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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:' c! ?; _2 D  B, l; g  n; A0 s- R
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public Object buildActions () {$ c5 j3 {# S! W4 A* b- V& a/ Q- o: p
    super.buildActions();4 a, J! g8 S2 @- D9 ~/ x
   
9 k! x; d, z5 S- Z- C/ u    // Create the list of simulation actions. We put these in3 p  q7 @4 `# |$ T. }4 F+ C: g& A+ z* [
    // an action group, because we want these actions to be
2 S6 B! d; t8 p7 d/ X    // executed in a specific order, but these steps should
3 G; O% X9 s+ q$ R1 b$ v    // take no (simulated) time. The M(foo) means "The message
# i, z8 B4 `6 ~: m! _( r    // called <foo>". You can send a message To a particular
" _' w3 H0 {5 @+ ^" w( n9 G7 n, K" }8 W& t    // object, or ForEach object in a collection.
: P( Z: h. F3 s% Q# R        
6 V" c9 O' p5 X' w    // Note we update the heatspace in two phases: first run
( W2 R8 }0 b4 \+ V    // diffusion, then run "updateWorld" to actually enact the. P6 \5 v& q& \; M! V2 t
    // changes the heatbugs have made. The ordering here is
+ W, g( I. v: L    // significant!
' Z: d% c4 x- A$ B        " X! Z/ }1 y/ _! T; a" w
    // Note also, that with the additional( A, E1 \# X$ T% M, L" X, l
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
5 M5 k, f' w$ T/ l3 M6 n) ~/ b: v    // randomize the order in which the bugs actually run
/ A" T% |# L& }* r$ k  {$ n0 C    // their step rule.  This has the effect of removing any
7 Z" f. p% d' d/ V    // systematic bias in the iteration throught the heatbug0 ~; @7 A+ X6 T" A
    // list from timestep to timestep
) v9 R9 S1 S. j: n" I& u$ @        % K, D9 }) I8 B/ K' k! Q' x. K. v3 G6 e
    // By default, all `createActionForEach' modelActions have" f& R: t& Z" ^3 C, z
    // a default order of `Sequential', which means that the
0 l7 b8 ?0 z7 l8 I7 b$ s' r    // order of iteration through the `heatbugList' will be
5 p8 @( t' o3 w    // identical (assuming the list order is not changed0 q4 r  W: X  h% T
    // indirectly by some other process).
5 P. R, {+ V% z# g- f. W    . H6 ]. y6 R3 R* y/ j. x8 f9 J0 Y
    modelActions = new ActionGroupImpl (getZone ());
/ N( a  f; [, o, D8 ^0 ?6 }/ f5 L) g% }. w) ?) p
    try {  _& h; _$ w8 F9 i
      modelActions.createActionTo$message
) s3 \% Y& k% V  g& F        (heat, new Selector (heat.getClass (), "stepRule", false));% A; s) R# J( ~& C
    } catch (Exception e) {3 O7 s* F$ g4 s4 L
      System.err.println ("Exception stepRule: " + e.getMessage ());* H+ K8 C! b! l$ u. B2 p1 t
    }
& Z# Y; V% S. c, O
: O( ~; q! l  U0 O6 `    try {: T: V: C" _) o
      Heatbug proto = (Heatbug) heatbugList.get (0);3 b% k- y" f9 Z' [0 E  w$ |
      Selector sel = + A% t# N9 P! F0 a
        new Selector (proto.getClass (), "heatbugStep", false);
+ S. w) [6 Y  e9 k( L      actionForEach =
6 B* |* U1 c0 P1 i4 D- b, T4 P- m        modelActions.createFActionForEachHomogeneous$call
( v# R  c0 f% `! [% o( |5 I        (heatbugList,
+ h8 |" K7 ~: D8 {         new FCallImpl (this, proto, sel,
4 g. ]( T9 ^* L                        new FArgumentsImpl (this, sel)));6 E% p3 x* s8 g8 P
    } catch (Exception e) {
6 Q  A8 o  h- m9 a  v      e.printStackTrace (System.err);5 F/ ^4 l6 [8 {4 X( Y( K
    }
# K) s' }1 J# T6 K, T   
8 r) @$ N* E4 k1 A  l, K    syncUpdateOrder ();
% q8 g$ @: x: K0 }7 `8 o( i" ^( b/ R8 O3 L) e9 D2 i
    try {
. K, `8 |- n7 A1 V5 g" |      modelActions.createActionTo$message
2 J* c# a& p; w+ s2 m" N        (heat, new Selector (heat.getClass (), "updateLattice", false));
4 o; o1 G2 e" B0 v1 y1 R; v/ h    } catch (Exception e) {6 l# j, s% W* ^" @( i0 `* ?* G# j
      System.err.println("Exception updateLattice: " + e.getMessage ());
" ^" ?* ~. f/ E; U    }" P4 }' ^* C! U+ L4 i
        ; @1 U% Z: Z& ?/ I7 e- x7 j
    // Then we create a schedule that executes the
# ?: z7 e: F2 H( i5 S) `9 Z    // modelActions. modelActions is an ActionGroup, by itself it: O9 U# q2 a& h
    // has no notion of time. In order to have it executed in: z0 Z6 A3 S9 `2 w/ {8 {2 x8 e7 f
    // time, we create a Schedule that says to use the6 y0 Z) O: V$ X1 Q$ y+ j
    // modelActions ActionGroup at particular times.  This
9 Y: i! J9 t* {3 I    // schedule has a repeat interval of 1, it will loop every, l4 f; u5 q) ~, d5 G
    // time step.  The action is executed at time 0 relative to/ U8 u3 V  D$ u( d5 G/ N; N& r
    // the beginning of the loop.; `' v* v$ d' p% a# u% E6 J

( B; a2 z3 l$ i9 h3 l' M5 P    // This is a simple schedule, with only one action that is
' O& \, X$ B$ y6 Y9 _+ }    // just repeated every time. See jmousetrap for more" ~% v, ]8 Q* t" a5 N
    // complicated schedules.
. B% f+ Z6 Q" d1 J, Y# v! x  4 w: v- S# W& x* E/ o+ E
    modelSchedule = new ScheduleImpl (getZone (), 1);
, d# P% Y/ P" f5 i, v    modelSchedule.at$createAction (0, modelActions);
1 ]+ i5 `) Q5 H, }$ U! F        " N% D- g* k/ M8 W" R
    return this;. N5 l9 i* V  s# Q' U  J7 R
  }
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