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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:
% V  r: l0 v9 S, l  _* v5 r5 @( s; L3 q
public Object buildActions () {
6 A: ~0 a- S* ]" N# r3 R0 i    super.buildActions();. P! ^4 U, K% B% j
   
# x2 ~, S, D% i1 |: P    // Create the list of simulation actions. We put these in
" M" I( @* Q, _    // an action group, because we want these actions to be7 k3 Q- g. D1 Y$ M; Y, {: d' \
    // executed in a specific order, but these steps should: J8 N' G7 g8 F8 g+ J2 v: b( R( G9 b
    // take no (simulated) time. The M(foo) means "The message
1 J3 p" r; J. P$ A    // called <foo>". You can send a message To a particular
- B% l) ]. o  Q    // object, or ForEach object in a collection.4 T" }* G( h) w8 ]: a
        
  `( Y$ X! Q8 ]. N. `$ }    // Note we update the heatspace in two phases: first run) p# x1 k$ q6 N" E& M; \6 X
    // diffusion, then run "updateWorld" to actually enact the6 K9 @8 k  Z' v
    // changes the heatbugs have made. The ordering here is' w. k0 O* Y  Z0 z* ~; e7 R
    // significant!
6 H  E6 G  ]0 O- h1 ^- A        
$ a7 D) D, q8 P" n2 M, Y) }    // Note also, that with the additional: `9 z# m4 N/ ]# @! A; J' ]" j
    // `randomizeHeatbugUpdateOrder' Boolean flag we can# o0 g* t& ^) v3 |3 M
    // randomize the order in which the bugs actually run
- F0 U% ]# R6 h0 Z    // their step rule.  This has the effect of removing any
7 W* a: A% V7 @* ?8 o1 y) N3 Q    // systematic bias in the iteration throught the heatbug, R8 v. v+ i4 t: H+ }
    // list from timestep to timestep3 }# d/ m0 V( O, r1 v% K
        ! h4 V: Y- N1 K( v( b( l( @
    // By default, all `createActionForEach' modelActions have3 C$ x6 v& m) J7 _) L. C' K
    // a default order of `Sequential', which means that the4 P" K9 A& D; \0 D3 c
    // order of iteration through the `heatbugList' will be2 |' Z4 Y+ S# |+ c
    // identical (assuming the list order is not changed
4 [  V$ r/ {7 V: R1 P    // indirectly by some other process).) a1 C5 S4 u9 K$ `
   
' T. Y7 h8 k8 N: G0 U! N5 w) [    modelActions = new ActionGroupImpl (getZone ());. a$ D3 |" Y  C. I& D' n

% M5 q$ F# Y) |. |    try {
3 t5 Q" S7 M5 W5 T      modelActions.createActionTo$message
7 h& L$ Z! |; H' r4 W0 s        (heat, new Selector (heat.getClass (), "stepRule", false));
( b5 _6 M0 s$ n- K$ s& M    } catch (Exception e) {
6 q; K8 t. h4 e      System.err.println ("Exception stepRule: " + e.getMessage ());
+ N2 o& ~1 Y6 F8 J    }
+ i7 w) y# R: M' L
- E7 E! k+ ~, `    try {- ?+ H1 o) z. B4 ~5 A
      Heatbug proto = (Heatbug) heatbugList.get (0);
1 k0 g' s: L0 ?/ O+ D      Selector sel =
7 i0 U& f4 g5 a        new Selector (proto.getClass (), "heatbugStep", false);' j& q+ w. {/ s
      actionForEach =4 B9 t  O8 {% G
        modelActions.createFActionForEachHomogeneous$call% D8 v( V; D" \8 ^+ W8 q7 I$ u
        (heatbugList,, N% Z- k* ?. t* \7 j& Y
         new FCallImpl (this, proto, sel,8 b- f% K: y8 n" ?  B% W
                        new FArgumentsImpl (this, sel)));
" C6 W* V: v; g% W    } catch (Exception e) {0 a1 j: a6 J& S# p9 d. K& [& C
      e.printStackTrace (System.err);
! f, ^, O+ j5 y+ ^7 V7 u    }2 `$ y* H% x3 S9 ?) R8 D
    7 _- J% {. T3 S( U5 D# c% d
    syncUpdateOrder ();, e+ r/ B& Y7 A8 S7 ]6 J
2 b. ~  a0 {0 h5 P
    try {
/ J# p2 r$ s, G/ o6 w' u& W2 C- g      modelActions.createActionTo$message
. E2 l; H: n2 U3 w        (heat, new Selector (heat.getClass (), "updateLattice", false));' ^+ y0 r, o4 A' P( E
    } catch (Exception e) {% ~( ]1 I5 ?$ P' ^% \( e
      System.err.println("Exception updateLattice: " + e.getMessage ());
8 P' \3 p$ z% j; V9 I+ D    }- u1 V+ J, V, E% J4 n! x
        9 V  g' B& M4 k4 }" H- o- u. l; S
    // Then we create a schedule that executes the2 f$ J& f% s3 w0 N: ^5 \
    // modelActions. modelActions is an ActionGroup, by itself it
4 i  u1 V1 n6 H, G7 y: n/ R    // has no notion of time. In order to have it executed in9 _% R/ `' H, k. j, j
    // time, we create a Schedule that says to use the
* i( I1 [9 A3 y+ {: k( L    // modelActions ActionGroup at particular times.  This
8 J+ o: W( c# G1 T1 k  J$ T3 K& G    // schedule has a repeat interval of 1, it will loop every+ y! h9 g* T5 `' J1 o
    // time step.  The action is executed at time 0 relative to
* D* R2 {1 }0 [2 S5 y# R    // the beginning of the loop.
$ b. Q2 ?. T$ O: Q8 Q; M6 l
" |& _, y( }2 {1 i/ q& A; t    // This is a simple schedule, with only one action that is
/ w- [6 ~9 ~1 j( h3 J1 Z    // just repeated every time. See jmousetrap for more* A7 z0 o5 Z* [. I
    // complicated schedules.! @% f- I8 _6 A( j) j* I6 v9 y
  ' s2 z% q/ J' H8 o; D) c
    modelSchedule = new ScheduleImpl (getZone (), 1);
6 Z1 i4 G# K$ A8 C* {) X    modelSchedule.at$createAction (0, modelActions);- F$ U& n4 w3 i$ R1 o: }
        0 a  Q0 T, k0 _/ O- s0 W
    return this;, j* F- F$ J" b/ C1 w* z  U4 m. |
  }
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