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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:; \) f. [  e0 R6 B" ]" {
% ]( K2 ?% D. q% X8 u
public Object buildActions () {9 T5 o' u) M' m& ~. v
    super.buildActions();1 v) W1 b5 R# m
    7 a& ~0 d+ I, l" p- [+ M' s- u
    // Create the list of simulation actions. We put these in) R2 \6 }" Y& ^2 N9 F- |8 t
    // an action group, because we want these actions to be
) `5 b4 ], o, ~- {    // executed in a specific order, but these steps should* z8 }# ^" E  x$ H  h. A' b" d
    // take no (simulated) time. The M(foo) means "The message1 z0 B; m( W, A* W- j
    // called <foo>". You can send a message To a particular) r- }# P6 g# o
    // object, or ForEach object in a collection.4 @' f  U* q( K$ ~; b; H& j
        5 U' o2 S3 J; |/ S+ w4 d
    // Note we update the heatspace in two phases: first run
' b+ Q! ]$ A& S    // diffusion, then run "updateWorld" to actually enact the1 [8 b" q) A3 T2 v: X
    // changes the heatbugs have made. The ordering here is
' a! w9 u" s4 n7 l, \5 C    // significant!! j( y1 {- O! q
        
6 k- Y2 S4 K, L; `4 J# f: L    // Note also, that with the additional$ A% x* W3 b1 B
    // `randomizeHeatbugUpdateOrder' Boolean flag we can8 U! n! @0 ^: A' T
    // randomize the order in which the bugs actually run
5 n* R; \1 t8 f: Y    // their step rule.  This has the effect of removing any: K! g( k7 a! K( E8 Q, ?
    // systematic bias in the iteration throught the heatbug
7 i' k# j5 S. S. K8 V& {" W6 |1 M    // list from timestep to timestep
7 P* m+ m$ b% y7 @) |        7 m& v  m2 @! Q( Q6 `
    // By default, all `createActionForEach' modelActions have' F8 |+ e( n. x4 h; V1 y, e
    // a default order of `Sequential', which means that the
0 f% B3 P& u) \    // order of iteration through the `heatbugList' will be9 Y* V1 Q8 L  ~0 W& i" R5 [
    // identical (assuming the list order is not changed" d& @& L$ V5 c* i/ J
    // indirectly by some other process).
$ t  Z  W- `& [0 r   
* M( \% y1 f4 R    modelActions = new ActionGroupImpl (getZone ());
& ^6 q$ C0 ]  h/ P8 l5 ?( H4 c! a7 @+ z; R/ P
    try {1 t' V- w. R5 p
      modelActions.createActionTo$message# x, g2 E$ i( w! K3 ^
        (heat, new Selector (heat.getClass (), "stepRule", false));0 c+ p. A. T3 C6 o7 {
    } catch (Exception e) {
" |3 P3 g2 L9 K      System.err.println ("Exception stepRule: " + e.getMessage ());6 p5 \8 X& v# o; j& L2 A! h
    }/ g2 l  x# x; ?! E; r- o

* h* z. \( F# ^2 ^    try {# i: Q  D6 I! I
      Heatbug proto = (Heatbug) heatbugList.get (0);
3 g+ F) Z) G# O7 ]9 w9 V6 k% q/ d$ \      Selector sel = ! o7 n/ g2 Z. v% J1 w2 Y
        new Selector (proto.getClass (), "heatbugStep", false);  I' @( p* [1 B
      actionForEach =/ O5 S. U3 W  t. R" N' j( C( D
        modelActions.createFActionForEachHomogeneous$call3 d- O% z: @# i$ J1 A
        (heatbugList,
* V' C1 {" r  k         new FCallImpl (this, proto, sel,
* A0 @. }% B, H, v7 F2 ]- B                        new FArgumentsImpl (this, sel)));. c4 A6 D8 b8 h# G2 L% a8 ~9 n, ]. Q
    } catch (Exception e) {
& y0 {3 Y6 @5 J! S! V$ p/ E      e.printStackTrace (System.err);
  u  P+ x" _. p* E( O    }$ {" E' r) b, Q1 a) ]" w
   
, T4 k, @& ?" g    syncUpdateOrder ();' k4 B) I; a4 Q/ \+ _! k5 ~
  o7 i: D: [: T0 G/ ]# i( u6 I
    try {2 A/ D" R( _6 T! Y: e. Z& }( `
      modelActions.createActionTo$message 9 ?5 V0 \1 b3 V) P" R8 p
        (heat, new Selector (heat.getClass (), "updateLattice", false));! Y( v; Y4 H0 B, F
    } catch (Exception e) {
; `+ p+ D. q9 [2 N: ^& `      System.err.println("Exception updateLattice: " + e.getMessage ());
7 S1 `2 G8 [$ n( p+ \! k    }
) |& [- M& Z$ W3 K        
. P8 M/ u  u3 t% R1 ^, Q+ {4 Y    // Then we create a schedule that executes the
5 G3 n+ E/ B) N2 l) @; q( L    // modelActions. modelActions is an ActionGroup, by itself it
# p% [( K" }/ ]! U7 L( G    // has no notion of time. In order to have it executed in( y& @: q2 Y; G" s* v+ a
    // time, we create a Schedule that says to use the
+ N( c! Y4 q1 ?; l; R) w    // modelActions ActionGroup at particular times.  This" v! G# l! ], z& V0 X/ E" }/ h  ^+ b* J
    // schedule has a repeat interval of 1, it will loop every
, g9 q* [  y) L3 Y+ a    // time step.  The action is executed at time 0 relative to# R6 {8 x& e, X9 [1 D4 `: k
    // the beginning of the loop.& n; [1 J) c. G$ Z1 ]# j
) I9 r  Z- B3 M/ f7 ]2 C1 U2 _6 X
    // This is a simple schedule, with only one action that is
% R6 x) o5 P1 t, n. S6 }    // just repeated every time. See jmousetrap for more
  [# j& i' x" o! E; v: B    // complicated schedules.$ Q! A, s1 f5 V6 `/ M
  ) `: _" ?5 W+ k: b
    modelSchedule = new ScheduleImpl (getZone (), 1);' c) D7 i) u# k! U4 ~2 b) s
    modelSchedule.at$createAction (0, modelActions);; o5 f' x0 U8 i8 j4 z
        * `. v" l. b, }2 e; e' ?) w
    return this;+ e9 t7 N6 M% W- j0 n
  }
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