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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 r$ g% I! b' [6 z- x
7 W0 r5 A* v& G; ^$ A public Object buildActions () {
6 K+ b$ S. e$ ~9 K& o8 Q& G7 x    super.buildActions();
  z+ R: V  s) i% F   
, g8 ^$ P8 M; s$ i1 e    // Create the list of simulation actions. We put these in7 J+ h% y( a# L
    // an action group, because we want these actions to be
$ V8 A9 O, k% `& {" a2 ?% K+ [" B% ?    // executed in a specific order, but these steps should/ `( ~7 M/ x6 |
    // take no (simulated) time. The M(foo) means "The message
9 V0 N/ b/ V: ~, G3 l    // called <foo>". You can send a message To a particular$ Y! ?- Y, `$ l( Z4 O, W$ {
    // object, or ForEach object in a collection.! e9 }9 n3 D8 c9 |
        ( B5 E% J& u9 P; m4 N, U2 b
    // Note we update the heatspace in two phases: first run
1 P. _$ p+ G% B+ z6 i  Z    // diffusion, then run "updateWorld" to actually enact the
0 Q5 A% ^8 t: I    // changes the heatbugs have made. The ordering here is
8 e; {( o3 G" _+ }    // significant!
' P7 x) x3 k( }' T) s  ^3 J        
) G/ q2 _' _2 J# q3 ]/ M' F    // Note also, that with the additional
) e" j% F/ d0 @+ L    // `randomizeHeatbugUpdateOrder' Boolean flag we can# v4 ~# E8 Y9 [" g6 ?4 R
    // randomize the order in which the bugs actually run
5 i6 H# p- M# }" e- v$ B! V9 o    // their step rule.  This has the effect of removing any' N4 v4 }$ H$ j! P7 a
    // systematic bias in the iteration throught the heatbug0 e  u8 p+ T( i+ r0 [: \
    // list from timestep to timestep, Q. I: D& e/ K. W  U( t1 Z
        
# y. q: W; {9 \$ K. j2 a    // By default, all `createActionForEach' modelActions have* C8 T4 e2 Y3 B( s: |
    // a default order of `Sequential', which means that the
) ~6 A' B4 h3 A    // order of iteration through the `heatbugList' will be
# x: x# d* T9 L% }( s    // identical (assuming the list order is not changed
$ x) P: S2 A6 y    // indirectly by some other process).. V4 i3 w# l, o7 l
   
- M0 v( L% X' P3 C& V0 i. X    modelActions = new ActionGroupImpl (getZone ());
9 \8 w3 ?, x  M& P& i! T6 t; Q/ t  k! P/ @, H
    try {
( i, d( p3 Q. _. @      modelActions.createActionTo$message
& r! a- ?7 G) e; ?        (heat, new Selector (heat.getClass (), "stepRule", false));
5 v4 J3 I$ w6 b& V/ ?) u    } catch (Exception e) {; O. ]4 q* J: ^! O5 e' ~0 f4 o
      System.err.println ("Exception stepRule: " + e.getMessage ());
( J  D  Y5 W2 z    }; F' C' x% J  z6 ~1 i8 g
' a6 @2 D! j  x6 P* g+ c1 `. u
    try {
* V% K$ X8 I7 ]      Heatbug proto = (Heatbug) heatbugList.get (0);
+ ]8 H) X# `$ Z' h      Selector sel = / y2 N9 }: m) V6 Y& u$ s
        new Selector (proto.getClass (), "heatbugStep", false);. q2 Q/ H7 K$ }$ o
      actionForEach =. ^/ Y0 W* g' D- E+ E6 d' I
        modelActions.createFActionForEachHomogeneous$call- W. x0 c# H9 K7 C2 ~& j- Z
        (heatbugList," }2 C0 E( G$ e# |& U
         new FCallImpl (this, proto, sel," ^% @, w' ]/ L% }
                        new FArgumentsImpl (this, sel)));! h$ h( o; a  Q  o
    } catch (Exception e) {6 Y; B( T& a6 A9 ?% N( v
      e.printStackTrace (System.err);
0 M% ~' p( J* e. \% e2 v; \6 ]! s    }4 r) x% h8 v+ D4 r5 O5 I. {$ g9 L
    6 v5 K# r( {8 e
    syncUpdateOrder ();
6 V- `% f; W. a$ h6 _0 M
( m0 Y* ]% D% p+ ]    try {0 U) E7 w- Y* C$ |
      modelActions.createActionTo$message
; k0 o6 \( r9 k% X8 `        (heat, new Selector (heat.getClass (), "updateLattice", false));5 w; ?" D7 u6 H# @% o9 k, {5 a
    } catch (Exception e) {# F' X* j, g$ b" V
      System.err.println("Exception updateLattice: " + e.getMessage ());: ?: T/ X' W) h4 R
    }7 O8 l& W! v. w5 T/ V0 q2 ~
        ' l9 z& |& F, _# `4 P
    // Then we create a schedule that executes the. \1 o3 k; s0 H! t2 ^
    // modelActions. modelActions is an ActionGroup, by itself it
& x7 Q7 g3 L# g) h6 Y9 B! w* g* m    // has no notion of time. In order to have it executed in* h* U& v8 H7 \
    // time, we create a Schedule that says to use the9 w( K( u, b3 U) _. U( C2 f
    // modelActions ActionGroup at particular times.  This
: Y4 d0 P! [- C) @' i2 I9 _    // schedule has a repeat interval of 1, it will loop every
1 I8 L/ ?( u# @! R7 z0 A* V    // time step.  The action is executed at time 0 relative to8 y3 c1 E7 ~! G" S% a8 s. U. M
    // the beginning of the loop.' Z" ~/ y" b& B
) @* S( r" E0 T
    // This is a simple schedule, with only one action that is$ p/ L# C: m5 h1 ~1 h
    // just repeated every time. See jmousetrap for more
( C, C3 X3 Q* e    // complicated schedules.
5 S4 a9 L% P6 s5 ~. A' J- ?) b  
% O0 c0 g. A7 p/ E# X1 l  j: i    modelSchedule = new ScheduleImpl (getZone (), 1);
- z3 f2 q& H  ^  K' l    modelSchedule.at$createAction (0, modelActions);3 u. E/ u7 b4 M2 x4 t
        
: y% K, a; @5 f1 G    return this;# [6 k! d2 F+ v3 J. h" q
  }
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