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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:8 @0 C; B& E5 A9 @+ d
! n" C" {. a' \
public Object buildActions () {
! {9 K' c5 r0 @9 G: i    super.buildActions();0 X8 y) h% I+ p7 _* l" G
   
* A2 ]% ^7 S7 Y0 D    // Create the list of simulation actions. We put these in
; ^0 _( U3 U  d; d6 M; m4 ]    // an action group, because we want these actions to be
+ b& k, r9 M3 z$ I    // executed in a specific order, but these steps should/ [. O5 [7 G0 ?( G9 C+ R
    // take no (simulated) time. The M(foo) means "The message
; c$ _! j2 ~5 g& T& ^5 W    // called <foo>". You can send a message To a particular
9 k: I" w9 ]9 O, |' m    // object, or ForEach object in a collection., P! |! X& L1 \5 t# I
        
# ]" |! v; L& A( }' i    // Note we update the heatspace in two phases: first run
1 {" e2 p' \" U2 d+ ?3 I    // diffusion, then run "updateWorld" to actually enact the# w: j3 f3 F& _; s8 {/ y! E
    // changes the heatbugs have made. The ordering here is
' [' |8 @3 {: R3 \* k* }    // significant!1 Y0 R! K+ R% F0 i8 Q# ^
          T! T7 {" K3 y9 |
    // Note also, that with the additional" i8 O: a( S7 P( _" X
    // `randomizeHeatbugUpdateOrder' Boolean flag we can' N  _; v1 V$ _  T1 n* u4 X
    // randomize the order in which the bugs actually run
! H# L+ w/ ?  c0 q    // their step rule.  This has the effect of removing any
/ ^) H7 M% Z$ z' K    // systematic bias in the iteration throught the heatbug2 `: W- @/ `3 z3 M- T8 V' b
    // list from timestep to timestep
0 G/ T* D, }  Y        4 @1 `# l( x3 Q! H" v; _" o
    // By default, all `createActionForEach' modelActions have9 U) U! ?( p, Z/ q7 A! k) ^4 f
    // a default order of `Sequential', which means that the
1 ~- b3 ?& Q/ X( |2 G    // order of iteration through the `heatbugList' will be( ?  K+ [3 r, G8 V) f% ]( W
    // identical (assuming the list order is not changed
0 k" z$ B( ?( w3 X2 \% j    // indirectly by some other process).
1 L' B4 o- D/ m    6 z4 w* l( C6 T8 x
    modelActions = new ActionGroupImpl (getZone ());3 S5 W5 N1 ?) E5 U0 X
5 L# z; o  b8 h- i7 w) I
    try {7 g0 X" y6 w$ w& J
      modelActions.createActionTo$message- h& }8 i% c. g: r- T
        (heat, new Selector (heat.getClass (), "stepRule", false));
" v: E0 C( G" f& p4 k* {5 x3 @    } catch (Exception e) {# P8 i% S: O6 d8 i5 c4 E7 i
      System.err.println ("Exception stepRule: " + e.getMessage ());
5 w, `( d; C% ?' e0 c) N! V    }
! ^' a  `+ c7 w! |: I
! f( }. K% n/ W2 L    try {
8 [9 h5 R& k& P* A      Heatbug proto = (Heatbug) heatbugList.get (0);& z9 c  q+ Z6 }7 R0 B2 s
      Selector sel = - p/ h6 p+ G+ B' w
        new Selector (proto.getClass (), "heatbugStep", false);
  S/ U1 i9 M1 ^4 R8 m      actionForEach =
* [+ W- i& C6 l, D3 S% ^8 k        modelActions.createFActionForEachHomogeneous$call/ F/ Z7 o6 Z" c) N! _
        (heatbugList,
6 K2 v! {8 u% S! s# q5 w         new FCallImpl (this, proto, sel,
& u7 V) \4 O0 R0 k                        new FArgumentsImpl (this, sel)));
' t5 }. D2 U. O' w& l8 H2 T    } catch (Exception e) {2 q! [( y2 ~+ [% j( Y
      e.printStackTrace (System.err);
1 m) [+ h5 g1 a  @" M$ m( B    }
) T6 [6 F# e) ?  Y: d    9 C  M7 Y/ e6 o/ U
    syncUpdateOrder ();: {; G) J+ T/ |  _" o0 e; W; W$ I

1 U, E$ l- W* u4 S    try {. R- y7 A1 y. h  m  ~
      modelActions.createActionTo$message
7 K  F& v0 v  P: q. f        (heat, new Selector (heat.getClass (), "updateLattice", false));. b6 o" F' J: l4 r
    } catch (Exception e) {; n$ Y) A: A3 @! ?( q
      System.err.println("Exception updateLattice: " + e.getMessage ());
3 u) ?# ~/ z3 p) R/ h! }    }9 i$ F, L' J1 S& P
        
: ?$ c2 S: \6 o6 c; J0 k  n3 l# ?! L    // Then we create a schedule that executes the
! H0 g9 ?* o: g    // modelActions. modelActions is an ActionGroup, by itself it$ o) y: }6 @9 d  j; Z4 b# s) h
    // has no notion of time. In order to have it executed in  B. t2 v; M# K  n9 A: X) |
    // time, we create a Schedule that says to use the- U% V, H! M4 e7 w  ^3 r" R
    // modelActions ActionGroup at particular times.  This
+ G. R+ _/ U% f    // schedule has a repeat interval of 1, it will loop every
* ?6 r' g/ o$ r    // time step.  The action is executed at time 0 relative to' f  d" B! ]6 u  m
    // the beginning of the loop.
6 q/ o4 B7 x' L; [
# R4 x! |" L0 S$ L4 f4 e    // This is a simple schedule, with only one action that is7 A3 y( n) c  F$ b! l
    // just repeated every time. See jmousetrap for more( n& }( D3 g) R6 p$ W/ T$ ^% z
    // complicated schedules.( b: }* ^7 e" a) `
  $ S, h) f0 W" q( F  Y% u$ O) p
    modelSchedule = new ScheduleImpl (getZone (), 1);
; N( Y* j+ h3 f  O: }7 c1 G4 k    modelSchedule.at$createAction (0, modelActions);
, t0 e  d" E. `/ B. O0 y  A4 J' E        : i) S- A# `! ?8 _
    return this;3 _. @+ L% g/ ?. ~1 J& X0 D% v% L
  }
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