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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
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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:$ Y& H- Y5 Z/ c$ J8 i& }
2 g. c( {) C6 g6 ]
public Object buildActions () {2 Q# F6 p* m2 Q
    super.buildActions();
4 W) |% n1 i  N, F1 c   
8 g5 b- V0 M' S3 C8 K0 u    // Create the list of simulation actions. We put these in9 w& _  U' _* d. o
    // an action group, because we want these actions to be
2 q* J5 Q- e' o/ x" ~0 K    // executed in a specific order, but these steps should( q1 c: v# }0 v) n; L8 r0 S! Z
    // take no (simulated) time. The M(foo) means "The message2 D& b1 l1 B8 q& ^  w
    // called <foo>". You can send a message To a particular* `2 @7 f, v0 f3 M3 B8 c
    // object, or ForEach object in a collection.
$ p  _: g3 m" O/ Z        
: C7 `* ~& D$ X; l- K    // Note we update the heatspace in two phases: first run  \2 [) w: q& v( Q2 f& O6 L* @
    // diffusion, then run "updateWorld" to actually enact the3 n8 P- V6 K7 }4 q7 h
    // changes the heatbugs have made. The ordering here is* ], _* w  Z% Z9 F( d
    // significant!/ m/ O1 t7 c- n, {
        
# t1 ?' t4 R3 @& l    // Note also, that with the additional6 e7 l* ?1 T2 f( G' \, A1 V+ W
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
+ R& U& [2 @# ]    // randomize the order in which the bugs actually run( e$ g6 J0 W+ d2 {2 N$ n
    // their step rule.  This has the effect of removing any
: ?% i  t0 p9 x/ ^  z% b6 Y    // systematic bias in the iteration throught the heatbug* |# P3 K6 o# F/ q/ I
    // list from timestep to timestep1 l5 [8 H7 g7 J; j
        5 V$ Q+ X7 ]% \* ?+ p4 e
    // By default, all `createActionForEach' modelActions have
8 \1 k; ^9 c( Y9 A  S0 V8 e    // a default order of `Sequential', which means that the
+ v" }/ O7 J1 v: I+ r* b3 l3 i  I    // order of iteration through the `heatbugList' will be
) U/ t) `- h2 p    // identical (assuming the list order is not changed/ J9 ]) l. m3 K* {. e4 x
    // indirectly by some other process).+ @3 K, R8 F2 p+ u, n2 y
    * u4 p6 z- \+ x
    modelActions = new ActionGroupImpl (getZone ());
4 G; i& `% t+ B& D7 I+ \* j$ ~6 R9 S0 w, f5 x- w( x. Y
    try {  q8 S+ i  x+ O0 ~3 B. p
      modelActions.createActionTo$message2 k% F7 V+ ~5 I  m
        (heat, new Selector (heat.getClass (), "stepRule", false));) h' N, n- O- D% h
    } catch (Exception e) {
2 ]5 E+ m3 ~4 u( R* T      System.err.println ("Exception stepRule: " + e.getMessage ());( R( m/ K+ [& g' j9 ^+ W; r
    }
- ~+ c" p2 ^5 R3 m* a+ P) m& z3 |+ z2 }: Y
    try {. ]% e- @# S8 g; \% S
      Heatbug proto = (Heatbug) heatbugList.get (0);; l  w& w1 g; m2 w1 ]9 G% W
      Selector sel = 4 Z/ f% E' \' P$ j. e
        new Selector (proto.getClass (), "heatbugStep", false);
; M8 T' l! @- A0 J# }8 n      actionForEach =% E" j. ]/ N4 G/ J2 ]3 h. `
        modelActions.createFActionForEachHomogeneous$call
, E8 D6 q5 H/ g( O        (heatbugList,8 j- u+ W+ D! o: b4 T5 e9 h! ^
         new FCallImpl (this, proto, sel,
, B* j6 D$ V6 K8 A2 l* t                        new FArgumentsImpl (this, sel)));8 Y+ D; m6 C% Z# z5 v  N
    } catch (Exception e) {) p# @) |/ E$ Y9 p
      e.printStackTrace (System.err);4 D  H- S4 w, d& X# c
    }' O# G2 q3 |6 n+ W( y5 |! p. n, C
   
0 U1 }. u, _" T# E4 \    syncUpdateOrder ();; Z1 P- r: l; R8 C( X) I+ w# T% ?
7 Q( I% t( w% x( V
    try {
( v8 s, k# U" b      modelActions.createActionTo$message
* H' u) M9 H+ M. G7 G$ z* a9 R$ I        (heat, new Selector (heat.getClass (), "updateLattice", false));
3 v5 X+ J8 _3 o8 D# Q9 G, W    } catch (Exception e) {
! c0 H3 i' h7 c  @% A5 D6 N2 B      System.err.println("Exception updateLattice: " + e.getMessage ());, n( i3 ?; |3 J' ?
    }
- h. g; e8 i/ m0 i        
; |# R! A0 V* j% D! {6 d" U  e    // Then we create a schedule that executes the
2 G) ?% V7 G7 B7 ?3 X    // modelActions. modelActions is an ActionGroup, by itself it8 q: O/ Q+ u9 ?) j8 s: U
    // has no notion of time. In order to have it executed in, j' B: |8 W; S
    // time, we create a Schedule that says to use the
: w* V' p- h1 W; ]3 A6 T- n    // modelActions ActionGroup at particular times.  This3 U  x! X; p3 |+ S7 ^5 }- Z
    // schedule has a repeat interval of 1, it will loop every" W9 A4 ~  q+ V! ]5 W6 F8 ^$ }
    // time step.  The action is executed at time 0 relative to
) ], S8 J* J; g! z& c) ?    // the beginning of the loop.
5 n1 q  j# N, B5 [
1 D! i9 M; Z9 u& o    // This is a simple schedule, with only one action that is4 r9 }3 [8 N7 q9 G# M5 q: k
    // just repeated every time. See jmousetrap for more, x( x2 a$ {4 @* O
    // complicated schedules.! ?" ?  H9 g8 W9 {
  ) F6 ~! \# ]& T* r) t
    modelSchedule = new ScheduleImpl (getZone (), 1);
0 m/ ?' v2 {4 i" _! @7 s    modelSchedule.at$createAction (0, modelActions);
" Z% b" x) K( T4 F/ S" Z" P        $ \; U8 H- A! f4 ]
    return this;- B, d3 H. u9 F: G+ u7 R. q, ?+ @
  }
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