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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:
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# Q" P$ g8 z! D  X* W2 U public Object buildActions () {0 g; s9 m0 {* [! w, h, z& m& Z9 k
    super.buildActions();2 q  x. \. a0 L5 g- [% z
    % a0 r4 B" |/ L( N/ a
    // Create the list of simulation actions. We put these in5 `1 Z6 Q' i; u* ?7 `9 C- s0 ?
    // an action group, because we want these actions to be! I7 m+ f5 H2 [! X
    // executed in a specific order, but these steps should; o$ q; R! M" f& Q8 V- i4 C
    // take no (simulated) time. The M(foo) means "The message
; k1 A6 o0 G8 s, b    // called <foo>". You can send a message To a particular7 s& A; O5 z6 ]; ^! `0 U& w
    // object, or ForEach object in a collection." E$ }, f- n% E2 V$ n- b
        
6 ?2 F5 U% _& T  g    // Note we update the heatspace in two phases: first run  a* S2 j+ B2 R4 o
    // diffusion, then run "updateWorld" to actually enact the8 m1 h/ @" C! P3 ^6 ?# c, u; l
    // changes the heatbugs have made. The ordering here is
) Y1 p2 a& b. x" Z3 B    // significant!# n1 p+ K& A7 @: G, B
        
! f4 ~* ]! T* S) w" J0 [$ A3 p    // Note also, that with the additional
: o3 `9 s: }$ q, q& G$ {, V    // `randomizeHeatbugUpdateOrder' Boolean flag we can" i% b2 r! b2 R3 A! s
    // randomize the order in which the bugs actually run
0 z) Z2 J0 C. T; g- U    // their step rule.  This has the effect of removing any. _, F/ t9 ?+ j9 y& B" W
    // systematic bias in the iteration throught the heatbug
% Q1 C8 F* h) _! h    // list from timestep to timestep
( M  t8 Z( S5 X8 b) J        
: C% H7 ?$ Y+ }0 R; @9 W    // By default, all `createActionForEach' modelActions have
# E+ }0 c' a3 D: {) [    // a default order of `Sequential', which means that the
' A9 V8 L5 q- p: g# |) F    // order of iteration through the `heatbugList' will be
& r! E6 X: }$ B; f: ]( I$ {    // identical (assuming the list order is not changed4 r/ U( p* B9 b9 Q2 ~
    // indirectly by some other process).2 Y8 \/ J- D0 ~! b! b
   
6 C( M. Y( D) I% Y% b    modelActions = new ActionGroupImpl (getZone ());8 O6 ~0 x. U" W) e% A  d% }! T
0 O8 R/ N# h- P- s: V
    try {+ H/ f2 E( ?4 e4 r
      modelActions.createActionTo$message8 M) v3 q* {( l
        (heat, new Selector (heat.getClass (), "stepRule", false));) Z( c0 P, \$ ?0 \4 G+ [
    } catch (Exception e) {
9 J2 I) M5 u- d& y* w      System.err.println ("Exception stepRule: " + e.getMessage ());
- j# Q" g) h# r! F4 R; ]% Q( F    }$ F7 C. b8 K% E* ?; ]
  A& j/ K$ ^, E* W
    try {3 R- q8 [2 ~) {  b! D1 Q0 D
      Heatbug proto = (Heatbug) heatbugList.get (0);3 i, U6 T0 E1 x6 D9 s
      Selector sel = 9 |9 w9 L$ v& F4 Y
        new Selector (proto.getClass (), "heatbugStep", false);
0 t: e! w9 D" B% z; J6 M" |1 b0 L      actionForEach =
0 i1 @9 [8 `7 m        modelActions.createFActionForEachHomogeneous$call
/ m" H8 f! `/ K# G1 ^( v  y  B' G( g        (heatbugList,: N. G7 ^' o+ q
         new FCallImpl (this, proto, sel,# U+ k5 Q  b& _. R, Y4 U8 T
                        new FArgumentsImpl (this, sel)));6 l* J6 l, N1 ~6 V1 P! I
    } catch (Exception e) {& U: ^% [. \" u  u" D5 X& a' D4 D
      e.printStackTrace (System.err);- B9 j0 T  z" T" n- p  _, D7 l9 n" H
    }4 q; \' `: H# C* x: x
    # s0 |  ^( X& K7 T
    syncUpdateOrder ();: a: X, w% Z2 U) G) r$ a( f' g

5 n9 @: ~. o  C, V" K. h5 T    try {9 z2 B& s  I( E8 x' D  |! K9 @
      modelActions.createActionTo$message , B: c# Z. y5 @, G1 T
        (heat, new Selector (heat.getClass (), "updateLattice", false));6 ^4 l6 ]/ A# L
    } catch (Exception e) {7 i- ^" t4 a3 w9 j' U
      System.err.println("Exception updateLattice: " + e.getMessage ());  V5 u" Z; h6 k' `) r  `
    }
, R5 Q8 ?: z1 Q, A) m4 W          t8 ~( s6 B5 p* e
    // Then we create a schedule that executes the
# w- s8 _8 z6 g1 D, o    // modelActions. modelActions is an ActionGroup, by itself it
5 {6 a) K) e1 Z    // has no notion of time. In order to have it executed in4 \: s$ Y7 @4 ~
    // time, we create a Schedule that says to use the
6 t( x0 ~, s$ N# t# _9 X0 y: D    // modelActions ActionGroup at particular times.  This, u! G9 @5 y5 y1 ?  ~
    // schedule has a repeat interval of 1, it will loop every
5 e1 z  t) C+ W0 O8 O& ~& w8 \9 Q1 C    // time step.  The action is executed at time 0 relative to
/ j3 M$ d+ c' c6 l% a" e    // the beginning of the loop.
3 r/ _' l$ W- r4 t# p- F2 M4 j2 v- A+ \* N* w: S' j/ h: D2 G
    // This is a simple schedule, with only one action that is) R- h2 U4 c$ }" i
    // just repeated every time. See jmousetrap for more
: k) w3 r* i% A9 t0 T    // complicated schedules.
7 t& @, L- [, ~6 _  + q5 _& Z6 `) i+ z9 e
    modelSchedule = new ScheduleImpl (getZone (), 1);- Z9 k6 e5 m6 w+ h' j: Q3 z
    modelSchedule.at$createAction (0, modelActions);
% G! s! e) w* a! ^, O( }! Y        
: z. R% z: X. ~% a. R9 L" l    return this;
/ o3 u6 X4 E  w) s# ?( c  }
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