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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:+ k6 f; U2 Y) ~4 q' x( Q
4 w1 v. `5 g7 L9 M- d
public Object buildActions () {
) q/ f# g( g& i1 E    super.buildActions();* @4 `- u. y1 Z" b+ ]* u4 h
   
# G1 H( b  ^5 K/ C    // Create the list of simulation actions. We put these in1 D5 N" ]: @1 t( `
    // an action group, because we want these actions to be
4 J" H" b, v1 Z( ?3 P- u    // executed in a specific order, but these steps should4 M( v/ H5 a8 w8 }: R
    // take no (simulated) time. The M(foo) means "The message, E1 {: z/ W9 a+ i+ F
    // called <foo>". You can send a message To a particular4 t& S9 c( ?* y( N
    // object, or ForEach object in a collection.5 f$ e) Z; [1 B6 e: k$ a
        1 P8 C/ T& R* X/ c/ I* d
    // Note we update the heatspace in two phases: first run/ z7 ^, X; S4 E' n, K
    // diffusion, then run "updateWorld" to actually enact the
; H& I; X, X. I  y    // changes the heatbugs have made. The ordering here is) a" |; {6 b, N, {; `% x
    // significant!
3 k; c* d$ A, X  M        & X+ f; B" U- I
    // Note also, that with the additional2 V9 k# c1 ]7 A; d2 Q: Z- u
    // `randomizeHeatbugUpdateOrder' Boolean flag we can; D* m8 o$ i+ b, x. v
    // randomize the order in which the bugs actually run7 |% Q$ J- R5 J! r* [% B
    // their step rule.  This has the effect of removing any8 x0 X5 ?/ z* i1 z/ s& x6 ?
    // systematic bias in the iteration throught the heatbug
# L& t  [8 S0 i2 _  f5 h    // list from timestep to timestep7 c" y- v0 A" b
        % [' ~' Y/ m- S7 z9 K/ r9 s" d
    // By default, all `createActionForEach' modelActions have
7 r4 `1 G+ A. o/ L    // a default order of `Sequential', which means that the
. l) @9 G, H" F+ `9 |: D5 h    // order of iteration through the `heatbugList' will be
2 K- q" I5 i; _5 K, W2 r- u    // identical (assuming the list order is not changed7 F9 w1 l3 W) h9 l/ V2 w
    // indirectly by some other process).: w% Z. m! H# D/ a8 [2 ~
    * E7 `( O+ k; P& ]) P+ `% {
    modelActions = new ActionGroupImpl (getZone ());
& _2 p! b% c* r: b2 S! P% J$ ?5 o6 g% f  O. Q. `
    try {
1 m( Q" d% `+ [1 R" n+ b& C      modelActions.createActionTo$message
, |: q: s1 ~6 b) Z3 I' @        (heat, new Selector (heat.getClass (), "stepRule", false));5 S8 C2 ?1 r, z) {9 t7 d" A" ^; b
    } catch (Exception e) {
6 ^/ u: n" N4 r* l3 G. [: M      System.err.println ("Exception stepRule: " + e.getMessage ());
' x- |: v1 b3 e    }
! f& w5 z" L% M3 J% ^0 m" [3 Q; i2 T, I; j
    try {
9 m4 v$ G7 ^% n. a      Heatbug proto = (Heatbug) heatbugList.get (0);
% ~! O4 k8 n' C, I$ C2 l1 K& R      Selector sel = ! N  z9 u7 L* q: I' A
        new Selector (proto.getClass (), "heatbugStep", false);; g5 d# W* [6 b# l, W; [& \  q
      actionForEach =) ^4 k- P: E3 M9 _- I% ?7 T9 y/ b
        modelActions.createFActionForEachHomogeneous$call
# L' F2 m' J1 S; ]        (heatbugList,7 @2 r. g+ i/ i9 i4 |8 p% Q: D) H
         new FCallImpl (this, proto, sel,$ T6 P8 I5 y' A- o, a3 O. t( o% R
                        new FArgumentsImpl (this, sel)));
6 v$ R2 p$ C# v! g  R! B+ ~    } catch (Exception e) {2 {6 j1 I2 ^8 ]/ C8 _( r
      e.printStackTrace (System.err);  ~" q/ W# R6 P6 J4 ]1 u, E
    }8 D* i+ C0 u4 e
   
5 r  C% I7 U, [& s: s/ F. p    syncUpdateOrder ();* g; v# c5 @$ r  V* B3 \% ~& G; p

4 X, h4 e0 ^+ `8 _- \3 {    try {; r$ b+ [( V% Y
      modelActions.createActionTo$message
6 p; o4 v- x' k2 j/ o        (heat, new Selector (heat.getClass (), "updateLattice", false));/ H( }6 b/ j3 L& |
    } catch (Exception e) {
& P, S: r$ I) {' R/ y1 @      System.err.println("Exception updateLattice: " + e.getMessage ());
1 R# P+ d' m" {    }
# @* i, G1 B+ X/ |# u+ }" k2 V        * g. ?2 _5 i' K' ^& {/ V/ ]
    // Then we create a schedule that executes the+ N* s, k7 u5 f+ i
    // modelActions. modelActions is an ActionGroup, by itself it7 u' R! J% d# }1 i8 w% g3 \' r; f
    // has no notion of time. In order to have it executed in
" ?, j! x4 n" b* O! C" g    // time, we create a Schedule that says to use the; O6 W+ y+ Y0 m1 a  ^
    // modelActions ActionGroup at particular times.  This5 p7 [. z. ~0 B0 H& O' Z% c
    // schedule has a repeat interval of 1, it will loop every
' m, ?, H1 @3 H8 T- Y    // time step.  The action is executed at time 0 relative to' t8 J/ X9 @% w& [7 @
    // the beginning of the loop.
$ \4 O  {( }" q/ x
8 E, K! ?3 G3 v/ Y/ k* G    // This is a simple schedule, with only one action that is$ I' t5 w1 k3 M& m5 P( v& U
    // just repeated every time. See jmousetrap for more
& P( R/ C  P, s/ T: m/ X$ m, {    // complicated schedules.
8 ?1 z  m4 p9 |$ U  
: j! F' @! n4 D  v" c$ X    modelSchedule = new ScheduleImpl (getZone (), 1);
. V9 ^6 W/ c$ G# d+ {7 F; f    modelSchedule.at$createAction (0, modelActions);
% |& n, w/ |$ e3 F5 j        + t# R. H2 X9 P& y6 e/ q# L
    return this;
0 T* @2 M1 r) c" t5 f: W) L' D: c  }
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