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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:5 B% o- B  s7 d7 A) _. @/ ?
  E- r' S1 d- o) o1 t
public Object buildActions () {! X1 m) R( i& Q/ |8 A
    super.buildActions();. H# h) _7 q; }" n1 [9 D
   
0 P9 k- r. C8 q& F5 c    // Create the list of simulation actions. We put these in+ p" U, H6 r7 x# O$ }' g0 g" y& C$ H; R
    // an action group, because we want these actions to be
% S# _; {5 H( K% R3 F3 K8 f9 p    // executed in a specific order, but these steps should, Z  X. O5 ^( F- w2 n, j  t: V$ P
    // take no (simulated) time. The M(foo) means "The message6 H% x3 X' e! I% C! \+ g
    // called <foo>". You can send a message To a particular
0 R. ~8 F/ w; C$ {    // object, or ForEach object in a collection.
- _, S* Z, r* z1 u9 d* l; w( j# Z        
; X( J; g) y: [. @  F! }8 @/ e. [    // Note we update the heatspace in two phases: first run7 m7 E6 n# j. o5 R1 ^0 g
    // diffusion, then run "updateWorld" to actually enact the
" J, t  `1 h9 a    // changes the heatbugs have made. The ordering here is; Z; [  n3 H* F
    // significant!; I7 x' K# `* e( ~# K3 |$ w
        ) h; d" l5 V' ~. Z
    // Note also, that with the additional
3 I. [* G, C) Z1 H2 S    // `randomizeHeatbugUpdateOrder' Boolean flag we can
7 N  c8 H8 t7 |7 x    // randomize the order in which the bugs actually run
1 ^" ^. D6 j9 \6 v& \2 M    // their step rule.  This has the effect of removing any4 W9 q5 `, t# V  }1 ^
    // systematic bias in the iteration throught the heatbug
5 J; X! l: @1 R( e7 b" ]) m    // list from timestep to timestep
8 d- _9 N# L  \8 E. b7 y        4 d6 T, l% ~! R" w; L! {: A: T) u
    // By default, all `createActionForEach' modelActions have- m# R+ h& i2 E6 F; {3 K3 W
    // a default order of `Sequential', which means that the* a& h* d6 U6 F; F/ _
    // order of iteration through the `heatbugList' will be
4 C0 X& a/ }  ]    // identical (assuming the list order is not changed
5 v# \/ w: S! o% V    // indirectly by some other process).& d+ {8 M% T6 u
   
/ y- G# o) N/ p/ k3 _3 l% {- A    modelActions = new ActionGroupImpl (getZone ());( s9 [2 k+ z, `* c5 a: G0 U, a
- e7 e( o+ h# Y$ ?" \
    try {$ l! q7 c8 c! k( |( H5 h0 f
      modelActions.createActionTo$message' x) E6 m" p" v+ i0 X: O
        (heat, new Selector (heat.getClass (), "stepRule", false));" k5 I( u4 Z5 D8 k7 D
    } catch (Exception e) {
  p: H. x* D5 `' e, `      System.err.println ("Exception stepRule: " + e.getMessage ());
. D7 @  d: ~/ v    }) Q: A& G" {! ]( M' F- Q
  i) k6 Q0 b' y
    try {7 k& T5 h+ l0 D/ r
      Heatbug proto = (Heatbug) heatbugList.get (0);. f( H: {. r3 m. T' E
      Selector sel = & W. d% E2 f+ B" W1 m9 @: |1 g8 |
        new Selector (proto.getClass (), "heatbugStep", false);
0 P" X5 [6 u! x. B5 E      actionForEach =
: p! p6 V* I' [$ |: ^) K5 T        modelActions.createFActionForEachHomogeneous$call
2 R  Q; v7 }, R1 i: I! @! ^5 U  i7 @        (heatbugList,
6 v* R- R0 z: X, [         new FCallImpl (this, proto, sel,' i% @" P- b2 Y+ B5 G
                        new FArgumentsImpl (this, sel)));
. [- b% |" J% B2 L; Z3 S! b    } catch (Exception e) {
2 l8 p  s7 q( t8 i% K      e.printStackTrace (System.err);
' o- w$ v2 v# A+ x+ N8 i    }
5 a6 L; X/ Z# S/ X! o5 J3 Z    ( b: c/ p  @3 s% z  U/ k; E
    syncUpdateOrder ();( `: |6 w3 t# d* N1 ]: y8 @
# }8 ^. m$ M7 f) [7 _
    try {3 I/ x! [8 A1 l  Q7 @& x
      modelActions.createActionTo$message ) y3 [! k! L& L; x! p) ^
        (heat, new Selector (heat.getClass (), "updateLattice", false));5 S8 d  f4 ?; X: C$ y
    } catch (Exception e) {, p2 ?3 O- q7 a7 k* a7 \
      System.err.println("Exception updateLattice: " + e.getMessage ());' b9 E  Q" ^3 {" B! q
    }/ E) I1 G8 k5 x% F, z
        
  q! O1 a7 C  Z2 q1 q    // Then we create a schedule that executes the
" e8 U; b, y* e  x* l. d* W5 t    // modelActions. modelActions is an ActionGroup, by itself it. A7 H: n  G. [; Y) v, s
    // has no notion of time. In order to have it executed in
$ G& k4 U! x  T$ o0 _    // time, we create a Schedule that says to use the1 C2 }, ?; {' r  E
    // modelActions ActionGroup at particular times.  This
5 a/ k) J5 M  ?3 p    // schedule has a repeat interval of 1, it will loop every
; N3 B1 ?' ]) H# {. v    // time step.  The action is executed at time 0 relative to
2 b$ T2 e# R2 i+ \" |( C9 }    // the beginning of the loop.* `3 T& [% j& R3 G5 z3 ?/ n3 o  Y

! C: C+ C8 T+ [    // This is a simple schedule, with only one action that is) A9 g+ N, N# A  q; `/ m3 H
    // just repeated every time. See jmousetrap for more* q" A+ ~1 B( z! Y0 h" Q
    // complicated schedules.4 S; h' U# Z! r1 `
  . O1 V: u9 A. X) V! |' t# _
    modelSchedule = new ScheduleImpl (getZone (), 1);
+ j' R, [0 N+ l6 _% j  _6 A# u3 Z    modelSchedule.at$createAction (0, modelActions);, J" w& W/ ]* l1 O8 c! B' C( d
        ' ~# t5 f2 I9 l% r4 p+ _9 T
    return this;
- r5 w* s  K, H; ^, l  g  }
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