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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:; ?0 g' w/ s/ F) O4 a) \6 B

( Q! U. t2 v6 J- _5 s public Object buildActions () {
: K! b7 A5 ~: E0 @/ L) y) b    super.buildActions();8 G9 T& W1 I6 d5 W1 z8 T1 c/ ?
    , P) W5 {/ B. g: Q+ q8 }
    // Create the list of simulation actions. We put these in- B$ N5 R  X: p$ @6 X; b# v7 i$ k
    // an action group, because we want these actions to be3 j% U: _& u. v, ]% P
    // executed in a specific order, but these steps should
5 G$ a8 ]% ^) d7 [# T) w    // take no (simulated) time. The M(foo) means "The message: D" b, `% E2 V8 [
    // called <foo>". You can send a message To a particular
- L; e. L  T' i# v, K+ i7 T    // object, or ForEach object in a collection.
* u& e& U( @2 [! R        
  T- s, u; ]% J, Z" s    // Note we update the heatspace in two phases: first run
$ L+ L) D" n" g' p- A    // diffusion, then run "updateWorld" to actually enact the& j7 i8 k1 r0 z$ e
    // changes the heatbugs have made. The ordering here is
2 O/ B! j7 B' a' R4 y    // significant!
$ f5 B( C; o2 O# w/ ]6 T; |7 Q        
! {0 }2 p+ e, s# {    // Note also, that with the additional
6 l4 m. u: P7 [, o( ?    // `randomizeHeatbugUpdateOrder' Boolean flag we can
( }( J8 {0 L; K& g    // randomize the order in which the bugs actually run: X; Q6 f( H" N
    // their step rule.  This has the effect of removing any; I+ X8 r: E  R' J) q& r
    // systematic bias in the iteration throught the heatbug
5 z% f4 e" l! m$ K1 O    // list from timestep to timestep
+ A& L; B7 q* @( n. M! o        
( y& l1 [. u3 V2 b% [1 J    // By default, all `createActionForEach' modelActions have& i: m9 U$ N9 C/ S% d! s
    // a default order of `Sequential', which means that the
: j& b1 T, k* L5 w, K7 Y( y    // order of iteration through the `heatbugList' will be' \/ N7 s* V, a9 i$ X- N
    // identical (assuming the list order is not changed
& E. E7 g. l3 }1 Y: d: F" e4 P- |. @    // indirectly by some other process)., _: Z' H9 E: P; f8 a
    4 Q7 _! D, \/ P: x# S0 ~# F! Z, [5 ^6 h
    modelActions = new ActionGroupImpl (getZone ());/ {! Z& p7 O' D4 ?3 C' i
( D! j9 \6 P; P; Y! ]
    try {1 q9 ?0 T( ^3 j/ x/ m
      modelActions.createActionTo$message
, S3 s. P' Y" @+ Y$ \% G+ ~. a        (heat, new Selector (heat.getClass (), "stepRule", false));0 Y/ Z1 G, H3 P2 L% a
    } catch (Exception e) {) Z' ~6 O% L% X$ y
      System.err.println ("Exception stepRule: " + e.getMessage ());
+ `; t% }" c% c' z# i8 W+ |    }
6 F2 v+ L3 N9 _$ r5 |/ I- [* x6 F
    try {
  o7 N4 V6 D2 @      Heatbug proto = (Heatbug) heatbugList.get (0);
8 S6 @( Q# x! ?1 X      Selector sel =
( V6 u0 _5 f0 R( h4 N% x        new Selector (proto.getClass (), "heatbugStep", false);
' ~: ?! ?  T! ^3 r      actionForEach =2 i! b" p* n+ Q$ }( o" K4 v
        modelActions.createFActionForEachHomogeneous$call
8 ?$ n; C8 ?1 [3 P$ o        (heatbugList,1 J$ {0 n$ c" f; |  @9 K
         new FCallImpl (this, proto, sel,
; n# G5 x9 Y+ @% p  \                        new FArgumentsImpl (this, sel)));
$ |' g: R( p" f) ^    } catch (Exception e) {
! X/ I) R1 F1 Z4 T$ e# M      e.printStackTrace (System.err);
- b; O2 h8 |6 K9 H    }2 j* o) i9 W& Z. ~" v8 u
   
: @- L, L. F  E+ X( A    syncUpdateOrder ();5 U' h$ C" |) U+ J# _" a
# F+ H% {- B% g7 |5 K
    try {8 K" L" E/ W) i  W: _" M! N
      modelActions.createActionTo$message ) W9 ?5 y  Y! |6 t6 l2 a0 f- s/ X" z
        (heat, new Selector (heat.getClass (), "updateLattice", false));
' g, }1 m" U" L+ x' X$ c% I9 q; a    } catch (Exception e) {& i9 b3 C2 t8 L4 d
      System.err.println("Exception updateLattice: " + e.getMessage ());
6 g; X5 i( x% B, Q/ b    }
! I* p. L5 H/ _+ o* U7 r        
: Z) E+ d& N5 [* r/ o    // Then we create a schedule that executes the
: l: m( f9 n. l0 \    // modelActions. modelActions is an ActionGroup, by itself it
, R5 x; W9 g5 g- Y    // has no notion of time. In order to have it executed in0 D0 Q; x. ?9 L  Y  W
    // time, we create a Schedule that says to use the+ @3 r+ N/ f) F
    // modelActions ActionGroup at particular times.  This5 h/ }' I: h2 |8 P7 [1 x
    // schedule has a repeat interval of 1, it will loop every) `7 A* C5 X2 v- j/ c; s
    // time step.  The action is executed at time 0 relative to
+ q" a) E6 C8 F5 a8 }7 S/ l    // the beginning of the loop.
: X% g8 v9 F4 @$ b" x5 P( N
; E  o9 F) I0 g! c4 W+ x    // This is a simple schedule, with only one action that is
" p% P  V+ K4 k$ \    // just repeated every time. See jmousetrap for more/ Y  W* x4 X% @. p  Q" q$ m3 y
    // complicated schedules.9 _5 S; ~3 \& E4 B" L& v$ m
  
, b; }" P5 I/ Y- B: |    modelSchedule = new ScheduleImpl (getZone (), 1);* Y( I: O6 f  P
    modelSchedule.at$createAction (0, modelActions);+ F' c5 ?+ e9 f+ Q
        
2 `2 x* r2 m1 B2 l3 ^    return this;# ?: h6 U! l# p" }# T
  }
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