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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:: t$ U3 k" W! G( q
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public Object buildActions () {: ?( F! ~- m5 |0 N3 i' W
    super.buildActions();
& F' y+ J. O0 g; e6 g; f* y    2 V5 w- M( U) i0 U4 f& W3 S
    // Create the list of simulation actions. We put these in
8 Y  y- z* O& X% R0 A4 W  y    // an action group, because we want these actions to be) m8 S, f. G+ J
    // executed in a specific order, but these steps should
2 i! Z) c7 e2 W$ Y$ q    // take no (simulated) time. The M(foo) means "The message  W- W5 c  [! H. o! W
    // called <foo>". You can send a message To a particular
6 L2 D7 }; A; w5 \    // object, or ForEach object in a collection.
* w5 g5 X9 C9 c6 H# H        
! b: `2 H7 f6 A; K  |    // Note we update the heatspace in two phases: first run- k* X' I* _* W( s) T9 c" k7 Q
    // diffusion, then run "updateWorld" to actually enact the
" ^% C8 `" S/ u' Y+ L    // changes the heatbugs have made. The ordering here is. p2 x8 H$ F: B, O- }
    // significant!6 F4 H- ?$ y4 O* \
        : d6 E. I# `2 I2 ^0 V& W  u8 j
    // Note also, that with the additional
- @) w& y3 W# [* h    // `randomizeHeatbugUpdateOrder' Boolean flag we can! W: T% P! S  J% P8 q) p/ T
    // randomize the order in which the bugs actually run
3 V( Q, y2 r$ A4 J    // their step rule.  This has the effect of removing any
& ^' F4 X( U0 h; g# R- I7 H! p    // systematic bias in the iteration throught the heatbug
8 Y0 _# x; J3 q* m* k    // list from timestep to timestep1 W' I; @$ D; X1 Q1 I
        * I2 f. p* O  q+ s! e1 |
    // By default, all `createActionForEach' modelActions have7 d! x/ `4 y1 J/ n; J& O  ~
    // a default order of `Sequential', which means that the% i' q( O6 q% |
    // order of iteration through the `heatbugList' will be1 t: M- |  {$ D5 G* }
    // identical (assuming the list order is not changed8 u( W* T2 M5 P7 x+ x6 w/ X
    // indirectly by some other process).
+ I4 f, ]" q: n2 l; t/ r1 b9 m   
- K4 r. a% x6 I. P) Y: o    modelActions = new ActionGroupImpl (getZone ());
& u( G- {) g' _2 ]
$ v# l0 T) k7 b+ L" E! V. q    try {
3 a; U1 B, T. b! l3 U3 a% R$ r5 O      modelActions.createActionTo$message- A- `2 j, H6 ^, g2 I* \
        (heat, new Selector (heat.getClass (), "stepRule", false));6 v/ F8 K: K* ~& B3 v# L7 H& i/ A
    } catch (Exception e) {: _# J! M* g" F3 ^: o& \5 x
      System.err.println ("Exception stepRule: " + e.getMessage ());6 D2 h; U, h& ]' c% x6 F- `
    }
9 w) @1 i) a* @9 w9 v% J' |9 U1 O: x) r
    try {
6 D! _! c' z$ L- S+ g! }2 i      Heatbug proto = (Heatbug) heatbugList.get (0);8 M3 Y3 G( D( V) w
      Selector sel = $ y5 `! j$ h7 a2 w7 u: ^: ~
        new Selector (proto.getClass (), "heatbugStep", false);
. t! H, x6 ~1 h' Y. n1 K      actionForEach =
# T$ U; a  [% {9 T( W/ p/ K        modelActions.createFActionForEachHomogeneous$call
+ o- R' A3 U6 V& W        (heatbugList,& \+ D8 k5 w* E% \; A/ Y+ I5 k& T
         new FCallImpl (this, proto, sel,
( C# E( S/ s3 b8 a; M, f( z                        new FArgumentsImpl (this, sel)));/ M7 A2 t* x( W6 l5 s" g. O5 c
    } catch (Exception e) {8 u1 L9 b2 \! S: O" B$ s
      e.printStackTrace (System.err);( m6 n% v0 [5 {& V  X
    }
7 x1 f/ V9 i7 o: T, s   
' M7 b" W/ M$ A3 S" W' i, P2 C    syncUpdateOrder ();- c# R/ m  j- E2 P+ H1 {0 X

+ j) i0 @0 w  H    try {
- p$ s5 _) |  K# _1 s      modelActions.createActionTo$message
- B" h4 Y- v- `+ f8 Y$ `8 k        (heat, new Selector (heat.getClass (), "updateLattice", false));1 V# P1 n0 p. T  n/ q5 V
    } catch (Exception e) {
* f$ f7 Y6 o6 \/ B1 d- O2 o8 C      System.err.println("Exception updateLattice: " + e.getMessage ());+ k7 g/ s) ]6 {$ f7 Q9 G
    }
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( m% m% y4 }3 Y; _    // Then we create a schedule that executes the
, }% y  P7 P" r    // modelActions. modelActions is an ActionGroup, by itself it# o% q/ k% I! Z# K! L, O! @
    // has no notion of time. In order to have it executed in1 l& y! S! T0 _: R" T. {
    // time, we create a Schedule that says to use the
0 G, c' J& h/ }1 B    // modelActions ActionGroup at particular times.  This
5 }' L: H; ~; R. ]6 }+ V, Z    // schedule has a repeat interval of 1, it will loop every
3 e' W* I6 J& u' ~" ?, h! i    // time step.  The action is executed at time 0 relative to6 A" \8 e; H( w5 U6 H
    // the beginning of the loop.. d! j4 J! t4 ~& K. e9 f0 v
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    // This is a simple schedule, with only one action that is
8 B+ q- n2 C" Y    // just repeated every time. See jmousetrap for more
3 l+ ?: G' O5 k    // complicated schedules.
$ g( M, u, q7 b- Q% c  + n4 s1 x: f+ A1 k3 |, P" h
    modelSchedule = new ScheduleImpl (getZone (), 1);
4 F; V% v5 }- p    modelSchedule.at$createAction (0, modelActions);3 U( ^% R4 a& w# k0 F" d
        
7 r8 X2 X4 h, m2 l1 Q8 m8 r    return this;+ X* f4 c$ e4 s  x
  }
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