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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:
! k0 D' W0 q; F; n" K: K# G) t/ L; f- `9 h5 E* R1 l
public Object buildActions () {
8 P* G# P0 b9 R9 z    super.buildActions();
% B0 s5 V3 J2 }6 I! L   
% E" c( F" D& a* [$ t9 I    // Create the list of simulation actions. We put these in8 B+ @! V! ^& U$ `; Q0 W
    // an action group, because we want these actions to be6 m# c/ e& _8 _: G8 w( W& o8 [" I5 |
    // executed in a specific order, but these steps should# z- B  N5 _2 h( w9 k8 J; q
    // take no (simulated) time. The M(foo) means "The message
2 [: u3 |1 M" p  {  c    // called <foo>". You can send a message To a particular
0 I' ~& Y+ s. {+ V% q    // object, or ForEach object in a collection.: p1 x/ }2 Z  y+ O
        
: e( p: {' j3 h2 L7 h5 p" J! _    // Note we update the heatspace in two phases: first run% `- r0 a) Y) O# M- s* B
    // diffusion, then run "updateWorld" to actually enact the+ V- U% i! T# L" c5 k; k, ~
    // changes the heatbugs have made. The ordering here is6 W3 L( k% r, `! a2 }( t
    // significant!
2 l/ W: T- \2 Q( z        : C7 X. `5 U; _
    // Note also, that with the additional
: l# a( u8 g/ J4 @2 `- }: Y3 v1 z8 b    // `randomizeHeatbugUpdateOrder' Boolean flag we can
* w6 h3 v5 N+ `. Q6 i    // randomize the order in which the bugs actually run
' V. k7 b4 D/ S    // their step rule.  This has the effect of removing any
1 E( l) C' G% Y) ^. _5 K2 n    // systematic bias in the iteration throught the heatbug# ]/ L! r( e5 h  ]/ U( \
    // list from timestep to timestep
- G( [3 \' D' M0 U1 Q! ?/ L6 @& b        " m7 I2 s2 r( W7 q/ G
    // By default, all `createActionForEach' modelActions have
( o$ O# z4 D# j0 N" Z    // a default order of `Sequential', which means that the  M# Q( m) c, @/ o, {, F7 X1 j% {
    // order of iteration through the `heatbugList' will be
- J- E7 y# d8 b/ Q  R    // identical (assuming the list order is not changed
) W( n# Y8 d2 h$ n3 D( y0 D    // indirectly by some other process).$ H  h$ o0 d  u3 t4 [% ?
   
( L* p% ]3 S" h    modelActions = new ActionGroupImpl (getZone ());: J$ F" b7 F1 B: M% n: W/ G4 S

) F# N2 r& z8 t$ k) q* e! @    try {
0 ?+ n' T: |4 Z      modelActions.createActionTo$message. o  x; o# p( V
        (heat, new Selector (heat.getClass (), "stepRule", false));
. \7 Y5 w- C/ Q" I* ~4 w    } catch (Exception e) {& g* c/ p- G: @  J
      System.err.println ("Exception stepRule: " + e.getMessage ());
/ ~8 e& v; |& p/ {    }& T7 ~. O0 `- d; U
5 g) @& a. u% h8 ?7 w7 |4 B
    try {0 t* G2 `: ?: a9 j& x
      Heatbug proto = (Heatbug) heatbugList.get (0);' x# L2 M  X- Y% `7 t; ~
      Selector sel =
3 ^+ E9 X5 n7 J' j6 F0 Q% @        new Selector (proto.getClass (), "heatbugStep", false);) e6 ]! M: P. s
      actionForEach =
) H! X+ F( v$ u! z  l9 _; A0 i        modelActions.createFActionForEachHomogeneous$call& _' I0 u+ ^  e8 {
        (heatbugList,
3 l6 b4 G7 v3 a4 V' X% ]         new FCallImpl (this, proto, sel,
, y1 E( q/ \5 a" M                        new FArgumentsImpl (this, sel)));
. ^) J1 J) M! U/ e7 B! x* @    } catch (Exception e) {* O/ T. ?% ]+ ~. W/ J4 \8 O! Z7 a
      e.printStackTrace (System.err);
7 z6 \$ K- d8 C0 d- x  s    }5 `1 Y& ~& Q9 D3 _3 f0 O& _3 @9 x
   
. }9 y) N( C. a( T1 @    syncUpdateOrder ();
- ?4 L$ r9 s' V$ Y! v
6 i9 X" e2 _, O9 J2 w& O    try {
: i$ J6 H# I! z% w+ A      modelActions.createActionTo$message 3 y7 F7 c' S5 V
        (heat, new Selector (heat.getClass (), "updateLattice", false));) b9 K# i' z; C$ d+ c: L
    } catch (Exception e) {
9 e8 c. e* b/ o- o* z7 Z1 n  O      System.err.println("Exception updateLattice: " + e.getMessage ());
# b" c$ ^! R/ w2 n0 v% O    }( ?; Q4 I5 M' N$ x3 p# _2 w3 n
        
- Q% M; Z0 v. {+ y9 f. \    // Then we create a schedule that executes the' G- u% r7 G. v5 [1 x% P
    // modelActions. modelActions is an ActionGroup, by itself it
. g, a9 x) d. t0 d6 U    // has no notion of time. In order to have it executed in: T6 k! }, O6 C
    // time, we create a Schedule that says to use the
* _' J: p& Q) W7 v  O% L, _0 R    // modelActions ActionGroup at particular times.  This$ s# p; F" A1 A$ y
    // schedule has a repeat interval of 1, it will loop every8 S* R/ a3 K; N  H
    // time step.  The action is executed at time 0 relative to7 t$ T2 T1 J4 O* Z; o# l0 i
    // the beginning of the loop.. L+ U6 \, y8 j4 g

. [) A) Q( u; o3 W    // This is a simple schedule, with only one action that is0 ~6 v6 [; v  |  j& g
    // just repeated every time. See jmousetrap for more
# h; n/ N* f$ W  O- B) D    // complicated schedules.
$ D3 U$ `# a$ Z  7 V. j- P0 q1 S- K5 o* ^; c$ ^
    modelSchedule = new ScheduleImpl (getZone (), 1);
4 f2 B9 G4 `  q: N, A, t    modelSchedule.at$createAction (0, modelActions);0 I8 w$ B: z% b8 P
        0 B% u. {- L/ y4 T2 {- Q% _
    return this;2 q& B* S2 n$ z5 {- T
  }
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