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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:* W) H4 p$ {: I: `
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public Object buildActions () {
9 }4 U2 R* s7 f$ k: l, _2 \    super.buildActions();
+ z- E( a, {. D2 U$ K) ?    . f" l+ J8 i8 r0 [+ p
    // Create the list of simulation actions. We put these in
$ r0 ]# o0 O  m: b( G    // an action group, because we want these actions to be7 U* s8 V& {+ f, I8 v6 M
    // executed in a specific order, but these steps should
3 c+ I4 t  {! D( j5 h+ ]( r, C    // take no (simulated) time. The M(foo) means "The message4 {  k6 }$ Q* B7 R) S( J  P( @( `
    // called <foo>". You can send a message To a particular
) a# _1 C; W' H3 }2 P    // object, or ForEach object in a collection.
+ y2 e& a$ X, d- k9 J        
1 q# z6 ~% F, @& N4 c- L! _    // Note we update the heatspace in two phases: first run
1 p. W- {( ?" m9 Y# f    // diffusion, then run "updateWorld" to actually enact the- l9 x; n' M8 b" L4 `0 ?
    // changes the heatbugs have made. The ordering here is: |4 X! I8 z" ~0 Y- L$ o
    // significant!! @0 \! ?" ?3 I6 ~8 E
        
' ?8 u$ \; d/ |! ]# C; _8 C    // Note also, that with the additional" x0 [9 [& g' B4 J- t* u
    // `randomizeHeatbugUpdateOrder' Boolean flag we can" b9 j/ l5 V2 e  c$ m8 u
    // randomize the order in which the bugs actually run$ ^+ [; ]; J. D6 J* B' r
    // their step rule.  This has the effect of removing any- p, u+ }8 d5 i( y3 f6 ]
    // systematic bias in the iteration throught the heatbug
5 T7 [6 T0 M! |0 I* [    // list from timestep to timestep
$ Z; d) n# `# ^$ D' G- u5 g        
3 ?' N" M* Z- F' Z! J; ^    // By default, all `createActionForEach' modelActions have
; f6 g* c& W' n  u2 W+ o2 j    // a default order of `Sequential', which means that the1 F; m& {3 ~8 A( \# P
    // order of iteration through the `heatbugList' will be
/ I. {5 k1 G: B    // identical (assuming the list order is not changed- e5 U5 ]3 {& e# L' ]2 k
    // indirectly by some other process).
3 ?8 I5 Z  w/ e' o. r   
# t' A  x5 Z/ M( x    modelActions = new ActionGroupImpl (getZone ());
; u- k% y4 c7 x  T  {0 ~' B4 Z& M( ]+ N- x9 N4 |
    try {/ I2 N- h' T  L
      modelActions.createActionTo$message
& w7 [2 E* o% y        (heat, new Selector (heat.getClass (), "stepRule", false));8 J) Y# g  F8 \' l( `
    } catch (Exception e) {  }0 U0 a1 K; q9 v- }- |7 k, w/ W
      System.err.println ("Exception stepRule: " + e.getMessage ());& p+ [6 x- n& a. `
    }
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    try {
- w  @2 Q" C6 Z9 k  J9 R3 K      Heatbug proto = (Heatbug) heatbugList.get (0);
. k. i5 A0 U3 {" D; Q4 i  T- Q+ S      Selector sel =   D  q: N  N3 s6 e! P! x6 t6 u
        new Selector (proto.getClass (), "heatbugStep", false);
7 S2 T: _8 f' }$ \% x) ?; M( C      actionForEach =
! O. ?$ j( ^; t        modelActions.createFActionForEachHomogeneous$call
& ]  ?0 c% N! _8 e) W# l  Q( |        (heatbugList,
  Z  o) t8 B2 Q* Y- m6 [         new FCallImpl (this, proto, sel,
+ f7 b8 s+ {$ {- m3 u- O2 t# ^                        new FArgumentsImpl (this, sel)));$ V. r! |' O/ W/ u$ E! o& E; x! N
    } catch (Exception e) {
% j) q- v1 X: F! K! V# U; {      e.printStackTrace (System.err);; H4 Q6 {* `# H  P& j+ J+ }# N
    }  n; X7 T" q* p- K1 h
    : y0 K/ v0 |  B/ m
    syncUpdateOrder ();; O+ N2 ^. s9 ~( {
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    try {
5 ~, C* H0 `. }8 }      modelActions.createActionTo$message
& f, q0 P% j* z8 {        (heat, new Selector (heat.getClass (), "updateLattice", false));
$ X2 x9 v1 _$ ~& x6 I3 ]    } catch (Exception e) {
) D! r, W& ~* Y; }$ B0 ~, \) V$ O      System.err.println("Exception updateLattice: " + e.getMessage ());# K' _2 Q' Q7 _' u/ [% N
    }
9 i; ~- i6 a0 L# ]; u8 Y          m) `, R& e* u) W( O5 H8 ~& R# H
    // Then we create a schedule that executes the. {5 d! t9 R7 r0 ?6 m1 b+ t
    // modelActions. modelActions is an ActionGroup, by itself it! o4 {' S/ M7 f) m. @
    // has no notion of time. In order to have it executed in; w' Z4 m- W8 q9 }1 U$ F
    // time, we create a Schedule that says to use the' G0 @  [  ?* D2 n7 q
    // modelActions ActionGroup at particular times.  This( O5 ^( H# W4 W+ o, @. [7 o
    // schedule has a repeat interval of 1, it will loop every+ k: W$ D; Q9 w- z
    // time step.  The action is executed at time 0 relative to/ v/ r2 x+ h6 `
    // the beginning of the loop.9 H4 a: b  @& q- Q
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    // This is a simple schedule, with only one action that is
6 j3 V1 B+ J( h- P* P8 k    // just repeated every time. See jmousetrap for more
( |1 n) R( }6 n( B- ~4 A! h    // complicated schedules.
% I6 x. r) \/ j4 m& S  
! Y9 D8 [1 w! B: `: z  ]2 O8 a    modelSchedule = new ScheduleImpl (getZone (), 1);/ B! _0 j- _/ R' X
    modelSchedule.at$createAction (0, modelActions);
( N, u8 F2 h5 h- y, `        
  r2 A% N8 U' E- D% y    return this;
9 D7 b1 Q% {7 j  e: r, j  }
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