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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:
* W0 g6 o* g+ P8 b+ s* x/ Q8 P" `0 ^8 r0 B. J4 g
public Object buildActions () {
) H$ h0 x3 @3 e) z! H# _$ m  D    super.buildActions();6 c/ y  b# S. R8 T1 Z: [+ ^7 C
   
) p& _" f. Q# O: r    // Create the list of simulation actions. We put these in
* E& }) i6 k9 R1 `3 ?" V    // an action group, because we want these actions to be# ^( k3 Z  g; b
    // executed in a specific order, but these steps should( {: w& ]) y7 a- A% [$ ?
    // take no (simulated) time. The M(foo) means "The message$ K6 W5 a* d3 G4 x) t6 t0 V
    // called <foo>". You can send a message To a particular( l/ V6 o- {8 v1 v8 f
    // object, or ForEach object in a collection.! y/ b0 ^5 Z1 t- v9 x: q! Z+ B% B
        7 Q1 a0 Y! ?; L3 X5 R5 `( R5 y
    // Note we update the heatspace in two phases: first run
2 \1 ~, K8 B, k: h3 ?/ B$ I" I    // diffusion, then run "updateWorld" to actually enact the& r9 Z2 T' Y$ A- v- q/ ~0 Z
    // changes the heatbugs have made. The ordering here is7 S' b( ?3 k' O& J, K( p9 _
    // significant!
0 U+ e1 ~6 Y0 V+ u2 p/ J6 m2 O        
% l$ u3 r3 A5 b8 p: o    // Note also, that with the additional
8 F. j/ @' ^7 ^& E$ a# z9 K9 G    // `randomizeHeatbugUpdateOrder' Boolean flag we can1 a. e8 ^! v& a0 [, ?$ T
    // randomize the order in which the bugs actually run4 `& O/ ^! D3 Z! \% r' j
    // their step rule.  This has the effect of removing any
  ]7 C: z( A; h9 S0 u9 x  `    // systematic bias in the iteration throught the heatbug
+ R! d" E# K" W# q$ W    // list from timestep to timestep3 ~7 a$ R) i8 R& b8 D/ {- M
        4 }# r' W4 j, D( d
    // By default, all `createActionForEach' modelActions have
8 U8 _' e7 ~4 D: j! V6 S. J8 v    // a default order of `Sequential', which means that the3 A3 Y3 M* s8 E, g7 |
    // order of iteration through the `heatbugList' will be
! E; ?; a" b% G2 z4 T9 q4 n$ K$ K    // identical (assuming the list order is not changed
2 ]; V) y3 v* U) H9 j    // indirectly by some other process).. E; ?8 O  m' `$ X
    4 e4 ?! o8 {6 l4 \- G" E6 d; |
    modelActions = new ActionGroupImpl (getZone ());
* E  f9 z& l0 ^
$ V! Z1 F5 z( t8 P    try {
1 `$ @/ m& z  g8 x      modelActions.createActionTo$message/ q. L- h9 D+ \/ B" k7 N) p
        (heat, new Selector (heat.getClass (), "stepRule", false));6 h7 Y' v+ w/ s& k" E5 }
    } catch (Exception e) {
- `+ `# N$ i7 |/ j. R      System.err.println ("Exception stepRule: " + e.getMessage ());+ ]" q9 I3 k& v- O2 J6 k4 {
    }
  P7 C5 h. E8 X, }: w, P" @+ _3 r1 g; F* \
    try {6 K1 b/ K5 g/ s% A, Q& {- `
      Heatbug proto = (Heatbug) heatbugList.get (0);, U/ l& [7 i3 b- S( m" B# t+ P
      Selector sel =
8 R0 M- s1 K8 [        new Selector (proto.getClass (), "heatbugStep", false);/ ?% f# m: r) D9 {% |1 o- a$ s( C
      actionForEach =
. o" B7 N' O: n1 u! x8 X5 M        modelActions.createFActionForEachHomogeneous$call
9 K/ h$ j; T4 u( |        (heatbugList,
% M. z* a; X- N$ O         new FCallImpl (this, proto, sel,
- ?/ Q6 m7 _/ t) z% X3 e                        new FArgumentsImpl (this, sel)));9 Y' u% R) x+ M0 \" L3 k( m
    } catch (Exception e) {/ [& ]& N: t$ C! i; C: f5 p
      e.printStackTrace (System.err);  [: C3 V. P4 y
    }& j6 [& C- a( ^% V. Q4 i" ^
   
; r7 ]/ C- v! T& [" w; g" W; X; d    syncUpdateOrder ();' M, f" t  [6 E; _9 `; w. h
, X4 Y* r/ ^& y
    try {
! @' p! o$ \% Z$ }8 g      modelActions.createActionTo$message # D# a) f- P$ N2 N7 [3 Z' T
        (heat, new Selector (heat.getClass (), "updateLattice", false));
' c7 U% [9 }) \7 h    } catch (Exception e) {
7 A4 ]! {5 }8 y% E& D3 T      System.err.println("Exception updateLattice: " + e.getMessage ());
* p8 \/ S! E9 F- b9 w; ^& o- C1 t    }# X" {. _" F, m0 I) T
        # M6 L$ c7 O1 `) D' x& E4 E0 s! J
    // Then we create a schedule that executes the" h  Q* T! @2 c$ [( w
    // modelActions. modelActions is an ActionGroup, by itself it
% ]9 h: _! @' e+ h    // has no notion of time. In order to have it executed in, Q" D. O, e4 v, N4 n
    // time, we create a Schedule that says to use the( R; e7 A& Y1 o  ]
    // modelActions ActionGroup at particular times.  This
3 j3 J) K1 v/ z# ?- I& U# P    // schedule has a repeat interval of 1, it will loop every
/ u- \# l0 n9 o+ ]* ~    // time step.  The action is executed at time 0 relative to
6 ~8 L! `/ ~+ D# |8 c    // the beginning of the loop.
! c) @6 ^. _+ q" P3 `$ i0 W) I$ i+ n+ u5 A7 \% j
    // This is a simple schedule, with only one action that is3 b% V0 T6 ~3 q
    // just repeated every time. See jmousetrap for more- o+ t8 a: i: v/ m
    // complicated schedules.
9 m9 Q8 @+ ^( O. Q5 T  j8 b" J  ! M. ^* A! k5 D$ \5 t9 _! R- w
    modelSchedule = new ScheduleImpl (getZone (), 1);  t) C& t/ Y1 i
    modelSchedule.at$createAction (0, modelActions);' o5 {7 U3 h2 i2 H7 \6 T* c) c. T
        
& h6 P! F& Q6 F5 \. z1 U# N    return this;3 Z% ~6 _$ M; ~) x) h
  }
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