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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:5 i. b7 E5 v# X- I" x5 F! z

# O$ V+ u# k" ~6 |' K2 ~ public Object buildActions () {5 @# Z  N+ |( S; O
    super.buildActions();4 S1 l5 K/ ~, g/ ~2 Y
   
; R2 O, G8 H1 r    // Create the list of simulation actions. We put these in
+ H7 M, \* B; y  t4 S" w% D    // an action group, because we want these actions to be
- B5 t2 N2 O7 C2 f    // executed in a specific order, but these steps should
& ]/ M$ A! [# J8 u    // take no (simulated) time. The M(foo) means "The message
7 \: y" h  p+ T' _9 \, q: C0 q( Y    // called <foo>". You can send a message To a particular
; i% l5 x, |" z( j, t    // object, or ForEach object in a collection.
8 u& N/ T* E" a. R5 ]        
1 [, a8 M5 k# R: }# `7 a  z' g, C    // Note we update the heatspace in two phases: first run# _4 A/ x! H$ }- Q1 N' D3 U
    // diffusion, then run "updateWorld" to actually enact the4 R- \2 [/ n% K* R* y+ d% B
    // changes the heatbugs have made. The ordering here is( ]* p- N: a% u; s+ h: v. i
    // significant!, i% S( b- Q1 S: U; t
        ( q  q) {  x! N/ o& r
    // Note also, that with the additional
. u5 {: x, L- I2 f* m) Z    // `randomizeHeatbugUpdateOrder' Boolean flag we can) a5 _( y5 p; @/ w
    // randomize the order in which the bugs actually run8 n% l1 Y* R+ `6 l  j
    // their step rule.  This has the effect of removing any/ ^+ m5 P2 L2 e, L  D
    // systematic bias in the iteration throught the heatbug3 U3 r* u! ^% p6 |$ |! s
    // list from timestep to timestep5 Y$ W% Q3 ^+ K& v  |7 m8 E. d% x" d
        
% }0 q6 A6 s, x+ X    // By default, all `createActionForEach' modelActions have
" N+ b3 H( i' j* K6 e. T    // a default order of `Sequential', which means that the1 a0 j: X2 ~( Z% s6 O
    // order of iteration through the `heatbugList' will be9 ?8 W! R9 W  h
    // identical (assuming the list order is not changed
5 Q2 i. a% U' v2 H: E7 ^    // indirectly by some other process).
( b7 S6 W3 K5 A- f  Y7 C1 `- l    - {& B4 R0 T" l
    modelActions = new ActionGroupImpl (getZone ());+ C6 _  Q- W+ w: R" n/ y9 f

; {+ V7 A" X! Y( ]- W. d! \    try {2 q% z& A5 I' a% O' D5 ~
      modelActions.createActionTo$message7 c3 m' O% J/ ~6 l# E: A
        (heat, new Selector (heat.getClass (), "stepRule", false));
) O3 M; m# r, o; ]; N    } catch (Exception e) {
* V) ^, N6 p# N      System.err.println ("Exception stepRule: " + e.getMessage ());( \% B7 u7 x% j' d: c4 K5 S+ @, v
    }, ~6 K2 K/ R9 j& A
  @. i3 `; f7 N& R8 u
    try {9 E2 O" p1 c$ w( O2 S9 i2 {$ Y
      Heatbug proto = (Heatbug) heatbugList.get (0);
4 [  B  m3 l$ d      Selector sel = ! b: B/ {) ^3 H
        new Selector (proto.getClass (), "heatbugStep", false);
. I: ^8 X) i5 K9 ?& U& e9 l      actionForEach =
! L  W5 s$ o6 V& t        modelActions.createFActionForEachHomogeneous$call
& c2 F0 s% S" U# l# [* e7 T        (heatbugList,: b( G2 p5 T) a9 l6 H; i2 g
         new FCallImpl (this, proto, sel,
) u7 d; j$ y$ \                        new FArgumentsImpl (this, sel)));6 B- [; |' c6 P/ `, S3 Z1 ^
    } catch (Exception e) {" I6 w/ D6 w1 l0 }: r# s
      e.printStackTrace (System.err);+ M7 ]( \7 Q, C+ h# m1 a
    }* t- P& E$ L% [8 ]8 R& E' {
   
5 A! p8 m. t/ \1 t9 Q    syncUpdateOrder ();) U1 x6 R2 U: N& Z
2 V; ?  A) k, i
    try {
" C; w: K; Q: t7 P4 Z- [      modelActions.createActionTo$message
' @9 O7 `3 j" s% N# c3 S! k. [$ T        (heat, new Selector (heat.getClass (), "updateLattice", false));
1 w" g9 Z' C' R    } catch (Exception e) {5 h" u' g9 ]) t8 y4 _8 J
      System.err.println("Exception updateLattice: " + e.getMessage ());
5 f( ]; k2 |, H, c+ r    }. n1 X2 _* B' m1 @# `! D2 z  C9 ?
        3 n/ _- e( H8 ~. i3 W6 P5 h
    // Then we create a schedule that executes the
# I7 X& v( ?/ U; L5 |1 T% k    // modelActions. modelActions is an ActionGroup, by itself it' O5 q$ K0 @, R# v
    // has no notion of time. In order to have it executed in2 F7 ~- H& Q/ ?  _8 H2 {
    // time, we create a Schedule that says to use the
# H8 p1 o& w  _! y/ E5 s; j    // modelActions ActionGroup at particular times.  This( w3 |. f. p0 }& m* I. o
    // schedule has a repeat interval of 1, it will loop every% M3 R$ Y2 [/ P2 P2 T
    // time step.  The action is executed at time 0 relative to
/ ]4 N+ {) I$ d9 U    // the beginning of the loop.* S. \/ h9 s# [: w! ^
) C' B( W( i: Z7 _
    // This is a simple schedule, with only one action that is
# y: Q: O, ?1 z! i8 z    // just repeated every time. See jmousetrap for more; n# d. L6 f# i; l+ w) t
    // complicated schedules.
+ p5 f- ~& R8 m! @4 b0 ?  
; K+ }+ G1 Z5 k8 M4 _    modelSchedule = new ScheduleImpl (getZone (), 1);4 w3 k. T* Y) y. F9 v, ^" _
    modelSchedule.at$createAction (0, modelActions);% `) F# z3 X/ R( Q
        
; j2 s  U% M4 C2 M    return this;4 T6 b# u- O% e3 v9 D0 b- |9 k; i
  }
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