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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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public Object buildActions () {: n# T  H& ~( j5 T
    super.buildActions();
# j6 Y) z9 S. G$ Y   
8 ?8 p# C! R$ K- y. f2 W, u    // Create the list of simulation actions. We put these in
2 l7 {$ P6 `. g" y5 j2 D% n    // an action group, because we want these actions to be
, l# v, E/ i+ L6 u    // executed in a specific order, but these steps should0 F4 O6 H: H/ C
    // take no (simulated) time. The M(foo) means "The message! |, s3 Q/ Y' `9 ~& Z
    // called <foo>". You can send a message To a particular* j+ W" q$ G& v5 v( `; c
    // object, or ForEach object in a collection.
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    // Note we update the heatspace in two phases: first run! J$ {% d$ c% V: Z, f5 Z+ r1 t/ E
    // diffusion, then run "updateWorld" to actually enact the
# e9 N0 j# p: y; x    // changes the heatbugs have made. The ordering here is# X! G1 v) H5 x; B1 W) s
    // significant!" m% F- w7 W( h4 {9 D, Q! c
        
, H  ^+ }" W+ T, G8 _. j    // Note also, that with the additional" r# o5 n  l% f' ~9 q
    // `randomizeHeatbugUpdateOrder' Boolean flag we can5 M) v4 I# c/ i0 i  c+ ?" e
    // randomize the order in which the bugs actually run" A' _! A+ u& ]# w0 @0 d7 I! w8 z
    // their step rule.  This has the effect of removing any
3 k& A8 b5 {, d7 c5 P    // systematic bias in the iteration throught the heatbug2 Z  D' l7 J* k* k+ o2 u7 G, r7 w/ e9 L
    // list from timestep to timestep
+ M" H& K: c$ n; C( @  D4 O        
" ~/ [4 t! P% N; o# B    // By default, all `createActionForEach' modelActions have( F8 ^1 w9 j6 g
    // a default order of `Sequential', which means that the
0 t2 `3 g9 P/ i4 f2 {' _( f% C    // order of iteration through the `heatbugList' will be
$ h3 ^) q6 z8 g" R+ ^    // identical (assuming the list order is not changed' c; n( y% \4 j' F" {5 P7 r2 _
    // indirectly by some other process).' J( e/ ~8 B9 q4 X2 P/ [' n+ ^$ t
   
: g$ Q8 R" {8 h" l/ _    modelActions = new ActionGroupImpl (getZone ());
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2 Q# `& e# d& U    try {
4 R: n# W2 b  ]+ P) |      modelActions.createActionTo$message
1 e; }. o1 U# Q+ |0 t0 }        (heat, new Selector (heat.getClass (), "stepRule", false));$ u1 S* S5 I: f. y# q; v  o
    } catch (Exception e) {& d2 j3 B' ^; j' _
      System.err.println ("Exception stepRule: " + e.getMessage ());
- D- _* X  ~- N6 D+ u, Q8 S7 X    }
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1 k" N1 g/ S2 W3 Y    try {' [& R& M& P6 [  }4 B0 Y: H
      Heatbug proto = (Heatbug) heatbugList.get (0);) M7 ^1 M4 v7 A# {: e7 P: H# h! t
      Selector sel =
: }' K9 G. w6 A$ |        new Selector (proto.getClass (), "heatbugStep", false);6 H& ]9 Z4 q1 k' V  ~
      actionForEach =+ m/ u8 |, e! _8 _' W5 A
        modelActions.createFActionForEachHomogeneous$call
( n( Q& {1 `& k, O0 i9 t" F        (heatbugList,
: m% T: A( \+ Y& D( A' x         new FCallImpl (this, proto, sel,6 I# s7 }' L) K  G& r/ R& h0 m
                        new FArgumentsImpl (this, sel)));1 s7 E# ?$ G. j+ r& K
    } catch (Exception e) {  g9 N, y  v: C" A8 x5 \* M) F
      e.printStackTrace (System.err);
5 k3 R3 L' p) `8 i  e5 ?4 F* p( I    }
. ]$ g, V; H+ Y4 M2 c" v   
' [# `; _$ b! Q    syncUpdateOrder ();
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    try {% A2 I7 I! j) t
      modelActions.createActionTo$message 6 h! l; f2 J5 l# W* {
        (heat, new Selector (heat.getClass (), "updateLattice", false));# b! t' o! S) D* q$ ]& k. n
    } catch (Exception e) {1 N/ c( s( s  t2 s) h) O3 Z
      System.err.println("Exception updateLattice: " + e.getMessage ());
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    // Then we create a schedule that executes the; w; b/ ?; `# {6 ^
    // modelActions. modelActions is an ActionGroup, by itself it: \3 P$ @! B0 b. i1 N
    // has no notion of time. In order to have it executed in8 s: Z7 ?  g$ ]5 g
    // time, we create a Schedule that says to use the
% U3 k4 i( u; V0 z' U. d$ I; v1 K. r    // modelActions ActionGroup at particular times.  This) x8 K. E' O! q& U4 ^6 G: k
    // schedule has a repeat interval of 1, it will loop every) k: U+ u1 n' d  E. j. j8 t
    // time step.  The action is executed at time 0 relative to2 }, T2 j6 w1 r" O
    // the beginning of the loop.5 i3 ?8 R, s. j( ~9 F8 ^
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    // This is a simple schedule, with only one action that is
# z8 U) u8 w! p& V8 O: Q* _    // just repeated every time. See jmousetrap for more
, V7 E) W2 A. d; ~' @; ~8 u$ o    // complicated schedules.
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    modelSchedule = new ScheduleImpl (getZone (), 1);5 y0 {3 ~: t* H1 M7 }
    modelSchedule.at$createAction (0, modelActions);
% P; x1 u' \9 I        
2 m. G/ Q1 E# u( C5 x. ]7 s$ d- G( f* `    return this;
: h, ~% s! U* T8 @2 B  }
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