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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:
* X5 Z" e4 ]4 z2 F; \1 n& j7 k. |3 H$ o0 x( A: \
public Object buildActions () {( [* i4 I! D- {- |
    super.buildActions();
' ?9 x& f- W" ~   
# c0 ?2 Y% D6 w7 R& ]: e5 T    // Create the list of simulation actions. We put these in
2 M" \8 }- \7 W: [9 s    // an action group, because we want these actions to be
; F+ Z( r7 q2 p# Q    // executed in a specific order, but these steps should% s* S% Y9 c) r! q0 B! c6 Q6 |
    // take no (simulated) time. The M(foo) means "The message, ~: t! \$ X3 W) E6 _7 H
    // called <foo>". You can send a message To a particular
( s# E8 |6 ?8 q    // object, or ForEach object in a collection.
# J' z+ q3 g# H  J+ u/ N7 @) ~        4 n/ s7 ?: @4 q/ S$ l, y6 ?
    // Note we update the heatspace in two phases: first run
: h2 S) b( o) m( n    // diffusion, then run "updateWorld" to actually enact the
' A! Z: _1 G; f5 v    // changes the heatbugs have made. The ordering here is
5 X. I/ m: G* t& t! A8 I    // significant!0 ]+ I* I* G! y4 H" y$ u' {, O1 O% y6 @
        
9 n! d$ K! H4 @    // Note also, that with the additional( Q* u* [9 e) C
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
9 ?( C9 o4 D% K    // randomize the order in which the bugs actually run+ w6 h: \9 Y, V8 p
    // their step rule.  This has the effect of removing any: R" T1 `( l: d* s; L& F5 Q
    // systematic bias in the iteration throught the heatbug4 O' d/ {5 `* K0 b9 v$ g0 ~
    // list from timestep to timestep7 H* m. f: a) m4 U
        
9 ^# G) M* Y' B    // By default, all `createActionForEach' modelActions have5 x% L* i' \0 X) O4 l  }
    // a default order of `Sequential', which means that the
6 q" b- }7 D1 L( u2 K$ S5 Y' \    // order of iteration through the `heatbugList' will be
/ w* Y4 a1 c. i# B1 P    // identical (assuming the list order is not changed( v- g* T2 \1 F  j9 D" p
    // indirectly by some other process).
1 j5 Y( s0 \7 ~8 A  _    & b( P% A# f3 R3 I1 C% U
    modelActions = new ActionGroupImpl (getZone ());
# L$ M1 D3 Z* o5 V  b( P; Q; j/ c6 l8 e3 a2 j% G
    try {9 _1 j( v6 n( U' ?' {
      modelActions.createActionTo$message
2 J6 i8 w# O) L8 j        (heat, new Selector (heat.getClass (), "stepRule", false));( S) [( b0 E' x$ X" N. q9 J+ s
    } catch (Exception e) {: v" A# i, A8 h
      System.err.println ("Exception stepRule: " + e.getMessage ());
) q9 G, p5 z% V) m    }
0 K9 [0 K. m1 ^8 D: X, e! X
: a# d9 Y* {; O# c    try {
# b' `1 g4 ~7 c3 `6 {      Heatbug proto = (Heatbug) heatbugList.get (0);
- n" |- N! g2 V+ j      Selector sel =   B& c0 q: v* x& S( Z" X
        new Selector (proto.getClass (), "heatbugStep", false);
6 h" M) J' V  [5 _; E$ I      actionForEach =' e8 T/ M1 o0 S- o5 F
        modelActions.createFActionForEachHomogeneous$call
' y0 X0 @7 S  X        (heatbugList,/ T! g$ W5 M3 ^0 m
         new FCallImpl (this, proto, sel,. h- Z1 F/ o8 p% f' Y/ ?/ p
                        new FArgumentsImpl (this, sel)));9 f: e; K6 k. p+ K" ~: [% A6 a6 M
    } catch (Exception e) {
/ C3 e8 I7 Y2 Z$ l' o/ |! R3 R      e.printStackTrace (System.err);
& K8 f5 h( ?4 h3 w6 [. i, R    }1 z& a8 E+ u( n( R& w
   
0 y# R3 i+ w( t3 X$ N    syncUpdateOrder ();3 k6 a, u& U& u* J; X. E" g

0 T7 e* }$ E$ G+ X2 R    try {. {& B9 W8 P+ J! T5 K1 w/ }
      modelActions.createActionTo$message
+ _6 d' p7 K6 c5 |0 y# ?. c        (heat, new Selector (heat.getClass (), "updateLattice", false));0 k) Q8 }$ b" M" O$ h! f  G
    } catch (Exception e) {$ U( I5 f2 L0 A0 {2 D5 I. a% ^9 G1 u# P
      System.err.println("Exception updateLattice: " + e.getMessage ());
1 H9 u3 T$ @1 j* L    }4 K( @1 [+ X9 u
        
0 {8 e! ?9 g, {6 I( w- [    // Then we create a schedule that executes the
) K5 R8 N* q6 |6 H8 Q$ e5 e7 |    // modelActions. modelActions is an ActionGroup, by itself it
' x9 B8 Y& ^' N: v7 N    // has no notion of time. In order to have it executed in& r3 {& n9 }4 J9 o5 ]3 b" q
    // time, we create a Schedule that says to use the
$ ]- T7 r5 W0 i) F9 E    // modelActions ActionGroup at particular times.  This
: O. l/ V. r. z; Z4 Q2 F    // schedule has a repeat interval of 1, it will loop every
0 [$ |2 y7 Q( Q0 U# F, M    // time step.  The action is executed at time 0 relative to6 o* t& I4 N/ p3 J$ G% y
    // the beginning of the loop.
/ ?: v7 |- p8 q2 u1 @# f
$ M+ H' ~8 z1 {6 `/ ~& M  W# r/ J    // This is a simple schedule, with only one action that is* o3 u1 m  P2 r0 H: V. ]# I
    // just repeated every time. See jmousetrap for more
9 M: u' N  s" u0 {, I+ L# b    // complicated schedules.4 |1 U; Y9 `7 }1 g/ q# L  S
  
- c/ L' e! G# L* n$ M$ k4 V( O  k' v    modelSchedule = new ScheduleImpl (getZone (), 1);) Z) S( {6 p; M! y
    modelSchedule.at$createAction (0, modelActions);$ ]9 K! `7 \8 y1 U6 ]0 C/ v
        
! b" {+ Y8 _) k$ r    return this;
1 y$ r( e6 X6 z  }
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