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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:- z* q& _. y( w/ F6 w

+ ^; T6 B& G; i6 e' ~" k public Object buildActions () {
2 S# `4 e- u% v& p  X1 `    super.buildActions();1 a2 c7 F2 |( R5 d+ S
   
" b- J* V3 E" I    // Create the list of simulation actions. We put these in
6 c$ m! @8 ~; A- A8 I    // an action group, because we want these actions to be
! `. n+ [0 D- i/ m    // executed in a specific order, but these steps should
0 G- z7 R- G4 e7 o* U( p% S    // take no (simulated) time. The M(foo) means "The message
+ V* k& J) ~" B  [    // called <foo>". You can send a message To a particular" u/ e4 h  ^3 k5 Y
    // object, or ForEach object in a collection.4 `" M+ g6 K6 E5 Y; c
        " m; B1 l+ o6 i' |/ B& M
    // Note we update the heatspace in two phases: first run$ j) ?& k' K0 k) z, x
    // diffusion, then run "updateWorld" to actually enact the
8 Q6 ]3 Z/ v& |    // changes the heatbugs have made. The ordering here is
' o" _8 Q# G) m/ ~  [    // significant!
, [3 F& Q) I7 n! t% E0 K        
6 {+ N1 o  z/ H0 z3 `/ _    // Note also, that with the additional! {$ Y  [/ _/ ^! T, s& E7 B
    // `randomizeHeatbugUpdateOrder' Boolean flag we can/ U2 d8 x4 u# H$ L8 R4 \% f
    // randomize the order in which the bugs actually run* K7 X; Q% I4 i7 C- m! ^# t
    // their step rule.  This has the effect of removing any4 P1 K8 e( _: F8 @1 {8 h# F+ ~' v+ i$ X
    // systematic bias in the iteration throught the heatbug6 T& k9 F# \7 A% ?  x+ {# J  i
    // list from timestep to timestep
2 ^! d9 z7 g7 [6 {& r, f- D        
( t! |1 y/ U' v; M    // By default, all `createActionForEach' modelActions have
0 _) X! o- p! i" d$ ^5 x) K, O, }    // a default order of `Sequential', which means that the
. @; {) Y4 F& Q4 ]4 p8 x) o    // order of iteration through the `heatbugList' will be
9 g0 z$ T9 W- n/ m' ~6 F    // identical (assuming the list order is not changed
6 f, \" @! H3 ^5 Q7 I7 c    // indirectly by some other process).
  V$ N. p" T7 l) w. {3 i# Y   
% E& ^9 c$ K8 D% L* G- {    modelActions = new ActionGroupImpl (getZone ());" e7 T! N9 s6 c2 u

! N' i; E5 G- {# D4 _* U8 U    try {
) P5 S5 _* q! Q7 R8 y' |1 r      modelActions.createActionTo$message/ C  {( \- F- t8 x, r
        (heat, new Selector (heat.getClass (), "stepRule", false));
0 d- K3 ], U7 Y$ l. Z1 H) ~    } catch (Exception e) {
" x+ e! \8 M& k  t+ X8 O; ?) C) X      System.err.println ("Exception stepRule: " + e.getMessage ());8 U$ S! a4 K2 e" Y' h- q( }5 W( |
    }
! c; \3 C. f. I% o: l
" D/ Y6 G2 \' F' g: R    try {" p, U2 \: Z7 S' C8 n
      Heatbug proto = (Heatbug) heatbugList.get (0);
2 Z8 Q$ |' y" n5 L% B      Selector sel =
; U7 V9 Z3 r7 X  I8 L        new Selector (proto.getClass (), "heatbugStep", false);
! {9 [* ?" B% h2 j      actionForEach =! u6 v* L( @; I& G) U2 X$ q
        modelActions.createFActionForEachHomogeneous$call
* |1 [  }7 H2 u7 k        (heatbugList,& r9 v+ O9 w8 v& m' x
         new FCallImpl (this, proto, sel,( S; h. y! P; Y) o- @
                        new FArgumentsImpl (this, sel)));# f0 w6 \/ v2 `
    } catch (Exception e) {# h. G  S: [9 ~
      e.printStackTrace (System.err);; _: T- W! I8 [! ]: x# \
    }" J! I! ^/ a& M2 a7 v
   
- @: D' o' w8 ^7 ?. s    syncUpdateOrder ();
1 |, ^) Y& Q, @  u& |5 Y
9 v7 I0 D- @; o    try {
4 q9 i; F7 B  B7 B5 m3 ?. i      modelActions.createActionTo$message
* ~6 J  U1 p, r3 e5 O, `        (heat, new Selector (heat.getClass (), "updateLattice", false));; I) Q$ N) H9 J: a
    } catch (Exception e) {
* g. n! i8 k( F+ |; z  _# t      System.err.println("Exception updateLattice: " + e.getMessage ());
) ~6 E# {$ q, p# b5 a0 z) \    }
  o$ S, D8 Q6 S4 |; M% @+ ~        
& e. E( ?# A' _' l    // Then we create a schedule that executes the
- _# Q9 s; G" {4 S$ Q    // modelActions. modelActions is an ActionGroup, by itself it
; Q; @0 m7 ~- C; t+ B) J6 S    // has no notion of time. In order to have it executed in% D9 b2 ^" ?3 f  G$ V- O* s
    // time, we create a Schedule that says to use the6 [  I% H* ^  C$ e8 \( E
    // modelActions ActionGroup at particular times.  This( _5 W& P2 _* I( h# o8 f* r8 {4 F
    // schedule has a repeat interval of 1, it will loop every, c  s) a( ~6 ?, ]/ f& _
    // time step.  The action is executed at time 0 relative to) r" E, {2 F* R! X7 G3 J8 @
    // the beginning of the loop.2 }3 o# W: U" r5 q2 K! A

, w# N( f+ y' Q7 [- R3 O    // This is a simple schedule, with only one action that is4 h8 {  }- k; D# U9 a7 @% o- t+ F
    // just repeated every time. See jmousetrap for more5 c& D0 ^" `4 j2 w% y
    // complicated schedules.
$ X2 ]. a( ^# l9 `4 e* p3 }  
, L$ A) v9 c# B1 e3 ~    modelSchedule = new ScheduleImpl (getZone (), 1);
  H; {  {5 {& T3 \( }    modelSchedule.at$createAction (0, modelActions);
) h9 W( {$ V& j4 w        7 H9 M% i5 G: [! ~# H; o
    return this;3 R% F" [$ O& U7 I; G6 _+ P- J
  }
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