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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:' R1 \' v* C/ i9 l
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public Object buildActions () {5 K- \5 j" I  C' @/ f9 i% f
    super.buildActions();
+ n% {. W* v7 j9 Y! Q" q& P% A    ! T, I: ]& d# l5 C
    // Create the list of simulation actions. We put these in, s, K8 s" s/ d$ h
    // an action group, because we want these actions to be
% B2 l* E! w1 H: U8 @    // executed in a specific order, but these steps should) z  a% a& r8 q
    // take no (simulated) time. The M(foo) means "The message2 V! O2 R5 R0 w, o3 H, d' B
    // called <foo>". You can send a message To a particular9 ]0 E6 f2 H1 \& B( a- b9 r
    // object, or ForEach object in a collection.
# K8 O5 g4 z/ t  b3 J, w) n4 R        * {0 F+ W' n* s% l4 f" N
    // Note we update the heatspace in two phases: first run; o1 a' U& ]( @0 N  [- Q/ Z: @
    // diffusion, then run "updateWorld" to actually enact the
1 q/ |: E5 j' s" Y! r7 E5 }! A    // changes the heatbugs have made. The ordering here is
( u. p# s3 A' j# j    // significant!
. k2 j! @" f) f; ^1 P, F        $ p7 U. a% q& a. z! k" v8 K3 W. X
    // Note also, that with the additional
9 ]! R' w# |8 }: X% \% n, T2 {    // `randomizeHeatbugUpdateOrder' Boolean flag we can
$ a, l. t: Y& g9 o4 C. Z    // randomize the order in which the bugs actually run
3 p5 H2 Q, W0 x. x4 f- l    // their step rule.  This has the effect of removing any
' v1 s% N+ t9 G8 L2 F' Y    // systematic bias in the iteration throught the heatbug/ y2 E& ]# j+ k2 w7 @
    // list from timestep to timestep+ U) x1 A" \' D2 M+ f, }  T
        
" t4 A4 r: [, [8 |6 E    // By default, all `createActionForEach' modelActions have
  j: Q* U) W7 {0 ~5 r4 y# M    // a default order of `Sequential', which means that the
& Z4 H! `+ L9 ~; v3 j; S1 n% h    // order of iteration through the `heatbugList' will be
" \3 g. i! B$ y: G    // identical (assuming the list order is not changed
+ z* Y, F" z% D/ r# u' U    // indirectly by some other process).) D+ [2 c7 n- R. Z- J
    * Z( Z- E2 {6 d1 J, F( r# R
    modelActions = new ActionGroupImpl (getZone ());
% y, T- H) P$ w, W3 n4 G. R% e
! a4 |  e- H2 }9 S    try {
5 k1 L1 J% _2 M4 g) X) c, K      modelActions.createActionTo$message
  N2 k5 P7 }( ?4 ?0 x* d        (heat, new Selector (heat.getClass (), "stepRule", false));+ F9 Y5 e" v& y: M9 N$ G
    } catch (Exception e) {
3 m. j) s, v& b7 p+ ^* C      System.err.println ("Exception stepRule: " + e.getMessage ());
+ B+ V. k2 U& p- @6 g2 _0 q% S  ]    }3 a% v+ U; f) v/ z: \

7 T  t2 ^/ E* w. D    try {
( A9 H; N: m  o      Heatbug proto = (Heatbug) heatbugList.get (0);  F9 R# W2 {8 O/ x# y) S# ^
      Selector sel = , Q8 D7 ~" b7 Z$ B
        new Selector (proto.getClass (), "heatbugStep", false);0 P% j5 x( `) J- g& I7 {
      actionForEach =
, d9 _! t2 N- H1 C$ D  T: n        modelActions.createFActionForEachHomogeneous$call( i  V$ ?/ @  I- Y4 O
        (heatbugList,
4 G$ A4 u" j; |         new FCallImpl (this, proto, sel,
: s4 o  E/ c4 F4 |& f. l6 y0 [* n                        new FArgumentsImpl (this, sel)));, O: m$ f+ i9 U4 R* X  M
    } catch (Exception e) {
4 y) {8 B$ o! [! i7 K7 z; Q$ U      e.printStackTrace (System.err);
) ~3 W# u2 Z4 A0 ^$ p3 X8 B    }
; j! C% M! e- Y/ ^, R, m    * @& N- f* G% e; [' r) H
    syncUpdateOrder ();
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    try {$ g# ~: J2 [$ r! c+ U
      modelActions.createActionTo$message " c+ u* D: _0 t" k; x# h& W5 ^
        (heat, new Selector (heat.getClass (), "updateLattice", false));$ w/ P6 [. @* |" W  p' Z* K
    } catch (Exception e) {
) v. Q0 \0 V" V; E      System.err.println("Exception updateLattice: " + e.getMessage ());
& J" x- O; E* j0 F( U7 q    }
0 i5 ~( ]5 v6 y1 @; t. H        
1 l, o1 M% {1 m$ J2 t: s3 r    // Then we create a schedule that executes the& `3 r* Y2 i1 @
    // modelActions. modelActions is an ActionGroup, by itself it
' I2 I" j9 n8 P) p6 c" p) W    // has no notion of time. In order to have it executed in. i7 \* O. L: r4 {
    // time, we create a Schedule that says to use the! I, L5 R8 m% D. G6 g
    // modelActions ActionGroup at particular times.  This
0 J& F4 _# y9 m7 [    // schedule has a repeat interval of 1, it will loop every
1 G% P2 v  G' b    // time step.  The action is executed at time 0 relative to5 }. U2 |& T7 d! B$ l
    // the beginning of the loop.) y' P" Y( P; X8 W$ c" Q8 b
' ~$ j* |3 R# V1 N
    // This is a simple schedule, with only one action that is. V5 V8 }) h. j4 \; W
    // just repeated every time. See jmousetrap for more
) n4 }) J- k5 R& B6 _    // complicated schedules.
! A3 y( F7 {) c% _: ?  p/ p  
& J) t% N9 H' d% o    modelSchedule = new ScheduleImpl (getZone (), 1);$ t+ `9 B4 A# @. ^. G+ @
    modelSchedule.at$createAction (0, modelActions);
, ~* u  c8 R8 _0 F! H* ], X8 O        
* y; c- C: g1 r% y1 Z  T    return this;/ }/ O( T8 W& r) P. m$ i5 H
  }
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