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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:, T3 u5 t( l4 R: P
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public Object buildActions () {7 ?9 c, g9 |% @8 `7 ^# ?* c2 s/ ]
    super.buildActions();, G7 Y, v: b/ H, k% y4 e
    4 @1 X* u, G% P/ t. C' o
    // Create the list of simulation actions. We put these in: |1 ?$ l) a- K" a5 q
    // an action group, because we want these actions to be
8 w3 e; x( l+ \7 V    // executed in a specific order, but these steps should
8 Y6 I9 W; D) L# |: ^% H    // take no (simulated) time. The M(foo) means "The message# I% }5 Z2 f3 E; Z. f3 U
    // called <foo>". You can send a message To a particular* u+ [7 L7 ~3 M
    // object, or ForEach object in a collection.
& o3 \' ^" q2 P* x        
7 ^5 ]0 ]7 N' p, t$ _8 U4 Q# g' r( N    // Note we update the heatspace in two phases: first run
0 j1 F3 C& s; Q4 E% e+ P0 ^    // diffusion, then run "updateWorld" to actually enact the& K0 d( Z6 U& b- r0 W/ `2 N. V$ S
    // changes the heatbugs have made. The ordering here is: d8 K" @8 k( M8 z
    // significant!) z1 |4 m8 g& m; ~5 ~& W  ]" ^
        
& t8 ?" {# |' {- P7 l    // Note also, that with the additional
) o7 {* n. j! p) C, J) x) O    // `randomizeHeatbugUpdateOrder' Boolean flag we can
1 @! j6 }$ k: q* n8 S( T    // randomize the order in which the bugs actually run
+ S* b; @7 t4 r9 E    // their step rule.  This has the effect of removing any0 b7 l# C# b9 j! d
    // systematic bias in the iteration throught the heatbug' k( x3 Q4 v! `
    // list from timestep to timestep
; v1 L5 x+ |6 b7 B7 T. c        & [( ]; H  h- Q6 u, y
    // By default, all `createActionForEach' modelActions have
5 E8 ^0 A0 t, T& w& V- J    // a default order of `Sequential', which means that the
0 z3 K. C7 y" @    // order of iteration through the `heatbugList' will be7 m9 r3 f  t0 s& I) n, t
    // identical (assuming the list order is not changed
1 x4 H2 s! g: \3 |    // indirectly by some other process).
2 y' d6 m* Q: L: q8 l    ' P2 y9 U$ \2 Z& [
    modelActions = new ActionGroupImpl (getZone ());
/ h5 S4 z+ e7 E. D. Y/ E9 }* b  S- V- @9 M2 s' L0 W5 |: Q9 y, B
    try {* @3 @% j, h# l% t+ Z# A3 `) ^
      modelActions.createActionTo$message5 Q( e0 n7 d' z6 _1 H6 n) x
        (heat, new Selector (heat.getClass (), "stepRule", false));: I! h1 z3 I- @/ W" I1 P
    } catch (Exception e) {
9 l! d; L: D$ g+ q: b9 o  l% C      System.err.println ("Exception stepRule: " + e.getMessage ());+ [1 b. y' J5 w, x
    }2 Q. b7 Q+ o8 P3 ?" k
* {; _; R8 y  `
    try {, c1 g: F3 {3 `1 A2 G+ I! b+ V) l
      Heatbug proto = (Heatbug) heatbugList.get (0);" q% ]9 A8 j# E' O6 `. v/ s- Y
      Selector sel = ( s. Q0 \: y: L
        new Selector (proto.getClass (), "heatbugStep", false);
/ I0 _  {+ A: x" ^$ l5 V      actionForEach =% v4 Q3 g2 c2 O( ]
        modelActions.createFActionForEachHomogeneous$call
7 j7 y0 m8 B! r2 }- v4 b        (heatbugList,, ^# \+ _2 ^3 H) C% M
         new FCallImpl (this, proto, sel,& @+ J( C+ t7 B, o( a' Y4 L
                        new FArgumentsImpl (this, sel)));& R4 F2 k- W6 k+ @% ~- |( c
    } catch (Exception e) {
+ F  y* V7 m% a; l/ y      e.printStackTrace (System.err);; v, V; O4 k% s+ r
    }: A$ z' Z9 n) `
    ! Z& Z  e1 Q  R/ r
    syncUpdateOrder ();
, O: `: }3 R9 [7 k
9 }1 T/ f  k' j6 T    try {8 N& x2 l. g8 k2 P
      modelActions.createActionTo$message
0 W; i5 p9 K& b$ }4 [        (heat, new Selector (heat.getClass (), "updateLattice", false));
" }  |3 @. i+ _# P% F. `' r    } catch (Exception e) {
; i  }: _, X$ Z8 G  C) J8 O      System.err.println("Exception updateLattice: " + e.getMessage ());
1 R* C+ k9 C% m    }
' Y& m- `* [$ y* `        
' ]+ t% T2 A( G    // Then we create a schedule that executes the
" L) G% C1 K8 l( x' L7 d    // modelActions. modelActions is an ActionGroup, by itself it
" k) `; C! F! w) _( l    // has no notion of time. In order to have it executed in
" M# G) a. d. l" L    // time, we create a Schedule that says to use the/ f& {7 @6 q2 D- x0 U# j: _
    // modelActions ActionGroup at particular times.  This
) ~0 u0 h6 k  ~    // schedule has a repeat interval of 1, it will loop every0 [0 d6 F' T) C* m2 }6 l4 a
    // time step.  The action is executed at time 0 relative to
' }$ d5 M+ l& Z$ A, R" I2 o    // the beginning of the loop.
3 y" p/ Y1 H: u2 b% J% R3 [  ~/ |4 f* c$ J
    // This is a simple schedule, with only one action that is
  r) Y3 @* w. K& @7 v$ B) L    // just repeated every time. See jmousetrap for more! h: g! q# u& B+ _
    // complicated schedules.
% I$ D+ g( `6 E( k- L  
, ^( f5 `. K8 H7 d6 D    modelSchedule = new ScheduleImpl (getZone (), 1);" }, c1 A0 d3 N9 }' C' H
    modelSchedule.at$createAction (0, modelActions);
9 j( @+ P, P) y$ Y# {$ i        ' n' ?, W& Y' V# T
    return this;
1 S' S3 L  Z" N. P3 ]  }
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