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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:1 M$ x% Z3 r: v0 N+ [
% i. Z3 Q7 K- n  g* T
public Object buildActions () {
8 z  T% H8 ]  B& _+ ^    super.buildActions();& f5 M6 ^2 v; R$ a3 k
    & R& X# ^  D* d
    // Create the list of simulation actions. We put these in
& M* I6 }+ [& b4 b3 w2 D    // an action group, because we want these actions to be
$ k& ~' y. W( H$ P: p% `    // executed in a specific order, but these steps should6 w1 H1 e" \% e0 f: j7 s4 M
    // take no (simulated) time. The M(foo) means "The message$ f( w& q% j- }
    // called <foo>". You can send a message To a particular7 x# b( R$ ?5 P$ R( Y( K0 e
    // object, or ForEach object in a collection.& G2 @- G: H# C- a% N: Q7 o. Y
        
* u: D; K" \& @- y) G    // Note we update the heatspace in two phases: first run
. Z* I# c6 |, {" M- S( g    // diffusion, then run "updateWorld" to actually enact the
& u. z: m4 |1 l  d, ~! m    // changes the heatbugs have made. The ordering here is# f+ J/ ]1 }2 b( ?
    // significant!
4 n% K9 |! U/ k1 ^% @1 u; E        ( {' H' }. N8 O' R" @3 V$ h5 P
    // Note also, that with the additional# l& U6 j. z& E- z6 ~
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
7 w* a" k6 A9 _( N: }    // randomize the order in which the bugs actually run
! X% p! |8 a9 g    // their step rule.  This has the effect of removing any
( @9 R3 ]. v) }, d6 B1 x    // systematic bias in the iteration throught the heatbug. Y- Q% k4 o! e
    // list from timestep to timestep! Z6 O; S1 D& Z, Z. g! O* X6 [  j
        0 d6 c8 m$ h0 L, D. F, e6 N
    // By default, all `createActionForEach' modelActions have
/ {2 l) E. h, Z  b0 A7 b9 u    // a default order of `Sequential', which means that the
' D3 a" e4 s( ?4 {& H' M7 |! n    // order of iteration through the `heatbugList' will be
( Q6 k( }+ ~- o2 a    // identical (assuming the list order is not changed
5 _, f5 _+ l! {( }7 \1 b; C+ r    // indirectly by some other process).; i) W# z+ z/ d' _1 N* \9 \/ `8 R
   
" W) S& G7 r/ p# }7 z# y( o    modelActions = new ActionGroupImpl (getZone ());
# G8 S# V8 k$ I8 s, m- j) |
7 |/ ~9 K' Q) R# q% t% P    try {3 D7 G+ h2 h7 u& I8 U; S6 b
      modelActions.createActionTo$message
" T" u- E+ i$ e        (heat, new Selector (heat.getClass (), "stepRule", false));
0 a3 \  [8 i2 B: G' T/ W    } catch (Exception e) {
  i" e; {3 h* i) Q* R; X/ ~9 `  _      System.err.println ("Exception stepRule: " + e.getMessage ());4 H* j2 ^) r) Q7 B( a( X; o7 N
    }. y* H( W( U2 O  h" A% u' }9 Q* ?

4 ~: N7 V  [  B; q  i' p. k' E    try {" W) V# F% t% K) J6 o
      Heatbug proto = (Heatbug) heatbugList.get (0);
" F7 Z5 W, }* q) o      Selector sel =
) t$ ~" e  Q( u  j( y" f1 ~/ ~& R! S        new Selector (proto.getClass (), "heatbugStep", false);0 D; [0 k9 E6 o$ W6 b8 F4 u
      actionForEach =8 Y+ L; F8 M5 [" N* z9 \' }! N1 k
        modelActions.createFActionForEachHomogeneous$call0 W6 z( o; _8 _- w5 r
        (heatbugList,/ U9 h$ I: c4 o1 S" V
         new FCallImpl (this, proto, sel,5 M- Y' ]6 Q3 ]
                        new FArgumentsImpl (this, sel)));
' v' r# ]9 j& W% Z" q, X    } catch (Exception e) {6 {8 p% @5 h* ~* `9 s
      e.printStackTrace (System.err);& R" m: V. `3 d( X  ]+ I1 Q
    }
5 z" w- n% \4 b( p4 E3 h    ( H2 n1 U, S3 G( O- d! B( w$ u
    syncUpdateOrder ();7 W, R# ]: [% G. r: Q) ~  J$ C
# F% [3 \8 A) [! `- R
    try {- x* x, q$ B# o
      modelActions.createActionTo$message 9 f  ]( G& g, x5 ?  U# t9 U# J
        (heat, new Selector (heat.getClass (), "updateLattice", false));5 k, J4 N1 I4 u1 U) w
    } catch (Exception e) {* D, u/ A: Y6 g* }7 s
      System.err.println("Exception updateLattice: " + e.getMessage ());
: h$ _' w, M' L1 [' R  {7 m    }
, N. k4 m& z' q0 I! p        
6 I4 _9 i  E0 ^# L    // Then we create a schedule that executes the
. h6 l- ?/ }, _2 i0 T8 d. c    // modelActions. modelActions is an ActionGroup, by itself it5 D# k% W/ Y& R9 H* k1 N
    // has no notion of time. In order to have it executed in& {- a! T5 M4 g" v5 C! u
    // time, we create a Schedule that says to use the
" l0 o" z; Q- I- X4 y; V    // modelActions ActionGroup at particular times.  This3 [5 \8 d$ h# l  U7 c1 a
    // schedule has a repeat interval of 1, it will loop every) V9 `7 ?  `8 y- C9 d& i
    // time step.  The action is executed at time 0 relative to
  q" s* x( c; \1 x! i. s    // the beginning of the loop.4 o$ L2 U! L7 ~( x
3 i' z' j: ]( I/ j% a# B" T
    // This is a simple schedule, with only one action that is  Q+ b( M0 n8 j, p/ J* f4 B# Z
    // just repeated every time. See jmousetrap for more8 ]0 d" B6 W/ E# l
    // complicated schedules.- B" x7 h) ~" K  P3 U" a3 O7 {
  4 {7 V: N/ O3 Y3 f5 r
    modelSchedule = new ScheduleImpl (getZone (), 1);
; A7 @; A' N. |: I" A& I  X    modelSchedule.at$createAction (0, modelActions);
7 I! s! H2 Q' t        + P. q6 E$ |& [% G1 I& m
    return this;; w! G# w. Q$ l' G
  }
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