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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:
2 e7 l9 j+ w) M" Z7 {# z6 E8 Y" o( ]. \6 O: G
public Object buildActions () {
6 P, p& ~& S% q  t7 J$ x/ }    super.buildActions();+ J4 k/ m5 B9 T0 k4 Z/ ?4 ~
   
, B4 S* I* k& A; d3 x3 N  M5 l    // Create the list of simulation actions. We put these in
3 D) G7 `. I; E. G1 c; v6 d7 d    // an action group, because we want these actions to be
& `; F6 N& ?, r* u4 A    // executed in a specific order, but these steps should6 S% ^- B" X" F" C
    // take no (simulated) time. The M(foo) means "The message  P+ @8 J% y/ Q7 z- J% I
    // called <foo>". You can send a message To a particular
0 [2 P7 A4 T  ^' i$ G1 h    // object, or ForEach object in a collection.% V0 \0 R7 X1 i- P# ]6 c
        2 ?# g: h  _6 l9 j  E
    // Note we update the heatspace in two phases: first run
& Z  a+ I6 n% ]% H2 t' d    // diffusion, then run "updateWorld" to actually enact the
* j" y1 a; A/ Y3 P( ^# G0 N    // changes the heatbugs have made. The ordering here is
. I, q3 t2 M9 l6 ]7 \$ P( p    // significant!
- \5 x% n$ }6 _) |8 u        , B& H, {' ]- k' G1 S7 \
    // Note also, that with the additional
$ u9 V" i# O# n; I+ _7 Z3 ]    // `randomizeHeatbugUpdateOrder' Boolean flag we can
. F+ N8 u) M( _6 }4 @* I. g' ~    // randomize the order in which the bugs actually run- d7 _' i/ N- o. R
    // their step rule.  This has the effect of removing any) v( @  d: Z7 j/ X
    // systematic bias in the iteration throught the heatbug7 B4 V% Y+ k9 B; G! M8 \/ E
    // list from timestep to timestep
: j& Z" ^2 |+ ^) H% M( d        / j, r# O' N$ ?' V% b  @& T/ c
    // By default, all `createActionForEach' modelActions have% N6 ~  d* M2 H5 k( Y, K
    // a default order of `Sequential', which means that the
# ?+ P* C( Z& b3 ]    // order of iteration through the `heatbugList' will be' {) }# K! k; p
    // identical (assuming the list order is not changed8 Y) Z3 F3 t1 J! a( p* T- [
    // indirectly by some other process).: q5 B6 S# o+ k. [' u
   
: W$ e0 w- d; S( C! {2 ]    modelActions = new ActionGroupImpl (getZone ());
4 ~/ o# ^9 X& |0 t" {! o; J% o7 F5 ^
: v) a6 H* R# o" j( V0 Y% v    try {
. {' J' k0 k+ ?  k  k- D  L0 p      modelActions.createActionTo$message
! R; A6 Z# C# @! T7 u: V        (heat, new Selector (heat.getClass (), "stepRule", false));! q4 w, A9 W8 |% z
    } catch (Exception e) {
3 D5 f6 p+ D1 i2 F4 V5 M) M      System.err.println ("Exception stepRule: " + e.getMessage ());7 q6 x. ?. Y, n% K! [
    }7 ]! E' l5 W# D/ P1 |/ Y

1 u' ^+ g2 e6 @$ Q) F4 \    try {" ?  \; i* k" e8 u0 {! k6 Y
      Heatbug proto = (Heatbug) heatbugList.get (0);" j1 A4 o* S) o# ~  f
      Selector sel = 3 F/ Y. ^/ S! I: x
        new Selector (proto.getClass (), "heatbugStep", false);0 b/ ~- c; |6 G: Z/ G4 S. s
      actionForEach =7 p/ ?$ }0 @1 C/ N- Q: S0 M
        modelActions.createFActionForEachHomogeneous$call
- D: v. L1 ]+ q: a' F9 s        (heatbugList,
; m$ ^/ o- N6 d) M; O6 N0 I         new FCallImpl (this, proto, sel,# g5 j  n6 v; n! x
                        new FArgumentsImpl (this, sel)));
% r4 A- s* Q: h0 X  m, G    } catch (Exception e) {
5 _* N6 ~0 T: K* g3 N! J5 [$ G      e.printStackTrace (System.err);8 A$ }1 g( j5 I- U4 ?) \' ?
    }
8 j) \2 p. \8 V' ?9 D  {. l   
$ I1 g: W( ]$ a    syncUpdateOrder ();7 @1 y! c( a. U2 x5 F
4 [  S% d/ P0 S3 U
    try {1 i- l4 |* q4 [3 w
      modelActions.createActionTo$message
" ?, J7 G  S1 f' V- p        (heat, new Selector (heat.getClass (), "updateLattice", false));
, d/ P6 b- B8 y    } catch (Exception e) {. H- c. @* k1 W. N1 S
      System.err.println("Exception updateLattice: " + e.getMessage ());
! y, N1 q( l9 b    }
1 p) v) m* ]2 u) F        5 D* Z, R( {1 J5 z0 @
    // Then we create a schedule that executes the) }8 j' H/ L0 G
    // modelActions. modelActions is an ActionGroup, by itself it, X2 |# I$ \2 u# ]0 h) u  p
    // has no notion of time. In order to have it executed in( L  R4 e9 {( C7 |' q
    // time, we create a Schedule that says to use the. a, g7 A% z3 q9 v
    // modelActions ActionGroup at particular times.  This
$ g" U5 g1 T1 h    // schedule has a repeat interval of 1, it will loop every) N) p; j% j- M4 T. l
    // time step.  The action is executed at time 0 relative to
* P4 o. I: e# X8 c1 v5 V- s: M    // the beginning of the loop.
2 H5 v3 O3 J- }+ O  W3 g( k( J+ J# `$ G8 ^* b' R3 Z
    // This is a simple schedule, with only one action that is) ^* N$ L* v: v! ?
    // just repeated every time. See jmousetrap for more9 q4 P$ u5 R4 J
    // complicated schedules.. Q2 `$ I- K! M& e
  
' {: n2 v5 a( S9 f2 G, C    modelSchedule = new ScheduleImpl (getZone (), 1);
6 b6 h" X3 U+ I& I: i- k# i    modelSchedule.at$createAction (0, modelActions);
9 t# [5 n! i! [: D        * @  w+ h8 y" w9 K0 g! U
    return this;
, q9 j- D/ t) c; c  }
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