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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:
1 E* @9 q* M. E  {
5 R+ ~4 H& H2 E- p9 Z/ T; F public Object buildActions () {
7 z: b% I" T* {* v6 X" w    super.buildActions();* }( Z2 Q- y* H% y/ j) m" q
    " ?+ Q# |* m: g% ]9 p: f
    // Create the list of simulation actions. We put these in: d! T/ A2 {  {6 I6 m' K
    // an action group, because we want these actions to be, S, I! m9 V9 q
    // executed in a specific order, but these steps should0 y: B" Z# y  \+ }7 k0 s+ ]) @" z
    // take no (simulated) time. The M(foo) means "The message) s/ R8 \* R, Y2 L, Z& U0 a. l
    // called <foo>". You can send a message To a particular" p2 |' @, A: ^8 N% Z
    // object, or ForEach object in a collection.% }2 n. i, _( D3 U# @
        1 V! ~; @- K! D* P8 d' D6 G/ N
    // Note we update the heatspace in two phases: first run
8 `1 h+ A0 H6 j    // diffusion, then run "updateWorld" to actually enact the6 o$ C3 u! k" G& J# g% B
    // changes the heatbugs have made. The ordering here is" b6 [" c; P6 v+ r& R! A
    // significant!% C0 w; p$ {! G2 a5 c& J1 U4 q
        3 E8 B. i& p+ a+ v+ ^) z
    // Note also, that with the additional0 p* n4 y) t  |# @
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
) `9 G7 ]; n; W    // randomize the order in which the bugs actually run
3 X. f# Q2 x( }: m    // their step rule.  This has the effect of removing any2 r- Z$ J; b: g. O% e/ ]! E9 S
    // systematic bias in the iteration throught the heatbug: N, c/ T, z8 h  S+ P
    // list from timestep to timestep
9 C4 Z5 C+ m' I( r) ~) z        ( J. }7 w0 ^( D) `- D$ e
    // By default, all `createActionForEach' modelActions have0 R1 |- u8 @7 Q+ p
    // a default order of `Sequential', which means that the
9 c" }/ G( |* j1 G$ b3 e- S) x5 ~    // order of iteration through the `heatbugList' will be
" l# ]. b& Y  A/ S$ ?  b! Z8 n2 X    // identical (assuming the list order is not changed: E# w" o, g( h1 s  b- x+ b
    // indirectly by some other process).
$ S6 @6 I+ V' C8 h/ o" F   
$ q/ h0 z" F1 X& K: u2 k' z$ B    modelActions = new ActionGroupImpl (getZone ());
4 `8 U  Q* m* ]4 ]6 v; k( l0 M  [. ?
    try {7 E: p6 |  `7 C/ _$ k  `/ Q: O/ j
      modelActions.createActionTo$message
; V3 v. t( ?+ o+ A! L        (heat, new Selector (heat.getClass (), "stepRule", false));0 j4 k: R. }: o- o; x
    } catch (Exception e) {2 }& T' B5 Y& q8 H, `+ Y* p
      System.err.println ("Exception stepRule: " + e.getMessage ());
8 I& e9 f+ Q/ F3 C5 [, f, ?( @    }
9 T2 C  p9 B4 K  j. Z4 M1 K: d9 M$ W4 d9 [: j; r5 V" @- w8 ~& l
    try {8 u' z% D, f& A+ c. w
      Heatbug proto = (Heatbug) heatbugList.get (0);
  d* ^- Z' d# R* `8 |# g      Selector sel =
  i3 R4 ?7 t3 B0 U, Z8 F        new Selector (proto.getClass (), "heatbugStep", false);
( i/ z' U8 F6 S      actionForEach =
, k# f; w% x+ e1 i' O6 L        modelActions.createFActionForEachHomogeneous$call
( G3 q: E4 O& S" _. S9 O' U        (heatbugList,2 I  o: K1 r+ Q0 `+ _5 ]' T
         new FCallImpl (this, proto, sel,3 a# \% c; p0 d( ^6 y1 Q: ~
                        new FArgumentsImpl (this, sel)));; t) g. u( Q6 u, |5 T6 v: u9 T
    } catch (Exception e) {" ?& q4 }% y; r$ C6 A/ m
      e.printStackTrace (System.err);* ^, K; j; U$ q, j7 E9 M
    }% r! Q# X4 h! S
    9 h4 r2 Z, G) H* f) @
    syncUpdateOrder ();! y4 A, d6 W% r) H3 \6 n
2 h' n  _2 I/ W/ H0 I$ ]7 U
    try {
* I; M  z! X: ]4 }& i* l/ R, p      modelActions.createActionTo$message # ^& p. Y( S* O! P0 _
        (heat, new Selector (heat.getClass (), "updateLattice", false));( }9 Z' j  x9 g. u, A
    } catch (Exception e) {- F( w! }' N( v% x
      System.err.println("Exception updateLattice: " + e.getMessage ());
( S0 y! n" i  w" f3 ^    }
! E; J! Z- ]9 H+ c; A; }, c        5 U, j7 F3 p, \& U
    // Then we create a schedule that executes the
5 s: X6 d, b- [, R1 q    // modelActions. modelActions is an ActionGroup, by itself it
" p# |/ C/ B9 z; K3 f    // has no notion of time. In order to have it executed in
  B0 w: i+ ~$ s- n7 F7 P    // time, we create a Schedule that says to use the2 b! r/ k' p: V5 y$ a! ?7 Q$ `
    // modelActions ActionGroup at particular times.  This( \5 k2 w! i; u
    // schedule has a repeat interval of 1, it will loop every
5 h2 y7 i* K6 ~9 u8 ^: Z    // time step.  The action is executed at time 0 relative to0 t/ F1 ~& l, k5 M$ h  `' u* F* r
    // the beginning of the loop., w9 f: @) S" q+ [* y

6 R) i' [- X6 m/ d0 b) T' ]0 O    // This is a simple schedule, with only one action that is. A4 x3 C* u9 M  R- ?$ {9 b
    // just repeated every time. See jmousetrap for more# J* y! t7 |! e' M7 {
    // complicated schedules.
% {1 S4 H; P* y! _0 D2 M  
4 v8 y5 j( l, H* p3 t    modelSchedule = new ScheduleImpl (getZone (), 1);% _* ]; Z1 L( R/ |  \
    modelSchedule.at$createAction (0, modelActions);# U9 m* t* n6 i  W
        & N2 n0 n4 T5 f& g5 y' i
    return this;
+ f  _* y1 G6 V. A  }
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