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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:
% X7 F) a' ?9 z/ m! c* W! D% @1 d( H: @- y
public Object buildActions () {* t& {5 P) B4 a6 i) m1 P& \! H
    super.buildActions();/ g  I/ r, l/ u5 k% y+ W, i: a1 a
   
& {$ `% f( x9 x% E5 e! ~5 x    // Create the list of simulation actions. We put these in
# N8 @  q- P7 @$ f    // an action group, because we want these actions to be9 B7 m! N# w8 k" c$ J
    // executed in a specific order, but these steps should! K8 X+ z& J8 B3 i+ p5 p
    // take no (simulated) time. The M(foo) means "The message/ I5 z1 W7 h, k) J  T7 ~
    // called <foo>". You can send a message To a particular2 n" ]; E# n3 D' P# j- n6 K, f# X
    // object, or ForEach object in a collection.. W$ r; y5 i. a, x
        
  J' _3 L' G6 z    // Note we update the heatspace in two phases: first run0 D9 I: X! z* r( N7 k2 g& e' g
    // diffusion, then run "updateWorld" to actually enact the. U! a+ @+ w3 ]& U
    // changes the heatbugs have made. The ordering here is
) P7 q; I# G6 y2 B  b    // significant!. G" p/ B. F% H# ?; [( |% ~
        0 N( a3 U7 s& D9 j0 i+ k: S
    // Note also, that with the additional# P9 b- {2 C' r* z* n5 g: d, l
    // `randomizeHeatbugUpdateOrder' Boolean flag we can- h9 C3 c& i' Y5 ]0 \6 v
    // randomize the order in which the bugs actually run
  ]6 q& `4 r. @% e) X9 L/ }8 L5 W    // their step rule.  This has the effect of removing any
: Q# Q# S8 m: d- `4 V2 m    // systematic bias in the iteration throught the heatbug# ?& X, [: W* `$ B$ q. H7 e  E9 b
    // list from timestep to timestep
* W: \: e- C3 Y* R/ Q        
' O" E5 T+ o2 N* J. M    // By default, all `createActionForEach' modelActions have: b# G- ^/ B4 }7 |
    // a default order of `Sequential', which means that the
9 H# L8 {8 ~" E; K/ B    // order of iteration through the `heatbugList' will be/ q+ G$ @1 T* p5 b8 t9 @
    // identical (assuming the list order is not changed$ j0 D6 G$ `. b0 R& P
    // indirectly by some other process).
  e5 `! E+ z3 i9 h   
7 I( S& I3 Y+ }2 A6 Q- u5 a' Y* A& M    modelActions = new ActionGroupImpl (getZone ());6 k6 d/ [/ Y/ V8 R3 w' q

, _; w: r, ?# r: I5 q    try {' Z; l" ~6 e; T3 X8 _- o
      modelActions.createActionTo$message* ^, @5 s+ w$ {
        (heat, new Selector (heat.getClass (), "stepRule", false));+ b- q" ]3 l6 v
    } catch (Exception e) {, l& ^; x( f% [& }$ b: ?3 W
      System.err.println ("Exception stepRule: " + e.getMessage ());' x& \" W/ l1 ^# q0 l+ g" U$ `
    }
4 x9 [; q1 k6 P& m: @
0 L' p; Y3 i( b# ~3 |    try {( C* p: c1 G" C/ G6 o
      Heatbug proto = (Heatbug) heatbugList.get (0);/ {4 _+ D) e7 h- Y( r% s, ?/ \
      Selector sel =
; j; C' O0 m, w. }" X; O        new Selector (proto.getClass (), "heatbugStep", false);6 E5 n. G) j* w; `8 @
      actionForEach =2 u' {- v. H* P% B7 W
        modelActions.createFActionForEachHomogeneous$call
1 P. p4 M) g7 O5 \  ]4 ^4 H        (heatbugList,
7 \2 Z, Q3 {, ^) ?         new FCallImpl (this, proto, sel,$ i4 B( W2 f4 r. g+ a5 @$ u
                        new FArgumentsImpl (this, sel)));
; a" f5 ]3 Q3 G; }# c- }) T# I& H5 W7 f2 S    } catch (Exception e) {
! m4 _5 Y  w* ~6 ~0 N      e.printStackTrace (System.err);
, v7 L; X" l9 W" O! d* b- [( i, C    }& A7 G" w, S" \% x- U4 Y9 _- }
   
9 \9 S% H4 Y2 s+ j- k1 B    syncUpdateOrder ();5 M8 C# s& H5 k6 x1 a  ]

: \8 ~* B' C7 @0 V* Y, B( D+ d9 H    try {
: g7 e+ q* h2 b# M      modelActions.createActionTo$message
- G# \2 o! u2 K. K5 M3 ]        (heat, new Selector (heat.getClass (), "updateLattice", false));, l( _' O! R. Y8 _7 F1 F+ ?- d, d
    } catch (Exception e) {
+ U( L4 d7 K, `8 R3 \      System.err.println("Exception updateLattice: " + e.getMessage ());: @1 p, d- c, }  V- L3 Q  m# K
    }8 U# i3 Q/ W0 w" I% u' S  Y0 _6 U
        : C% b) W8 Q  ~* K: L
    // Then we create a schedule that executes the9 ]7 g0 z) m: x- D
    // modelActions. modelActions is an ActionGroup, by itself it/ Q. E- z% h5 Z: n! n
    // has no notion of time. In order to have it executed in) k$ b+ L. z& ?0 ^& D: H; T
    // time, we create a Schedule that says to use the
8 {! z3 x; o0 v- G% C, f    // modelActions ActionGroup at particular times.  This
1 S9 ]" T$ h. g1 a0 ^) B7 X$ Z; `- m9 q    // schedule has a repeat interval of 1, it will loop every4 ?" c. L6 p- ^; J( b
    // time step.  The action is executed at time 0 relative to
9 E, `' ^: ~5 {    // the beginning of the loop.
  K# t0 J: l* H4 ^3 A* y( I- A7 k, A8 s1 J6 a
    // This is a simple schedule, with only one action that is, B( [) k+ @  h" Z' E3 ~& @" k, f
    // just repeated every time. See jmousetrap for more8 n0 ]4 E$ X  @, Y2 M
    // complicated schedules.
/ O" K5 e" C9 l2 L6 u( n  $ l7 T5 \% V7 e/ {% J
    modelSchedule = new ScheduleImpl (getZone (), 1);
3 D$ @) g1 [! ]3 h$ f2 ]6 F    modelSchedule.at$createAction (0, modelActions);, X* f1 U) C/ D+ ^( s  L4 ]. Z
        
1 G. {$ K  l! b4 W9 B    return this;' u! T3 p6 C; r6 N7 m& I- [
  }
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