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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:2 U" e0 _0 c6 k. ?0 }7 p* K# t( q; Y
! O% w2 C. z! P& ~  T
public Object buildActions () {% ]& N: p+ c2 ]7 v: s2 R
    super.buildActions();
/ c+ c, S5 V- @! ?; W   
7 P6 V4 K- K6 V    // Create the list of simulation actions. We put these in4 C" o6 y/ b( W1 o& g
    // an action group, because we want these actions to be+ o0 s  V$ h  a, Y( l
    // executed in a specific order, but these steps should
! h- _% t; d9 i" L6 D  L    // take no (simulated) time. The M(foo) means "The message
4 {* I8 Q1 w- r) g6 W2 ^& J    // called <foo>". You can send a message To a particular, |, S  [) f. A3 F' c2 d4 r
    // object, or ForEach object in a collection.8 l/ y. G6 U% T( A3 T4 d" O
        + ~# R' |' d/ l! o- |. j
    // Note we update the heatspace in two phases: first run
! e9 Q, F4 G' H# Y, J$ k    // diffusion, then run "updateWorld" to actually enact the. Y% y9 ~" V( @+ q6 N( ]1 q
    // changes the heatbugs have made. The ordering here is. q/ h! G. [4 _! u
    // significant!
' r4 f4 M3 \* N        
; g) ?/ w3 p  Y) A/ k- x7 H    // Note also, that with the additional
4 y& x7 M4 K7 {; @    // `randomizeHeatbugUpdateOrder' Boolean flag we can
3 p; y! u: j9 o% E! L. X" c    // randomize the order in which the bugs actually run
$ L1 q& G/ J) p    // their step rule.  This has the effect of removing any
1 J1 a* s) p( D9 t; O    // systematic bias in the iteration throught the heatbug2 r& `: z, P/ k" P3 }
    // list from timestep to timestep! D% J+ T( b/ y) d- Q$ i2 p
        5 w) \2 b9 e+ A; r; S2 A9 A+ z5 G
    // By default, all `createActionForEach' modelActions have  S: `& t: M1 U- ?/ e  `
    // a default order of `Sequential', which means that the5 a9 {6 Z( F! B$ l3 p6 s
    // order of iteration through the `heatbugList' will be/ \) B1 R8 n& d" Q6 j
    // identical (assuming the list order is not changed' T: U  I6 }6 z9 t- f0 R7 ]( r
    // indirectly by some other process).
) W3 g! B' i/ Z4 Q3 g( ^& [. L    / i8 ]* y( h$ C' {8 L
    modelActions = new ActionGroupImpl (getZone ());
$ D1 j$ h. t4 K' X" n3 B' ^: N7 |4 y* D$ ?) g' [
    try {" y( M; Q9 c9 w( Q: C
      modelActions.createActionTo$message
# @- ~0 `% n7 `* K2 E) o9 l' R        (heat, new Selector (heat.getClass (), "stepRule", false));+ K( W% @6 W5 ?
    } catch (Exception e) {
) n( U; F4 ?  F' I3 X; b      System.err.println ("Exception stepRule: " + e.getMessage ());
: U( L9 f) `9 g0 I8 t    }( ^" l$ y/ P5 f; F2 l
1 \8 ^. j% }# p% K
    try {
  z, ~( S2 S3 s% a- T      Heatbug proto = (Heatbug) heatbugList.get (0);* K2 o& Y8 x! J) u
      Selector sel = 1 g( Z6 q% t+ \
        new Selector (proto.getClass (), "heatbugStep", false);$ b' S5 K5 I& G/ W: W* A
      actionForEach =
! ~- C# V! Z; `1 ^9 F* g9 M        modelActions.createFActionForEachHomogeneous$call
' i4 t1 F8 |& a/ p        (heatbugList,* ]0 v: d+ A4 K$ n; @
         new FCallImpl (this, proto, sel,) u$ Q% u) h# E! K& G# Q1 g/ m
                        new FArgumentsImpl (this, sel)));1 E3 g$ }1 |' o' E) [6 e8 b4 n& R
    } catch (Exception e) {
& n/ h4 G8 o- B8 I' E3 Q5 e. W. D      e.printStackTrace (System.err);- @! p3 S9 M0 e- h5 {$ a7 s
    }
; T0 \. v% d( I   
, y- R1 O$ g& A' M    syncUpdateOrder ();
$ t7 W5 A9 c3 P7 U) k5 H1 m6 R6 p0 a& `
    try {! \8 w2 j8 i8 r& z
      modelActions.createActionTo$message
. ^' J& C9 o. S2 R" o        (heat, new Selector (heat.getClass (), "updateLattice", false));
" f3 J, x0 N! W% d    } catch (Exception e) {
/ y' s& O: g7 z# F      System.err.println("Exception updateLattice: " + e.getMessage ());5 B6 S$ D; ]+ ^; D& O
    }  ^& h3 l& @- x. h; y
        
; \* N# O8 @- o    // Then we create a schedule that executes the8 ?, T0 Q9 x' s" m
    // modelActions. modelActions is an ActionGroup, by itself it
4 M9 F, @  w4 N3 I1 c5 v    // has no notion of time. In order to have it executed in% |/ f/ c' Y8 Q( P( N* I
    // time, we create a Schedule that says to use the. s* a5 ]9 e. d' i
    // modelActions ActionGroup at particular times.  This
. C& v9 x1 i1 E1 \( Y( A0 a    // schedule has a repeat interval of 1, it will loop every0 r0 _# y+ f7 E% w; f0 X
    // time step.  The action is executed at time 0 relative to
2 F, g5 {6 M6 p3 l, e/ n  T    // the beginning of the loop.
! V6 J) F& P7 F/ B$ q5 ]2 W8 f8 w9 o0 t
    // This is a simple schedule, with only one action that is
' X9 {0 i/ s/ u- {    // just repeated every time. See jmousetrap for more
: P. `4 U8 i- c' H1 y5 q* }; y    // complicated schedules.1 L3 {1 A- a' W9 a
  
. a" q' P* F6 x, `, k: g    modelSchedule = new ScheduleImpl (getZone (), 1);0 h& t7 ?) `( c% G: D0 K
    modelSchedule.at$createAction (0, modelActions);
  L" ?: ?5 C: Z" O; `        
6 p& ], t% r: y1 Q* p9 \    return this;
4 U6 B4 i# I: ~) M& q  }
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