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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: m$ q' N. f$ V* o, I
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public Object buildActions () {# _& Z2 I- [0 y
    super.buildActions();
% ]7 T9 o9 P/ Z  Y& M8 z  q   
- E1 H: X4 m1 `/ s7 I9 S) ~" N    // Create the list of simulation actions. We put these in6 U7 I8 t+ E1 E" s: ]
    // an action group, because we want these actions to be. N. F8 c* q9 T: Q! S) ^) U, I
    // executed in a specific order, but these steps should
( `! n( E) j/ z9 \    // take no (simulated) time. The M(foo) means "The message/ o2 G1 z; C6 S7 u  A" V
    // called <foo>". You can send a message To a particular& I) H  q: B8 s# I$ c6 Q+ l3 M
    // object, or ForEach object in a collection.
- F% J4 E. T+ X! O        
8 p/ ]7 Z. T0 \/ W! F    // Note we update the heatspace in two phases: first run
2 ^7 Y: x+ B" B  z* H/ c    // diffusion, then run "updateWorld" to actually enact the  J5 @) l3 Q9 {' e8 ?& L
    // changes the heatbugs have made. The ordering here is
1 d8 [* `3 s! R; X+ |+ i: L/ w    // significant!
" L: y- E$ @4 s% ?        
8 C! d5 F5 T/ @9 |# e! l# z: w    // Note also, that with the additional* M, }8 u4 d- k# A+ a0 Q% k
    // `randomizeHeatbugUpdateOrder' Boolean flag we can% ?! b! P% N/ D% Z
    // randomize the order in which the bugs actually run
, v$ j% v* T+ T' Z. [, m/ [# G0 c    // their step rule.  This has the effect of removing any
7 I1 U; m2 l3 @    // systematic bias in the iteration throught the heatbug* _, C% m: ~% N* H
    // list from timestep to timestep
5 t$ `& O7 l4 r9 n" N" g, a! T        
: S5 @7 j  J5 F. `9 j    // By default, all `createActionForEach' modelActions have
7 A% K0 B4 c  L9 j; H    // a default order of `Sequential', which means that the; N( y/ p: [: [9 W  _
    // order of iteration through the `heatbugList' will be8 E7 i: a. U* U! P3 S2 W
    // identical (assuming the list order is not changed( g/ _$ C# @) a4 i* e' v1 n" M
    // indirectly by some other process).5 v6 @$ n7 i; m8 ~+ a8 ]
    2 ^' m. q, l9 Y- D1 k  b6 Y/ f& @
    modelActions = new ActionGroupImpl (getZone ());- i; O$ `2 H& `2 d! j' T* v
) ?7 z8 |) ~9 k5 }/ \
    try {
6 |# X+ R# ?; B2 Z1 l/ C      modelActions.createActionTo$message$ D/ j4 T+ r" z" m. v' P
        (heat, new Selector (heat.getClass (), "stepRule", false));
8 n- S; B+ d- P$ q* Y    } catch (Exception e) {
9 L6 y4 v+ r: [9 n' @      System.err.println ("Exception stepRule: " + e.getMessage ());
2 \' x$ R* H+ c; {- z$ Z    }3 z. u: Z; }% V' M' ]

3 N, {1 ?, o; v8 [    try {4 ^- V  D3 U( S& o% A) o$ ~
      Heatbug proto = (Heatbug) heatbugList.get (0);
$ y5 h& m4 T* a2 l2 F2 E! |9 ?; v0 Z      Selector sel =
/ ~8 n, y! N& x        new Selector (proto.getClass (), "heatbugStep", false);
5 a% b! b  T. S/ f! a; H      actionForEach =
) l7 h& |. C. R% R9 _6 P( K        modelActions.createFActionForEachHomogeneous$call! {  o# o; Y9 u, |5 e7 @
        (heatbugList,
5 b0 s* k5 h- _. H         new FCallImpl (this, proto, sel,
- c3 b- g2 N- |                        new FArgumentsImpl (this, sel)));1 w) B6 b7 r" c/ x& J* @8 q! q
    } catch (Exception e) {
5 B' n) @( x1 A  I! i, ^      e.printStackTrace (System.err);  k& }4 d, u: k  Y" e
    }
+ X2 |2 D, ?; x3 y   
0 N1 X; W! o; N2 c    syncUpdateOrder ();' w/ N* ~  u% S2 G0 c
/ t0 R: \* z& d/ `& l* D+ x
    try {
) |9 h# ~9 O) Z, t      modelActions.createActionTo$message " F3 I! w5 _# V/ U( w8 R9 z  ^, s2 }
        (heat, new Selector (heat.getClass (), "updateLattice", false));
1 O9 o& u2 M( H' b    } catch (Exception e) {
$ F( t- J, k4 i1 \0 t      System.err.println("Exception updateLattice: " + e.getMessage ());
8 ]1 U, s, p# o9 j. j, U9 p4 f    }
+ S! \% `) E7 ~8 B* n. s9 Y        
3 ?. H+ R$ l& X; q: p    // Then we create a schedule that executes the
* p. I  v/ G2 x1 {! \    // modelActions. modelActions is an ActionGroup, by itself it' G( ]/ j' Q4 m1 s: u" i
    // has no notion of time. In order to have it executed in! t2 U" G$ w8 P' W
    // time, we create a Schedule that says to use the% B' `- g3 G3 d( W0 i# z
    // modelActions ActionGroup at particular times.  This
  e: v1 |) E! p; t" g    // schedule has a repeat interval of 1, it will loop every: `' E6 T# I, V5 O% B
    // time step.  The action is executed at time 0 relative to: i4 y1 F* y/ R, P8 f$ `2 _7 q( v
    // the beginning of the loop.- p+ W/ U& t, T. c' s& V

" E( J- Z, y$ H# @    // This is a simple schedule, with only one action that is% n1 s+ O- h* `
    // just repeated every time. See jmousetrap for more
: X: v/ r2 t0 O6 k! d0 D    // complicated schedules.- O& |. ~- L6 e/ u
  % B  i2 [* {- X0 @
    modelSchedule = new ScheduleImpl (getZone (), 1);& N% Z" T) p6 A
    modelSchedule.at$createAction (0, modelActions);. L- \; b+ ~: F
        
0 ]$ G/ @$ O  F( L- s9 f    return this;
* C3 G( F( K+ |7 v6 w# f2 Z  }
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