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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:# \6 l9 n0 M# @

( s9 Y. W' `( h+ z$ d5 t( ` public Object buildActions () {, Y* N0 f8 d  X- Y- |. r6 b9 a
    super.buildActions();
$ s+ k+ c0 z, B# y    , ?, R7 s: k. E/ ^: X% W0 b* i: a- f
    // Create the list of simulation actions. We put these in! K7 ^5 [: p+ I
    // an action group, because we want these actions to be
( P, f/ F/ X8 X9 D. Q    // executed in a specific order, but these steps should7 g5 T  C- V0 Y0 q+ \& ^) M( u! t
    // take no (simulated) time. The M(foo) means "The message
; u9 a; y# c; a    // called <foo>". You can send a message To a particular
, C# A% z. l  B! U' Y" N    // object, or ForEach object in a collection.
) `& w# N- ^! t" b        
) z8 m' e; z8 y3 @    // Note we update the heatspace in two phases: first run0 ~! I  r) Q2 q* W9 ?2 m
    // diffusion, then run "updateWorld" to actually enact the
; p- t% G9 w! ~" `. I    // changes the heatbugs have made. The ordering here is1 b5 c" x& |  b. }% @
    // significant!
: C1 |  _/ h$ P7 ]/ t        ; E5 }6 ^& ^* {, l
    // Note also, that with the additional( X6 t1 s0 t! i7 T  E4 ^; y
    // `randomizeHeatbugUpdateOrder' Boolean flag we can; j! ]) H: |' A- \
    // randomize the order in which the bugs actually run  _% x6 S7 h2 h' C9 |
    // their step rule.  This has the effect of removing any
+ b4 c0 W; C2 [$ T    // systematic bias in the iteration throught the heatbug2 O0 c; C: o1 N1 R
    // list from timestep to timestep5 `/ e8 N3 [( Y4 F* E% A
        
( H4 u1 L  b. Y( l5 m6 q4 ^7 }. x4 u    // By default, all `createActionForEach' modelActions have
6 s4 R" q! z7 I; w8 f    // a default order of `Sequential', which means that the, W+ o; p! c. J! j: B+ H
    // order of iteration through the `heatbugList' will be" f& A, z# ?( N4 W
    // identical (assuming the list order is not changed6 i/ z& F& W- K& X0 a2 m; [
    // indirectly by some other process).9 B, @5 E1 D, e7 S8 O: b
   
- P% n  Z7 T- R- H  z4 j    modelActions = new ActionGroupImpl (getZone ());/ |1 ]5 h$ Y" l" V3 @
6 @, Z  G% P6 H2 j1 \2 S
    try {
' e- D- u4 }# @      modelActions.createActionTo$message
) c3 y/ X/ Y  V; v        (heat, new Selector (heat.getClass (), "stepRule", false));$ J' @" |1 v2 V" a- B
    } catch (Exception e) {
  b2 A4 M  n) O7 Y      System.err.println ("Exception stepRule: " + e.getMessage ());
" d+ S% ?; j' g    }
8 F; O( h) ^1 ?6 N# ], C3 A- A3 P8 L& t/ G3 [8 J  ?; f
    try {
8 d. Y: B5 z$ R      Heatbug proto = (Heatbug) heatbugList.get (0);
  y/ o3 x6 c! G2 p6 w3 R1 }( h2 ^      Selector sel =
5 h0 }/ b6 ~8 d# }        new Selector (proto.getClass (), "heatbugStep", false);
* z; U* L+ Q7 x' m, j" b2 x" I      actionForEach =
* q5 A1 L8 O0 W0 @" u1 \* s! H1 ~        modelActions.createFActionForEachHomogeneous$call$ M4 A0 E' m5 I( \4 r% R  @
        (heatbugList,
+ O, Y1 Y: F7 z$ k( z1 E; f  Q         new FCallImpl (this, proto, sel,
6 E0 ^0 }- C2 l  V% P                        new FArgumentsImpl (this, sel)));
7 d/ i/ [+ A& v7 j/ F' K% n    } catch (Exception e) {
: ?, H( O, T* D* n/ e# L: [      e.printStackTrace (System.err);9 v1 f9 Q" o+ F; F; ^9 s9 L
    }
* `) |$ l3 F5 G9 _   
' t3 x+ ^0 B, z1 i! _( l7 `, n" Q+ _    syncUpdateOrder ();' Q8 {& ^$ X" Q' o& V% ^6 q( ~

( @4 V: N( u9 e7 m( _& F, }    try {
, K4 F+ d; ?( _, d* P+ L. h1 `; l      modelActions.createActionTo$message " O' {7 f' I$ ^: X- }1 p  s; P7 X5 r
        (heat, new Selector (heat.getClass (), "updateLattice", false));
" [3 K" N6 h+ ^3 S- |, U    } catch (Exception e) {
$ b8 c' A* O5 X8 V+ t" b( t: ~      System.err.println("Exception updateLattice: " + e.getMessage ());
) u/ p% c; i) |. M; W* g    }) k% \  X$ k4 u0 w# ~
        2 ]7 r6 O, y3 u9 `! Q
    // Then we create a schedule that executes the
3 K+ p( v, K2 p; L; M5 [- X, n    // modelActions. modelActions is an ActionGroup, by itself it
6 W+ y/ J- c5 c0 r4 e    // has no notion of time. In order to have it executed in
9 ^* Q7 P7 q% Z& w( _    // time, we create a Schedule that says to use the
, p. I7 W2 W# j+ O& ^$ x3 v    // modelActions ActionGroup at particular times.  This
, ^) U' \5 l3 I0 D, P    // schedule has a repeat interval of 1, it will loop every
0 R# k. ~/ q7 b9 }/ ?* K9 ?    // time step.  The action is executed at time 0 relative to
+ X8 v4 r3 b& m2 [5 c, v    // the beginning of the loop.
+ A- O. O: h7 g! F
* m* E6 g" L4 v5 R  \    // This is a simple schedule, with only one action that is' j& r, T5 u: z' ^2 }8 t6 @
    // just repeated every time. See jmousetrap for more- h+ @, v& {* U( ~3 g
    // complicated schedules.
: ]* Z" P! a, K  5 l) ], Q2 F: @8 a& k/ N
    modelSchedule = new ScheduleImpl (getZone (), 1);/ [" g2 I3 ?' K+ I( E6 q/ \% I+ Z
    modelSchedule.at$createAction (0, modelActions);% `5 A% ]9 z" P' G/ |$ X' p
        
# {! G5 J# K) e4 c' D2 i    return this;, H5 l" F5 f/ _% N4 a
  }
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