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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:7 j2 P$ K  M4 z7 S$ Z0 R

3 {+ w5 H+ n- j public Object buildActions () {, x/ y  U$ t' }( N# _- D  h
    super.buildActions();
0 |7 v4 v: z% k* W/ `   
7 U* \  ^! e0 l+ b" f    // Create the list of simulation actions. We put these in
8 C7 [' t" T  L! M. U/ M) W    // an action group, because we want these actions to be
$ k9 e* X" U7 U    // executed in a specific order, but these steps should
/ b4 p3 u1 Y* z8 r  t, M$ ?) y' p    // take no (simulated) time. The M(foo) means "The message( d5 |7 g: S! A2 i8 g  d( l5 r7 r% t
    // called <foo>". You can send a message To a particular1 S- L0 K: F: @1 v+ M; \
    // object, or ForEach object in a collection.
; x8 Y: _$ S2 m& I8 N# \        2 A7 x9 _& r3 e
    // Note we update the heatspace in two phases: first run
1 t- l; b- s. f6 S7 l    // diffusion, then run "updateWorld" to actually enact the
& L2 U0 A5 O: _2 ]0 ]2 z, |    // changes the heatbugs have made. The ordering here is# i4 N0 t' y" U: c" ^2 B9 G
    // significant!& E  M, |6 L& v
        + g& t4 i0 L- O$ H6 ]
    // Note also, that with the additional# J: D! b6 {# w) M' ~
    // `randomizeHeatbugUpdateOrder' Boolean flag we can( K3 X: z7 m' {; W
    // randomize the order in which the bugs actually run
3 }  P* j- [0 p2 h. K& d. G    // their step rule.  This has the effect of removing any  L* I( h- A) |# j
    // systematic bias in the iteration throught the heatbug
' e9 O/ G3 N1 C    // list from timestep to timestep
/ O& _: q  N+ ^6 _- U5 t) V        & e! j+ K& B# ?3 d- p
    // By default, all `createActionForEach' modelActions have! q6 ~6 h' k$ }* f
    // a default order of `Sequential', which means that the. o% V# ~/ y8 y5 }' j, U, B
    // order of iteration through the `heatbugList' will be; c" T' X  O8 u8 J8 B
    // identical (assuming the list order is not changed  {4 L$ E3 i6 y7 h0 h9 e$ u
    // indirectly by some other process).
0 i# ]5 f3 j: ^# C) K! @    ! [0 g0 z) N; |  L
    modelActions = new ActionGroupImpl (getZone ());
% ?2 a+ L1 u  p/ Y
: p7 Q* @4 @( @. x$ q! ?# B* T    try {4 A. O" n( N. H
      modelActions.createActionTo$message
$ P5 G5 Y- A+ C) G        (heat, new Selector (heat.getClass (), "stepRule", false));
6 D- \, [$ s8 \' S2 o+ G    } catch (Exception e) {
# j* x/ K+ i, Y3 ?" \0 [$ s6 k      System.err.println ("Exception stepRule: " + e.getMessage ());  e8 J6 {+ {1 L; Q2 l- V
    }2 F+ c' S9 s) A9 w( T0 W. J
7 o" p+ E! E* Y. \8 `) E4 q
    try {
. i- I9 B# B& Q* C1 |      Heatbug proto = (Heatbug) heatbugList.get (0);
5 I9 U% `5 L* g- B" m0 A      Selector sel =
* E* p0 e* }) f- i0 g8 q        new Selector (proto.getClass (), "heatbugStep", false);
1 }: B2 u% {. F8 s" @9 V      actionForEach =% D0 r( I9 o+ i7 i# P
        modelActions.createFActionForEachHomogeneous$call' |5 G' [5 i# N" y
        (heatbugList,
5 r$ |1 U, x8 h         new FCallImpl (this, proto, sel,
$ O. E2 z8 W4 D                        new FArgumentsImpl (this, sel)));
# p: a9 \9 y& T" I    } catch (Exception e) {
$ K9 H% h) u5 |( B" ]      e.printStackTrace (System.err);
7 h5 q1 `: i' k# {    }
5 r* j' Q" m: c5 I: B$ W   
* Y. U& h; \4 a" h, p7 X    syncUpdateOrder ();
/ _4 e/ U5 W- j' m1 d! n4 a+ p, X" J
- q% E3 X8 Z' F    try {* B" g% z5 m- r# ?
      modelActions.createActionTo$message
5 g( q2 `! g/ K: M+ Y+ D        (heat, new Selector (heat.getClass (), "updateLattice", false));# I% F' i/ `  N4 z5 O; P
    } catch (Exception e) {
% t6 c( p; \, W% P" @6 r8 R      System.err.println("Exception updateLattice: " + e.getMessage ());
5 N5 ^5 R% \$ d# q    }# b0 N3 m) z3 a- ~7 }+ `0 I
        + N8 B. Q9 b' L# [+ ]  F
    // Then we create a schedule that executes the& [4 Z- F3 J0 [+ W
    // modelActions. modelActions is an ActionGroup, by itself it0 }9 q9 y4 S9 h- e: _3 g3 J0 H
    // has no notion of time. In order to have it executed in6 V  t. w$ o3 X# s8 k' v
    // time, we create a Schedule that says to use the# }4 ~( B2 o' c% u/ n
    // modelActions ActionGroup at particular times.  This
/ ?9 k4 p/ S( @7 K    // schedule has a repeat interval of 1, it will loop every6 K$ \5 Y) {# V5 h) d1 W
    // time step.  The action is executed at time 0 relative to; j' e: v5 @1 f3 N; ?
    // the beginning of the loop.0 i8 i7 _/ U: O6 r) l/ x

+ Y$ ~- q1 V8 |- m; \% y- n6 F  F    // This is a simple schedule, with only one action that is
6 F# O, G" s1 |* ]    // just repeated every time. See jmousetrap for more. F* P9 W8 t' Y
    // complicated schedules.
% k( y, h; I) a( e+ h+ }. v! J  
0 x$ U$ x7 U# n$ B: a    modelSchedule = new ScheduleImpl (getZone (), 1);
- q& k3 o+ j6 X) O7 ?: N    modelSchedule.at$createAction (0, modelActions);
/ A% H, g5 g6 u. E5 ~        
  X  y. o3 b# P4 b; ]    return this;3 @& z- h$ p, u, U
  }
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