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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:  ^1 ~' T  B3 F+ z0 R( G+ j
/ M$ X5 X" k: p  l: f
public Object buildActions () {
" c6 a5 w1 W) ]' P/ p# m    super.buildActions();5 R! ^6 Q  x4 q$ D8 h# }9 y9 W! W
   
: o  ?4 J! D" z' s7 C+ ~    // Create the list of simulation actions. We put these in" u( J  F7 v5 X+ g  ?- }; t: ?
    // an action group, because we want these actions to be1 f7 U" q  T5 ~
    // executed in a specific order, but these steps should  a" p; g' o/ G+ d% ~" K
    // take no (simulated) time. The M(foo) means "The message
( X4 \0 M8 O" L7 V# r    // called <foo>". You can send a message To a particular
8 a# e2 g" v' w3 j% q. P8 C) W  [1 H    // object, or ForEach object in a collection.% H7 }7 S# F5 H, N
        
9 B5 k4 s) W4 n" T" K" t$ @    // Note we update the heatspace in two phases: first run. J. f: P# L6 Y
    // diffusion, then run "updateWorld" to actually enact the2 P0 ]6 ?$ m% L7 J1 p
    // changes the heatbugs have made. The ordering here is
7 u: O) w0 N3 }/ Y. l    // significant!
# ^6 p; A- o0 C3 |7 H        1 Y! X( b- K7 @" U7 \+ C
    // Note also, that with the additional
+ a) ~* N4 X" ]; f( s; J5 R    // `randomizeHeatbugUpdateOrder' Boolean flag we can* }7 Z! K( f0 r% ?2 B0 Z
    // randomize the order in which the bugs actually run
7 ~; p) I: G5 u- n0 w( x( n# n    // their step rule.  This has the effect of removing any- N5 p. C/ p; h9 \! M; ]* \
    // systematic bias in the iteration throught the heatbug3 }$ C9 X" k3 W( F- I  u$ t
    // list from timestep to timestep
) ?/ F. a% |* M        
" _2 {  h/ C% V' u* \: _    // By default, all `createActionForEach' modelActions have, U) X- y( Z  S! P
    // a default order of `Sequential', which means that the/ F& Y0 L! ?- U+ h% U  m
    // order of iteration through the `heatbugList' will be4 A1 M' s8 ]+ A/ D% d6 q) P. w
    // identical (assuming the list order is not changed
- a9 e# o/ O" O% U1 |# w. s    // indirectly by some other process).
% s- k0 Y6 V+ _4 ?    ( O1 k) B7 k; h
    modelActions = new ActionGroupImpl (getZone ());
/ I5 Q: C: o/ J% B9 z2 A* i5 ^' g0 B- b; {2 e0 p
    try {) J$ E# L) f4 \3 M* q8 E
      modelActions.createActionTo$message
9 V9 U5 F  F/ f& b1 |. j        (heat, new Selector (heat.getClass (), "stepRule", false));
: s6 L( [* m. N    } catch (Exception e) {
% s1 Q$ T/ g9 s9 _      System.err.println ("Exception stepRule: " + e.getMessage ());( a9 J$ j& X6 Z& K
    }) X; c" g4 u- A
' U/ O8 [$ b9 y
    try {' Z, l$ ~3 {& Y0 J3 H# g
      Heatbug proto = (Heatbug) heatbugList.get (0);
2 Y0 \5 U; a% B' N( M      Selector sel =
  N" f) y8 T7 j: g; q+ ~4 i% ^        new Selector (proto.getClass (), "heatbugStep", false);& V% x. r/ R- o- c+ T
      actionForEach =
" `% f# e+ k; d        modelActions.createFActionForEachHomogeneous$call" R  R6 M3 G4 B% v7 C; u% H( D
        (heatbugList,
; H7 x9 F6 x& r) {' O3 \; b5 a         new FCallImpl (this, proto, sel,
; G! Q# W! d+ T' y( _2 ]                        new FArgumentsImpl (this, sel)));! ^2 D( w5 ~- [( T
    } catch (Exception e) {
& O/ T9 @, J3 @% _+ D4 g+ c% ?      e.printStackTrace (System.err);
  ?+ r/ ?+ m& e3 B    }
$ f. _: q& Z, h, W' M9 B0 C/ @   
% C4 I* ]9 T9 N/ M3 c+ r    syncUpdateOrder ();, Q+ w' Z3 ?/ M% c% F& d* a

( n7 Q3 w1 g1 O7 [1 x    try {
* R1 e6 W" A4 [( l      modelActions.createActionTo$message 6 b% j/ \4 q* C- C
        (heat, new Selector (heat.getClass (), "updateLattice", false));3 C0 ?' X7 ~6 L9 \5 [
    } catch (Exception e) {' {$ K. ?% V- E
      System.err.println("Exception updateLattice: " + e.getMessage ());
# X  x: r4 {. {0 W+ z    }
  y/ x9 U- S* Y( F) [8 h        
- |, p: o% [1 A& T    // Then we create a schedule that executes the
$ {" V' X$ [; v/ m$ \$ X; k: i) P; r    // modelActions. modelActions is an ActionGroup, by itself it: D, y7 U/ l  ^( ~. M* W
    // has no notion of time. In order to have it executed in
0 k' u" A: ]; R  n7 q& e8 o    // time, we create a Schedule that says to use the7 K2 |' w8 J" Z
    // modelActions ActionGroup at particular times.  This. d* d# B% _- O5 e3 ?. ^
    // schedule has a repeat interval of 1, it will loop every" X& F2 X; @2 c1 {8 O! D
    // time step.  The action is executed at time 0 relative to
+ h. f$ Q" Y$ d; a* [2 ]) I    // the beginning of the loop.$ o! N( o; n- P' m0 A
; o  k3 z" p# }/ d  D* R2 ]
    // This is a simple schedule, with only one action that is
- x7 A( |  x7 i% s- z) M    // just repeated every time. See jmousetrap for more
' I1 }: z; B9 h* e    // complicated schedules.
9 l2 Q5 p7 T" N& u" _7 w  
! V4 f2 S; v3 S2 E- @; i3 M; H    modelSchedule = new ScheduleImpl (getZone (), 1);
# J  g& h) t( e; z) e7 t    modelSchedule.at$createAction (0, modelActions);' m4 n; V+ |# b
        - ~2 {) h# t4 z  \! u  X- P, b, K2 p
    return this;
- @2 G4 _1 \2 M6 i4 C( {; ?  }
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