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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 () {6 E  Q3 }; t; F9 s0 @$ U0 q
    super.buildActions();
4 n+ }" K8 j/ E7 j   
2 u( V1 V7 g" J$ B    // Create the list of simulation actions. We put these in# U7 q3 t9 J# q) G1 r1 x- X
    // an action group, because we want these actions to be
6 L; ^" n) P$ I! @! J  u# y. D, g    // executed in a specific order, but these steps should
( h, z$ @; `% y# s" h2 |, @9 _3 l    // take no (simulated) time. The M(foo) means "The message& |4 |, H+ N- M7 h; d9 R1 i" x
    // called <foo>". You can send a message To a particular# }  A8 V  u* g! q' a, q0 b
    // object, or ForEach object in a collection.
8 V, l9 p$ v0 `2 V        / {' S; y0 Y6 w
    // Note we update the heatspace in two phases: first run
! U% _  |& |* p# O0 F+ Z    // diffusion, then run "updateWorld" to actually enact the
0 F5 K2 ]- u$ B6 I1 b% n% ~$ h3 I    // changes the heatbugs have made. The ordering here is- Q! ?- M" @+ G8 H7 c; t! J
    // significant!
4 Y1 V* x. b' B0 D- B8 o( i& w' W" {5 ?          F6 _6 H1 n) q0 v9 ?
    // Note also, that with the additional# k! J* O6 U2 m5 j! O# l" x4 Z
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
8 b5 L! T; a3 ]" b: K: M% n! }; c    // randomize the order in which the bugs actually run1 e# C7 M: k: r7 C" c
    // their step rule.  This has the effect of removing any, g7 U; l* ]% {& L3 t/ B+ K8 X; H
    // systematic bias in the iteration throught the heatbug, q. ^( B# r9 g. f
    // list from timestep to timestep
$ _& x1 N5 V# ]" U( M          X! ~2 i0 R' Y9 E- l. ]- z5 S
    // By default, all `createActionForEach' modelActions have
! Q& ~1 B3 K2 Z. w    // a default order of `Sequential', which means that the
1 @" K1 i7 [; K- t6 D! {; i. p    // order of iteration through the `heatbugList' will be
% v' u5 ~) i4 ]. |& h8 u    // identical (assuming the list order is not changed( {6 h1 u/ l1 S" t5 t& s; R
    // indirectly by some other process).
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    modelActions = new ActionGroupImpl (getZone ());
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7 m7 {! h) p) w1 z- h    try {" @3 D+ K8 a/ b# W5 m, T, ~& W
      modelActions.createActionTo$message
, t- J" q, W' p        (heat, new Selector (heat.getClass (), "stepRule", false));
- x" q0 Q6 F: A- q) Q6 _9 f/ h    } catch (Exception e) {
. @! h8 x( {, Y1 l+ v; f9 A      System.err.println ("Exception stepRule: " + e.getMessage ());
+ H6 Z, ?/ m, D; M    }/ o- [& V7 |7 D: I

- o. u9 ~+ F1 @# P1 S- O    try {
% u! Y  H. n5 m, _* @( D& h      Heatbug proto = (Heatbug) heatbugList.get (0);5 k2 b  @) l# ?5 K: N8 n7 |! V
      Selector sel =
6 c  e9 S5 B0 b$ n5 [: w! O        new Selector (proto.getClass (), "heatbugStep", false);8 ?, P2 t$ S2 e" `5 s4 d6 x
      actionForEach =# \$ v7 l; p  |9 L! k2 L
        modelActions.createFActionForEachHomogeneous$call
9 q5 ^" e5 T/ ?; ^/ r, L! U        (heatbugList,* |3 _! m1 j$ f# M- D2 h5 v
         new FCallImpl (this, proto, sel,
( x! Q8 Z/ ?* G1 i$ x6 W& Z9 i                        new FArgumentsImpl (this, sel)));8 G8 P- t( S7 T; T' \7 r
    } catch (Exception e) {/ k3 P" x! [) }$ k- ]2 N
      e.printStackTrace (System.err);
8 B7 e. A" i2 {* b( d1 H    }/ A3 G' ~' A; ]) x! {
   
( i$ m' C* M( v6 A, A- B4 g+ P% b: A2 y    syncUpdateOrder ();) o, L# E9 p: O

. z3 n9 M* \4 F, {1 E' e% f    try {
! I! f8 w% X% [! B      modelActions.createActionTo$message   v3 l1 t$ j5 _* R
        (heat, new Selector (heat.getClass (), "updateLattice", false));7 @1 Z# L4 j2 l" \5 ]
    } catch (Exception e) {' ]; K2 B  [% u- ?# o3 t# ^
      System.err.println("Exception updateLattice: " + e.getMessage ());
- L- k0 \2 j3 h3 w$ }$ n    }
0 A" N, N0 x. k& e6 a8 g        & W4 m1 e1 a, w! T: a7 v, }
    // Then we create a schedule that executes the
$ L$ B6 m6 ]/ E  P1 R3 \" p    // modelActions. modelActions is an ActionGroup, by itself it
  L. j% V  D* p8 d$ k  H    // has no notion of time. In order to have it executed in: {( w( L2 C- n% h
    // time, we create a Schedule that says to use the; N  P# K8 g1 `1 H! f
    // modelActions ActionGroup at particular times.  This
9 ~0 x9 E' x# v  F1 W/ c    // schedule has a repeat interval of 1, it will loop every+ b" ]  @8 ]' G$ o# B" A9 v
    // time step.  The action is executed at time 0 relative to
9 m, G. d  [! \/ B0 s    // the beginning of the loop.# l( o5 h+ n* S' Q) A
- r0 \( D2 t) Q1 w) l9 ~
    // This is a simple schedule, with only one action that is6 k) x# T- `  C( W6 [. a
    // just repeated every time. See jmousetrap for more% R. I' v( U2 D( Q7 G7 J
    // complicated schedules.
3 x, _0 [1 ^2 Y: }8 k" b8 b% A  
2 u5 |; r4 N- A: N2 x6 ^    modelSchedule = new ScheduleImpl (getZone (), 1);. c7 v( i( L3 Z% s$ y& G
    modelSchedule.at$createAction (0, modelActions);
0 P$ D5 F( A# R, }# O9 r/ }" Z/ d        
+ ?& \; k, X) T$ Z: a' g5 O7 E    return this;6 o; x& ^; ~2 D
  }
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