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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:3 ^! Y4 [! D: b

$ Y# z" d/ o* E" X& T+ {# o+ A5 N public Object buildActions () {" D3 K* n) C: W+ K4 c3 o
    super.buildActions();) C- p& D; Z' [' b: U% T
    % [- L3 ]$ k; Q0 R& p" e
    // Create the list of simulation actions. We put these in3 R$ \" U4 Z0 u( H+ l$ [
    // an action group, because we want these actions to be
  z7 H' [" p6 s3 }& f/ d    // executed in a specific order, but these steps should' J3 H# l' U1 C
    // take no (simulated) time. The M(foo) means "The message6 K) e/ u: r: ^; ]4 ~% O* S
    // called <foo>". You can send a message To a particular9 f* W8 `; k  \
    // object, or ForEach object in a collection.5 k# F% y& F7 a" e6 Q: c
        9 l  C. T& h1 i; o
    // Note we update the heatspace in two phases: first run
7 a  {0 U2 J4 w( Q6 V( F; q    // diffusion, then run "updateWorld" to actually enact the
& x. t  h7 t+ z# d7 h! L1 c7 e5 w, k    // changes the heatbugs have made. The ordering here is  s2 L/ D) D$ G/ B
    // significant!% q3 a2 l( a9 ]/ C6 a
        " d8 a1 B9 C5 |1 _: |% N" i# Z; W
    // Note also, that with the additional4 E& I$ @8 U$ Z# l( {# `' q
    // `randomizeHeatbugUpdateOrder' Boolean flag we can* p( h. l! n6 d
    // randomize the order in which the bugs actually run' v3 D3 [& X& x
    // their step rule.  This has the effect of removing any
2 D( J3 ^. `# m, M9 _6 d5 v0 k3 h# w    // systematic bias in the iteration throught the heatbug: W* ^6 J" t. h( T8 d: `
    // list from timestep to timestep, ?" ]- X3 m) J+ ]' o# q) r
        5 h. w' q- ~% |( Y
    // By default, all `createActionForEach' modelActions have. J6 H2 f4 h: G6 C+ Y1 g4 z
    // a default order of `Sequential', which means that the1 u' h  h5 A8 C8 H0 h7 ]+ Z! p
    // order of iteration through the `heatbugList' will be
3 ]" [( l$ |; b$ ^    // identical (assuming the list order is not changed0 L5 M% t2 ]5 J! L6 m7 E
    // indirectly by some other process).' E; t5 s3 f9 {, ~; v5 O& t
   
4 e9 R9 B4 R0 J; J5 e/ {    modelActions = new ActionGroupImpl (getZone ());
0 R/ b1 w2 x% u! L
5 h- w8 }! S. U* @) z- h& n& @    try {
0 O# M0 s0 w# o9 a6 M% F- t3 Y6 D      modelActions.createActionTo$message
: W% y; d! Y( _) ]$ w- Y        (heat, new Selector (heat.getClass (), "stepRule", false));
% T0 i8 _1 M; b# P$ }    } catch (Exception e) {" r2 `( u* k; e6 ]
      System.err.println ("Exception stepRule: " + e.getMessage ());- ^  `- O9 s+ ?$ M6 c) ]
    }
; e+ O$ C1 ?- a3 X4 B( l
$ {! P  b4 `) q! k0 J: V8 _    try {
7 R; J# ~0 f4 S      Heatbug proto = (Heatbug) heatbugList.get (0);4 z9 K0 P( X% B
      Selector sel =
+ q) r4 E5 f  k( z8 E! E) G        new Selector (proto.getClass (), "heatbugStep", false);- H7 s% M8 [2 X6 z& |7 \
      actionForEach =& l6 W+ e& _4 W, i: r9 n
        modelActions.createFActionForEachHomogeneous$call2 T4 f3 a7 d7 M% ^% d
        (heatbugList,, B' K7 g5 ?. W" F
         new FCallImpl (this, proto, sel,& L) e- s( G" v# {8 L7 A
                        new FArgumentsImpl (this, sel)));# N! q) }* M& U3 ^1 J
    } catch (Exception e) {; {0 C5 D# l0 @$ D% l. i' h
      e.printStackTrace (System.err);, M% T5 q3 ]7 ?. b" E0 X8 R# ?( b0 z  {
    }
2 h; ~$ G  l+ k* T# }5 P. r   
' l5 P& U0 _9 W5 F; p  h    syncUpdateOrder ();
' X# {# M% P7 S. Y9 M& e/ R2 |5 l6 ]2 K# ?" J9 i
    try {: P0 |# V  T. B: Z& ~( u; G( m
      modelActions.createActionTo$message
, C* X1 }1 y5 [, n: d3 W# ?        (heat, new Selector (heat.getClass (), "updateLattice", false));4 q4 A% C# s5 h; k, ?+ @& J
    } catch (Exception e) {
7 P" i* W! z% l7 I      System.err.println("Exception updateLattice: " + e.getMessage ());
7 v+ y5 K4 {8 t& S; r    }
1 |7 m. _2 E- ^# G* r# W; B+ f        
3 d% e; g1 V( B( K8 e% l    // Then we create a schedule that executes the0 P0 l7 \7 k1 Q1 o5 V5 [" Y/ w. s1 B
    // modelActions. modelActions is an ActionGroup, by itself it
5 B6 ~- M& ]  K5 o4 v    // has no notion of time. In order to have it executed in" i7 f0 D1 @( c7 w. Z# _) Y
    // time, we create a Schedule that says to use the
$ ?" N& W8 |8 A4 e, Z/ y- [    // modelActions ActionGroup at particular times.  This1 k$ w2 B! W% V  U# ]; J1 z! P$ f
    // schedule has a repeat interval of 1, it will loop every
5 b/ p7 d7 n* a+ o" }2 [    // time step.  The action is executed at time 0 relative to
5 ]4 ~; s+ G; C6 ?4 U    // the beginning of the loop.7 x0 [/ d! Y  {& z8 a" O: ]

8 |0 f3 s  V; |' W    // This is a simple schedule, with only one action that is! w- @  j8 J. B' K8 Z$ `# g/ E
    // just repeated every time. See jmousetrap for more
" }$ \9 e  M& l. ?    // complicated schedules.' C0 A! |4 k1 H0 v4 b+ z) p% ~3 R- E
  " [& @4 _) S% K0 J
    modelSchedule = new ScheduleImpl (getZone (), 1);' `) ?0 G1 q8 z" M6 {) M4 _8 i5 n
    modelSchedule.at$createAction (0, modelActions);
; @' |( C9 T1 f9 Z: N( d        : {' G9 w$ N( R- |  O8 h
    return this;  m9 [% L& Y+ D
  }
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