions.createFActionForEachHomogeneous$call
7 \" f& J. o9 Q        (heatbugList,
6 q: ?; ~; l4 w( Q) N& g         new FCallImpl (this, proto, sel,
* u$ C+ G- t# r* m1 U                        new FArgumentsImpl (this, sel)));& X7 ^5 ~: A. [5 h' P$ o
    } catch (Exception e) {2 p9 y* @8 I! C7 i
      e.printStackTrace (System.err);. k6 ~- P, i" L2 |0 H" G! t
    }
# T( k: ~( D6 s$ _   
8 F7 s  R4 Y. |0 g# x    syncUpdateOrder ();
/ C3 }6 {1 q6 i# v2 C8 f
6 F2 a5 h# w: N- s6 L3 |! N- S    try {
6 @8 E& z$ n/ f8 j" }& `+ `      modelActions.createActionTo$message
9 f9 M* _& h3 _% V) N        (heat, new Selector (heat.getClass (), "updateLattice", false));
( {, k" I) ]+ y5 k6 D- P( L    } catch (Exception e) {1 W9 N* r4 T' Y  {6 }
      System.err.println("Exception updateLattice: " + e.getMessage ());8 y# B/ X/ G& Y% Z- ~6 B
    }' d" T4 `( d! R1 ]2 ]5 w7 {: c: z' n
        
# A. \, T5 p+ k; a- h3 r+ T0 Y5 H+ v    // Then we create a schedule that executes the
0 d) D$ S+ J. A) I: T    // modelActions. modelActions is an ActionGroup, by itself it
3 n. g/ V! i! Y$ Y! h9 M$ K    // has no notion of time. In order to have it executed in
  D2 N: d# i& N% x, W( |    // time, we create a Schedule that says to use the
% ^  w% @8 P3 f6 @5 v4 w    // modelActions ActionGroup at particular times.  This
# a' J" `' ]( x( B2 `; p    // schedule has a repeat interval of 1, it will loop every; g7 }* G. s$ H  n
    // time step.  The action is executed at time 0 relative to
, [7 @7 k! @1 X. w6 x    // the beginning of the loop.; ]) M/ S  D6 M+ q0 G

* O7 `$ h* _$ d' X    // This is a simple schedule, with only one action that is
# `# W& b; }6 H  t0 v3 B    // just repeated every time. See jmousetrap for more5 l7 {( y" r6 A4 U! w; \
    // complicated schedules./ D' _) R. V  v- }2 }6 H
  
  ^5 a4 W( Z5 B    modelSchedule = new ScheduleImpl (getZone (), 1);5 ^4 P5 z$ d+ y0 e% f0 `7 B
    modelSchedule.at$createAction (0, modelActions);7 Q! N  T6 ~1 i
        - k# X; `6 r2 ^2 p1 ?1 B# t/ C% l
    return this;
9 v4 o( U5 T1 M  c  }
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