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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:- L% f; [2 W/ O( \# R6 ~4 D( K
# S+ S: h! F3 A* i& z  \9 G
public Object buildActions () {
; q6 ~% A+ ^( J2 y- e    super.buildActions();
- M1 u9 s- q- J$ J2 A' |9 }4 @8 r    0 N1 e6 O8 O$ S6 p
    // Create the list of simulation actions. We put these in+ R' Y2 Q9 z: D$ g1 {* L/ _: k
    // an action group, because we want these actions to be% X/ k# ~2 `& A! A
    // executed in a specific order, but these steps should8 A6 Q9 U! m& a5 W8 ^( x  s
    // take no (simulated) time. The M(foo) means "The message
4 o* R  J) M' D2 X5 |    // called <foo>". You can send a message To a particular) J/ Q3 b* ^6 t) L$ G. j6 s
    // object, or ForEach object in a collection.& |; j: d: b& R% o- k
        
" b0 F6 h- k* v! W+ W    // Note we update the heatspace in two phases: first run: I+ S! H8 i( W+ u
    // diffusion, then run "updateWorld" to actually enact the# r, K  p) f7 Z7 Y
    // changes the heatbugs have made. The ordering here is
& w5 F; Q0 b0 D0 A* R3 B    // significant!2 `1 P- s/ w+ H$ N/ h1 x
        
- @+ b$ j( q  U1 @    // Note also, that with the additional) E4 g; P$ o1 ?
    // `randomizeHeatbugUpdateOrder' Boolean flag we can4 n9 K  l3 I5 r- H1 `9 r
    // randomize the order in which the bugs actually run
) Y' g' v( d% H    // their step rule.  This has the effect of removing any
, X8 z3 O4 p+ _$ g- W* M) a4 h% l    // systematic bias in the iteration throught the heatbug
( k/ X8 D% @: [& f    // list from timestep to timestep
, z! C  _* ^$ v8 F        6 I# d: E2 L+ c- X4 G- Y3 I/ s# c
    // By default, all `createActionForEach' modelActions have
5 W) H- L6 v2 O" r, t    // a default order of `Sequential', which means that the
6 k4 _. h; @) {5 Y1 R7 }    // order of iteration through the `heatbugList' will be1 X' H7 d2 i, H5 C5 G
    // identical (assuming the list order is not changed
( g7 O& e. U4 F    // indirectly by some other process).4 i( U4 H7 J3 P: w' L& c
   
$ V$ H* K0 R: n( U* l% F9 P    modelActions = new ActionGroupImpl (getZone ());: h; w# X2 }( u; t. c/ g
1 B5 j& R- x& E1 P
    try {$ @3 u6 `! N+ r5 i! W) E
      modelActions.createActionTo$message$ }2 p5 [; u0 I2 `9 q3 Z, x3 K
        (heat, new Selector (heat.getClass (), "stepRule", false));7 V5 X5 M5 t, A8 K# J
    } catch (Exception e) {
: }6 h# g$ J. ?; J2 Z  w$ E- t      System.err.println ("Exception stepRule: " + e.getMessage ());
" @0 ~( h8 [# F8 a* T; p) h    }1 J: E( \, s# Z8 G
+ Q: X$ W. [9 u
    try {
: c" k2 g1 _  z      Heatbug proto = (Heatbug) heatbugList.get (0);$ q( Z$ l. e2 L
      Selector sel =
  T$ U; {, N, G2 V6 M( c        new Selector (proto.getClass (), "heatbugStep", false);7 \0 m' |9 A+ k
      actionForEach =0 |% @# z% l; Y" y' h
        modelActions.createFActionForEachHomogeneous$call
& Y+ m0 j$ I( t( H        (heatbugList,2 G; I, I; u2 ]! ?3 k* Z1 L
         new FCallImpl (this, proto, sel,2 v  ]% h, Y+ M1 n' w. P
                        new FArgumentsImpl (this, sel)));& x  [* p+ o( F& \& u% F
    } catch (Exception e) {9 a9 C7 d# S. |1 l; _' R
      e.printStackTrace (System.err);5 b0 C5 t9 j7 v3 N7 ^; S$ Q& B
    }# R4 d: ^/ A0 P0 X6 \- J" T6 y% T
    : {6 L: b( ^0 f( J
    syncUpdateOrder ();9 o' W! J  Q- N: [6 F
  L+ O$ [: E+ i8 F0 `
    try {( j& ?5 i, R0 d# W4 V
      modelActions.createActionTo$message
7 N2 q; r  M" T0 Q; q- G( _        (heat, new Selector (heat.getClass (), "updateLattice", false));- o. F& R0 |  |$ |% ~
    } catch (Exception e) {
) v9 I0 k5 k; h      System.err.println("Exception updateLattice: " + e.getMessage ());
& O4 r2 q: x) B" [$ L4 Y; R6 C7 C    }
# D* E# q5 S. }/ |' F' `" i: d+ j8 {        
( K, {( G- |! l    // Then we create a schedule that executes the
) v6 @7 _) x& Q    // modelActions. modelActions is an ActionGroup, by itself it7 L: J  D5 [3 S1 j& e" o7 f6 X. v
    // has no notion of time. In order to have it executed in
+ Y6 i' E4 M5 a6 d6 Y    // time, we create a Schedule that says to use the
1 |6 b+ J6 q. k% Z# {! |1 q    // modelActions ActionGroup at particular times.  This5 |9 P9 \  ?+ F
    // schedule has a repeat interval of 1, it will loop every$ D* m, Q$ B  [
    // time step.  The action is executed at time 0 relative to1 m8 R+ m) `7 ]2 V  Z9 i
    // the beginning of the loop.2 A4 x5 Z( Z1 R9 Q/ D* T: C

( a& s+ A0 R1 k) g" @    // This is a simple schedule, with only one action that is: w9 o% N7 ~8 v; N! ~- R
    // just repeated every time. See jmousetrap for more" ]# H# K, N7 w
    // complicated schedules.
  k# P" w0 n( h3 n+ E% ~  
: p. J0 p' Q6 i( H    modelSchedule = new ScheduleImpl (getZone (), 1);
  t7 U8 }% Z! e    modelSchedule.at$createAction (0, modelActions);
" M% V0 c% l; `3 @+ |/ c) i        # B1 @: |, j) b" i( v* a
    return this;4 F% ?: }& N" U; }7 L2 e1 o/ q
  }
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