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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:% D- n9 f* e! v  }6 @

' n& K" ?. k+ c0 k. c7 q public Object buildActions () {
5 |+ w! G  E, n    super.buildActions();/ i. c, Y4 L. y: {
   
  _% e4 x& ^" ?9 q1 q    // Create the list of simulation actions. We put these in
0 {+ ^/ d- O4 t  ^  Q: ?: c    // an action group, because we want these actions to be" ]5 c4 s1 U; e" c0 P  a5 \8 K
    // executed in a specific order, but these steps should
# L  b* A+ L# U4 w$ K3 O    // take no (simulated) time. The M(foo) means "The message7 X9 z+ N* n7 ~: U6 D  G. e' {
    // called <foo>". You can send a message To a particular
* G7 A4 q! m7 ~4 H( z    // object, or ForEach object in a collection.6 W7 R7 a+ [, N& m1 e
        
4 r, n; T3 T- ^, w0 `    // Note we update the heatspace in two phases: first run
# ?  c  f# k3 `- \7 J) m' c( p    // diffusion, then run "updateWorld" to actually enact the; N( z+ l  ^2 d- u4 ]
    // changes the heatbugs have made. The ordering here is
6 }# ^5 v* j4 A7 }: M    // significant!
1 J5 J+ b' R6 A; N        : \- a, a- k9 C# c( J
    // Note also, that with the additional
( M- x5 K9 R4 I9 X8 [, L) ~8 ?0 _0 W: e    // `randomizeHeatbugUpdateOrder' Boolean flag we can1 |' X& s  j# N. ^9 F8 O, ]0 _1 K" u
    // randomize the order in which the bugs actually run, L* V. @9 a6 [
    // their step rule.  This has the effect of removing any
9 A9 V# {, d6 U# w& Z/ }) K% ~! G    // systematic bias in the iteration throught the heatbug  F1 g/ t6 J4 [$ Y9 n8 w$ ]# e  ]" M3 ?
    // list from timestep to timestep
" l3 h' L. {0 S  u1 X% P        1 w9 \4 O2 V2 Q6 D2 x( g: k0 t
    // By default, all `createActionForEach' modelActions have: f$ J& S  C) Q: c( ?4 h
    // a default order of `Sequential', which means that the
; e. L' V) z8 o$ E* _  S    // order of iteration through the `heatbugList' will be
9 E8 ~6 T9 Q* a    // identical (assuming the list order is not changed, }) s4 f! |* D
    // indirectly by some other process).8 Y- W$ E2 i4 b5 A4 p
    $ f0 P% S! E: K, x" ^0 q
    modelActions = new ActionGroupImpl (getZone ());
' [; l/ m4 ?( E# s1 `0 D6 A2 H2 c
. S) W" O- P0 R. I0 E. s6 T- Q, l    try {3 t  A2 }7 o' ^3 `
      modelActions.createActionTo$message
3 X6 k; u0 v0 o7 m/ J( e3 \7 i. u, t        (heat, new Selector (heat.getClass (), "stepRule", false));* O9 X2 `  o# X# @* V7 c- s, \
    } catch (Exception e) {8 ~( a, Z5 ?2 L* H$ s1 H4 N
      System.err.println ("Exception stepRule: " + e.getMessage ());7 S$ a. M* m; j4 g* E1 T
    }
1 @0 v0 q& b7 [6 ]& j4 Y) k( ^7 A# _5 g- i! O
    try {: \- T: _6 i0 H- @( l. W0 C
      Heatbug proto = (Heatbug) heatbugList.get (0);
" W% Q+ Q6 }$ l+ E& }% c      Selector sel = 2 x& q7 |& D! O( J7 t( F( J* x
        new Selector (proto.getClass (), "heatbugStep", false);
* J" e1 E9 W0 w0 h) W      actionForEach =
, j# f# D$ q: ^! `( W        modelActions.createFActionForEachHomogeneous$call2 ?; p$ Z' i! ?' N: W
        (heatbugList,
8 r4 c2 J) r. t- E         new FCallImpl (this, proto, sel,
2 B/ U1 h3 e  g: V" n9 P* Q0 }  l                        new FArgumentsImpl (this, sel)));  |+ x8 Z( C  f; F* _: i& h7 H0 e8 C
    } catch (Exception e) {
+ s! \/ R; t# \9 X1 Y1 E; b/ E      e.printStackTrace (System.err);! A( c; O/ q/ q( r) U6 g+ ^
    }
# q% f& E' `! q    # o# F8 Q9 X" d, d8 ~
    syncUpdateOrder ();
. L5 X' s5 n. `  L7 A( I% m4 _; B  [' O5 C( K
    try {
5 W0 k0 R) Z9 u      modelActions.createActionTo$message
6 ^5 E. E* O4 _$ v        (heat, new Selector (heat.getClass (), "updateLattice", false));
" N! t0 q: F% t. `+ x) U    } catch (Exception e) {
! q+ i7 |1 I% {+ d      System.err.println("Exception updateLattice: " + e.getMessage ());
" {) j( z0 Z- ^% X2 n    }
6 N& i6 a: a( Q  i5 G) I. f  y        * E% u! ~  ^; e9 ^3 U2 V
    // Then we create a schedule that executes the( k( b$ Z8 N. z% I9 L, I
    // modelActions. modelActions is an ActionGroup, by itself it7 D# v2 D  Y- j; U7 F/ k
    // has no notion of time. In order to have it executed in; X5 k: ^  T- N2 A8 i
    // time, we create a Schedule that says to use the) H# B9 W! C. {3 A. P9 t2 w( W  ?( K/ {
    // modelActions ActionGroup at particular times.  This; i. [' \. a, o6 I' n* y+ k
    // schedule has a repeat interval of 1, it will loop every
. X; W: c7 U4 P, L4 z    // time step.  The action is executed at time 0 relative to' k' D+ w# H1 ?  ^8 u: s8 o
    // the beginning of the loop.5 A. g+ y' ]& E) H5 g

' M3 K, w) k9 a; N8 T+ _1 D1 L5 C    // This is a simple schedule, with only one action that is& {* |3 f5 R9 k
    // just repeated every time. See jmousetrap for more
- z5 K. Z( ?2 t* Y% |    // complicated schedules.1 W8 y9 R+ c  Z# Q! @2 A" K  d
  
- S! t& G+ K$ b' `9 T    modelSchedule = new ScheduleImpl (getZone (), 1);) D; ^4 ?# E5 m2 u5 [, S  r
    modelSchedule.at$createAction (0, modelActions);
, T9 w$ ^& o" e7 U        7 }6 r* c/ Z$ x- E: H$ @
    return this;0 F9 Q3 p0 I1 ~& I( {. {
  }
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