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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:
4 g4 a! R* V9 J  B% C, @8 }( N9 D% o) m6 F# k% N2 s& a0 Q
public Object buildActions () {
, G: A2 F; ~2 H* |$ F3 i    super.buildActions();
: c2 v! D; {0 d3 r   
3 ~6 T8 \7 _0 I3 W    // Create the list of simulation actions. We put these in
) B) d8 u8 q/ C    // an action group, because we want these actions to be
* `( p' T1 L, Y# ?( @1 U# D/ p    // executed in a specific order, but these steps should; ?* `; N$ T' P6 Y% C2 q
    // take no (simulated) time. The M(foo) means "The message
9 M- [" `/ @6 m* N  k) Q    // called <foo>". You can send a message To a particular" ~: k0 l# S5 u8 J" r' J, V& j/ _
    // object, or ForEach object in a collection.  D/ d( R$ C. T# g( w- Y
        
' l8 O; z4 t+ v7 p' {2 o3 {    // Note we update the heatspace in two phases: first run- ?2 N5 q* i8 j& L
    // diffusion, then run "updateWorld" to actually enact the
' z- H) S/ I# H5 Z    // changes the heatbugs have made. The ordering here is. A4 p2 M8 t& V; \/ V5 o2 f7 q* g! @
    // significant!
' ^5 q& C; ]: ~. u2 L7 f        
* x7 X" ~1 u! q. v* C/ d$ L3 ]    // Note also, that with the additional
& q5 {1 C- U: W9 l! v0 `; ]4 Y% J    // `randomizeHeatbugUpdateOrder' Boolean flag we can
8 B. ~+ `; U/ x9 [/ ?    // randomize the order in which the bugs actually run
1 l# x& ~0 M! Y  L! v% M/ a4 w+ O  c    // their step rule.  This has the effect of removing any
% h: o- n( b& K) Y    // systematic bias in the iteration throught the heatbug7 I$ w* y! C, b
    // list from timestep to timestep8 s  k* L; ]/ E! f5 J' Q2 ?" a
        / f. V$ I  M2 L  l+ k+ e1 q
    // By default, all `createActionForEach' modelActions have
4 _5 r' K7 s- q* ~- ?7 D    // a default order of `Sequential', which means that the2 R. \( Z' m! i; k, D
    // order of iteration through the `heatbugList' will be3 }) s- C6 I0 h. Y) j+ V& G
    // identical (assuming the list order is not changed. P! u& }0 U7 L9 \( a( ]
    // indirectly by some other process).
5 d/ @, e3 `; S$ _    - h3 D7 H1 ~# k# c( P3 B
    modelActions = new ActionGroupImpl (getZone ());7 U0 ~/ Z, F$ g6 U

, n# F# Z3 A# [7 q$ k9 J    try {" o* U& ^8 f; Q9 w0 l) U
      modelActions.createActionTo$message
% Z; R' L& j9 e, M' o. `- x8 X+ F        (heat, new Selector (heat.getClass (), "stepRule", false));
$ |, k: W! u  r+ r- h    } catch (Exception e) {
' K  T+ V4 J& z) y      System.err.println ("Exception stepRule: " + e.getMessage ());! h# D& o- m; J' O& t- k
    }) R3 Z/ d2 p9 R
* E2 U- E- ?8 o
    try {
- m5 B5 O; f4 ]6 ]$ R& Y      Heatbug proto = (Heatbug) heatbugList.get (0);
6 T: d' D3 N. B% P: ]3 `) ^      Selector sel =
& s% Q- N2 L; V        new Selector (proto.getClass (), "heatbugStep", false);
+ T6 i. Q6 P! Q. v( l6 V* f      actionForEach =, ^- g: y  L  |$ i% c* o
        modelActions.createFActionForEachHomogeneous$call
" ?) D$ O5 ?1 D9 v        (heatbugList,
+ x! M$ D* k! e; c         new FCallImpl (this, proto, sel,( p2 O. R1 C' Q
                        new FArgumentsImpl (this, sel)));
+ \8 t/ A- K6 C8 ]    } catch (Exception e) {' L  L2 f" D& d2 o( h
      e.printStackTrace (System.err);1 c, e% q& ?8 P4 `/ @
    }! n& f( X  j1 U1 S
   
* u2 @+ \8 x, i( r    syncUpdateOrder ();6 B/ a: s* I( Q6 p1 z% F& g/ z

. c# U4 F/ D# M    try {
* o9 p; ~0 z: M! f* N      modelActions.createActionTo$message
1 _9 N" `% P+ [% ]- a        (heat, new Selector (heat.getClass (), "updateLattice", false));* G5 g) t% w2 q# K
    } catch (Exception e) {* o2 }. y' v" I  ~2 A! y  Y$ Y
      System.err.println("Exception updateLattice: " + e.getMessage ());2 N0 m9 g5 a/ i) g+ z8 S
    }
0 T& Z7 h- M! B        
4 D# X& B- b. d0 c0 m    // Then we create a schedule that executes the- s7 A, l9 F8 E- h
    // modelActions. modelActions is an ActionGroup, by itself it, u' P. |0 E8 |" C: J, M1 t# w
    // has no notion of time. In order to have it executed in
2 w7 n3 @0 V, v7 s$ }( }0 O8 E1 l    // time, we create a Schedule that says to use the
2 q! H, j3 f% Z$ |    // modelActions ActionGroup at particular times.  This
' r/ f9 B0 t/ L1 L$ [$ u2 U# j    // schedule has a repeat interval of 1, it will loop every
* o, X5 t+ c# v    // time step.  The action is executed at time 0 relative to: i; B6 q+ k' G( t- \
    // the beginning of the loop.
5 t! N% U+ i! y: H' l- P
9 K; u, m+ t- X- [, S    // This is a simple schedule, with only one action that is
+ [. ^5 C9 w) w5 d% c    // just repeated every time. See jmousetrap for more
2 a5 W0 w8 F+ f' @; X8 }    // complicated schedules.
7 ^0 R$ {2 h  ^  X: m0 a) X# n  9 |  U+ F+ F# i
    modelSchedule = new ScheduleImpl (getZone (), 1);; i. O) _" K5 v) v  @3 P" h$ }# Q
    modelSchedule.at$createAction (0, modelActions);* f& A) r- W, w2 y
          u1 w9 Q0 G' I+ o0 Z; j/ w! k* r
    return this;
' Q# f$ o, O) d- o3 U! A- j1 [  }
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