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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 p( p% i8 Q$ W; U/ R" T1 ]
# ^% A: I2 G$ T$ C3 a
public Object buildActions () {
3 j: u9 R) ~1 [    super.buildActions();* w' r7 X; M! o! i# r( q
    - o) O% w& @1 e
    // Create the list of simulation actions. We put these in
1 x1 M, S+ u# a% b    // an action group, because we want these actions to be2 C# x* H' Q( e8 y: n
    // executed in a specific order, but these steps should. S3 q" F3 B- j6 {4 j4 |
    // take no (simulated) time. The M(foo) means "The message
, D$ m& v9 z. ~9 q5 M/ Z5 }    // called <foo>". You can send a message To a particular% I& K5 N1 u, h
    // object, or ForEach object in a collection.
- \; v, z; k! B" ^9 T) H        
: R9 Q8 v% E# b3 D7 w7 a, q    // Note we update the heatspace in two phases: first run" f# W4 R, \! w2 D- J
    // diffusion, then run "updateWorld" to actually enact the
1 o* b4 N! C. X# o4 V) B" I    // changes the heatbugs have made. The ordering here is$ X* {2 _1 }3 r, d
    // significant!
" m1 O  f7 Z- l4 q* v& e8 K+ H, \        ; D* n% O: z1 ^/ H# X7 z
    // Note also, that with the additional
5 v4 V" {$ K1 D/ S6 s    // `randomizeHeatbugUpdateOrder' Boolean flag we can- \5 s9 ?. A- B! S8 ?
    // randomize the order in which the bugs actually run4 H7 d. b. ^% p
    // their step rule.  This has the effect of removing any# ^7 |& K! C# G
    // systematic bias in the iteration throught the heatbug! t' b0 J6 @; `) }( G7 t6 p" a" a. f
    // list from timestep to timestep: A) A6 I% I: [$ ?. E! _
        4 k% G* O" f9 ?: U
    // By default, all `createActionForEach' modelActions have
# `7 f: j) s' j# v! M: y; p    // a default order of `Sequential', which means that the
9 b1 c- Z. G3 M( r, b, c0 d    // order of iteration through the `heatbugList' will be& F2 {7 g- O2 P; w; C) C- |6 T
    // identical (assuming the list order is not changed
* ]- ^6 R( U( ]  M    // indirectly by some other process).' P) B3 N( E! h4 W1 S
   
) e2 x2 t1 J1 u; W    modelActions = new ActionGroupImpl (getZone ());
  A& l5 T# m" ^- W% z; [. _1 l4 M/ M4 h# O* a
    try {
8 y* b- C6 I& z( B4 ~: G* E      modelActions.createActionTo$message* u3 R* ?3 {, [
        (heat, new Selector (heat.getClass (), "stepRule", false));
* G; E1 n7 a( y* e    } catch (Exception e) {4 I: l1 Q2 k/ S9 `1 c6 @: v. b0 g
      System.err.println ("Exception stepRule: " + e.getMessage ());
, S8 d3 ^  j3 \! s: w9 x/ K* w- D( u    }
' ~- A' y" e4 ?" ]; a
6 f5 a- F- I8 y# z3 t2 z; B    try {
# q+ @* }% D3 u+ r; `' A# ]* b* V      Heatbug proto = (Heatbug) heatbugList.get (0);3 W& L5 h9 k! j" Y+ I( v- R
      Selector sel = 1 S" g! h0 d# o9 o# F
        new Selector (proto.getClass (), "heatbugStep", false);
9 T+ `. Q: h+ ~' x* T      actionForEach =
3 p, [8 x( l2 e; t2 j        modelActions.createFActionForEachHomogeneous$call+ o# R! y5 M9 Z3 _+ _1 C) V" D' |0 V
        (heatbugList,
4 c# X: j/ B- \: \9 |; G% p         new FCallImpl (this, proto, sel,5 b% |8 ?, O" D: ^3 K3 h
                        new FArgumentsImpl (this, sel)));
" T% a! t2 T! m; l    } catch (Exception e) {- B9 H/ r) ?% Z
      e.printStackTrace (System.err);
3 n; `( C, E$ b    }
  H9 E# R- R- ^    9 U3 a! I  s) U% L
    syncUpdateOrder ();8 p; t  e3 j. a! j2 ?- s

$ ^+ |* k6 C/ e: B    try {8 }; G+ y( X3 Q0 |: o
      modelActions.createActionTo$message * m5 [" d; }) s( G
        (heat, new Selector (heat.getClass (), "updateLattice", false));6 \$ P% O; k: g# K
    } catch (Exception e) {- M& n, T. E; l# }. G/ D6 r% P, @
      System.err.println("Exception updateLattice: " + e.getMessage ());4 W: Q& {" J1 u5 G" Y' {6 ^
    }
3 T1 s- b2 ~: H! y1 b        ) b# T. U0 s6 B) o" d  R8 A
    // Then we create a schedule that executes the6 x" ?( V% F  M* _( T- ^  A
    // modelActions. modelActions is an ActionGroup, by itself it9 b* V1 u& i- R
    // has no notion of time. In order to have it executed in" a3 u7 y) ^6 [' O3 F5 q
    // time, we create a Schedule that says to use the7 O  c+ P9 M: ], _
    // modelActions ActionGroup at particular times.  This  s/ r/ Y" I, h9 Z  [
    // schedule has a repeat interval of 1, it will loop every8 K6 S4 o, `6 u7 ]5 [$ o5 u5 l! }
    // time step.  The action is executed at time 0 relative to- G; o8 Z1 t& M0 {: v7 ?$ h' O
    // the beginning of the loop.+ r4 X3 F- ?! l$ ]6 k0 ^5 A

- h( n  B0 v7 S    // This is a simple schedule, with only one action that is* v: b6 O+ j3 E6 V$ G
    // just repeated every time. See jmousetrap for more4 d) f; ~% S1 e) ^! u! S
    // complicated schedules.% z" x0 C/ T, ?8 R3 Q/ Q# w" A
  + b% ^6 q. _) U0 `5 v; Y' T. j; J0 z
    modelSchedule = new ScheduleImpl (getZone (), 1);
8 e: B$ A6 E6 X% R    modelSchedule.at$createAction (0, modelActions);8 `/ q! s% R3 F* ~" t
        7 ]' D+ `  m/ W" }9 L2 k& {
    return this;  L$ _3 i; ]& R, Y  j  g
  }
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