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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:4 _+ j3 g8 X) ?/ x
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public Object buildActions () {% e; _  j0 \: T/ h; W  V
    super.buildActions();
$ u* m0 y9 O: L    ! x4 `# \# C2 E- \) @4 p
    // Create the list of simulation actions. We put these in
# Z" J( R& F5 ^6 e    // an action group, because we want these actions to be; t6 J- ~( l  N
    // executed in a specific order, but these steps should- Q1 K# @" X8 w- [6 A
    // take no (simulated) time. The M(foo) means "The message5 z9 E! h) b" g: r! q7 D
    // called <foo>". You can send a message To a particular
6 e# b3 O3 @6 m/ b    // object, or ForEach object in a collection.
# ]; L% _- ^, \9 |; u        + |0 ^# r! }8 J7 Q  K
    // Note we update the heatspace in two phases: first run
! K4 t. b* B& l% \* C    // diffusion, then run "updateWorld" to actually enact the
5 r' P2 |7 F5 m* N: D    // changes the heatbugs have made. The ordering here is
3 o! @9 T% ]% s  f) u    // significant!2 k" M& ~+ d, I' n5 i( n8 A0 Z5 r
        8 W0 B0 I( a4 X6 L) A+ F
    // Note also, that with the additional
9 a8 Z6 G1 s' t% ^/ a% s' m( S    // `randomizeHeatbugUpdateOrder' Boolean flag we can
) {& E$ w' `7 `    // randomize the order in which the bugs actually run
1 b2 O2 a! F- x! k( q2 Z    // their step rule.  This has the effect of removing any
7 o2 r4 x* @% x( C/ }- D    // systematic bias in the iteration throught the heatbug6 N+ R5 {6 I( U" A
    // list from timestep to timestep" N: a4 T0 U) D" T
        
) f8 i" }. _( c( _8 ]5 y    // By default, all `createActionForEach' modelActions have( V+ C9 J# a+ X/ P/ L$ m+ W
    // a default order of `Sequential', which means that the1 Y8 n; b5 L3 W* F' {5 g+ Y
    // order of iteration through the `heatbugList' will be# _1 ?0 x9 i" |/ [
    // identical (assuming the list order is not changed3 y8 M/ O8 u9 j1 L& `% P
    // indirectly by some other process).3 R6 @  L' [- V3 z* o3 |
   
% G7 l. J( R5 t    modelActions = new ActionGroupImpl (getZone ());
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    try {; z* l; i5 y0 O* M
      modelActions.createActionTo$message0 z( Z8 y7 B: q) n7 Q
        (heat, new Selector (heat.getClass (), "stepRule", false));3 Y& `+ d" I+ W( p  H: p* G
    } catch (Exception e) {' h  f% S0 V; x, C# U& I7 D, S, l1 i9 C
      System.err.println ("Exception stepRule: " + e.getMessage ());) `. j: y% a  `" J
    }' v9 [5 S& K& I  |3 E: k
0 c, o5 Q( \8 {7 r
    try {
, ~! s' D* c( ?7 r# I" Z      Heatbug proto = (Heatbug) heatbugList.get (0);) ~, k" F; p' f2 r+ x
      Selector sel =
# c4 v- [4 R" q. E$ J        new Selector (proto.getClass (), "heatbugStep", false);" I. \! |- G: J
      actionForEach =5 X3 ]7 t6 `5 R
        modelActions.createFActionForEachHomogeneous$call
" I8 u8 J; Z6 O+ B( e8 ?        (heatbugList,+ o! v1 D, m) E$ g  U
         new FCallImpl (this, proto, sel,
2 l' B# y# F3 q5 O7 s) j                        new FArgumentsImpl (this, sel)));
1 o& A6 o. j" t; q) b7 w    } catch (Exception e) {
0 A% L  G0 j( e4 z0 H. f1 a' O/ v      e.printStackTrace (System.err);
6 ^, ~3 |. h) |% Y$ |% g) ~3 V" R    }
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    syncUpdateOrder ();
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    try {
1 H; x* t1 W( m& d( J# |      modelActions.createActionTo$message 7 E. y  q6 _6 H. k, u; A3 S
        (heat, new Selector (heat.getClass (), "updateLattice", false));
! f8 u7 z% c+ R& }% ?3 t    } catch (Exception e) {
* j6 G* Y9 M6 ~: x/ S+ C      System.err.println("Exception updateLattice: " + e.getMessage ());$ n1 t6 C$ N0 a, F1 o
    }/ K$ ~; Y0 [+ H. `+ O, `. T
        2 Z% g4 U; b3 Y) J0 p2 ?* W) {
    // Then we create a schedule that executes the; u* m  N) b: \5 m9 c! u" L
    // modelActions. modelActions is an ActionGroup, by itself it8 a6 N; a: n" M7 t) q/ j' `
    // has no notion of time. In order to have it executed in" Z5 m" w; L2 B: E8 _' x
    // time, we create a Schedule that says to use the
: g' M; k7 |  V7 Q. M    // modelActions ActionGroup at particular times.  This
  X& U5 C8 Q' \! B( @) b    // schedule has a repeat interval of 1, it will loop every# |$ j8 r# @2 i9 }, X" G* j
    // time step.  The action is executed at time 0 relative to
0 A# _; F" v& T: ?# x    // the beginning of the loop.2 l, j  \, D! b6 A& C; ?% Z4 b

9 _0 T# a( @1 v9 w( n+ d1 c    // This is a simple schedule, with only one action that is
$ _& \8 Q' i, \    // just repeated every time. See jmousetrap for more
' @/ N! h( S- x) I    // complicated schedules.
$ w7 J& n' y5 Z( d( e  2 c+ N# `5 s. i8 P3 ~7 _$ \
    modelSchedule = new ScheduleImpl (getZone (), 1);9 g$ I* T6 c8 I( [3 ^
    modelSchedule.at$createAction (0, modelActions);
+ T" l/ p) I' E1 Z        7 y5 N) D1 V3 ?5 o3 h2 E
    return this;
. q' Y) ?6 Q7 z  w: K5 s  }
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