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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:
8 v% L8 ^+ ^1 T( Y! E6 C, \! F  J
public Object buildActions () {
4 T% f6 j4 j7 W    super.buildActions();
* y  A; w& j% N/ Y- M; f' m    ; z0 m1 S0 ]0 Z- A6 p. B2 T
    // Create the list of simulation actions. We put these in
3 Q" A3 H6 A5 p$ T    // an action group, because we want these actions to be+ ]# g$ E/ G- H4 P6 Y* w7 m1 _
    // executed in a specific order, but these steps should- y* D/ c5 M* a. }
    // take no (simulated) time. The M(foo) means "The message
; ^* Z& Z+ i( m) x/ N    // called <foo>". You can send a message To a particular/ T- E4 s/ S* ?, D- ]) r/ L# n. G
    // object, or ForEach object in a collection.
: H6 s/ j4 K  U        & @: ~$ d$ W0 t: Q" r
    // Note we update the heatspace in two phases: first run
% c" V$ x+ ]$ c" x* C- r    // diffusion, then run "updateWorld" to actually enact the
7 G8 a0 x$ ^. P9 @- S, X) v# {    // changes the heatbugs have made. The ordering here is, Q9 v8 d4 I9 v* p
    // significant!
% J/ F% E7 m8 P4 U* ^2 @  h1 u        6 _; M$ P- m" n; h% |4 ?
    // Note also, that with the additional* z5 t5 K, H: H9 x2 ~/ ?% u$ y
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
: S# M# ~2 A* f8 ?    // randomize the order in which the bugs actually run
, `  t# j1 S) V    // their step rule.  This has the effect of removing any
( u; c! Z5 `  w% g6 A9 N% m    // systematic bias in the iteration throught the heatbug
9 W5 H$ u, g& T: G5 G, f- `    // list from timestep to timestep
) Z' O1 \. q3 o- h+ P6 I% ^        " M7 k- ?/ E1 z+ w& g
    // By default, all `createActionForEach' modelActions have
  F7 s# P/ F# F6 N    // a default order of `Sequential', which means that the
* S9 l+ x# o5 b. \0 o8 W    // order of iteration through the `heatbugList' will be: {( q' V0 m8 `7 G" p3 G
    // identical (assuming the list order is not changed) A  a: k2 i5 U) M0 t5 k- K6 Y
    // indirectly by some other process).
+ h6 N7 G% k& I, h! j/ f) K6 A    + i( Z1 U7 u$ R0 s& f
    modelActions = new ActionGroupImpl (getZone ());
6 t  r& ~$ i3 E' M& n: D) {- d6 f; ^, t2 V9 x/ B; D
    try {4 z% b( Y. ~/ M3 r! B# ?/ }
      modelActions.createActionTo$message
' c. z' [' }3 C' m$ F, `/ |& j        (heat, new Selector (heat.getClass (), "stepRule", false));
. ]% e" f; @5 z1 T9 d    } catch (Exception e) {
7 Y  P1 d0 \) c* Z' o# K0 o  K8 T      System.err.println ("Exception stepRule: " + e.getMessage ());$ E3 N% j  @) h4 ^" B  F
    }6 @  [( |7 h9 b* b

! I0 a2 N# ?2 v+ S) U- r) T    try {
2 |! M% ]/ w8 }5 Y      Heatbug proto = (Heatbug) heatbugList.get (0);
( B' z* m9 d8 K$ L6 D      Selector sel =
0 r  L9 T9 X. R- r' D        new Selector (proto.getClass (), "heatbugStep", false);
% F) a# k) ~! G' E% ]2 ~& I      actionForEach =
. `7 B+ g2 ~$ r2 Y& \; f. _        modelActions.createFActionForEachHomogeneous$call, Z& I+ M- G9 K4 ~) B
        (heatbugList,- r( L$ ]* m/ Z- N% P, W5 G
         new FCallImpl (this, proto, sel,
6 A4 k3 S6 s! S. \9 T7 h5 S                        new FArgumentsImpl (this, sel)));% S! v5 O2 R- S: W- {2 C- I
    } catch (Exception e) {3 W* i2 Z  `+ X8 u
      e.printStackTrace (System.err);
- c8 [+ n4 w& q. i1 E  o1 u    }
9 u. \5 _0 o8 v+ I5 E: N" d   
* a% `2 g1 V4 H& z- G1 h- e    syncUpdateOrder ();  A0 f- j6 H- q5 ?9 V# M4 r
2 B" v; r! X( Z" T5 u7 Z' b
    try {$ y! N" e. K' z: n
      modelActions.createActionTo$message
6 @& j% O/ W$ C  _2 Q( V; u! @        (heat, new Selector (heat.getClass (), "updateLattice", false));
" t. P8 S% h/ R) H  R. Z    } catch (Exception e) {
5 X0 T* g- O! U5 U/ {+ @9 [      System.err.println("Exception updateLattice: " + e.getMessage ());  B: f" b1 v& X/ s6 a2 i
    }: }- }- }" x% N* b! R
        : d+ \2 v& M9 E9 k- g
    // Then we create a schedule that executes the9 ?& D3 F8 H) C
    // modelActions. modelActions is an ActionGroup, by itself it- x$ x# W- w; ^, e# I
    // has no notion of time. In order to have it executed in
+ v6 h5 Y3 `, ]+ \. }    // time, we create a Schedule that says to use the
& I( t  Q) Y+ d  x, u5 M3 N    // modelActions ActionGroup at particular times.  This
4 X6 u3 c* _( J; @    // schedule has a repeat interval of 1, it will loop every
* M1 K% A  _1 @5 k2 L    // time step.  The action is executed at time 0 relative to' x5 d  I: ]( o1 Q. k2 R
    // the beginning of the loop.
- `+ y" g# z* S. D6 Q- A; W) n9 D" F9 ]0 l3 ^
    // This is a simple schedule, with only one action that is) i4 v6 P( q0 l; U/ k
    // just repeated every time. See jmousetrap for more
# l) w* A5 l( L$ d' K5 ?    // complicated schedules.
, N1 h8 Y& A0 u/ }+ R  8 w) k: E! }, I; O2 W
    modelSchedule = new ScheduleImpl (getZone (), 1);
& n! A/ D0 h. X# j; l    modelSchedule.at$createAction (0, modelActions);
) s& D7 K: d* n6 C3 ?        : P0 H) G# A- B; N3 ?
    return this;2 S) v* B. k7 T6 w; q/ N+ z) ?% T3 \
  }
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