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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:- c7 ~4 A$ @* A" _  m

7 k2 Y' k1 D4 a5 }5 i public Object buildActions () {' z1 ^7 ^4 O$ r
    super.buildActions();; y% M4 W7 \# f- \  ?6 e) g
   
; a% O2 x' I& @    // Create the list of simulation actions. We put these in+ e# p) x$ R/ x& Y3 V
    // an action group, because we want these actions to be
' _& ^0 Q# G; ]6 h& q, X* s    // executed in a specific order, but these steps should5 b0 {. N  q' Z2 U  k8 u  z! f
    // take no (simulated) time. The M(foo) means "The message
' i! r! ]$ `3 N' Z( K( l* V    // called <foo>". You can send a message To a particular$ y: G6 O4 a+ J) D$ R- A* l
    // object, or ForEach object in a collection.' t1 h/ {2 h3 R/ d* ]! Y- ^
        
" X0 l& A) G, A    // Note we update the heatspace in two phases: first run
- I2 |. Z- a* [9 s    // diffusion, then run "updateWorld" to actually enact the
+ O% u0 I$ n8 A# K( G9 I    // changes the heatbugs have made. The ordering here is9 k/ x/ K* ~% I
    // significant!" p" {$ v) X5 [, _
        
" V% r9 x5 \4 G  t    // Note also, that with the additional
7 ?3 M0 W& t1 i& m/ K+ g% c    // `randomizeHeatbugUpdateOrder' Boolean flag we can
% g) |- f2 j* e+ @6 l8 n) V    // randomize the order in which the bugs actually run
6 _. N& x) L1 q9 ^+ I    // their step rule.  This has the effect of removing any
- g5 |4 f: L5 M9 D1 K+ `    // systematic bias in the iteration throught the heatbug
3 b$ Y# g1 R' @' q( y    // list from timestep to timestep
1 i+ e& Z$ g2 W5 X+ O" g3 e  y1 z        4 p0 [& q8 {" b- Q- y4 x
    // By default, all `createActionForEach' modelActions have1 A3 h& \! b, M$ |- v9 y  I- p1 y
    // a default order of `Sequential', which means that the
3 M2 p" T8 {1 }- }$ D    // order of iteration through the `heatbugList' will be' |& F% x; Y8 b
    // identical (assuming the list order is not changed& L' |4 Y/ Q; U4 R, E+ I% O# M
    // indirectly by some other process).
+ E1 M2 ?; @, X/ z8 N* w' V/ Y    ! Z- K8 M1 H6 j2 }/ F# J9 |$ G
    modelActions = new ActionGroupImpl (getZone ());
6 o5 Y" Q; _; I2 W# i- X* C7 W) n6 ?1 {3 R3 p; n6 E6 f
    try {) B5 T; `% K. \4 S) h" \
      modelActions.createActionTo$message
% x. N1 B! x5 o$ P, E4 l: [  M        (heat, new Selector (heat.getClass (), "stepRule", false));  Y6 T/ ]; r" ^  `# c
    } catch (Exception e) {
2 Q9 N7 S- t+ u, {& [      System.err.println ("Exception stepRule: " + e.getMessage ());
: P+ S. ~( G" ~8 m5 M) \! [+ J    }9 X. m' O1 Q  Q" z0 ~/ ^! y
2 v# D( `- B3 z$ w. ^! e4 Z- X) `
    try {
* z+ M/ y8 h0 o      Heatbug proto = (Heatbug) heatbugList.get (0);5 }' ~6 P- S4 O4 i  R; S3 y
      Selector sel =
1 u- `. W8 k+ Q; H$ U5 x( ~( R        new Selector (proto.getClass (), "heatbugStep", false);4 h8 z+ G* T2 V* x) h9 L: @
      actionForEach =% P  w- [% o7 {4 p
        modelActions.createFActionForEachHomogeneous$call
  D, o/ r" O: T5 `" _        (heatbugList,
% [2 Y& |1 s' f5 e  x8 R5 r         new FCallImpl (this, proto, sel,
7 _4 V7 Z3 ^% L% f                        new FArgumentsImpl (this, sel)));
2 x# ^, f% T% U9 p$ ?    } catch (Exception e) {3 S% U# U- Z4 Q& D; b3 ]% g  z5 Y
      e.printStackTrace (System.err);6 ~! a1 y8 M; E, j0 w0 O( b' ?9 _
    }
& R1 V8 x+ D3 j; s' U2 o   
, Y# ]$ V: P, j3 P" `    syncUpdateOrder ();
8 o& e- T! n6 v7 l% R8 n% V# I& j, q2 p$ h5 v
    try {
) H2 x: G+ y8 F- F+ h      modelActions.createActionTo$message 8 B. J. G" N+ c2 \/ j$ |+ C' o1 d$ C
        (heat, new Selector (heat.getClass (), "updateLattice", false));
1 [2 m9 S5 W& [6 L" B$ ]. V$ B3 T. b    } catch (Exception e) {
0 ^$ S3 p) q0 Y8 Q! F5 I      System.err.println("Exception updateLattice: " + e.getMessage ());
7 }6 V/ W& J  |    }
5 U0 [* ^1 l; K# S2 y9 n        
% L/ X5 n" M) F& |    // Then we create a schedule that executes the( [9 q% Q1 P, R3 B+ n
    // modelActions. modelActions is an ActionGroup, by itself it5 V: a$ M. R7 Y8 ^
    // has no notion of time. In order to have it executed in+ J# c4 f; X: c  ?2 o
    // time, we create a Schedule that says to use the
# L. i: U0 n% C3 o+ L- M/ w% \    // modelActions ActionGroup at particular times.  This
! g0 ^4 d% ^6 U2 f    // schedule has a repeat interval of 1, it will loop every/ U! y+ p( [% h! g& q% L) d6 S
    // time step.  The action is executed at time 0 relative to6 J" Q. y; Z# E  e# |5 n
    // the beginning of the loop.
/ o+ x' \: E  @3 i  O, I! b- x! a3 a, t: D9 z
    // This is a simple schedule, with only one action that is
% ^6 E  u8 c6 B- X' H# j+ k$ |8 D& e    // just repeated every time. See jmousetrap for more7 e+ v/ E1 _* m9 Y: C
    // complicated schedules.) l. P0 T  ?# q3 C$ u
  
# c9 p3 A0 V) w1 w    modelSchedule = new ScheduleImpl (getZone (), 1);% ^! c  i8 ]" r4 O  Z
    modelSchedule.at$createAction (0, modelActions);
1 n' S; G# S+ J( C& x3 s4 J        
( ]# H: e: Z! I6 A+ p, A# j. K+ {! }# x    return this;
- k- F+ o% w  Q; q' W. G  }
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