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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:: l& E2 ?1 X3 W, u+ N. F2 L$ h/ K

$ y7 t6 X7 I. Q  \- t* W. m public Object buildActions () {
$ x3 j9 d8 ^8 l  B$ K    super.buildActions();
; [/ v" o- @0 Z/ ]    / A  j* x; s! p/ h( s
    // Create the list of simulation actions. We put these in
0 {7 N0 ?3 C5 L5 [: A    // an action group, because we want these actions to be
9 Z- F1 C! Y1 G. o( j3 E3 X    // executed in a specific order, but these steps should
$ d* s& |- |3 G" D    // take no (simulated) time. The M(foo) means "The message
5 T4 B* F2 f$ f4 Q& ]& w8 L    // called <foo>". You can send a message To a particular
4 Z4 ?' `3 p% Q( w: L" q    // object, or ForEach object in a collection.1 U* D# t" {( E% I- t# P8 u5 ]
        
8 p' B1 L0 r$ f  k    // Note we update the heatspace in two phases: first run
2 s- U3 b* |& V. i/ h% D& g/ U    // diffusion, then run "updateWorld" to actually enact the( N. h6 p+ Z  ]
    // changes the heatbugs have made. The ordering here is* A! g5 M8 Z/ @5 d% ?4 j  X- N
    // significant!: S$ a! H- e1 m
        & y$ o- Z) X/ {" E1 s. S
    // Note also, that with the additional
1 `) L1 ^8 m/ S    // `randomizeHeatbugUpdateOrder' Boolean flag we can
# A' |& C! }* `. q  Z1 k7 z    // randomize the order in which the bugs actually run
3 m# }  H: P; z6 f  j    // their step rule.  This has the effect of removing any
) e* d- i  c0 e/ T    // systematic bias in the iteration throught the heatbug
  k" w& j- Y9 U    // list from timestep to timestep
+ _9 p( B7 j- A9 m9 l        
, r  [) b5 T- M8 b2 n2 r" D9 h    // By default, all `createActionForEach' modelActions have: V7 m1 F6 c' }4 S$ k1 j1 M6 D+ J
    // a default order of `Sequential', which means that the
6 W' y7 L0 u- M6 q    // order of iteration through the `heatbugList' will be& Y; B* H( O, x1 t
    // identical (assuming the list order is not changed' }; Y4 y9 K. T! N$ q/ T
    // indirectly by some other process).9 r# E2 P- U; Z3 o/ ^" Y
   
, o9 x- J4 \' x  j! g    modelActions = new ActionGroupImpl (getZone ());
( B4 b$ H& c. O( R7 P
4 e4 \+ Z& R* k/ J8 x    try {- Q' b  p; N' B; I
      modelActions.createActionTo$message
( `" Q* w1 ]9 Q9 d        (heat, new Selector (heat.getClass (), "stepRule", false));+ g- m1 [6 J0 e: `: [
    } catch (Exception e) {* V1 g" w' q' m6 n4 q) {
      System.err.println ("Exception stepRule: " + e.getMessage ());
5 r/ z: O# f4 D    }
5 q* F7 |% z6 E" j" ?5 R
8 q: E" B$ Q# N. r: Y2 v9 m- q* N! ~    try {; [' H' t) ~! M
      Heatbug proto = (Heatbug) heatbugList.get (0);) t9 w* b; ]. M' B0 q0 q
      Selector sel = / t* U; s0 y- b: y- }
        new Selector (proto.getClass (), "heatbugStep", false);2 p; m8 C1 i5 d
      actionForEach =. V6 l! B2 C2 a4 d
        modelActions.createFActionForEachHomogeneous$call
8 _1 I" j2 L" V& B        (heatbugList,
1 L& I4 m& W3 Y5 Y         new FCallImpl (this, proto, sel,
7 R9 f5 a# Q* T/ q                        new FArgumentsImpl (this, sel)));
3 m* ^& N1 z* @6 e6 c    } catch (Exception e) {
5 W0 o8 d$ ~4 G0 O4 H      e.printStackTrace (System.err);
  a0 N7 _  Y4 B) v    }
: M) j# ?! \( D$ i* w   
* H4 p; k- |0 d  H4 q5 O2 _    syncUpdateOrder ();
+ H% B$ i1 o* X! \) B2 g3 Q5 K
    try {
+ r  n% s5 b# I  V      modelActions.createActionTo$message
0 ^% F' a( E) z0 Z' d5 d        (heat, new Selector (heat.getClass (), "updateLattice", false));& a: d" ~# e2 }) Q; d$ K
    } catch (Exception e) {
; N- d9 A* k# x4 e( H5 N. z      System.err.println("Exception updateLattice: " + e.getMessage ());; E+ V$ B8 L5 N& e: t/ w" X
    }
6 |# |5 P0 j) U, Q! ^        5 l7 c, [: ~$ W
    // Then we create a schedule that executes the
: C4 u& q+ r% g/ m+ I; f9 m    // modelActions. modelActions is an ActionGroup, by itself it
$ P3 F/ E" m  ~; ^' ]    // has no notion of time. In order to have it executed in
# }, `- d/ B, _9 x6 |9 {4 ^    // time, we create a Schedule that says to use the) j) G' w7 Y. [  O; h# P- f
    // modelActions ActionGroup at particular times.  This
( M. \  w" _3 N; M    // schedule has a repeat interval of 1, it will loop every9 N+ \7 }) i% e' w0 T- O: F; r
    // time step.  The action is executed at time 0 relative to
* o+ H+ _7 W/ M7 F/ Z" V    // the beginning of the loop.
8 z5 ^. s4 U# s; Q
1 a: J2 T) C& \$ x5 [: K1 a+ B    // This is a simple schedule, with only one action that is
0 r$ j+ M2 v5 ~- |8 B, ^    // just repeated every time. See jmousetrap for more
2 y& h+ O' R2 f; w( y7 `6 U0 r) M( m    // complicated schedules.
% F3 k6 F( u: Z0 o/ A  
8 Y: l# U0 L$ E; @5 G    modelSchedule = new ScheduleImpl (getZone (), 1);- w% |( N! O2 K% ?1 B" ]) W& O
    modelSchedule.at$createAction (0, modelActions);
& w/ r* K( w( t8 }- o! V9 X$ i        
+ T5 {' j3 O" e- ^. R) [- K    return this;9 ^7 H* k- a5 x1 i( |
  }
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