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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:
: A! W5 a! N* v4 Z& t$ C1 c2 t$ Z* V$ _# ~
public Object buildActions () {
$ }& K4 W5 [0 w7 f+ u    super.buildActions();" D9 G+ z" B( _; G
   
  O: K5 i4 U  Z1 P$ V4 F- @5 O    // Create the list of simulation actions. We put these in
. w1 y2 D$ F+ q    // an action group, because we want these actions to be0 [+ D0 Q" P3 P# h! M
    // executed in a specific order, but these steps should- J+ D5 b6 {/ v* P, j0 n2 [9 b
    // take no (simulated) time. The M(foo) means "The message
+ \% ~8 O9 l- ^+ {    // called <foo>". You can send a message To a particular' j# O7 t" z2 y6 Q% j/ u
    // object, or ForEach object in a collection.* j- p7 O/ U: u% Q7 Y3 o
        ( w( ^% Y$ F  z
    // Note we update the heatspace in two phases: first run
) p6 D- R, i- ^3 z" @/ j    // diffusion, then run "updateWorld" to actually enact the
) P- O2 x, t& U6 t& V6 \    // changes the heatbugs have made. The ordering here is& E3 t( t. H1 [4 v3 O
    // significant!
( o$ }3 Q2 f6 P1 R, ~        
2 z) O! e. [5 ]5 T- ]; N3 T    // Note also, that with the additional' C* N) u  y  A" N5 R. X! t
    // `randomizeHeatbugUpdateOrder' Boolean flag we can7 L: G* I& }  Y  v7 P
    // randomize the order in which the bugs actually run  ?+ G) ?5 R* B: B5 J/ P2 L
    // their step rule.  This has the effect of removing any
$ H' ]$ A! {  i* }0 y1 ?) w* y  L    // systematic bias in the iteration throught the heatbug
% I* I/ a( J( X# B: a    // list from timestep to timestep7 X+ i' c/ r$ X" F" {
        # `+ B3 F7 ?$ u2 T* n
    // By default, all `createActionForEach' modelActions have& |: S* e; U- e0 I- i# q
    // a default order of `Sequential', which means that the
  G' }/ z- a" M. e    // order of iteration through the `heatbugList' will be
7 _6 z% N, N, }) k% h# i    // identical (assuming the list order is not changed0 [  z8 z0 Y- @9 l+ Q8 ^
    // indirectly by some other process).* P9 B9 W; y9 C: p& B/ d1 o
    & K2 Q: ]" h& ]4 }& q
    modelActions = new ActionGroupImpl (getZone ());
- w* c6 a7 k& F# l# b( q4 g7 c2 j/ G( Q) }& E4 @0 H6 f! s6 Q" o* |7 Q2 n7 \
    try {, O4 y. v( P# \& Y
      modelActions.createActionTo$message
. O$ p4 Z. D# \; u8 `( y        (heat, new Selector (heat.getClass (), "stepRule", false));4 m0 E$ {! t  [) W- d: |5 U
    } catch (Exception e) {  b) ~/ k& V  B3 O7 K! K9 C" W
      System.err.println ("Exception stepRule: " + e.getMessage ());
0 {5 ?- Q$ O7 c7 p- y5 H9 n    }
$ F/ B/ _% Y0 p/ I! Z2 d( v1 c* U' r8 H/ w$ c8 j0 ~  p8 ?
    try {3 |0 ~8 ]7 W1 Y* o. F
      Heatbug proto = (Heatbug) heatbugList.get (0);3 Q% b  g: V) u0 V
      Selector sel = 7 u6 S/ z, B5 S  O+ B- h# x9 Z2 a
        new Selector (proto.getClass (), "heatbugStep", false);
2 ]" y% r! u4 X; |; |: t# ~5 C      actionForEach =  n' ]1 a2 g# }8 b0 @
        modelActions.createFActionForEachHomogeneous$call
- m( d* j: N$ T) }& A/ @        (heatbugList,
3 Q/ [6 U1 b% w8 m4 |& ?! [; Q         new FCallImpl (this, proto, sel,  [9 q9 `( B7 z2 V9 \& F4 C/ h
                        new FArgumentsImpl (this, sel)));
1 p! R: g  `: \/ w    } catch (Exception e) {
7 O3 r. h; Z) `$ |: q      e.printStackTrace (System.err);
* ]1 F& g# o3 [7 k& @    }
* p6 k3 ?; H* \$ y   
  U* T5 P  \7 n5 T5 w0 l/ m# f& O    syncUpdateOrder ();. h6 y7 O/ {" q4 L9 C

' v2 ^$ O2 ?4 {4 {) n7 u    try {
( b8 {# {; C! j. b+ \0 F4 v% V! ~      modelActions.createActionTo$message
; o2 u( }7 R& {6 q; P& f        (heat, new Selector (heat.getClass (), "updateLattice", false));/ F2 b% a) Q9 _( X9 k  ^+ }
    } catch (Exception e) {
0 N' c8 h0 i) [- k      System.err.println("Exception updateLattice: " + e.getMessage ());
" j, E3 G: I+ H    }1 i% u+ N' ?3 S% i/ P  H- R6 G% ]) d
          c2 e$ m2 j$ X$ R% _+ S2 O8 ]
    // Then we create a schedule that executes the/ `# @7 w9 [  P
    // modelActions. modelActions is an ActionGroup, by itself it- O8 ?8 T" K1 D& Y; j; q
    // has no notion of time. In order to have it executed in* x% h8 l8 Q  k1 q
    // time, we create a Schedule that says to use the
) r5 q) Y  Z2 R/ i    // modelActions ActionGroup at particular times.  This
* S5 |3 ^" c* Q$ F    // schedule has a repeat interval of 1, it will loop every
1 n) }5 l! H" n# Q) C8 c  f    // time step.  The action is executed at time 0 relative to
. Q; h+ _; a* g) Z    // the beginning of the loop.! I# U$ T1 x$ f" d

5 P  ^2 n. w0 H: f    // This is a simple schedule, with only one action that is
+ A+ l- S7 y6 D7 m    // just repeated every time. See jmousetrap for more
: T: w1 }+ ]* H5 r' k; F! v. F' e    // complicated schedules.
! b0 V" H% A0 v  ( ?6 C# f/ a3 ?& W" X# f' A9 o: J
    modelSchedule = new ScheduleImpl (getZone (), 1);9 d" L4 _9 |: L5 Q
    modelSchedule.at$createAction (0, modelActions);
, l% w" W, r& i9 M  J+ N9 A; |        , _) |! `2 X: X+ m# ~
    return this;
" ^; ^: A& B9 l1 p  }
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