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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:
8 U: X( m! p/ W6 v4 K0 M  w" n, @1 S7 \& g# o+ ^- d8 a3 f
public Object buildActions () {0 R5 D" ~% I2 ~% y
    super.buildActions();
) S3 {6 b) r' g: g* P7 d    0 o. Z5 X" ~8 `, ~3 R" y  ]
    // Create the list of simulation actions. We put these in
( O! q# n/ W3 U1 ~" w    // an action group, because we want these actions to be
, |' K  l- T3 w    // executed in a specific order, but these steps should' z% j# q% j, y! D" p) s$ R
    // take no (simulated) time. The M(foo) means "The message
9 b! u, N4 k; w+ w# _    // called <foo>". You can send a message To a particular+ |% b& Y5 q  }( M- x4 s: a
    // object, or ForEach object in a collection.
6 T* C: R" a0 I# y( Z3 ?% I, Q        4 f2 B9 z  S( d# @2 W
    // Note we update the heatspace in two phases: first run* o# B4 g7 J4 z- R& E3 S- [
    // diffusion, then run "updateWorld" to actually enact the4 g$ d- h* M! J" X  g5 A
    // changes the heatbugs have made. The ordering here is, `6 z% x1 h/ `2 s* U% |  ], h
    // significant!' }# J+ O* y7 e- E$ N0 P1 B
        7 M* a1 E/ i$ V
    // Note also, that with the additional
$ r5 f& |! z2 G& \6 l5 D9 G    // `randomizeHeatbugUpdateOrder' Boolean flag we can# e3 Z8 w, O3 j
    // randomize the order in which the bugs actually run
1 o$ C( y, T8 I: B* z" x    // their step rule.  This has the effect of removing any
. p5 U. v' u7 N" ~    // systematic bias in the iteration throught the heatbug6 N' c$ Y' z/ j% M) v* u7 _; Q; f2 W
    // list from timestep to timestep, T* _  e$ N/ |- i2 g8 K
        
+ j0 [8 t" i% ^    // By default, all `createActionForEach' modelActions have
' b9 W/ M% |8 G, j; E    // a default order of `Sequential', which means that the. U# w2 ?. f, w1 \, W/ m# i
    // order of iteration through the `heatbugList' will be
7 R$ S) i  g# k, F8 @+ U0 g# V    // identical (assuming the list order is not changed
# p1 S5 c1 L1 U$ z) N    // indirectly by some other process).
, [. v' \6 M6 d   
. k: n3 `' D- `! q7 S) }- |4 L    modelActions = new ActionGroupImpl (getZone ());$ w2 \: ?) g$ U+ c$ L+ _" Q
1 {' }2 I! B' ^1 o3 S& O/ J; t4 I  d
    try {& G! K! p- _; Z0 `3 A3 H+ x
      modelActions.createActionTo$message
* t+ \1 T1 p& M6 Z: d        (heat, new Selector (heat.getClass (), "stepRule", false));
0 o/ e. S  k, }& f! P4 O7 Z" _    } catch (Exception e) {
3 I' u! c, S* @5 J4 u      System.err.println ("Exception stepRule: " + e.getMessage ());1 b" G4 K% u% _
    }) J$ t1 \, i6 H# V! X, R9 E- C
( g/ g/ `" d7 q. e
    try {; c! G& ~3 k" i- v( x7 i" K3 b
      Heatbug proto = (Heatbug) heatbugList.get (0);
: ?4 Y' s. Y4 X( z  z      Selector sel = - @! k4 Z# _7 ?/ |# |7 C
        new Selector (proto.getClass (), "heatbugStep", false);6 h# V' S" Q! n) C3 ?' r( P& X; V
      actionForEach =
. |5 E6 k$ L+ ~3 `( _4 q/ B        modelActions.createFActionForEachHomogeneous$call
, Z4 A8 w. o% w& K5 ~5 m        (heatbugList,' Q7 ~5 t# \4 i: P* l
         new FCallImpl (this, proto, sel,, F5 ^1 d- s* `
                        new FArgumentsImpl (this, sel)));- C5 E. B5 h# S9 T! F2 _$ R3 E$ ?
    } catch (Exception e) {3 ]" y- `! z8 {" s( j5 a4 j
      e.printStackTrace (System.err);
% i+ E5 z. k. k/ B0 b    }/ J6 ?$ Y0 X* `# t! x; R  [1 A& ]2 S
    % t! V( p; Z0 C6 a
    syncUpdateOrder ();7 t& V5 |) o+ o

  c" I  [/ s) w9 m7 w- {; R    try {6 l1 R6 _8 A. @1 @, Y/ F
      modelActions.createActionTo$message ! [# d: S1 G2 s" [4 y
        (heat, new Selector (heat.getClass (), "updateLattice", false));% X, R4 M* B" Q5 p& J
    } catch (Exception e) {
, q- ?7 s( L6 L0 U  V( M7 I      System.err.println("Exception updateLattice: " + e.getMessage ());1 `4 j( E# `) a7 y  \0 }. q: D
    }
) |: P  u" |( g* f! a        
! c2 H: K% C0 `( h    // Then we create a schedule that executes the, ]9 A8 d; ]" y# o9 m, i
    // modelActions. modelActions is an ActionGroup, by itself it
4 f& @. Q! D5 B! p    // has no notion of time. In order to have it executed in8 n, @' l+ S( W- Q* v
    // time, we create a Schedule that says to use the
9 l; o% F  x8 {    // modelActions ActionGroup at particular times.  This4 O8 }0 o+ W* ?" [  `: j( N
    // schedule has a repeat interval of 1, it will loop every- z# I  J/ K( M
    // time step.  The action is executed at time 0 relative to
* v* T8 n' f9 \7 R    // the beginning of the loop., Q- J  y- z* p8 E$ o

1 l; g0 v" G' d+ }    // This is a simple schedule, with only one action that is
5 W" `$ d3 @; H( Y7 C0 f8 K! x6 Q    // just repeated every time. See jmousetrap for more
- Y% l1 \# j# D    // complicated schedules.
( y3 {( D9 g3 h5 U1 }  6 A5 ^- ~+ N: Q/ B( u
    modelSchedule = new ScheduleImpl (getZone (), 1);: z! g' }0 Q4 F& |/ V3 z% J
    modelSchedule.at$createAction (0, modelActions);0 B7 K4 t7 G! W3 X  y: F
        
- p, D$ A: Q. p( g5 D# Y    return this;
- a, w: \4 r: I' t0 N0 C. Z3 s  }
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