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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:
- \: t  j! e* T( k! U7 _$ k0 S
. J1 [  v2 {% |/ s9 M public Object buildActions () {
* s3 Q$ ]$ d6 Z5 A  v    super.buildActions();
3 M" e4 |2 ?  @+ D( G: s+ P    - ~, v9 A4 L& g7 g' [
    // Create the list of simulation actions. We put these in6 W' q' p; i- b  F& m. p# D' X2 M
    // an action group, because we want these actions to be
% ?: X3 K7 W8 c, C( r* \1 P    // executed in a specific order, but these steps should, S# S. i" @( X& q+ \$ R  T
    // take no (simulated) time. The M(foo) means "The message& ^2 _6 ~/ p5 ]' w' o
    // called <foo>". You can send a message To a particular
' r! F' i6 T# |3 f5 A' |4 C. I    // object, or ForEach object in a collection.
) i4 p1 [5 g8 c% ]. o        ' C; R7 U/ f/ ]) `3 c+ }6 O
    // Note we update the heatspace in two phases: first run
1 u: y: g* D) q    // diffusion, then run "updateWorld" to actually enact the
1 O) {$ a, b4 A) a    // changes the heatbugs have made. The ordering here is7 q. r% c2 j1 `( |
    // significant!9 t( [  `5 l( H& k
        
! L( [; ]9 L6 h6 g; ~    // Note also, that with the additional, `3 B- h- m; @$ a( L' V
    // `randomizeHeatbugUpdateOrder' Boolean flag we can" ]1 a$ i2 t2 |9 B  @- y
    // randomize the order in which the bugs actually run+ S0 p) R. G" Z8 Z
    // their step rule.  This has the effect of removing any
% N4 a. ~' W- S3 }( k" W! @    // systematic bias in the iteration throught the heatbug% C0 t% ]2 q) V# f
    // list from timestep to timestep
0 @5 B! _3 b& D1 B$ ^        
$ E  V  _0 p# O% o    // By default, all `createActionForEach' modelActions have
3 m/ m8 Y1 a/ {& E# x    // a default order of `Sequential', which means that the: n; F* R5 i+ e& l" ~6 N
    // order of iteration through the `heatbugList' will be4 z, g' _9 }" Y7 j
    // identical (assuming the list order is not changed
! s% f! i! M) w4 \/ |; _    // indirectly by some other process).. ]' L. m1 X8 s( z4 u' x1 @* Z
      [2 {( _( n( s' ^$ S
    modelActions = new ActionGroupImpl (getZone ());
$ q) Y7 g5 ^+ e" H
5 i2 h$ y$ d0 Q- w, r1 {    try {, S; u. [$ X0 W" a
      modelActions.createActionTo$message
* W6 q  ]3 B0 \, Q" L        (heat, new Selector (heat.getClass (), "stepRule", false));
# c/ K, S8 A5 h8 F& r: l5 x( u    } catch (Exception e) {
3 H3 b# |) a! }  Z/ g) [, K      System.err.println ("Exception stepRule: " + e.getMessage ());
1 ~# W- |) E4 M# ^( J. Y    }4 I% b9 X( C) X. J( w

% F+ g* Y( m4 t$ ]0 u    try {
4 X- Z2 L5 J# v* Y. w      Heatbug proto = (Heatbug) heatbugList.get (0);
+ w: R. l+ O) h) c      Selector sel =
) U$ h8 K+ ]& e$ k& `9 t        new Selector (proto.getClass (), "heatbugStep", false);* {/ J$ q7 z$ k& m+ k; J
      actionForEach =
! r  f4 w5 v7 e* f6 r0 k        modelActions.createFActionForEachHomogeneous$call
5 h; a2 p" ]8 @* G        (heatbugList,
2 M( f+ R% J; r( X* [3 T4 V$ t         new FCallImpl (this, proto, sel,
0 ]  I% H+ f! V. F+ C9 w                        new FArgumentsImpl (this, sel)));
: z8 C3 k+ `2 m    } catch (Exception e) {
. r$ T( [. T2 U. L( R5 |5 ]  l      e.printStackTrace (System.err);
! Z- L9 _. O' M7 g) R    }
9 q* t9 H8 u: u3 y/ i% v6 S   
5 W; y0 D& f! I8 i( A+ k7 C8 F8 {    syncUpdateOrder ();% H% c8 I* B' D2 [# e) v4 P

- a% n8 ^  X8 k9 N( ?    try {; M/ k2 t. e" H/ _3 y
      modelActions.createActionTo$message
6 ]7 E7 ?+ C, @$ w; d# o3 ^        (heat, new Selector (heat.getClass (), "updateLattice", false));$ S# J2 F, w- [1 @
    } catch (Exception e) {/ I7 ^+ s; ~+ k1 x% P3 r
      System.err.println("Exception updateLattice: " + e.getMessage ());4 N# _+ O9 i* i0 B9 b
    }
3 T9 N1 \% b! q5 B        
  M6 v1 O! ?/ E) j, b    // Then we create a schedule that executes the9 E/ u1 G, N3 Z7 o; H- f* M) B
    // modelActions. modelActions is an ActionGroup, by itself it# t) h; G: K  f) O# q
    // has no notion of time. In order to have it executed in
9 F/ G. S3 Q% W$ V' X  C6 s    // time, we create a Schedule that says to use the
" u& _$ d/ B/ X2 p/ w    // modelActions ActionGroup at particular times.  This
6 C( ^% \. H- O; |4 Q" ^    // schedule has a repeat interval of 1, it will loop every
. x, q( m/ O: b" w0 f( n" g( `4 V    // time step.  The action is executed at time 0 relative to; ]6 n* q/ E, {+ d
    // the beginning of the loop.+ x9 p: M2 e8 T/ R* P' W7 N$ C5 K

# t( m! u6 Z! j- E: B/ X0 b    // This is a simple schedule, with only one action that is0 f; Z! k8 H( y
    // just repeated every time. See jmousetrap for more
' W; T  f8 e# C+ o4 ~) q    // complicated schedules.
; T' I% j6 ?5 l" u: q  
1 ~1 J" D( R; E. K7 \6 j1 t    modelSchedule = new ScheduleImpl (getZone (), 1);* h' a5 N, n8 v4 `9 i+ B
    modelSchedule.at$createAction (0, modelActions);& c/ m& I: ^( p% d3 M3 E! U
        
: f1 i( a8 x. x$ F9 Q' y. h* z( N    return this;  p, t/ }# P: }5 K) l, U
  }
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