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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:
  D6 J' e8 v+ }) [1 C8 I  }- @/ ^( D% \5 r' `2 @. j1 w' J7 j* x: v% B/ W3 x
public Object buildActions () {
% Y* |+ b) O1 a+ v  t% z$ Y    super.buildActions();. \3 R2 R7 x6 k$ m; P; j
    " f4 g3 O. t3 S) ]
    // Create the list of simulation actions. We put these in
5 b0 b4 m0 _5 }0 B" v8 O" u1 l    // an action group, because we want these actions to be
# k- A5 K! M  j    // executed in a specific order, but these steps should
: g" p; s6 [* ^3 V. v    // take no (simulated) time. The M(foo) means "The message
7 c( ^5 F/ M- S9 P    // called <foo>". You can send a message To a particular9 K) n/ {! J% q3 J. G. l
    // object, or ForEach object in a collection.
3 ^9 V) y' N/ D  N' ^  }        + b* Z5 U9 |" w# \3 [0 ~
    // Note we update the heatspace in two phases: first run* c) E& M3 D' h
    // diffusion, then run "updateWorld" to actually enact the
3 N. d7 H4 b) J* t+ z) t    // changes the heatbugs have made. The ordering here is
; m2 J4 X  a; R% B' Y    // significant!5 x' ]0 X$ s- @  g' v
        ; U5 ~/ x7 L8 z, i7 J' G& h" Q
    // Note also, that with the additional4 p4 A0 s" @1 }* q* Y4 q4 g. B5 A
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
: [6 s6 k$ I- y1 H. ]+ D5 q    // randomize the order in which the bugs actually run5 l  Q; @7 I5 m$ G, q
    // their step rule.  This has the effect of removing any. I, l  y# Z7 q! g5 l% K* h( ^/ A
    // systematic bias in the iteration throught the heatbug- w7 t7 G4 U2 Y/ o: I7 w" K
    // list from timestep to timestep
: ]7 L% t( Y4 l0 y% O& @* r0 W# n# R& s        # T6 a1 E8 h! }$ Q
    // By default, all `createActionForEach' modelActions have
: x# o! a* \% i2 i% b: F    // a default order of `Sequential', which means that the2 F& Q& o5 C) k$ `: Z) D2 w8 n! r& r4 {
    // order of iteration through the `heatbugList' will be/ `  g1 q6 r& Y7 q  \% e+ t
    // identical (assuming the list order is not changed
4 r" I- L& E; z( j, [! |0 I    // indirectly by some other process)." Q' ?. o! k7 J0 M
   
: i% R. T3 G4 Y2 A: A    modelActions = new ActionGroupImpl (getZone ());
' X/ Q5 w& h% r
+ o/ J$ n# P& T* y& N    try {
8 _) U# l9 U4 r7 L4 s& g1 B( o( h      modelActions.createActionTo$message
8 k; [- _7 |5 p0 N. l        (heat, new Selector (heat.getClass (), "stepRule", false));* O& f: f  c5 v/ Y2 I+ z8 f3 x% ~) }
    } catch (Exception e) {
  o  C0 N7 t! O" L      System.err.println ("Exception stepRule: " + e.getMessage ());( {1 T" c/ c$ }
    }
* S+ v. ]/ U! I4 u6 ?# P; j. c) K4 _  N+ p' c3 l
    try {4 r  [8 f& D; ?& }
      Heatbug proto = (Heatbug) heatbugList.get (0);
9 e" g) B* s2 a. }, O      Selector sel = 5 q& F; h6 c) f1 H1 [
        new Selector (proto.getClass (), "heatbugStep", false);
8 F+ ?# X0 p0 `1 V+ e3 C" Y      actionForEach =
- _/ k1 e7 ^+ Z2 b$ w        modelActions.createFActionForEachHomogeneous$call
9 f! J# o( T4 t& z1 B        (heatbugList,7 [* S0 r; W2 x+ e5 R. S5 C
         new FCallImpl (this, proto, sel,& P( ]& a0 T% V8 q4 U
                        new FArgumentsImpl (this, sel)));
. W0 j( O( V, x: a$ z1 J    } catch (Exception e) {
( D- l; c: w& N4 O1 i      e.printStackTrace (System.err);
4 O; k9 x  T1 S. ~7 s) o    }
/ \6 N  c+ S" d$ f    1 M6 L  y' z* @1 L- P
    syncUpdateOrder ();
, d0 e. [% J+ ?$ P: v
6 _9 M$ [" q* q/ G/ X+ I( s    try {
! e4 O1 d: @7 Z& l, Y" M/ q      modelActions.createActionTo$message 8 i  S) h4 ~: }( ?) t
        (heat, new Selector (heat.getClass (), "updateLattice", false));; O- t6 G" o+ d& ^& B
    } catch (Exception e) {4 R6 c8 ?- \  [, X3 A0 \5 f' U2 \
      System.err.println("Exception updateLattice: " + e.getMessage ());
* B* [  o. S8 j3 E    }, q3 `5 [7 r9 X" f7 I: `
        8 Z9 @# W. o+ B4 Q. G
    // Then we create a schedule that executes the- v* l: x% O' }
    // modelActions. modelActions is an ActionGroup, by itself it, |! Z4 U" p9 _2 J5 p, q' H/ \
    // has no notion of time. In order to have it executed in3 e6 q7 v. k: T; R, _7 J$ }
    // time, we create a Schedule that says to use the
6 |5 {# v1 J1 k( ^0 B6 J( c    // modelActions ActionGroup at particular times.  This! h5 T0 I9 o# L* V! D# m, @
    // schedule has a repeat interval of 1, it will loop every% O# J9 s, ~- o' X: f
    // time step.  The action is executed at time 0 relative to. y7 s$ S& T  }2 @2 ~
    // the beginning of the loop.
8 j7 `) p+ {: m$ p6 a% k0 Y% Q4 l
! \1 E2 D  L. U0 Y    // This is a simple schedule, with only one action that is- R$ x9 j- U5 a  B2 @; S7 m
    // just repeated every time. See jmousetrap for more  W% E4 D; |6 ^
    // complicated schedules.
& h( Z$ y2 }2 c: y+ f! {  
* n9 w) ^! @3 l    modelSchedule = new ScheduleImpl (getZone (), 1);
" N" y) z% Y. H    modelSchedule.at$createAction (0, modelActions);; n. n! s  [% E' z
        
+ [% ]" ]. v) [, D6 ]5 R    return this;  W& b6 ]/ u( |6 r
  }
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