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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:
, i( z8 w& q' g, X$ d+ c9 r' s
" a( i; |2 M4 I& c" a0 R, X; V8 {& b+ C public Object buildActions () {+ `* M# J5 p2 r' C6 r
    super.buildActions();
2 `# U. s. S' z( D% D1 D   
' }( b9 l9 O/ T6 m# c4 X* G    // Create the list of simulation actions. We put these in7 B6 q! r6 h9 @- ^! c" |0 g+ _
    // an action group, because we want these actions to be
% c1 S: H# ^$ `3 ]) i    // executed in a specific order, but these steps should+ d% C! z) w. D+ V
    // take no (simulated) time. The M(foo) means "The message
& v% }. Z0 c$ O" W. }2 [    // called <foo>". You can send a message To a particular% B4 ?9 o3 c! g* Q" A2 I
    // object, or ForEach object in a collection.
) h! m- }8 V4 a/ L        ! a, D# S+ e* b% d  D8 B
    // Note we update the heatspace in two phases: first run
) V; l- a- p6 w    // diffusion, then run "updateWorld" to actually enact the
2 Y  ~3 P0 ]! V1 _3 T8 l    // changes the heatbugs have made. The ordering here is
! ~  H# t  }/ h$ K1 ^1 B  h" M    // significant!
4 S: g0 V1 y+ j        
7 s: _1 q2 Z! c- O$ t" K% e    // Note also, that with the additional
' f2 d  u1 ^, F# ?    // `randomizeHeatbugUpdateOrder' Boolean flag we can% D' W! L0 {7 p$ }% N8 w
    // randomize the order in which the bugs actually run
! J* R8 m5 A" A    // their step rule.  This has the effect of removing any
0 P, o1 H$ P# m$ f5 g7 ^& r    // systematic bias in the iteration throught the heatbug8 a0 p; Z+ w3 X; L( c. t7 o/ ~
    // list from timestep to timestep9 }- s: ]5 k, s) [" I. E4 c
        
4 v5 Y$ g) w! t% x    // By default, all `createActionForEach' modelActions have
: R6 J' u1 U+ w5 |, h3 ~    // a default order of `Sequential', which means that the
5 n4 p8 ~- }  c* r, }& k: ?$ \( b    // order of iteration through the `heatbugList' will be
. Y, f. X" ~/ y9 j6 r, c" r0 o; b    // identical (assuming the list order is not changed
7 r1 \# L9 X. b7 N3 [. H    // indirectly by some other process).# ?; J+ H' G& e9 y
    8 X4 i; e$ Y+ J! g4 ?# }2 e
    modelActions = new ActionGroupImpl (getZone ());
& Y5 W. g3 _! }, ~) a0 F# _# F+ S/ P2 C6 m! C: }
    try {
8 }/ b2 [1 I2 u% W  W# Z      modelActions.createActionTo$message! I* b* b& f+ y
        (heat, new Selector (heat.getClass (), "stepRule", false));- D9 M3 E2 t* U6 y- ]/ S1 O
    } catch (Exception e) {- w- `6 V$ B, O; [
      System.err.println ("Exception stepRule: " + e.getMessage ());: v! z- u9 ?0 k' L4 n( q9 }7 B5 {: Z
    }
3 h% ~2 M$ f1 E) i9 P# P8 D
( \% I; T5 n9 L0 Q( z+ U& F2 v    try {
" `  K# c$ d: L6 ?6 a4 c; g      Heatbug proto = (Heatbug) heatbugList.get (0);
( S" J+ D: B6 H! f  d3 M      Selector sel =
9 b" C7 p3 F/ i4 I, i0 l$ s        new Selector (proto.getClass (), "heatbugStep", false);" R+ _% |. k$ U  I" h7 O, e
      actionForEach =
, M. A7 S: T7 o( `& M( F        modelActions.createFActionForEachHomogeneous$call* J4 h3 T1 S  |: C" T
        (heatbugList,
: x' o# j: U! H- N% A+ `# y         new FCallImpl (this, proto, sel,6 J- s! U% I2 P4 Q' R8 u
                        new FArgumentsImpl (this, sel)));
" ^1 P/ y2 W  e* J9 S    } catch (Exception e) {
  o$ b" e9 G# d0 B+ h4 a. s" [: x      e.printStackTrace (System.err);
, {5 X/ ?# l1 c; H+ G/ C( h    }
* u& l8 ^9 ^; P5 }2 [   
6 l! q0 v( K2 X: ]! d+ ^    syncUpdateOrder ();! ]& W: H, g. t- Z: k& _- f5 u% M9 U7 q

. a  ^& S* G2 N& S1 _    try {2 Y( I! a3 B' V
      modelActions.createActionTo$message
$ ]7 j' w0 k, e7 G# }, O        (heat, new Selector (heat.getClass (), "updateLattice", false));
2 D# ~6 Y) \+ Q0 h+ R: G    } catch (Exception e) {. e# ^5 k2 r, I# w1 Y0 O
      System.err.println("Exception updateLattice: " + e.getMessage ());3 [4 ^/ ^7 W4 h
    }) K. t( S/ Z. X$ {/ m- D& X9 N
          p+ ]  O' e! k
    // Then we create a schedule that executes the
% U( {- G9 h  r0 t5 J8 l    // modelActions. modelActions is an ActionGroup, by itself it8 E- D* c/ d) n& C
    // has no notion of time. In order to have it executed in
' v- F" m9 A  V# I) g) m6 p8 f    // time, we create a Schedule that says to use the8 [0 V$ r. J& v2 [6 U) f" x
    // modelActions ActionGroup at particular times.  This
& }( Q2 g2 y+ x    // schedule has a repeat interval of 1, it will loop every
' x1 {/ M: _! s4 u) C% x  T: D    // time step.  The action is executed at time 0 relative to
5 ~: i) Q) K! e9 k    // the beginning of the loop.
6 p* k* Z  [. k# e. |' m% F8 O3 ?5 l: @/ w& f- x# J
    // This is a simple schedule, with only one action that is* J1 Q7 B# @" a/ b2 X  h# p: z
    // just repeated every time. See jmousetrap for more# ]5 J# s, B, @1 u* y% N* o
    // complicated schedules.5 l8 b. m, G  s6 h: j9 K
  
5 @6 g, M8 K& r( \; A& U6 l- @    modelSchedule = new ScheduleImpl (getZone (), 1);
+ V) H/ \- @( {    modelSchedule.at$createAction (0, modelActions);
. ]  B+ O. Z* [5 M) {* i        & y- I5 b) V5 Q% z2 w; r
    return this;$ |* T- o1 k3 {- f; a
  }
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