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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:2 f7 `" {3 V0 v6 |5 q& e* F$ {7 d) [( d

$ j( x( G. s9 H9 E! b public Object buildActions () {, `' _" i' _( h
    super.buildActions();3 N& ?/ _1 t0 U9 o8 Y
    / i: p7 k$ r7 r$ y% Q
    // Create the list of simulation actions. We put these in, O6 A; d/ i, R+ J
    // an action group, because we want these actions to be1 F4 {6 t5 s1 D( N4 \: ?" D
    // executed in a specific order, but these steps should( [; c% Y4 {9 q8 K% r' i
    // take no (simulated) time. The M(foo) means "The message5 [( G) a4 i4 U5 l0 S, J$ R: ~2 N- o
    // called <foo>". You can send a message To a particular
% R( W9 u: S: q    // object, or ForEach object in a collection.
+ z% c' c+ ^' f; v        " l  D: [) r, t) f' Z; ~* n) ~
    // Note we update the heatspace in two phases: first run
! k, D; ^8 w9 R2 A( v. f" ^4 W    // diffusion, then run "updateWorld" to actually enact the
% K' ]0 v: d' n# W, A( P5 S' ~    // changes the heatbugs have made. The ordering here is8 k/ p" {& g* c
    // significant!! S7 u$ O7 I  A
        
+ r  ?- e, {) E: q    // Note also, that with the additional7 Q8 m2 }! \& m
    // `randomizeHeatbugUpdateOrder' Boolean flag we can! F/ J+ N' V5 l/ f7 x! r
    // randomize the order in which the bugs actually run1 D  m9 k/ ~6 p0 m7 M9 F
    // their step rule.  This has the effect of removing any
: l1 X' `9 ^: I) l6 g    // systematic bias in the iteration throught the heatbug
7 g! E  Z& y' h6 d6 P    // list from timestep to timestep- f  X2 L# T7 e0 L* Z* R
        4 [! G' W, H, O1 k$ p; u# m
    // By default, all `createActionForEach' modelActions have9 @5 n. V4 C$ {( y4 H# s
    // a default order of `Sequential', which means that the" z5 U) S/ K8 [* R
    // order of iteration through the `heatbugList' will be
  h+ [7 W8 y, U5 j5 G" X+ B    // identical (assuming the list order is not changed  U0 x( u1 w# `! f- m8 s5 Z
    // indirectly by some other process).  L7 w! G7 q4 }8 T2 d4 U) Z
   
% i. @2 J2 u7 _9 y' ~    modelActions = new ActionGroupImpl (getZone ());$ Z# x+ [3 `% e  r

2 A/ h9 @& j& @, Z, {/ }8 \" K    try {
$ a( T+ u3 }4 M- n9 o      modelActions.createActionTo$message
4 x) m1 ^* ^7 Z8 A        (heat, new Selector (heat.getClass (), "stepRule", false));1 I/ S0 t& Q. s/ [* b6 ~& }4 A3 a
    } catch (Exception e) {( }, Y! K: I- R+ m. i; ^
      System.err.println ("Exception stepRule: " + e.getMessage ());2 M) l: X; C9 T$ C
    }+ {3 Z9 ~, _' X, e

3 t7 Z. O6 v# ?$ g7 L    try {
8 O0 j& {2 N5 g& E# t% {/ F      Heatbug proto = (Heatbug) heatbugList.get (0);) `; u7 {1 \* A9 X* q
      Selector sel = + v. y( T* |& Z7 ]7 Y
        new Selector (proto.getClass (), "heatbugStep", false);
' e% m; p5 f' @/ W1 {      actionForEach =: G5 r# _: \% U
        modelActions.createFActionForEachHomogeneous$call( D( j- i0 ?( \' v
        (heatbugList,1 c! Y, W+ }; ]7 S7 ~4 ?/ V( }
         new FCallImpl (this, proto, sel,
* K" w! y3 Z. q% O0 w                        new FArgumentsImpl (this, sel)));
8 u5 t1 }( o" U- N9 A) @    } catch (Exception e) {
! J4 r/ `% _: }: `( }* t      e.printStackTrace (System.err);
' Y- J3 u( m4 b) }* f/ T+ B    }0 [/ {( z( q/ Z  z; t/ o' P1 G* Q
    / J! d) T+ F' I8 n7 S
    syncUpdateOrder ();
- {! N& I" a+ T
$ w4 {/ z4 Q2 L( ]    try {
9 W0 T( s- G" [! B' U4 t+ H4 w      modelActions.createActionTo$message . @) `8 D% q0 s! C# a& H
        (heat, new Selector (heat.getClass (), "updateLattice", false));; A$ w0 T+ {' l
    } catch (Exception e) {
* R4 c. b! j, z! S0 R: B      System.err.println("Exception updateLattice: " + e.getMessage ());% D2 }) q/ Z  _5 l0 T
    }
- M( j7 Y+ c1 ^# t" `; I4 c; I1 @        
( z* H9 z+ r' A7 ^4 ^    // Then we create a schedule that executes the! }( V. c( B5 [& k7 H+ m3 Y- f
    // modelActions. modelActions is an ActionGroup, by itself it& h, |; |  ?; M2 i* P
    // has no notion of time. In order to have it executed in
! b- N. l; _0 B! F6 Q    // time, we create a Schedule that says to use the6 k9 ^% \/ X; `8 C2 e
    // modelActions ActionGroup at particular times.  This
8 a& v( E# f3 n0 D& D    // schedule has a repeat interval of 1, it will loop every
% g  X  a: ~+ ?0 }. b3 i  L- s    // time step.  The action is executed at time 0 relative to
8 [8 M2 S. j* J( @- ^: L  a: T) {    // the beginning of the loop.
; x0 ~4 M3 p, K# |! m
, j$ I0 C! j2 @+ a5 B  a$ P3 s- D1 O& e    // This is a simple schedule, with only one action that is2 k9 o4 J1 X, F, Y! [0 N
    // just repeated every time. See jmousetrap for more9 n/ T, T. G% }# m, l
    // complicated schedules.8 C* v; Y/ Q1 F5 |
  + V1 h! U9 G8 o4 [8 ~& c1 m( ?7 Z
    modelSchedule = new ScheduleImpl (getZone (), 1);  ]/ ]" |/ j7 z" q
    modelSchedule.at$createAction (0, modelActions);3 m- Z- H* X( R. J
        
9 S8 s- O) H+ `( U, l1 C    return this;
2 J3 @0 W8 p- P' L  }
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