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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:7 ~* E+ p9 F6 u' r/ [* K

) y5 s2 M; M6 N  ` public Object buildActions () {
9 ]4 g" Z" ^9 Y* A( d) p: S    super.buildActions();5 i% B& Z: C8 O9 i# V) ]
   
# c: H7 Y1 k  G( F    // Create the list of simulation actions. We put these in
2 f' Q$ }' r% s    // an action group, because we want these actions to be# n. D$ f) n9 b+ b* K  d3 W
    // executed in a specific order, but these steps should
7 C# k/ W5 p( @    // take no (simulated) time. The M(foo) means "The message
" A7 v: J, q, G* w; \2 L6 @    // called <foo>". You can send a message To a particular0 ^) }' Z, E/ b; M
    // object, or ForEach object in a collection., _& W0 M4 F8 R. M: L, r6 t
        
- H$ \% [+ E6 R, k  v2 Y: O    // Note we update the heatspace in two phases: first run
: K# d- P% D$ [+ ~% p    // diffusion, then run "updateWorld" to actually enact the
" W5 [" I/ |# \; T" V    // changes the heatbugs have made. The ordering here is1 C- ~  I3 h& ?% u6 a; p  ^8 a
    // significant!# o$ k8 E1 K1 E
        
. c/ C" W+ D- O1 G- U2 J( A; {, Q    // Note also, that with the additional
) q) c/ ~3 E5 R- A$ ?& m    // `randomizeHeatbugUpdateOrder' Boolean flag we can
. d  n' }- o1 c) u  }    // randomize the order in which the bugs actually run, u  j' j. O1 h4 _
    // their step rule.  This has the effect of removing any2 {: f& x% Y( s+ I
    // systematic bias in the iteration throught the heatbug
  X: U. d! w& R3 T    // list from timestep to timestep, F! L, p6 W# M$ c! X9 K
        
# C% Y+ e4 U. A1 j6 w. y3 c# ~    // By default, all `createActionForEach' modelActions have
) q2 G# K: i& C% W    // a default order of `Sequential', which means that the+ Y% h  J  i/ D+ d% u6 `) d! F
    // order of iteration through the `heatbugList' will be
, @  x2 f; a. x1 c% h# j    // identical (assuming the list order is not changed. B$ L  ]* q* I5 K, ~5 L% E$ ~. B5 V
    // indirectly by some other process).
4 H! l8 o& `; K% M  C$ o   
& Q, r: Y; ^, l# m8 l) ]4 Q& M    modelActions = new ActionGroupImpl (getZone ());5 l% i3 [) H  {  L  h
! _0 z: }0 m. D5 e: [
    try {6 J: z- P3 X' F2 `( c
      modelActions.createActionTo$message+ s1 c. Q# N/ U8 A- |4 Y' Z
        (heat, new Selector (heat.getClass (), "stepRule", false));
  b* J+ R$ M9 d5 x& @    } catch (Exception e) {" X$ O# m3 [6 n( W) O! H  l, @
      System.err.println ("Exception stepRule: " + e.getMessage ());
  \: j* o6 s& }% [    }
% ?" \; P1 P, R1 D0 D9 K( T2 z; n' [. H- ?# w' N$ j* L1 M+ N' A* L. o6 Z
    try {+ o+ z( ?" S3 @. |7 D
      Heatbug proto = (Heatbug) heatbugList.get (0);
/ Y+ k+ J* s8 v# [2 k8 U      Selector sel = 0 s0 g2 [6 `; ]7 C2 f
        new Selector (proto.getClass (), "heatbugStep", false);  `1 C; L3 Q7 O3 L# I4 ^+ \" o
      actionForEach =" P* ~8 i. ?- f# E) ^' ~
        modelActions.createFActionForEachHomogeneous$call
1 ~! H  t  A8 u4 O/ C        (heatbugList,
# J0 M  |8 M8 @         new FCallImpl (this, proto, sel,; V; A2 {) v8 W! d0 S
                        new FArgumentsImpl (this, sel)));! e1 H5 @. f: d  }+ B! {8 k
    } catch (Exception e) {0 R4 ]# X) `3 B8 q; P1 ~
      e.printStackTrace (System.err);# y5 c; i" J% z2 `) ?
    }9 _$ q; X* C& V) p
    ! m, ~7 S+ N) X
    syncUpdateOrder ();
' S5 E# D) A+ X6 {% E) p1 p9 `; y% D. v" P
    try {8 \% A7 M2 v# m# K" y" {& J
      modelActions.createActionTo$message
( n6 E: l" E% n7 M4 r6 X. x! M        (heat, new Selector (heat.getClass (), "updateLattice", false));! A% }( d8 d0 [- G* k
    } catch (Exception e) {
. V+ M$ M' A. V% Q      System.err.println("Exception updateLattice: " + e.getMessage ());
8 \& H& R+ L1 L2 W- I/ ^    }2 D5 B8 z/ _) ?0 ]( M
        # O  I8 n+ L7 z) J; X2 ?# o- f" I
    // Then we create a schedule that executes the7 n! j; D8 [$ K  [) ?
    // modelActions. modelActions is an ActionGroup, by itself it7 W- H+ {5 n# B8 l
    // has no notion of time. In order to have it executed in
# p! V4 b6 v2 U7 Z& s8 C6 v) x1 i    // time, we create a Schedule that says to use the
3 m0 U2 i1 q& W    // modelActions ActionGroup at particular times.  This/ k& H9 W9 h" I
    // schedule has a repeat interval of 1, it will loop every6 I! w3 O8 B: N, c; M
    // time step.  The action is executed at time 0 relative to
% B( Q! t" w  P( G- l/ m9 X    // the beginning of the loop.
  n+ `6 o6 `( `. H6 v1 C8 l8 Y+ ^: X: g
    // This is a simple schedule, with only one action that is3 |. Q* P, B  `: D6 ]9 [( s
    // just repeated every time. See jmousetrap for more0 V1 K/ h% j" Z; T1 ~" [
    // complicated schedules.
+ H* k: V+ M$ d  
* |, D" |  Q" S( F' B; x    modelSchedule = new ScheduleImpl (getZone (), 1);
6 ?+ B9 d2 @5 ]. N' S) y) b    modelSchedule.at$createAction (0, modelActions);* D. N8 F: i$ p9 H; N
        
1 b9 j7 J% J- ~: o    return this;4 P; E( ~* k' A8 {( |# r
  }
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