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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:! G( x8 C. f" U

+ }6 t' q- V% e+ e' G6 R2 t public Object buildActions () {& @2 C/ j2 f% k7 E3 Z9 S2 z
    super.buildActions();7 j9 a& S$ q. V# {
    & k# h! S0 h# ^7 S
    // Create the list of simulation actions. We put these in. a6 Z- u/ J* i1 [/ x
    // an action group, because we want these actions to be
( d$ h, X) ?6 T% w' P    // executed in a specific order, but these steps should" H  d3 c, G* o  M6 a
    // take no (simulated) time. The M(foo) means "The message
0 O! M4 o& A0 a9 L; Y    // called <foo>". You can send a message To a particular0 T7 }1 i% A; X6 z5 [) d' p
    // object, or ForEach object in a collection.
8 [+ }6 ^0 q( c" c* M        1 |2 |. [3 Y8 y: t: W! H' }
    // Note we update the heatspace in two phases: first run6 Z/ S; B  l" W2 T3 U) ]
    // diffusion, then run "updateWorld" to actually enact the% K) G4 O( o* O, T! P
    // changes the heatbugs have made. The ordering here is
. T+ m, ~' ?7 p4 @  ~9 N    // significant!7 }  a& g, L0 ]: G  F7 B
        
9 F7 j: C0 a. Z9 i    // Note also, that with the additional
/ z1 `, d) e  c5 C' I6 n( `    // `randomizeHeatbugUpdateOrder' Boolean flag we can
4 S; \- ]( c0 D+ R; |8 |; Q    // randomize the order in which the bugs actually run- j* L; }6 y4 U! e; p4 g1 n% \' O7 C
    // their step rule.  This has the effect of removing any
2 r+ ^* q6 o5 K5 B' `& T7 ~    // systematic bias in the iteration throught the heatbug# ~" d! J- u2 q9 r+ \1 k
    // list from timestep to timestep
. N( ?4 |$ \- y        9 U" r, O& I# a- f4 v
    // By default, all `createActionForEach' modelActions have' W2 m9 B. B1 c' v9 {8 \, f5 h
    // a default order of `Sequential', which means that the/ g$ e8 ^) Q( ]5 ~" N8 n
    // order of iteration through the `heatbugList' will be
; s/ k% K8 s; Z+ O# m& p( S! q    // identical (assuming the list order is not changed
) g  p, l- Y, z* X% p    // indirectly by some other process)." g# _, t8 A! L1 S& E' u% Q7 l
   
$ m1 l- Q8 r6 s  C& [    modelActions = new ActionGroupImpl (getZone ());4 ^5 p0 p' [5 P' P6 {& O
! p) d% y: t  y/ z
    try {3 G  G$ R* _( Z& P7 j3 d  D
      modelActions.createActionTo$message  u$ r) l5 P0 L0 R7 f3 R
        (heat, new Selector (heat.getClass (), "stepRule", false));
6 r( y- c/ O& ~; |- {0 M2 }: d% w    } catch (Exception e) {
1 p& P2 M# {1 ?. i' z1 w( @9 O2 [      System.err.println ("Exception stepRule: " + e.getMessage ());; x+ g+ N! Q. ]
    }% U9 {8 H. f3 @, u

  T) S5 g0 S* @, d  x    try {
& h9 G$ j1 Z) b8 s; v4 c. [2 B% S! j      Heatbug proto = (Heatbug) heatbugList.get (0);- G7 a7 h$ }) |) i, _/ S) X
      Selector sel = 8 Q( l6 q4 {" p# k' [  e$ B. T
        new Selector (proto.getClass (), "heatbugStep", false);9 ^, P2 Z4 @. L+ M) ~0 \) s3 G
      actionForEach =7 A% P1 \& J3 s8 l
        modelActions.createFActionForEachHomogeneous$call2 b0 K. D' ~& m  a9 h1 p
        (heatbugList,
6 F2 Y! t8 l8 ?         new FCallImpl (this, proto, sel,( I( ?3 U; n* V5 B8 r; y) J4 B
                        new FArgumentsImpl (this, sel)));
2 J8 o* h1 ^8 z6 V    } catch (Exception e) {
! D' N/ m$ S2 ?; [/ L% {: W, p      e.printStackTrace (System.err);' P$ e% [) n7 O
    }2 i& \  k; R& I" |+ b
    - Z" U6 P: @1 Z! ~9 O/ \
    syncUpdateOrder ();0 {3 b# r) M: t' \: i
0 {7 F  c! X# D) M
    try {
& q7 ~  X, q) C6 X% D2 k! b      modelActions.createActionTo$message , C0 a( [' ~( P$ {
        (heat, new Selector (heat.getClass (), "updateLattice", false));+ W- }8 \3 S! {0 @6 o5 E
    } catch (Exception e) {
3 [( v& _1 K+ N* l7 Z      System.err.println("Exception updateLattice: " + e.getMessage ());! }  Y1 v7 ^0 ]2 b$ J$ K
    }
) Y& b# j# F+ E2 M* H8 w9 B        
: {9 f- H, x" W2 _8 \    // Then we create a schedule that executes the1 O5 y: W$ H; j& r0 }
    // modelActions. modelActions is an ActionGroup, by itself it3 o: U/ N( U* `
    // has no notion of time. In order to have it executed in  D# U5 O- l9 l$ h/ i+ s
    // time, we create a Schedule that says to use the$ o5 G; ~4 M) W5 a' U. v* m2 Z
    // modelActions ActionGroup at particular times.  This; T  e7 K$ ]+ o) z5 k
    // schedule has a repeat interval of 1, it will loop every
8 k+ C- j' m- U: x    // time step.  The action is executed at time 0 relative to
! T: Y; s8 w# A8 w8 g1 e# [7 q    // the beginning of the loop.
( z: M; a- \# H+ Z; i
- B8 F9 Q! j  G6 {" F$ P, ~    // This is a simple schedule, with only one action that is
& k  \( O8 [) F" U; g) V, D; {, H    // just repeated every time. See jmousetrap for more
9 \8 M, @( v2 Q5 f4 d    // complicated schedules.
* n% L( Y# i5 a4 k: n! X+ u  6 s% |& Z! Y4 O9 O" V; O) z( r
    modelSchedule = new ScheduleImpl (getZone (), 1);
* h% d8 ?0 J4 M: G    modelSchedule.at$createAction (0, modelActions);
1 N6 w1 [; A- j" N1 t( Z8 S* N        
$ X9 g3 w8 B0 E    return this;
( t$ {" ^. D0 W2 v  Y  }
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