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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:6 r# a2 n' [% p% F, ]6 c
$ d) B1 O1 S, i1 s; V' Q
public Object buildActions () {  r2 U8 a* }$ S) d
    super.buildActions();; j. s$ N) L; Z7 F' O7 H% N
   
6 V/ f( d8 ^/ f9 I. @, x; e5 r9 x    // Create the list of simulation actions. We put these in
3 B" j9 b4 v7 |( i% n' |7 s    // an action group, because we want these actions to be" q5 G  s$ q, L! y* r8 ~
    // executed in a specific order, but these steps should
  [7 f: z' R; R, Y$ j9 A    // take no (simulated) time. The M(foo) means "The message1 @0 K( T6 P9 b9 ^  `# ]
    // called <foo>". You can send a message To a particular. X$ w6 L8 p5 Z/ d9 v8 Y5 ~
    // object, or ForEach object in a collection.3 F$ |- k' P5 L0 U& ]7 Y2 P
        3 t$ c! i  z, L  g3 _( S  S  ~
    // Note we update the heatspace in two phases: first run2 S, h4 n+ p% y  [! G) Y
    // diffusion, then run "updateWorld" to actually enact the
5 h' s+ W- r5 }( m1 b    // changes the heatbugs have made. The ordering here is! W( X3 a; s/ W. O7 l& ^- s
    // significant!
" H. X" E4 r. g' r) }6 M# J        
: V( L: `( e4 u$ s" h7 F    // Note also, that with the additional
) }! i8 Z) W( ?3 v. p1 W* J% ~    // `randomizeHeatbugUpdateOrder' Boolean flag we can
% p0 z6 X3 B* r) G# n0 C& q$ L    // randomize the order in which the bugs actually run
  \( E# l5 Z; ~! A7 u    // their step rule.  This has the effect of removing any
$ m  \: U6 F% J+ J    // systematic bias in the iteration throught the heatbug$ D9 p& Q7 c' z0 W
    // list from timestep to timestep
  a) L, T& A+ r$ j5 B        
7 N) o: H3 z6 G0 Z, s0 c& k    // By default, all `createActionForEach' modelActions have
) t9 G  o* U; T* G+ T; M- Y    // a default order of `Sequential', which means that the
9 y* G. @% |: X) U    // order of iteration through the `heatbugList' will be5 x2 U2 h( I- d( U3 d& d
    // identical (assuming the list order is not changed% b' j9 X+ j. [; R
    // indirectly by some other process).
! w; k" {( v0 T+ T% m, ^   
* \1 y; @; x& }+ n  V    modelActions = new ActionGroupImpl (getZone ());- m* v) \; o8 M3 g* Z7 |( x+ G

  c5 c- z. K2 j) I1 t/ ?: X& n# d    try {3 Y/ g/ i! g+ t1 |7 c
      modelActions.createActionTo$message: @9 j$ B% H9 y* F( N- q% g' j
        (heat, new Selector (heat.getClass (), "stepRule", false));
) F3 j, d1 j# X& r0 o    } catch (Exception e) {
5 g2 F5 K/ }: q      System.err.println ("Exception stepRule: " + e.getMessage ());6 n. i. f0 e# y
    }1 K" f+ \8 x+ Q' y8 W

5 |% |" I' {5 n( r% C    try {
; x7 C8 k7 Y/ c      Heatbug proto = (Heatbug) heatbugList.get (0);
* z; A) z& X/ ^$ e0 \      Selector sel =
. t5 b/ m1 {1 [        new Selector (proto.getClass (), "heatbugStep", false);
* o8 X6 D; D& }8 |9 H" V      actionForEach =$ P! P, _! D; U0 V% `4 c4 Y% a/ G
        modelActions.createFActionForEachHomogeneous$call
$ K9 E. x" M3 j* {; p9 @: G        (heatbugList,
$ h- J9 O* }8 d         new FCallImpl (this, proto, sel,
6 L4 e0 D3 p2 I, i1 E8 b* R                        new FArgumentsImpl (this, sel)));
" t: q. t! r9 ?    } catch (Exception e) {
$ e* h$ G- E  {; `- o3 f- b      e.printStackTrace (System.err);7 Z$ y. }- {5 Q2 ^; b
    }
; U9 L% K" ?* j$ d/ q5 ^      V" G$ M* P4 S; }. A9 T0 ~
    syncUpdateOrder ();
3 j& O6 V- ~8 M' N$ \( x) V) `4 U, z( b; ]& D0 s
    try {
& n+ |2 k* q: x. Q      modelActions.createActionTo$message
# U7 p$ F# l; Z" Y1 t        (heat, new Selector (heat.getClass (), "updateLattice", false));5 `3 a) m! q/ ?3 r" }8 U
    } catch (Exception e) {6 T4 c. D% N6 N9 Z
      System.err.println("Exception updateLattice: " + e.getMessage ());
( o6 z2 n( X4 L3 {. }    }; \4 T8 {& L* O% L
        
. ]5 g! s$ r5 c4 F    // Then we create a schedule that executes the
" L. a' C! j! a. G    // modelActions. modelActions is an ActionGroup, by itself it8 s6 h3 z6 f0 M) M3 i
    // has no notion of time. In order to have it executed in+ _! l7 E4 s8 c) t
    // time, we create a Schedule that says to use the; g1 [! w4 h3 _" Q: H! n
    // modelActions ActionGroup at particular times.  This. J) b" g& U( J  ~  J3 o  u- t# b9 o
    // schedule has a repeat interval of 1, it will loop every* L# L. n7 f8 V) {0 E3 j* M
    // time step.  The action is executed at time 0 relative to( Y- `" j: {, k8 J
    // the beginning of the loop.
# A: R% B) R" E8 H
/ b' W3 S# ~# k" V3 }    // This is a simple schedule, with only one action that is
0 T$ P* e4 _  z# U( A+ c  d& f    // just repeated every time. See jmousetrap for more% z! E, E/ j" B4 q* F
    // complicated schedules.
( Y, R  t. g  k+ t% q  
/ o/ W% ], ~; F+ v3 t; l    modelSchedule = new ScheduleImpl (getZone (), 1);9 J* f: s1 X# P( K% ?$ o; Q
    modelSchedule.at$createAction (0, modelActions);
7 ~' a& _+ W) d6 A: m        
5 G8 l5 F5 ]# h    return this;! ~# ?& p6 U( y! ~: K; ?
  }
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