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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:* _: h1 U/ m9 w% G( N6 s3 w
1 R6 H5 w( g- _% T9 {
public Object buildActions () {
8 t! k$ B% t, L4 V& ^, t    super.buildActions();
& v, _2 K- `* Q$ M8 \3 |3 x   
+ @; d$ l; p) }    // Create the list of simulation actions. We put these in
( U$ X: c$ k6 H7 \/ C0 K! N% y; _; T    // an action group, because we want these actions to be
3 {0 c& W$ Q9 K1 l    // executed in a specific order, but these steps should3 G# w- h) N3 |* n/ A8 X# M
    // take no (simulated) time. The M(foo) means "The message0 Y/ E9 R. q5 }& v& C; S+ `/ P
    // called <foo>". You can send a message To a particular
! E. d/ C8 F% b7 X  ~9 @: c! l# @/ B+ y    // object, or ForEach object in a collection.
7 F; d; g! \8 [& T( n0 F        ' ^: s0 g! S: W/ w" |1 N% d" O
    // Note we update the heatspace in two phases: first run1 |+ F, K/ p' i& i
    // diffusion, then run "updateWorld" to actually enact the
& V% o  Q3 D  @    // changes the heatbugs have made. The ordering here is  E; `$ B! Q* T7 ]' T' e5 ?& E0 O
    // significant!
$ ]0 f* P9 m( z  D        " |$ C) v9 z$ A2 B; V
    // Note also, that with the additional
* |: z7 n8 j: l( C; ^1 Z. g, m    // `randomizeHeatbugUpdateOrder' Boolean flag we can: v# L% o+ N* J( k5 A; x2 }
    // randomize the order in which the bugs actually run8 @/ f% S3 G. _- T
    // their step rule.  This has the effect of removing any
& n3 Z: E7 M+ Q  i/ h- n! y; A    // systematic bias in the iteration throught the heatbug4 U6 B2 N' ~0 Y  Q
    // list from timestep to timestep; B) M; S& `' L1 q$ n+ ^, D
        3 V$ ^8 m+ r! V2 U: y2 E3 w+ _
    // By default, all `createActionForEach' modelActions have/ h/ j4 @+ k- f2 |) Q
    // a default order of `Sequential', which means that the
+ [' M" z5 e. P& I6 d    // order of iteration through the `heatbugList' will be
+ b' q  m+ I* J  h9 i7 ^3 J" E    // identical (assuming the list order is not changed9 Y+ A9 p# p# L9 A: p
    // indirectly by some other process)." [( V) o& m. G+ M
    9 _7 J5 P2 L* C/ N* }7 r' r
    modelActions = new ActionGroupImpl (getZone ());
4 W  S, K. k. {3 S' C# K  t: |/ y
2 q  H3 M( b1 U( R( V% L- @    try {
0 i' Y7 X* Q  ~: [$ T' b4 s" _5 D      modelActions.createActionTo$message
0 v) g" c0 o8 {/ W, Y! Z5 h        (heat, new Selector (heat.getClass (), "stepRule", false));* i+ h4 P4 r# O! u' t* d
    } catch (Exception e) {
$ c; a, c' s2 Z+ @. v2 \      System.err.println ("Exception stepRule: " + e.getMessage ());* o) c4 L/ a  Z+ J; u3 @8 P
    }
$ @- t, N* L, u5 m$ H8 d+ r* P8 T. h3 K( n2 X) [+ b! k
    try {
, K  ^" N# U& K- ]$ s      Heatbug proto = (Heatbug) heatbugList.get (0);
$ K) h" N+ x8 |/ m      Selector sel =
* u9 j4 s) k0 b9 @' W% `6 ~+ l7 Z        new Selector (proto.getClass (), "heatbugStep", false);% w/ I& f4 B  A# j1 ?
      actionForEach =/ D" {# ^& T4 \
        modelActions.createFActionForEachHomogeneous$call% ]8 L. H8 b3 l/ V! C' F
        (heatbugList,
# B: h) c+ z- G         new FCallImpl (this, proto, sel,
+ e2 b9 G  n( H& E3 c% \                        new FArgumentsImpl (this, sel)));
( J" w! z- {/ ~    } catch (Exception e) {7 \4 J; w2 F9 R+ J' t, S/ Z* ^
      e.printStackTrace (System.err);. P. ?3 Q- g* ?3 f0 K
    }
- B, {. p1 Z5 T/ _! |/ a    - M$ I8 c6 {/ n' e8 z/ ^6 y
    syncUpdateOrder ();
! N5 ~6 m! n, O; s$ R9 |5 u- @. o/ o- g* k9 L
    try {
, X: I; q% U: {3 E& @$ {* B  l+ M      modelActions.createActionTo$message
' ]4 T/ m. I& A+ k; m        (heat, new Selector (heat.getClass (), "updateLattice", false));% N- Y; M% m. O5 V
    } catch (Exception e) {& l8 g1 w: W+ ^  J* f
      System.err.println("Exception updateLattice: " + e.getMessage ());  W, T2 q2 D+ c! V
    }  u. f9 I) O+ W
        - ?3 n" P" T' O" ~5 N4 m( ?
    // Then we create a schedule that executes the' w$ v" }  ]  w) T% C" C; c& C
    // modelActions. modelActions is an ActionGroup, by itself it& x; D- [( Q$ T0 Z+ P
    // has no notion of time. In order to have it executed in3 z/ `# X) j6 @2 b( M
    // time, we create a Schedule that says to use the" K1 k! }' g+ q0 O
    // modelActions ActionGroup at particular times.  This
( V: B# {1 E- ~1 o5 e: M# y    // schedule has a repeat interval of 1, it will loop every
% C. g4 k. T: J1 S1 v  `. C    // time step.  The action is executed at time 0 relative to: x* D  E1 X3 r5 `8 |
    // the beginning of the loop.
* V) ]) o1 v2 W( r% K  u7 s" @8 y+ F% S
    // This is a simple schedule, with only one action that is
2 F9 _, g1 z5 a: [; F- U; I, b    // just repeated every time. See jmousetrap for more5 O' }6 |( ^. r* f* l2 D) Y
    // complicated schedules.
5 }5 i$ U/ m7 t( _( o+ {) ^6 @% B  
2 H! O* C- i! j# U1 I% X    modelSchedule = new ScheduleImpl (getZone (), 1);" h8 v2 h, e2 e
    modelSchedule.at$createAction (0, modelActions);
- ?; B5 x. y" n8 @1 M: _; W% J        
, l: v6 U) t+ F    return this;" O7 y8 V) `; M, U, w9 q* g0 o
  }
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