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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:
/ c8 Y9 I/ l2 K6 _) g/ \, t  j- H5 ]6 k
public Object buildActions () {
& s' P* `4 [# C, d  l4 E    super.buildActions();
8 t2 N0 k4 z4 X9 u   
6 I' Z" B! V) z1 s, K    // Create the list of simulation actions. We put these in
0 t3 U) n0 T* k1 d5 _9 S2 O" q* ?    // an action group, because we want these actions to be1 j* R4 ~5 a( `) h3 h: p
    // executed in a specific order, but these steps should
7 D8 f: C+ W- {: G    // take no (simulated) time. The M(foo) means "The message4 s8 v/ y! p$ V, |* c* F! k+ l* u
    // called <foo>". You can send a message To a particular1 `; s. n, I0 @0 m" D6 n
    // object, or ForEach object in a collection.4 E% o0 J2 L6 q3 R% o: c, v9 d
        
* {$ v% c6 o  m( a8 @    // Note we update the heatspace in two phases: first run
/ M5 a6 k5 V9 D+ A9 O    // diffusion, then run "updateWorld" to actually enact the1 [( d, k0 @  Q" W. ^
    // changes the heatbugs have made. The ordering here is
( a, T6 ]  k: |4 k    // significant!
7 Z$ M/ O$ _  M        & m; d; j0 S: j9 q
    // Note also, that with the additional: Q' [' O0 t1 x1 ]& ]
    // `randomizeHeatbugUpdateOrder' Boolean flag we can5 C7 q1 u& G6 {; R! E7 j
    // randomize the order in which the bugs actually run1 Q+ s; t7 q2 |. R4 T
    // their step rule.  This has the effect of removing any
7 n/ @7 ~2 [1 T2 |7 H% H    // systematic bias in the iteration throught the heatbug
# u+ F9 P% g9 ^* ~( Y6 [+ @1 I& M    // list from timestep to timestep/ c4 p4 q/ h, I0 e
        
! s9 J- F4 S& {    // By default, all `createActionForEach' modelActions have
$ |/ ?' p, o& h; A    // a default order of `Sequential', which means that the
; N# t% v  u0 m. a; N+ Z3 S    // order of iteration through the `heatbugList' will be; _( M! {0 ]$ c2 O, d( m. n0 ?
    // identical (assuming the list order is not changed2 T. U$ E" V; V; d
    // indirectly by some other process).
* v8 h& R) W- k6 w! d" U   
6 ?/ s+ a7 H; {% w7 \% \    modelActions = new ActionGroupImpl (getZone ());
7 m. ]: j, ^/ n) x& r5 G; F1 P# }- ^% [+ D- }
    try {( r* a, F! }1 q  j7 R
      modelActions.createActionTo$message
7 {6 z9 |0 a% R! O# P5 P        (heat, new Selector (heat.getClass (), "stepRule", false));
! ~) T$ a4 k  n, z    } catch (Exception e) {
3 V0 J2 G( m" A1 G/ q* \% ]8 c      System.err.println ("Exception stepRule: " + e.getMessage ());
* w( N# u* Z, A1 ]5 T! c! e& w6 u    }; C3 s* P1 k( Z- E2 M! C6 U! I$ M
) r# }( d4 e: a1 c
    try {6 L8 p+ m! f% x! j
      Heatbug proto = (Heatbug) heatbugList.get (0);
" `4 }7 L' o% V: E8 S( V# w      Selector sel = 4 U) w& D% P" N0 v. H# T
        new Selector (proto.getClass (), "heatbugStep", false);
  N( m5 @: [; p      actionForEach =  h# }; m1 P0 |$ ?. H% N! U% c
        modelActions.createFActionForEachHomogeneous$call
! K5 Y6 E" O* j3 E3 s4 k& g' x        (heatbugList,
2 _1 |: W% F, @4 o- D# a2 J* ]( p# R         new FCallImpl (this, proto, sel,# Z# `( s8 H: G5 m6 f. p7 d7 E
                        new FArgumentsImpl (this, sel)));5 l; y0 q6 G1 @" i4 [9 }) R
    } catch (Exception e) {
9 |! w" `! _: g6 R! z: D3 S      e.printStackTrace (System.err);
  i. P3 F: d) a    }' v9 u: }1 C3 s# M4 D1 S0 g* ~+ B
   
. a# n1 d! x/ B' U- G, V    syncUpdateOrder ();
9 W" C+ j" K/ C: ?4 ?+ X" d* R) z) ^
    try {3 Q" \/ j3 n8 V. v+ I. p
      modelActions.createActionTo$message
3 W* g! n2 Z1 y  l8 Q3 m        (heat, new Selector (heat.getClass (), "updateLattice", false));/ a. |. a6 M. P% F
    } catch (Exception e) {: E7 I2 {. X6 @. t; Z; {
      System.err.println("Exception updateLattice: " + e.getMessage ());# p& R+ f5 o8 L6 J( U4 a6 h
    }
# ?: \6 m( n' ~# M3 u: {) ~        
+ U3 W& {; o  Y    // Then we create a schedule that executes the5 V( m% S; L1 D4 @
    // modelActions. modelActions is an ActionGroup, by itself it
7 M' Y7 U: U  X    // has no notion of time. In order to have it executed in
0 A1 X/ w, _' U/ p/ Z$ x    // time, we create a Schedule that says to use the, a# q1 V6 }/ m  o
    // modelActions ActionGroup at particular times.  This  q+ z# c- \. `5 X7 R5 z
    // schedule has a repeat interval of 1, it will loop every* a$ a  D# M+ Y( p( [0 \. \
    // time step.  The action is executed at time 0 relative to
6 G7 r$ K4 S) y; l    // the beginning of the loop.
+ u9 I9 s5 B0 [2 l0 z" ]  E1 a' h
    // This is a simple schedule, with only one action that is4 j- ~* [& g" N
    // just repeated every time. See jmousetrap for more
8 T8 F3 V& S. I* k    // complicated schedules.' b2 w6 B3 F  k0 j/ y; w% C3 ^3 G* f
  
3 U! t! D7 h3 P7 E$ b5 [5 Y    modelSchedule = new ScheduleImpl (getZone (), 1);
' Q! H- Q3 G' w    modelSchedule.at$createAction (0, modelActions);6 L, S1 t3 Y9 T
        
$ V0 e( g5 K/ P2 k; _    return this;4 C1 ?+ |5 p) Q% ?
  }
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