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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:) W! b/ C, |5 T6 q8 R: a

) e" |2 }, p# t# } public Object buildActions () {
+ a  M( I) d0 Z2 o    super.buildActions();% o. E+ d* Z0 [& ^% ]4 e
   
( X' L9 I; X; E8 o    // Create the list of simulation actions. We put these in
8 C: v$ ]/ s$ w+ ]) E4 j: z    // an action group, because we want these actions to be. c- \  f, Y5 k# S0 U, z! R
    // executed in a specific order, but these steps should. c0 Z+ s% Y8 y+ `& T6 Q
    // take no (simulated) time. The M(foo) means "The message9 x2 [, f2 z& X: x. V
    // called <foo>". You can send a message To a particular4 r  w1 t  c1 ^6 `+ K! x
    // object, or ForEach object in a collection.0 a* \9 U% X2 j
        
( C2 C1 S( d: i+ }+ l    // Note we update the heatspace in two phases: first run: I, X& d# E( S% D
    // diffusion, then run "updateWorld" to actually enact the6 k& e3 h) G0 _
    // changes the heatbugs have made. The ordering here is
  Y# @4 m: m/ N: |( l- r% K  w    // significant!
" e% H% Z& e! U5 E        8 p& |: |; r& b# g& O7 k0 W1 Z
    // Note also, that with the additional+ ]' \; D, j1 v% N# C
    // `randomizeHeatbugUpdateOrder' Boolean flag we can2 H3 _  n8 C7 b! `" W+ T" f6 E+ Q
    // randomize the order in which the bugs actually run
% D, @/ C4 z! \/ Y9 F    // their step rule.  This has the effect of removing any
$ j0 G" P+ c6 t1 f0 ~    // systematic bias in the iteration throught the heatbug$ ?$ x5 [1 R9 v4 `8 i7 f( S
    // list from timestep to timestep- b# x( {0 h9 j* m% _
        3 O6 n, l: m1 d8 z2 C! g# O, {6 @
    // By default, all `createActionForEach' modelActions have
2 K- L" s" P  f: e$ h! }, c    // a default order of `Sequential', which means that the
' f" z( K" k: }. S4 k4 G$ g    // order of iteration through the `heatbugList' will be
6 u2 a3 X+ F% L& _# `  D    // identical (assuming the list order is not changed
  z- W1 B7 H9 o8 n3 o    // indirectly by some other process).
3 F  t' V' I3 v1 I$ ^  }   
+ X2 U; x+ A, ^* T9 J; E- R    modelActions = new ActionGroupImpl (getZone ());/ P# i* {5 U4 v5 o* I
$ b( o- u, ]2 Q" J' O" C
    try {
: K! [$ D0 e5 y  t9 \7 D5 S: y      modelActions.createActionTo$message
3 U2 j0 A0 N- P        (heat, new Selector (heat.getClass (), "stepRule", false));+ V! U1 M" h% [: q; g
    } catch (Exception e) {* }$ r* w  `4 P: t! G
      System.err.println ("Exception stepRule: " + e.getMessage ());/ ^8 O8 O& g0 G3 Z
    }
0 ]# |& P8 p$ M- y) @% s" `
9 s, f( u9 S) ^% X: o    try {
! U1 a. ~: u/ ]: C' k& e, i$ K      Heatbug proto = (Heatbug) heatbugList.get (0);
9 U  m3 p& D0 w5 O# l      Selector sel =
5 j3 C* |) A8 x6 B        new Selector (proto.getClass (), "heatbugStep", false);# C  u; b& w6 o& G) H
      actionForEach =
& h1 M. j) l: _6 u: z+ V5 K3 P        modelActions.createFActionForEachHomogeneous$call, `6 ~7 ?  E" x: S
        (heatbugList,4 O8 ?3 h* d! I3 _- C1 |4 s" a
         new FCallImpl (this, proto, sel,/ _) N/ L) C2 q. K6 ]
                        new FArgumentsImpl (this, sel)));" m$ Q: X7 d1 a: ]  ?* e9 V% s
    } catch (Exception e) {6 }6 w3 U8 P0 i5 q/ p  ~- ]
      e.printStackTrace (System.err);' F$ e% e0 v: X3 Q) f2 p8 A, I
    }
7 g- r7 F& H4 L( g( y: v8 W) I( b" W   
- n# b9 ]4 D  w    syncUpdateOrder ();
2 I  S% r8 t0 u' q! P+ R
3 U+ [1 x* ^" }# J  K    try {
7 c2 k5 A3 B  V) q      modelActions.createActionTo$message
, p! j- [' S6 I        (heat, new Selector (heat.getClass (), "updateLattice", false));
* W4 Z2 ~3 R: S  z6 m    } catch (Exception e) {5 A3 O- i6 E6 @  L$ e
      System.err.println("Exception updateLattice: " + e.getMessage ());: _; Q0 ]3 N+ d6 D# z( T- k5 `
    }
" |; U% Z' R+ _6 U% `        
. a/ k" ]: k2 X! {, N    // Then we create a schedule that executes the
7 f, _# q& ]- n) k& B' C* e- {+ p# y    // modelActions. modelActions is an ActionGroup, by itself it/ J( Z  s* z3 c
    // has no notion of time. In order to have it executed in+ }) p% l! ^& t& p0 c
    // time, we create a Schedule that says to use the5 n1 `4 Q8 v/ F% [( |
    // modelActions ActionGroup at particular times.  This0 k* ^2 ~9 a- S- P
    // schedule has a repeat interval of 1, it will loop every+ `/ P  W! @4 |  @, K
    // time step.  The action is executed at time 0 relative to0 q+ e: R- B  r3 F% p
    // the beginning of the loop.
: [- C' s" v# w) ]% h( O3 u9 [7 A( p  {. d- d$ a/ u
    // This is a simple schedule, with only one action that is
2 l5 F% R: ~9 J+ Q    // just repeated every time. See jmousetrap for more
' w& M  U/ T) h: M2 Z+ K$ N; l    // complicated schedules.
( @( z. H2 h( t3 j  
- q% U0 i8 F/ y    modelSchedule = new ScheduleImpl (getZone (), 1);4 l/ U7 D0 B5 C  D3 P6 D, L
    modelSchedule.at$createAction (0, modelActions);) m9 P& E- |' o% Q1 T' \% f0 S
        
$ r$ e6 H/ j# J    return this;
% @6 C: }% z( @8 `  }
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