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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:4 ?  G& W1 m0 }9 V, g' b1 Y3 j
) a0 t' |) y# m6 F% ]1 S+ ?# t
public Object buildActions () {
+ m, Z/ T' q# E* V. j    super.buildActions();
3 v1 X+ t( e( d, W4 M    3 v+ m4 L- O% }# u$ V. s1 H
    // Create the list of simulation actions. We put these in+ L) j) n; Q6 Q
    // an action group, because we want these actions to be
# G4 s6 T5 \, I+ x8 u    // executed in a specific order, but these steps should
9 A8 W$ r$ l4 Q5 h    // take no (simulated) time. The M(foo) means "The message0 M4 q1 `: e/ v+ I
    // called <foo>". You can send a message To a particular! ^& t6 z# v7 r  R- ]
    // object, or ForEach object in a collection.- q9 e6 t8 S4 D# y: i$ R5 _& N
        
! W# M" y* u& \7 k5 O) I2 X# K    // Note we update the heatspace in two phases: first run
8 b2 p' I% K3 F* J0 r  G2 T: |    // diffusion, then run "updateWorld" to actually enact the  q+ b* P# ^# E% `
    // changes the heatbugs have made. The ordering here is) ^) D. L9 ~7 ?  H& R# b4 I+ w# y0 W
    // significant!
* N. N. p  a, u8 U2 @& T; {, b        1 j1 \+ m6 l" D1 S2 A
    // Note also, that with the additional& p8 y0 g# f0 [1 f- N+ I
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
1 I2 M; H, f: i1 j$ ^! t; B" a    // randomize the order in which the bugs actually run
1 T/ A2 S) B, V! A: F    // their step rule.  This has the effect of removing any# m8 _  ~% b4 B' A3 n  a  x
    // systematic bias in the iteration throught the heatbug
, L# j' Y" E1 }; N: C    // list from timestep to timestep0 O9 J6 h( ~- S
        9 c' i+ D# V, A8 W% O# u( R) s
    // By default, all `createActionForEach' modelActions have
. [- K& k+ R  U0 j( h9 x2 U: y    // a default order of `Sequential', which means that the% T$ f7 X$ N. `# a
    // order of iteration through the `heatbugList' will be
) L' ]) F/ m" |0 T, I    // identical (assuming the list order is not changed$ M9 ^4 Q. \8 ?! C, w; r# }
    // indirectly by some other process)., _+ K; Z$ |9 Z! D  c) k8 W
    1 c; A& N& @4 W) H
    modelActions = new ActionGroupImpl (getZone ());
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! X, q" U$ e8 K# ]( v+ M( k    try {& u3 G1 p. f  X7 ~# F# U' z! Q8 s! I' Z
      modelActions.createActionTo$message
, b$ M7 i1 T! m/ w  ?: k        (heat, new Selector (heat.getClass (), "stepRule", false));
: e3 Z% n. l3 W% [/ x. q# \    } catch (Exception e) {" x  s7 V! S; A( g$ [) {# u
      System.err.println ("Exception stepRule: " + e.getMessage ());
( g. M) V0 F. i$ g% R, @& B. A    }) x4 q! Z1 @1 a: i$ A6 ?: [3 f2 `
! _, |& A) h9 p
    try {
. p3 x* a1 N) B% j- c6 _9 \4 h+ g      Heatbug proto = (Heatbug) heatbugList.get (0);
5 Q% f5 i, {" D2 l8 [" ^) k  Z( T5 y      Selector sel = ) [+ D4 p  {; z. d/ |
        new Selector (proto.getClass (), "heatbugStep", false);
. o* e2 s7 \" @- n4 K7 P      actionForEach =$ a  t1 H& k6 U
        modelActions.createFActionForEachHomogeneous$call( l2 w4 z" R+ g  P! R  Y4 j
        (heatbugList,1 `! h1 G8 {( w' ]9 C
         new FCallImpl (this, proto, sel,0 W1 V* O+ @6 I* h
                        new FArgumentsImpl (this, sel)));
% ~5 O+ I- y% Z    } catch (Exception e) {
! M0 g% }, b- J+ J3 a; U" U      e.printStackTrace (System.err);
$ o3 e. L: ~4 b  F6 L( ?& S    }- s& e, e8 ]: r( c4 S
    $ x. O; D! U, L1 O8 s# n
    syncUpdateOrder ();$ @" |- H- B( ?+ _
9 ]% x$ }- w, B/ @) ?
    try {
) l  Q' _  T" X! a      modelActions.createActionTo$message
$ \3 F; H- j' {4 O: G# j* Y0 O        (heat, new Selector (heat.getClass (), "updateLattice", false));# g( H& I- [) M
    } catch (Exception e) {/ \1 N+ ^' x. _& R* R) h0 T
      System.err.println("Exception updateLattice: " + e.getMessage ());+ R! k5 o6 z9 L5 z; |$ _
    }
1 U6 y: r  @' J/ Z# }        
, P; `) d7 v! }# }    // Then we create a schedule that executes the$ y0 Z% h& I. V' ]- X: G+ F
    // modelActions. modelActions is an ActionGroup, by itself it
- d+ n9 N& X8 ~& _( [# V1 U    // has no notion of time. In order to have it executed in: }  P6 O& m- X* z
    // time, we create a Schedule that says to use the
* P# G) p) k* \( M8 X: w; M, B    // modelActions ActionGroup at particular times.  This
+ V6 J2 Y1 U! i, i% A  B    // schedule has a repeat interval of 1, it will loop every
" ]8 {! K7 b( _9 {  [% Y: m    // time step.  The action is executed at time 0 relative to$ d0 K5 [. V# k5 Q6 F% ~
    // the beginning of the loop.. @% o, P" N% A% }9 @2 y4 n

1 a7 H/ ]6 {# n2 t3 P+ ^8 y6 o5 ~! d    // This is a simple schedule, with only one action that is6 X4 `: U$ l) E8 W4 e
    // just repeated every time. See jmousetrap for more
* w$ \" d! B$ I. u0 Z  A, J0 M8 O& `    // complicated schedules.
% b5 C3 X- Z4 y8 S9 P  ) c! }! D$ u% Q. L% T. c6 P" T
    modelSchedule = new ScheduleImpl (getZone (), 1);
- D/ u0 U' y2 @/ ^5 V7 h    modelSchedule.at$createAction (0, modelActions);+ X6 w3 N, |$ S* J/ ^
        7 Y. B# _& H" O. h. i1 K
    return this;/ X* I. {2 N: `: @# F* c
  }
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