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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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( o. l+ u  Q5 K public Object buildActions () {
/ G4 S- r9 P$ U! s, a    super.buildActions();+ Z; {+ ^* ~$ s1 D' V6 f4 I# a
    2 [! V: Q' b9 F. f, N  m. V8 `) r
    // Create the list of simulation actions. We put these in
8 @* b% O* |& D  u' @0 G5 ]    // an action group, because we want these actions to be
# B; e( _& R- D6 w5 A    // executed in a specific order, but these steps should
7 S4 X# k" t' N- }    // take no (simulated) time. The M(foo) means "The message' M% L# R7 }! A+ _6 E% ?9 L5 d
    // called <foo>". You can send a message To a particular# _$ ^/ Z: E8 Q+ f
    // object, or ForEach object in a collection.
8 ?! h  _! b& x- s8 M6 T9 i( X/ |        
$ M$ d5 ^" Q) C9 R9 N' C5 Z    // Note we update the heatspace in two phases: first run
) h5 }  q( Z/ x8 J    // diffusion, then run "updateWorld" to actually enact the. [8 N/ b# f! x& @, ~! h
    // changes the heatbugs have made. The ordering here is! o+ U2 ~( g% d9 Q) L! J* z5 N
    // significant!
& h9 y; s5 L$ H/ E, p8 j        1 f, \( M- d" k
    // Note also, that with the additional
* ]  z0 H% a# p* b" z, n    // `randomizeHeatbugUpdateOrder' Boolean flag we can
* i( Y9 M+ G' r$ \3 |& G- B4 A7 O    // randomize the order in which the bugs actually run* C! b* t) r9 ?! ]* ^; C: M
    // their step rule.  This has the effect of removing any0 m% O7 [7 z4 N% j2 q8 q% H# b
    // systematic bias in the iteration throught the heatbug
: }$ R# i9 k0 B$ \/ c: }, I; p" Y' |    // list from timestep to timestep8 `- \  P" c+ ]; N) \' u7 q7 h
        5 ~* `4 @  ]. @6 K
    // By default, all `createActionForEach' modelActions have7 ?8 w& w: h0 J, V
    // a default order of `Sequential', which means that the6 H8 n0 m$ v3 j3 e& \
    // order of iteration through the `heatbugList' will be" T8 Y# E2 F6 d, {8 o# d! C
    // identical (assuming the list order is not changed" O5 M3 P" X  b+ M8 J- }
    // indirectly by some other process).
/ J: Y3 f( X# ^   
1 P3 c1 {/ Q$ F/ z, z- ~: c5 z0 x5 D    modelActions = new ActionGroupImpl (getZone ());
+ G& C5 U8 `" P% b* Y" c
. Y' J  n" @2 x; _+ ~% \) d% t    try {
: D' J! l5 M$ K( Q. A  \4 \      modelActions.createActionTo$message( M( r7 d3 z7 w2 {& x4 _5 Z
        (heat, new Selector (heat.getClass (), "stepRule", false));
+ v5 }' Y7 w/ A3 B    } catch (Exception e) {
& T, L; Q6 g+ u3 \2 S      System.err.println ("Exception stepRule: " + e.getMessage ());
5 o3 P6 P9 _! o& w3 Y    }* _7 O+ J% I; m" _: r7 |

" K* n; Q5 X$ \- @3 b    try {
# L2 U3 @( h+ Z% G6 Z" z# m      Heatbug proto = (Heatbug) heatbugList.get (0);4 X! Y  W; T. h* P! t* m
      Selector sel =
0 h9 ]8 F9 d) v  k' `        new Selector (proto.getClass (), "heatbugStep", false);9 S  O! E7 v0 K) u% F
      actionForEach =5 a7 i3 h: X' Q1 M3 X- S% ^
        modelActions.createFActionForEachHomogeneous$call1 B* t2 @" U# |4 }9 F
        (heatbugList,
% B$ ~$ J; p& `, @% r         new FCallImpl (this, proto, sel,
( ]4 P6 d2 X4 V                        new FArgumentsImpl (this, sel)));" j* M3 E5 Z" G  ~
    } catch (Exception e) {: N! u6 r: r5 `+ u
      e.printStackTrace (System.err);4 l9 z7 B, b6 r% K) }' r
    }! s$ h$ K' y; W# [! x. @
    ( q9 a8 ~, `7 M4 W1 x- s: Z
    syncUpdateOrder ();- u! q( c3 `- p2 K

- z3 s& H5 q0 [* m; @- |7 \+ y4 Z    try {
' q, m1 K4 m4 r$ L" j      modelActions.createActionTo$message
' l3 S! Q  ^( o# y        (heat, new Selector (heat.getClass (), "updateLattice", false));
4 f. |5 B! |1 F* k; B& p$ D; E: d) H    } catch (Exception e) {
' l+ g1 E/ v2 s6 j      System.err.println("Exception updateLattice: " + e.getMessage ());
3 H! ?0 T9 u8 P/ o4 x    }7 G3 f* t0 d; b' t
        
3 j$ R) o' ]7 @5 X3 z    // Then we create a schedule that executes the
- B5 R' y5 I# H' q) n$ M1 j0 f) M    // modelActions. modelActions is an ActionGroup, by itself it
' _2 u3 g/ [; v9 l    // has no notion of time. In order to have it executed in
+ t! C) J+ r/ \+ S6 l( w- M. M    // time, we create a Schedule that says to use the, s1 t& g: x3 B# Z
    // modelActions ActionGroup at particular times.  This! h( \$ J  W' F- W- M! ~
    // schedule has a repeat interval of 1, it will loop every
% L* o2 s9 ^5 D, Q! w: U2 r( A1 D    // time step.  The action is executed at time 0 relative to$ q% R! W: O8 d7 ~/ i1 Q0 p
    // the beginning of the loop.( N9 [9 V/ H3 C* t$ J

, Q' d/ _3 D& a    // This is a simple schedule, with only one action that is
. q) H3 c0 K* d6 }/ n: e    // just repeated every time. See jmousetrap for more- q2 n9 l% I, S7 j) u7 M$ `
    // complicated schedules.; I. m1 b  @5 \) h9 F
  
/ a3 ]# _' G2 G8 Q$ _  @3 a    modelSchedule = new ScheduleImpl (getZone (), 1);
2 u$ y7 D- B0 \! N; y) `    modelSchedule.at$createAction (0, modelActions);
% x+ }; m4 c$ K  o5 C. e0 p) f        1 D6 E5 e6 H- o$ b+ O3 C. ?+ K
    return this;
+ V' r# P) e! T: o% [  }
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