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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:6 ~# i' U& W! ~0 g: m- Q

* r+ ?1 Z9 N7 |1 K: B/ D' K- c; C public Object buildActions () {9 Z& J8 k, L( Y$ Y1 a
    super.buildActions();
: {6 F# F$ o( B0 ~: a. i# }6 _9 U   
7 b2 O+ p1 G$ J( y* c    // Create the list of simulation actions. We put these in& ^( q0 c/ ^3 {  ^" M2 O2 X- G* s
    // an action group, because we want these actions to be9 h( _: b: ^! A' J0 N
    // executed in a specific order, but these steps should
% k6 E* `4 ?& p: F    // take no (simulated) time. The M(foo) means "The message0 l1 ]% E; J- g6 E
    // called <foo>". You can send a message To a particular1 P% o- X9 v0 O7 \  `
    // object, or ForEach object in a collection.
# f' i2 f2 [3 y1 u/ o' Y        
: Q% U: M& I8 g# a$ Y3 ?    // Note we update the heatspace in two phases: first run
' t' ?3 i/ K5 k( w6 [, T    // diffusion, then run "updateWorld" to actually enact the; H1 S9 k% l; Y) @
    // changes the heatbugs have made. The ordering here is
4 D4 q' x2 k7 G  U  F( [) j9 V  L8 _0 e    // significant!
- s: h4 P' H/ o+ u7 f9 A$ p        ) ^/ a, m4 y0 z; d, N6 t6 n
    // Note also, that with the additional: Y  o  P6 u- n" q/ U# s* Z
    // `randomizeHeatbugUpdateOrder' Boolean flag we can3 Q: G3 s' _" R2 b" X& W- H4 V
    // randomize the order in which the bugs actually run
8 D! I9 O* O+ Q. [6 z( H9 m    // their step rule.  This has the effect of removing any, k6 r* W& h- Y: T8 x' a- Y; r1 P
    // systematic bias in the iteration throught the heatbug
, c# P& a. ?  ]& t    // list from timestep to timestep% k- w2 A# u8 G5 R" H% u8 t) C
        2 v; s+ \( D4 [+ `- {' Y/ ~* X3 K
    // By default, all `createActionForEach' modelActions have
4 v( M. P$ p5 y& y3 y* B. e    // a default order of `Sequential', which means that the! G' ^9 S8 @- l' P- ^. j4 f
    // order of iteration through the `heatbugList' will be
. A6 O% l4 `9 {  [+ D" b5 ?* ~9 l    // identical (assuming the list order is not changed$ ^/ [% c4 [  D) w
    // indirectly by some other process).
, h- J5 |$ |# u      `& a: e5 X) N6 ~: r' N$ _. y
    modelActions = new ActionGroupImpl (getZone ());% J/ q- [9 G& G5 @7 i

7 X( v$ e& i9 e1 k) K    try {
5 H( p$ x. j% L1 E      modelActions.createActionTo$message1 X- z0 F" h  D& H
        (heat, new Selector (heat.getClass (), "stepRule", false));! n+ P/ z5 T# ]" \1 d% @
    } catch (Exception e) {, R6 G' B4 J, Q0 [
      System.err.println ("Exception stepRule: " + e.getMessage ());
/ p! [' i2 G# F# V, W    }
/ j* Z  k$ g3 V' y/ F2 ]
! j- A" p  G2 L: {  R+ }8 f    try {
/ d  Y! X2 ?& f) M      Heatbug proto = (Heatbug) heatbugList.get (0);
4 E! X: y* {6 B/ B1 X      Selector sel =
7 `+ y2 `, E- P# @        new Selector (proto.getClass (), "heatbugStep", false);% U/ O4 v6 P3 a* V
      actionForEach =: R" j6 b) K7 D0 H* _9 `; \
        modelActions.createFActionForEachHomogeneous$call" ?0 n0 ?* ~& r* W7 J
        (heatbugList,; g# _3 P' f  v' J0 G
         new FCallImpl (this, proto, sel," e6 Z; ?9 W# u/ W- s
                        new FArgumentsImpl (this, sel)));
$ |7 d$ Z  d) ?% ?! p  I    } catch (Exception e) {
2 ^/ \8 B) l# O% z      e.printStackTrace (System.err);. C+ F% A' a/ a) l. N
    }& s, V: Q& C# B5 }6 K9 o& C
    2 K( l+ C/ ]0 C5 B  u7 c
    syncUpdateOrder ();
7 H# Q$ e) i  s$ @9 l* _4 W" Q8 s- h$ h) @" i
    try {4 u1 f8 T6 U  ]8 p2 d
      modelActions.createActionTo$message ! ]9 k4 W+ V: w! E
        (heat, new Selector (heat.getClass (), "updateLattice", false));$ U3 `. j( j' E# A6 m
    } catch (Exception e) {: A" i& ]3 j  W( U3 }; o
      System.err.println("Exception updateLattice: " + e.getMessage ());/ x3 d3 s0 D$ a9 n5 r# V  m
    }% u" p1 T6 T. i2 u) u( k1 c
        2 n8 a5 l/ \& ]0 S% {1 q
    // Then we create a schedule that executes the/ Z1 b; n' P1 W4 B; F. ~* ?; k
    // modelActions. modelActions is an ActionGroup, by itself it4 Q7 {! L0 m7 r; L# ]- J
    // has no notion of time. In order to have it executed in
: O1 M' Q* X1 ]) y* t; p; K& R    // time, we create a Schedule that says to use the- o  `0 I# ~& v* l* M2 w6 X# p
    // modelActions ActionGroup at particular times.  This: g6 o! T5 r; A  h! C) y
    // schedule has a repeat interval of 1, it will loop every. d3 C* x3 P2 v2 ?) J
    // time step.  The action is executed at time 0 relative to7 r' J. R6 \0 |5 }+ s* L4 }
    // the beginning of the loop.
( R# N. m' r. [" |" m
/ l/ ]7 C0 _9 B6 M0 x( |- I    // This is a simple schedule, with only one action that is
% _7 B( q! b% k% M# F  Y! g0 N    // just repeated every time. See jmousetrap for more
& f$ `% {% O  {: t6 `    // complicated schedules.
1 S) Q5 o( S  k+ {% O( X3 W. p* _  . j' M5 s- k0 z7 Y3 G0 X
    modelSchedule = new ScheduleImpl (getZone (), 1);
$ ?5 `% q* ]: ~# F* ]    modelSchedule.at$createAction (0, modelActions);. u3 W- j' z5 ^
        
' a$ ~7 I% B9 J2 H    return this;
( _4 G9 T2 P' g/ g( z2 Z  }
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