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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:5 u. }) |1 F8 ~3 {4 \! T- U! m

/ R/ Z8 Z! i: `; K( M3 l public Object buildActions () {4 Z, N8 a6 o. y1 Z% N" {2 Z
    super.buildActions();
- N, G/ s- S( K      p. V" G8 s8 L9 ?
    // Create the list of simulation actions. We put these in! L' B7 V. ~0 {4 Z; |' V; w/ Y
    // an action group, because we want these actions to be2 n5 ^" o4 U5 v
    // executed in a specific order, but these steps should
) h8 b; M0 d$ p5 X/ [  O. o+ ^# T    // take no (simulated) time. The M(foo) means "The message: I  K2 s. Y. e
    // called <foo>". You can send a message To a particular
8 M. Q: b5 d* [0 T* y( K    // object, or ForEach object in a collection.
9 r9 o! V. k' Z. m1 f  x        
+ P5 }% q- [0 z/ ?6 n5 |    // Note we update the heatspace in two phases: first run
. r' G5 W3 q5 U0 O: C9 ~    // diffusion, then run "updateWorld" to actually enact the
6 g) p* m0 C5 z) U: v    // changes the heatbugs have made. The ordering here is
  `: ~3 T4 f6 D    // significant!5 Z$ @. ^- H. m* t0 E! V: C5 L
        / ~  ?, v' x' d% X. T7 L# r6 o6 ^
    // Note also, that with the additional
  o  t- A* k! b# F( ?    // `randomizeHeatbugUpdateOrder' Boolean flag we can
# v5 S1 @& z" q( p7 y- _. l4 h* P    // randomize the order in which the bugs actually run
5 \/ A, G, c& _; u    // their step rule.  This has the effect of removing any9 W# k( g2 d# f- v/ V5 j' J# \
    // systematic bias in the iteration throught the heatbug+ s% j" q3 h+ e; V- t4 m, {& a
    // list from timestep to timestep
- G, @. w3 I' \5 D) |: I" h. J        2 i: @5 t  m7 k9 d9 K, Q- N3 Z
    // By default, all `createActionForEach' modelActions have; Z8 _0 c0 v  p" y/ [9 x. f% W
    // a default order of `Sequential', which means that the* a& g1 X# v* P, o
    // order of iteration through the `heatbugList' will be1 B' W7 Z( b& i1 w! h6 O; ]
    // identical (assuming the list order is not changed
4 |8 u8 Y( D3 r8 K' [9 }    // indirectly by some other process).
& k( S7 U$ r( q& l8 e    ; I) O( a. G/ e" N( L7 o" B
    modelActions = new ActionGroupImpl (getZone ());1 M" b3 V5 V% [
6 p  u! P! P% I5 f7 T8 D
    try {( R& o6 q3 S* _5 A' K6 B
      modelActions.createActionTo$message' m" J9 r* y6 }- j
        (heat, new Selector (heat.getClass (), "stepRule", false));
6 Z% p% l' ]4 `' J$ f    } catch (Exception e) {2 v1 {2 `' ]$ Q+ T( ]
      System.err.println ("Exception stepRule: " + e.getMessage ());
4 ~7 R& Q( c0 a$ R2 Y    }0 X8 @' r* O! p
- ?* Q4 F+ M6 t! M
    try {
  `  k9 b4 |# ~8 Z' t+ S6 y      Heatbug proto = (Heatbug) heatbugList.get (0);6 }  I: U2 D  U- L% ^) T1 R' O
      Selector sel =
# J+ k) [: N: [! \* E% l2 [2 a        new Selector (proto.getClass (), "heatbugStep", false);
0 @6 E- C8 F0 s& J2 }$ j      actionForEach =
5 R9 `% R+ O. U- N. r4 S4 Z        modelActions.createFActionForEachHomogeneous$call. u2 _2 `/ J+ Q
        (heatbugList,
8 e& T( @* z3 T         new FCallImpl (this, proto, sel,, f- o2 S1 a, ^& u/ b; ]
                        new FArgumentsImpl (this, sel)));
9 B: c2 C' G& c, {    } catch (Exception e) {
2 F2 o. I& F9 b      e.printStackTrace (System.err);& R5 X8 y' d6 \. Q/ X8 z
    }
  C9 Y7 e2 n* n: r   
4 u( r& z$ W3 w' X5 V, C    syncUpdateOrder ();
/ ^3 R5 {0 y. o  l" T4 p7 h# V% X0 ~7 @, @6 n6 [$ \) i
    try {
6 S4 F5 `- k% m& s: h) H* T7 U      modelActions.createActionTo$message / k% R! f1 o6 r$ p% R2 O1 o0 a
        (heat, new Selector (heat.getClass (), "updateLattice", false));% N3 ^, S% D. f' |9 y, C3 t' w( Z
    } catch (Exception e) {! E. @2 b" e7 E* V& ]# d4 {
      System.err.println("Exception updateLattice: " + e.getMessage ());
: O/ Q  e& U% i# V    }
7 B9 d2 e0 P( N' ]        ' V: n1 q% v* ~9 @6 X8 S
    // Then we create a schedule that executes the6 K' R8 u! L) [0 D: T. r) e
    // modelActions. modelActions is an ActionGroup, by itself it
  x& G! S# m8 b# h# ?    // has no notion of time. In order to have it executed in
; c6 R/ l, u; o$ q* V% w- j    // time, we create a Schedule that says to use the
" g& d& \! c- C- M6 R3 |2 b    // modelActions ActionGroup at particular times.  This2 t  y0 Y8 U) m) ?% Y& b7 T' h
    // schedule has a repeat interval of 1, it will loop every
/ [$ L8 m$ q* k$ i. q1 ]2 r& B    // time step.  The action is executed at time 0 relative to7 k* Q, R' ?" k. _, L' V
    // the beginning of the loop.
! g0 r1 e5 ~) W7 q9 Z, X  d/ w
5 d6 g+ N$ ~5 \+ a5 ^    // This is a simple schedule, with only one action that is
5 }2 L2 V  Q2 a5 D    // just repeated every time. See jmousetrap for more% ?- }; S- @- _; m$ \% \
    // complicated schedules.
: O( @4 V8 X  E  
* w3 F3 A! ~! h# u/ z3 ]    modelSchedule = new ScheduleImpl (getZone (), 1);
) ?3 d- E( P* w+ u    modelSchedule.at$createAction (0, modelActions);
. M- }/ I. u) a, ~$ ]1 c) c- L        8 U9 W3 T& o5 j9 ~3 a
    return this;
7 U1 O; A. z8 z0 m- T: ~  }
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