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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:: F1 z( p# ?: l' a6 H" ]

- u# c$ j4 p/ N- a& `, H public Object buildActions () {- s# s5 X' ^; q
    super.buildActions();
0 K% x6 g& |% `1 y" ~: m    ' D3 W3 R5 n& O* \0 t+ k6 O4 E8 g
    // Create the list of simulation actions. We put these in2 o2 ~6 t( Y' Z& v
    // an action group, because we want these actions to be
5 i$ q' Q" p0 K1 m    // executed in a specific order, but these steps should/ C0 G4 @! n& w/ S" ?
    // take no (simulated) time. The M(foo) means "The message
; ]7 _) P8 @; S- d! t    // called <foo>". You can send a message To a particular- b/ y" V& `& g# T, o' N0 j5 @7 x
    // object, or ForEach object in a collection./ \& V* n0 c! v! R1 f/ ]+ W
        2 G5 o$ ]0 c6 \$ a. O
    // Note we update the heatspace in two phases: first run
0 i! V' s) y) J; ~# t; O    // diffusion, then run "updateWorld" to actually enact the
+ S; f9 K3 r6 C2 t5 l    // changes the heatbugs have made. The ordering here is; I3 s# L) d: ]( F& T7 V6 \2 \0 R
    // significant!
# g- |7 q# m0 D. |1 L        
2 {  }/ `) a8 T) h& y    // Note also, that with the additional% t5 x) V  I; e4 l
    // `randomizeHeatbugUpdateOrder' Boolean flag we can2 B; D" T( m/ I+ W
    // randomize the order in which the bugs actually run" u' r9 t8 i7 J- z/ D
    // their step rule.  This has the effect of removing any
8 \5 ^3 U. [! h  C. x( _+ I    // systematic bias in the iteration throught the heatbug( Z: R; Z2 [" m9 |6 \  }
    // list from timestep to timestep4 \, U; y0 H5 u. I
        ! o4 J5 T1 O+ `; P* f, Q( I# y
    // By default, all `createActionForEach' modelActions have: ]8 R4 }; [0 I  w1 y; v
    // a default order of `Sequential', which means that the8 P% k0 s& k, S$ B
    // order of iteration through the `heatbugList' will be$ ^! W# ?8 \1 k  ?
    // identical (assuming the list order is not changed
% s$ S) F) r8 ^4 F) T    // indirectly by some other process).
) R& b4 J8 z: p    $ ]8 h1 h) M, O+ ?
    modelActions = new ActionGroupImpl (getZone ());2 p7 Z- E* b9 p$ _7 |
) m" ~7 s0 V% q( O9 W
    try {
; U& h& I2 R) w$ D: i$ S: \$ F      modelActions.createActionTo$message
/ Z7 S7 g% U' t; w% o' i% X        (heat, new Selector (heat.getClass (), "stepRule", false));- r4 Z0 c; f- _/ A1 {
    } catch (Exception e) {4 Q9 l- k$ |9 |( P2 H$ \( k1 g
      System.err.println ("Exception stepRule: " + e.getMessage ());8 A. o! Z; g# v6 Y
    }
7 o  n, R2 Y! Z! G* J( E& Z
  U8 D( J% A8 n, I" B) Y    try {. c( n' k& K+ `" K$ y* y
      Heatbug proto = (Heatbug) heatbugList.get (0);1 @6 C: W" [* `, l, N% c
      Selector sel =
  g6 q* V# y3 n3 l: d" D. ?        new Selector (proto.getClass (), "heatbugStep", false);
7 n. f' l2 ~- H      actionForEach =
7 `: a4 F3 _4 }6 S" }1 g- S1 c        modelActions.createFActionForEachHomogeneous$call
, ?9 \7 o5 i7 O/ s- z6 E        (heatbugList,8 k/ T4 e/ H+ s3 W
         new FCallImpl (this, proto, sel,
2 e: Q; i( R. F. [- R( T                        new FArgumentsImpl (this, sel)));  K: T. m0 X( Z
    } catch (Exception e) {" _/ D' ~7 V  P  S) K
      e.printStackTrace (System.err);
* b0 W7 B1 w) p7 ]    }! Z4 o( R2 {- z8 Q) v& _% x
   
5 L6 ^0 M3 B3 I0 b    syncUpdateOrder ();
2 l7 m' x8 {. H3 ]" S( m3 S  [, f2 u$ F. y2 @
    try {
# J3 E2 ^2 H/ T+ A, E      modelActions.createActionTo$message
3 o9 O# S* ?7 \/ {" m, G        (heat, new Selector (heat.getClass (), "updateLattice", false));
& f' M6 F( N6 p    } catch (Exception e) {
7 `9 Y! L7 O+ G; `0 p      System.err.println("Exception updateLattice: " + e.getMessage ());
  M  l4 y: O/ L+ h    }
: a: A% e' e) F% t        
1 l" g! A2 [8 N( ?- B8 U    // Then we create a schedule that executes the
) ]9 T$ _1 n& q8 p5 {8 p4 h    // modelActions. modelActions is an ActionGroup, by itself it
1 j: K; c8 Q) |- A+ M    // has no notion of time. In order to have it executed in
3 R+ q% e- W4 N, K8 J; j    // time, we create a Schedule that says to use the6 H& {' b" w& B/ L( _6 k
    // modelActions ActionGroup at particular times.  This
1 k- P' m- w* U; C& P4 G" W1 c4 S    // schedule has a repeat interval of 1, it will loop every5 C( x' G. I: h4 Y3 D! l+ r
    // time step.  The action is executed at time 0 relative to
1 a* K+ T0 ~1 r* R" i! ~* v# `    // the beginning of the loop.1 S6 t! t' L, w' I& x0 k

/ Y8 U) `! X" n, C+ g: S  I    // This is a simple schedule, with only one action that is5 d3 r- B. p5 B3 o
    // just repeated every time. See jmousetrap for more
5 X. _3 E# q1 d& [" f& e    // complicated schedules.
7 G9 l" y/ b( h$ O4 D' ?6 Z  . \9 `+ @& R! p
    modelSchedule = new ScheduleImpl (getZone (), 1);+ L1 p: w. Q5 s8 t: z
    modelSchedule.at$createAction (0, modelActions);% e  g. ]# l% l! L
        
4 p) n- N9 P# t+ H  o: _    return this;
) E8 m. J/ M5 P, u( W  }
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