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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:
& x2 Q% F) M! D: s" N$ y
/ t" S4 V# I) P/ Q* c1 n4 q public Object buildActions () {
6 X8 u% ?3 |9 D! V0 s: G8 ?% t    super.buildActions();
3 V) \; j$ o' D  `% h  x! f, O    ; f" d: C: W) t2 A, B- Q
    // Create the list of simulation actions. We put these in, U- b: l% i% `/ b
    // an action group, because we want these actions to be' l/ N* }$ O3 ~/ I9 y. k
    // executed in a specific order, but these steps should- X7 `- _; }9 x
    // take no (simulated) time. The M(foo) means "The message
! u& l; i% M8 D! q    // called <foo>". You can send a message To a particular
" l& E' \4 W, s6 N' ]6 D    // object, or ForEach object in a collection.
+ G' v+ x( i) J$ b" l7 e, s        
3 [1 e% R4 L1 z% ]3 Z( h    // Note we update the heatspace in two phases: first run
# O6 ?% ^: C5 b    // diffusion, then run "updateWorld" to actually enact the$ b% d9 S8 V1 i1 G
    // changes the heatbugs have made. The ordering here is4 q: r! L4 I- g" S
    // significant!/ N  e. o2 G0 k; I2 F2 `
        7 x9 c8 f% K% A: Y7 i9 C
    // Note also, that with the additional0 G" K# C7 _$ r( A4 s
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
3 \' ]) n0 o9 F0 P5 [" \    // randomize the order in which the bugs actually run% L9 B' }; `% M
    // their step rule.  This has the effect of removing any+ B2 u8 d0 p* \, M
    // systematic bias in the iteration throught the heatbug$ e; H- z/ t9 g1 f
    // list from timestep to timestep$ w8 R, K  ]/ s7 T4 U& h
        
9 _$ v6 r+ J9 T9 t4 G    // By default, all `createActionForEach' modelActions have6 f, A7 n$ u6 y. ^) ?1 p
    // a default order of `Sequential', which means that the
, U; m+ \# y! l7 ]7 \  C    // order of iteration through the `heatbugList' will be! c! a: N2 ]! O5 K
    // identical (assuming the list order is not changed. A$ M( X% s4 M9 P9 f3 V: U  A
    // indirectly by some other process).
9 Z) ]4 J8 V) i5 [' V    . L# {3 _* [0 {1 i5 z% I7 D
    modelActions = new ActionGroupImpl (getZone ());; M' Q; c0 Z& c$ V; a. F

& w+ f" p0 Y1 \) t; e, e    try {7 B, S1 d- ]$ m2 L& O
      modelActions.createActionTo$message
* Q+ H# D$ z7 w9 [1 p        (heat, new Selector (heat.getClass (), "stepRule", false));
, z8 A% r$ \) T8 N' j; T! G2 ~    } catch (Exception e) {
! z7 v$ q+ \4 R: D  _      System.err.println ("Exception stepRule: " + e.getMessage ());
7 e; w; C$ h% y5 r+ ]" h9 d    }
$ f! C: q% n) C% e* u6 S" u5 D* ?8 g8 i% k& y1 S9 K& Y
    try {: L" @$ y. D# Y2 l
      Heatbug proto = (Heatbug) heatbugList.get (0);
3 O! n: b8 B4 c; `  E; A      Selector sel = / l( o! y9 }8 n0 A4 m! H" ]$ N% j
        new Selector (proto.getClass (), "heatbugStep", false);) x" F, l9 W5 C
      actionForEach =( G- P8 p  n% b: _: E1 f4 e
        modelActions.createFActionForEachHomogeneous$call- i0 R, L# ^: U, o5 M
        (heatbugList,
- C3 ]4 d0 X8 u% A4 u; ?4 Y6 Q# j4 \5 p* c         new FCallImpl (this, proto, sel,, `* C; F8 S$ A, Y
                        new FArgumentsImpl (this, sel)));
: g) @3 w# t$ N; _8 v2 t    } catch (Exception e) {% T6 r7 S" }' g( q" p
      e.printStackTrace (System.err);
  h/ T; m5 O5 }# d' |* S! G    }
  d9 x  \& M" g- Z% Q/ {( v7 z2 X8 r   
, T1 X$ g4 R# k7 w' z- \( q7 r) u    syncUpdateOrder ();
! A7 A: h* c0 k, k6 K
$ \( u: o6 q! C8 }9 m' K    try {1 c4 e1 F: m3 G9 r+ u& N9 c. ?
      modelActions.createActionTo$message
, o. o& j( d) h        (heat, new Selector (heat.getClass (), "updateLattice", false));
- z" J) j9 C6 f5 \& ^8 R# e    } catch (Exception e) {; t2 H" T6 k5 U4 T
      System.err.println("Exception updateLattice: " + e.getMessage ());$ h9 v" [9 s- x: }7 u
    }7 g0 }$ K. o* D' a4 G
        
" l& i8 w5 \  B5 p    // Then we create a schedule that executes the: f8 f9 K' f* @) ]8 K$ T! t
    // modelActions. modelActions is an ActionGroup, by itself it
+ N! h# f& `: X( M2 A5 n/ i' v    // has no notion of time. In order to have it executed in
+ _/ p9 t4 x* a$ k- D4 S. @    // time, we create a Schedule that says to use the
- f# x) D0 i, w- {+ e: F    // modelActions ActionGroup at particular times.  This
" G* d- U1 a9 D. N( S, i    // schedule has a repeat interval of 1, it will loop every' E- [  C9 t* X9 n$ Q( `
    // time step.  The action is executed at time 0 relative to# q: i- g3 r. N
    // the beginning of the loop./ F* V5 H3 W0 W3 N5 O. w

# o, Y4 x# T/ o    // This is a simple schedule, with only one action that is
; K6 A" _$ B5 i    // just repeated every time. See jmousetrap for more7 o2 e4 {( I5 x2 y. ?) T
    // complicated schedules.' x; Q# f* Q! }; d: @0 h, z
  
" O2 l5 K( q3 V/ b    modelSchedule = new ScheduleImpl (getZone (), 1);8 j0 ]1 S0 L- }7 y- R: G
    modelSchedule.at$createAction (0, modelActions);
9 {6 x$ D, T3 A* M7 J/ r        ) |, m8 o! U7 I( J7 z5 ]
    return this;, [- B  O5 `" S" `
  }
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