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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:
& \' U' ]+ j" t1 U1 b1 L  i/ a& D
# u/ |' w3 `7 Y9 H) J public Object buildActions () {
+ F5 o* S) H  J7 x7 p    super.buildActions();
8 q' U, n6 t1 a: s7 G+ O  o1 k    3 {  v% V0 {( h) e
    // Create the list of simulation actions. We put these in
$ p- m( L8 u: G3 {* J    // an action group, because we want these actions to be
8 r3 W, ]* g5 _& u' C    // executed in a specific order, but these steps should. v; k% O) ]$ {' M
    // take no (simulated) time. The M(foo) means "The message
' e8 K4 }- @4 l4 F) R! h    // called <foo>". You can send a message To a particular& U  e7 \8 @9 M' Q6 A0 h
    // object, or ForEach object in a collection.
8 _. G( Q% Q9 H3 r& T* Z3 K        
1 q) V( _& x% E/ D7 r6 S    // Note we update the heatspace in two phases: first run( Y) _2 q' I  e! @5 |  r1 ~
    // diffusion, then run "updateWorld" to actually enact the7 U3 }. ~- l3 V- W* C3 F& W  c
    // changes the heatbugs have made. The ordering here is
1 o4 {/ s$ {+ ^    // significant!
/ m6 @% L" a9 L4 g2 ~! P        
5 A& s" L1 h) k1 N    // Note also, that with the additional
' S5 U9 i6 V; E, L) d    // `randomizeHeatbugUpdateOrder' Boolean flag we can
2 K3 F+ k, I; g! I/ h4 H5 f    // randomize the order in which the bugs actually run8 ~5 V9 a5 y6 T. C5 b
    // their step rule.  This has the effect of removing any! Z0 v, ~) k$ T4 B2 I. E3 M
    // systematic bias in the iteration throught the heatbug& Z" M3 }* e+ S8 t4 R
    // list from timestep to timestep. I  ?# J) {- Q2 l6 u; H# k
        
9 S9 J' ~9 {9 m    // By default, all `createActionForEach' modelActions have
! L+ N2 |0 s/ F1 N9 b7 u6 I  F* {    // a default order of `Sequential', which means that the
. K" f2 g2 M# x% ?# D: l( r    // order of iteration through the `heatbugList' will be
& b, K+ E( C" z! p& }& t$ e    // identical (assuming the list order is not changed" I9 [6 q9 k8 n1 E" a7 R- x0 L
    // indirectly by some other process).- R1 ~4 _$ q4 s9 B- v6 \: i( n
   
. U$ v" W: ~! A  M" j: x    modelActions = new ActionGroupImpl (getZone ());
. w) D- f$ O$ f/ d, C: [% P0 Z2 h, x/ v' L; ^$ E# \# p% Q$ l4 M% z
    try {
# l5 J) L8 ~' f. O+ b      modelActions.createActionTo$message
  Y2 N" l2 j5 n9 h        (heat, new Selector (heat.getClass (), "stepRule", false));
+ L& a7 A. @6 s& F. b; t, l. U! i    } catch (Exception e) {
, X0 s  T/ S, H8 b- w7 G* p4 u      System.err.println ("Exception stepRule: " + e.getMessage ());
! l, s* K# c2 e) ~    }
& k1 \$ [7 G3 A
( r* N- Z  `3 u# p" o    try {
) f8 R- T' a3 p3 D) U      Heatbug proto = (Heatbug) heatbugList.get (0);- @, W) s1 H2 V2 e' T1 G/ S. l
      Selector sel = . q4 Q0 ?- u! B. ~3 m
        new Selector (proto.getClass (), "heatbugStep", false);/ y* F" G$ T5 q9 d- u/ d: c
      actionForEach =
" c. X; U0 L1 Y. T% L% j        modelActions.createFActionForEachHomogeneous$call: z2 k/ |$ V' \
        (heatbugList,
4 D' M, k+ a" R5 I7 h7 g         new FCallImpl (this, proto, sel,
$ x! Q4 u6 {$ P7 m  ], S; M                        new FArgumentsImpl (this, sel)));
1 _8 H5 y4 @, P8 T# \4 `    } catch (Exception e) {
& s& O& Q( K7 I/ J* j, U2 L* L# k9 }      e.printStackTrace (System.err);7 e, J: S9 Z6 ^: }' M  W
    }, V0 h& g! L7 h6 `
   
' B5 T8 Y- Y2 d1 F    syncUpdateOrder ();
8 Q1 N8 P& N, ^! `8 \# N! o$ F& R& s, d2 C
    try {
' D& m; I/ O+ `  r$ x; d& M8 n      modelActions.createActionTo$message
* y0 a: z) W, `* M5 K8 H- \        (heat, new Selector (heat.getClass (), "updateLattice", false));: C* H4 n3 y8 V4 q3 y  K7 z# U
    } catch (Exception e) {* u4 {, V/ W- {$ g7 \5 n, k' d$ J/ |
      System.err.println("Exception updateLattice: " + e.getMessage ());5 N2 o% H2 O' s2 ^1 b. K' }
    }
: {' `- r: P* ^  H% j        
: }; X8 M  {1 _! W2 |8 r0 v6 `    // Then we create a schedule that executes the
7 m$ x' L, R0 ~* S& S' c    // modelActions. modelActions is an ActionGroup, by itself it) `% p" k  R3 q! o0 R. m
    // has no notion of time. In order to have it executed in
$ f3 A# M) T2 K% l; }    // time, we create a Schedule that says to use the
, Z% J% i) h- n9 w( l( s    // modelActions ActionGroup at particular times.  This& t$ \4 n/ n7 f2 Z+ N9 ?% t
    // schedule has a repeat interval of 1, it will loop every' z: H7 t: x- k* _8 @/ r1 i
    // time step.  The action is executed at time 0 relative to9 B! m+ V) R# g$ E; V+ a
    // the beginning of the loop.
$ l- y5 D  |' a% Z
4 {& F& S9 `  B% Y" ?7 H, Z    // This is a simple schedule, with only one action that is
! k# v8 N! l  }7 s1 v% g    // just repeated every time. See jmousetrap for more
. Q0 C. P6 r) q8 B    // complicated schedules.
+ [4 W; K( ~) k# _) J0 F  
) ^; A0 p7 H- X& N( Y    modelSchedule = new ScheduleImpl (getZone (), 1);
( C3 \1 i- [$ v    modelSchedule.at$createAction (0, modelActions);
- z$ f- w1 ?7 K# k, a& y        
9 O, M7 j8 ^8 u7 R9 S3 Z    return this;
: J/ \# x$ [0 L% {  }
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