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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:
% @; R6 D5 _# x- M8 Z6 S3 a* p+ W5 ~1 ^; t
public Object buildActions () {) ?! L3 C- o1 [( X$ _
    super.buildActions();3 t+ q$ o' F( \7 e
   
. \* z0 C3 ^9 \5 M9 i  r7 M    // Create the list of simulation actions. We put these in# j- G, l7 @# T4 x% @; n
    // an action group, because we want these actions to be. K% L! g: g8 b
    // executed in a specific order, but these steps should. l) I) l6 Y3 Z3 R# D" H
    // take no (simulated) time. The M(foo) means "The message! a5 T2 F' i* V" n+ P8 G
    // called <foo>". You can send a message To a particular
8 ?3 ]" r1 z- P1 j: Z. `# w7 M    // object, or ForEach object in a collection.
& X6 w2 \/ }+ H          \% |9 g; g# N; t% b
    // Note we update the heatspace in two phases: first run
- e# ^; j/ Y7 n0 B; }: d    // diffusion, then run "updateWorld" to actually enact the% h. H# ]' B" Z8 @% v# P
    // changes the heatbugs have made. The ordering here is& F6 Z3 T5 }3 ^3 O" H6 v) F  o
    // significant!
. E5 q  h: |+ z& O; R* i8 C        9 c1 _7 B8 A, i1 ?( }+ [% \
    // Note also, that with the additional
$ |: T/ u, Z2 x! a    // `randomizeHeatbugUpdateOrder' Boolean flag we can
$ S) V: G3 U! Z    // randomize the order in which the bugs actually run- k  k8 k1 x& J* Z5 n# }  \0 K6 y
    // their step rule.  This has the effect of removing any
+ i5 o2 G1 G% ~0 Q% t) q& ^    // systematic bias in the iteration throught the heatbug: U# E% X: i, N; G5 A$ Q
    // list from timestep to timestep
" \; I. e/ C/ I, s. x        
9 P7 c/ p$ p# O4 Q* O, p0 \    // By default, all `createActionForEach' modelActions have  X$ @9 R0 y2 g7 Q/ H8 A1 Z' m4 p
    // a default order of `Sequential', which means that the
0 a1 L4 \$ ^$ a/ u2 ?- ^9 p6 R    // order of iteration through the `heatbugList' will be' J+ r0 _' E) [4 L; ^: E4 W5 i: X
    // identical (assuming the list order is not changed
7 K/ ?4 H2 w. L9 s+ i    // indirectly by some other process).
4 ?$ F( ~2 X" b5 o5 l/ k0 v    5 ^" M% I% A7 I
    modelActions = new ActionGroupImpl (getZone ());
' D) R# {+ h" V  g3 f$ J- I, t7 a$ x3 [; w$ F$ U5 a$ I1 S$ B
    try {
" }+ H. A/ z7 \# p* K7 m      modelActions.createActionTo$message
8 A+ o; h1 W, _; G2 a' {        (heat, new Selector (heat.getClass (), "stepRule", false));
7 b: w. I$ ~% V  J  m    } catch (Exception e) {! P/ f) e1 v+ U9 U- y2 E
      System.err.println ("Exception stepRule: " + e.getMessage ());! C0 y/ q1 D  E) X, `
    }
1 p! d/ u$ J, r( M! H3 S$ q( L5 o# V( b& }: Z0 U
    try {0 C4 o" q" M3 `! o. A% B
      Heatbug proto = (Heatbug) heatbugList.get (0);) Q/ m% ?% X+ ^0 |$ D' r8 e
      Selector sel = ! B; ]3 F, V! _  q  `
        new Selector (proto.getClass (), "heatbugStep", false);8 t; {+ K) R( f# m1 W( I1 W/ \; c
      actionForEach =
# I+ k+ E8 e3 q  T8 A3 I8 ^: V        modelActions.createFActionForEachHomogeneous$call
6 h8 G% A6 `4 M/ R" U        (heatbugList,
1 r& h0 J; H( o1 y         new FCallImpl (this, proto, sel,
$ A# U3 \9 J) i- L) U; g                        new FArgumentsImpl (this, sel)));
2 r( b4 F: B% L9 I    } catch (Exception e) {1 r' L( }9 T. _- m0 J. A1 @) W
      e.printStackTrace (System.err);
. a9 [& l7 ^" R! }* d+ k. J' q    }, o0 w6 a; \1 {# ]2 a4 n- s7 d+ ^9 o- I
   
/ ]6 w7 Y3 Y* Q9 |    syncUpdateOrder ();
  h& r  d: G; S2 V9 s+ N) n5 B- ^: M" c
    try {5 G7 z1 |. x" [9 s
      modelActions.createActionTo$message 9 V' N: V: q2 y* a
        (heat, new Selector (heat.getClass (), "updateLattice", false));
0 V  Q3 S. G7 Q/ w! V9 ^    } catch (Exception e) {8 B! i7 w+ p3 O4 A% p; X% F: A
      System.err.println("Exception updateLattice: " + e.getMessage ());$ p( S7 c2 c) o6 t1 r
    }$ ~& z2 t! n$ O+ o3 ~6 ^$ M3 V
        2 j( a& V" |( L" ?" u* r
    // Then we create a schedule that executes the4 x0 H+ l: t* g5 |5 i$ p
    // modelActions. modelActions is an ActionGroup, by itself it% X  |+ j( P, @" B" |5 A
    // has no notion of time. In order to have it executed in8 b* Q* ~8 O# q( m( m, R* z
    // time, we create a Schedule that says to use the
. q+ Y' g& @& J" b" i+ \" W! H    // modelActions ActionGroup at particular times.  This
. d: a* ~( a2 X    // schedule has a repeat interval of 1, it will loop every% g- n: }( |+ E  ~
    // time step.  The action is executed at time 0 relative to
) J5 n+ L+ N$ a- t0 _    // the beginning of the loop.
" o1 x; b3 A2 h9 ^5 S$ z6 ]* i$ ^& O: D2 F3 @& R+ z0 D/ y
    // This is a simple schedule, with only one action that is6 e2 ~! B; g: [# e: \3 k% s
    // just repeated every time. See jmousetrap for more/ z6 r8 h7 l) q8 W* P9 K5 |9 r
    // complicated schedules.
; j& x+ O* ]+ O( p. K$ [  , W: v2 A" _7 S$ M8 Y' q
    modelSchedule = new ScheduleImpl (getZone (), 1);8 `+ r$ r) y/ t
    modelSchedule.at$createAction (0, modelActions);
4 C: l5 G8 L) I/ `- D        5 M" P6 U% h' y
    return this;7 W) O  n4 ?6 t& Y7 {3 i" P
  }
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