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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:
  w% G* e& b! t( {% I4 L4 L5 {
+ O  J: B9 n& e public Object buildActions () {! v3 @  u" J3 o5 r
    super.buildActions();; q& p  O# q( X# H3 d0 c5 Q
   
5 C& ~( I: C; k! B/ g1 ?* W, s    // Create the list of simulation actions. We put these in: ]! s" r0 T$ e5 L6 X
    // an action group, because we want these actions to be+ T" F; O  E/ e
    // executed in a specific order, but these steps should
( T7 M+ m% V. P) [* }' {    // take no (simulated) time. The M(foo) means "The message
* l- o( m, h/ Z# Y    // called <foo>". You can send a message To a particular! d: ?2 c7 E/ ~1 a! P0 ^$ d# k5 Z
    // object, or ForEach object in a collection.
( r: ^* g/ \  s- t        ' H) p  r9 ]: W4 O  g1 M5 K- U
    // Note we update the heatspace in two phases: first run
( x- F( q! l, R0 x& V7 T    // diffusion, then run "updateWorld" to actually enact the8 m* h, W( Y0 q# v
    // changes the heatbugs have made. The ordering here is
# \& s4 k' v8 F0 N; |2 |" t    // significant!* b+ I- h( d* }5 B/ k) F3 E
        
; u  E5 _  h* H' @6 v4 |4 N$ h7 w    // Note also, that with the additional: ]' V! T( e$ G' R! S% b: ~; }
    // `randomizeHeatbugUpdateOrder' Boolean flag we can. |0 C5 O0 ?! r. q8 ?5 i4 ~# ^- k
    // randomize the order in which the bugs actually run+ I0 U- f6 s) I
    // their step rule.  This has the effect of removing any( N+ E9 x. L4 c% P3 @" Q
    // systematic bias in the iteration throught the heatbug
0 v7 r' o& f! |% y" U$ W5 B3 m$ i7 N' T    // list from timestep to timestep
3 e' P) C% i1 ^2 ]0 X5 F4 ^        
6 o4 t- ^& c& }5 @- B; M8 ^    // By default, all `createActionForEach' modelActions have
# `9 [; F! t) ~+ w0 E    // a default order of `Sequential', which means that the
; R( s3 m5 l! E6 k4 j& m    // order of iteration through the `heatbugList' will be
1 n; |" ?9 r2 \" b0 d7 p6 |$ J    // identical (assuming the list order is not changed
5 D0 b$ |' \4 @+ _    // indirectly by some other process).6 a! u$ x4 t! P/ J$ m
   
1 ~  m: ^  D6 l5 h( ~3 F& ?' ?    modelActions = new ActionGroupImpl (getZone ());0 g1 z. a8 u" |6 m/ }+ Q, h

1 ?/ n# V* a' ^: M5 t; D    try {
! ]2 [' @/ W, e% i' k; U      modelActions.createActionTo$message4 W8 h8 |( n+ D; k, O
        (heat, new Selector (heat.getClass (), "stepRule", false));. ~" A" Q/ ]: t) T! z6 Q1 e
    } catch (Exception e) {  d( s! A" [( y) D
      System.err.println ("Exception stepRule: " + e.getMessage ());
" k9 S- S1 t7 d6 e+ u. L- q# n    }
4 w* y2 w7 ?% b3 H' z0 `% e9 R
5 G! o% X; z( U2 V) |$ [    try {
5 W8 B: s  H8 d( L0 p& o! l      Heatbug proto = (Heatbug) heatbugList.get (0);; U/ g8 {$ x( F" S9 E$ L* T) l
      Selector sel =
; e6 ^( K( P6 e- F% e- V9 S        new Selector (proto.getClass (), "heatbugStep", false);
0 w9 O" [8 N/ m1 A9 r* {; ~6 [      actionForEach =
$ p. g. `' u; r        modelActions.createFActionForEachHomogeneous$call
* O$ i1 y4 F  M- [9 z        (heatbugList,( D% @7 ?5 d3 v& l3 ~2 H, G
         new FCallImpl (this, proto, sel,
; l% J* ^/ r. _& g                        new FArgumentsImpl (this, sel)));  `' J) t$ Z# b
    } catch (Exception e) {# `/ i* ]! }! b2 q. n0 B' k
      e.printStackTrace (System.err);$ T* u* D' g2 C2 X
    }, A1 |+ o" |$ [+ n/ L
    5 U$ Q8 Y- R1 l" c& Z" x( O
    syncUpdateOrder ();+ D0 p" U7 n; ~8 \* p5 O
2 {' V7 A% t" y
    try {; ?- K; @7 L# ~5 t
      modelActions.createActionTo$message
, u% n1 k: f/ d/ y( _1 w6 S        (heat, new Selector (heat.getClass (), "updateLattice", false));4 j/ [3 e. a4 z/ x* b9 ^/ H
    } catch (Exception e) {% \! Y. s5 N0 w' D7 _! R" U- g6 o
      System.err.println("Exception updateLattice: " + e.getMessage ());
- a* _7 D; D3 g! u7 y( H    }
2 i8 O2 W2 \& l        
+ y7 l( c! V: l    // Then we create a schedule that executes the
/ ~* {0 j2 B& k0 H7 h+ A1 t. x    // modelActions. modelActions is an ActionGroup, by itself it1 E$ w; @* t# c3 c1 J4 w
    // has no notion of time. In order to have it executed in& B0 z8 K" i. k+ z
    // time, we create a Schedule that says to use the
. F( v3 j6 g* D0 T, ?; Z$ C5 A    // modelActions ActionGroup at particular times.  This
. F. M. F6 k, u# Q6 K: h5 g0 t    // schedule has a repeat interval of 1, it will loop every) k  y: D: Z8 k2 V. ^, _$ v6 f
    // time step.  The action is executed at time 0 relative to( F# ]: [5 b9 u6 f3 q8 u9 M
    // the beginning of the loop.
$ l' p; H2 M+ S) z" K. @: U
. f: b' b" d" G+ J: [0 w9 ^    // This is a simple schedule, with only one action that is. Z1 a7 e$ [3 W
    // just repeated every time. See jmousetrap for more) F+ I/ Z9 ~5 y3 B7 P
    // complicated schedules.3 }8 r- Y- Q8 Q# j* L4 [' E4 _
  & [; `& h& _% I; l5 M
    modelSchedule = new ScheduleImpl (getZone (), 1);
. L3 B$ \& T& W4 P, z& J7 r) i    modelSchedule.at$createAction (0, modelActions);
8 T$ c( r" M. m" Q( L        
2 i6 z' c0 h6 w6 n    return this;: l$ x9 O- u" S9 x5 x
  }
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