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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:3 S2 [( q/ u  m& s0 ]( v5 a

9 t, ]! n8 G7 w2 p7 F public Object buildActions () {
+ {& U% E) O1 O4 C0 z  x1 p2 q    super.buildActions();
; q0 ?6 Z) E% }* J    ) e2 i3 x* o  s
    // Create the list of simulation actions. We put these in+ m  B- m- ^  u4 V) v  C! D  y2 A, Q
    // an action group, because we want these actions to be  k9 g* K' l$ P2 C! B5 s
    // executed in a specific order, but these steps should
( I- m& C' G8 Z' S# a    // take no (simulated) time. The M(foo) means "The message% M: _: ~4 ]+ Q0 {
    // called <foo>". You can send a message To a particular
2 m- y& y/ B9 x    // object, or ForEach object in a collection.
! `5 b" S$ K! X: Y+ x" }        
/ C$ h) y9 q* O4 f    // Note we update the heatspace in two phases: first run
7 v+ }$ q; x4 k1 e  G7 c    // diffusion, then run "updateWorld" to actually enact the
. k9 K  n) h$ H: F    // changes the heatbugs have made. The ordering here is# L7 P7 R0 i, g. u. q' ?5 c
    // significant!
" y" S( [% M8 u        
5 w  R# P$ R1 B    // Note also, that with the additional
3 ~$ D. p( Q  `    // `randomizeHeatbugUpdateOrder' Boolean flag we can7 \  N5 B( y! v( D0 `( A# d
    // randomize the order in which the bugs actually run
! B8 X: A6 ]9 `9 l) Q( H: k) V    // their step rule.  This has the effect of removing any
' |( F- B6 Z  f+ b) B& w    // systematic bias in the iteration throught the heatbug4 v4 V. a0 z6 P0 \0 d
    // list from timestep to timestep, Q4 |2 M) u! D8 Y3 o
        
/ {- U5 ?) M; v- i1 o. N, T    // By default, all `createActionForEach' modelActions have. o, d- S$ c/ `0 l( Y2 {
    // a default order of `Sequential', which means that the
2 C1 y& U, u6 T9 ~3 T# W& r) o    // order of iteration through the `heatbugList' will be6 F- [2 L4 r( P6 u1 Q
    // identical (assuming the list order is not changed
) F# c) p6 Y: |3 p+ I: G4 r    // indirectly by some other process).6 w' o- ~: \9 H6 K' n
   
# B" ~$ @1 Q& w6 T' V0 N    modelActions = new ActionGroupImpl (getZone ());
) q" p- T0 f6 w% z' a# ?8 P& t  d, m% q2 _6 t- H6 n: H  z- w- n
    try {
( g7 j1 C9 V2 z- J9 z      modelActions.createActionTo$message$ e, C! K4 X# R" }1 U2 j, {7 p
        (heat, new Selector (heat.getClass (), "stepRule", false));+ c  z( l& j! G9 N. |* `& z. Y4 a
    } catch (Exception e) {
$ w6 s: l$ r4 Q+ f/ ^$ O0 p      System.err.println ("Exception stepRule: " + e.getMessage ());
2 c' C2 L* A" M" M( p    }/ C. N  B6 x* F  Y6 u! x9 K' o
6 ?8 ^) ^6 C, D% o! U" r0 K1 j' s
    try {
% J2 E4 Y* \7 p9 I      Heatbug proto = (Heatbug) heatbugList.get (0);
( h  ~1 D& G; E5 R& U      Selector sel =
2 g, ^( M# b& [# C0 s. I: ~        new Selector (proto.getClass (), "heatbugStep", false);
* Q# Y7 A( s2 g9 k) M      actionForEach =
( H& t- B' e) i# G( i+ b        modelActions.createFActionForEachHomogeneous$call
9 q. B6 M" X( y9 ~0 _' x# e        (heatbugList,4 q; P* s3 D' H
         new FCallImpl (this, proto, sel,0 b; y% X9 o& p; o. f; A" N
                        new FArgumentsImpl (this, sel)));
8 w$ e) B* J: _& p* E    } catch (Exception e) {# H" B; p( G" t) t( }8 d, I/ U
      e.printStackTrace (System.err);" M# s8 J+ G- x+ n
    }
3 f3 Q( ~$ z) C" x0 u% a+ }   
7 [- s4 b$ @. F5 x    syncUpdateOrder ();) J5 H/ d  v( J7 H% f! x( j; R

3 {; S  @, v7 }2 e) A' X- o' P3 i    try {0 q9 @8 [" P  M7 |% w" `
      modelActions.createActionTo$message 7 o# C, W6 ]# y( j- n
        (heat, new Selector (heat.getClass (), "updateLattice", false));! B1 l3 o& f3 H4 Z) }9 w1 y4 r/ \
    } catch (Exception e) {8 j0 W, D9 W# N% ?$ L) v! j: ?7 c
      System.err.println("Exception updateLattice: " + e.getMessage ());8 R2 q* y1 I# Q: {8 c
    }
& m* F4 k& G/ n, k  P  n        - H4 s' ^) u5 u4 p% ^/ \# S* p2 R- Y
    // Then we create a schedule that executes the. O; c+ h$ t) G: k$ E: P
    // modelActions. modelActions is an ActionGroup, by itself it$ Y9 n& q% q& \; w# t( Y& u, i
    // has no notion of time. In order to have it executed in
8 ]( `, l& ~% n8 e    // time, we create a Schedule that says to use the. Y" w0 f( _4 i& _' U9 I
    // modelActions ActionGroup at particular times.  This0 g' l9 F6 Z( t' ~4 T% c( ^
    // schedule has a repeat interval of 1, it will loop every
, \3 U" x- ?! I' Q    // time step.  The action is executed at time 0 relative to' G7 p! }. _( `. V( G* f
    // the beginning of the loop.3 ~/ T5 N5 Y2 E& L0 C6 ~
! ?$ n. X( J, ^* ?0 z7 [- O
    // This is a simple schedule, with only one action that is, n# w0 W  C9 g
    // just repeated every time. See jmousetrap for more
2 ]9 ]4 J: |% i# j    // complicated schedules.+ l  a9 G2 c- I2 y
  
, F7 A$ L" y4 U( N7 Q. }    modelSchedule = new ScheduleImpl (getZone (), 1);# t& E! d5 P  y0 I! ?0 M
    modelSchedule.at$createAction (0, modelActions);3 N# v9 T9 L: i9 n* x
        
0 o: N8 `# w5 j& Q( r- z    return this;6 K; m" t! G9 _0 G' P1 e
  }
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