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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:
9 c) b+ @' A$ e- x4 t  q
) ?1 H  ^6 }1 g public Object buildActions () {" p9 X5 H- a; X4 d( t2 W, k% }9 |% c
    super.buildActions();
3 x, l- n1 y- r2 \7 N5 \# ?5 m   
6 W5 s  |1 l! E$ v" w$ l    // Create the list of simulation actions. We put these in! S, O/ K5 z& W4 _5 L
    // an action group, because we want these actions to be6 D# C3 g6 s) ]2 w$ ?9 O. U
    // executed in a specific order, but these steps should
2 H! Z6 o/ k; Q    // take no (simulated) time. The M(foo) means "The message" C0 O  R, W: E, N3 @
    // called <foo>". You can send a message To a particular: b- z" F4 j) w1 W* m# S3 P
    // object, or ForEach object in a collection.
3 k5 m+ `% @6 e0 n7 m: L4 J9 p        
2 U3 u# X6 J% s- V' G. G    // Note we update the heatspace in two phases: first run  X  Z8 A* d4 a/ I4 K7 `# g$ J
    // diffusion, then run "updateWorld" to actually enact the, K/ ]+ Y. x5 ?  W9 @' |
    // changes the heatbugs have made. The ordering here is
& ^1 l  {  m1 m, Y    // significant!2 w$ m) H- _, j: s2 {& t* c
        
0 q+ e0 N6 d2 d$ e    // Note also, that with the additional5 J  V" R* S) \
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
7 {9 ?" x5 t) t* d    // randomize the order in which the bugs actually run# u$ D/ G8 \8 @* D6 b
    // their step rule.  This has the effect of removing any9 l3 x' t2 a  R- b" {
    // systematic bias in the iteration throught the heatbug
0 D8 y( c+ |; j$ T/ T    // list from timestep to timestep
' }/ Z" F, r/ {' o- i9 l% A        
5 a1 f# ~5 p0 t$ D, D2 H9 ~    // By default, all `createActionForEach' modelActions have
; k1 M: I% m) r- t: q% G    // a default order of `Sequential', which means that the
- h4 H, a8 o$ w. `+ _0 [    // order of iteration through the `heatbugList' will be
5 i! V0 Q- ?$ ]5 E0 v3 s    // identical (assuming the list order is not changed( ?, e: c& g6 U* w9 c- U! T- j+ {+ x
    // indirectly by some other process).
& x1 r% c7 M* e; |6 n    : p9 @" V0 C/ K( P, M2 l1 I6 G
    modelActions = new ActionGroupImpl (getZone ());
8 H3 C5 b) H  A, y
0 h4 O: f4 U+ C+ i7 n, r1 x    try {1 \: C7 R+ y4 ~* N4 F0 ^, v
      modelActions.createActionTo$message6 Q  |. f5 N9 K' o  G& D
        (heat, new Selector (heat.getClass (), "stepRule", false));2 Q5 ?, Z0 y: O1 D
    } catch (Exception e) {
' Y1 n: z6 x/ o) b4 n      System.err.println ("Exception stepRule: " + e.getMessage ());, n0 \. z  y; @' M! H. e
    }
0 N" n/ ~1 }/ R5 |' l4 W+ n
3 k1 b! @; u! @6 I    try {+ L7 Q! w5 k9 c- ]# \2 K6 Q
      Heatbug proto = (Heatbug) heatbugList.get (0);
: ~* q) N' o* l" i* {      Selector sel =
" r$ ~% u  F: f0 F: O/ R1 X) e        new Selector (proto.getClass (), "heatbugStep", false);
. q% l8 n* `0 C      actionForEach =
9 o* z" Z5 `1 _, J% a3 w! a9 h( @        modelActions.createFActionForEachHomogeneous$call
: `5 Y- H8 j' G$ I! P- f: v        (heatbugList,9 R. o9 U, g# D8 t
         new FCallImpl (this, proto, sel,
( F8 v; T7 r/ W! X) R                        new FArgumentsImpl (this, sel)));, p+ t2 N- s* E+ X" b/ `0 m- i
    } catch (Exception e) {
  f1 ]" c. o! B; O& L      e.printStackTrace (System.err);' d7 f1 Z8 @" E) ?
    }1 [" k  h2 c+ \! ]" b. j0 Y
   
& \5 a% `  H$ M. E3 v" k    syncUpdateOrder ();* K8 r- T0 q0 D7 y3 o" w: |" B
' P) D* i5 W- O9 q) ^) t
    try {# Z- d( o3 r1 o. _" {4 N: \8 M
      modelActions.createActionTo$message   o9 {/ @; j9 `) x7 J( t
        (heat, new Selector (heat.getClass (), "updateLattice", false));
  {: j4 {/ T. B7 |    } catch (Exception e) {
8 x9 M+ _3 c5 _  P% X/ h      System.err.println("Exception updateLattice: " + e.getMessage ());
  L& E  L3 @, k8 q- c    }" M7 X( j8 _) ?) `$ Q$ s# P+ N
        
2 q9 k. g: {7 k% C5 f/ W" U    // Then we create a schedule that executes the% P( V, O- G. u3 y
    // modelActions. modelActions is an ActionGroup, by itself it/ x& ~" v7 W+ t: Y+ A
    // has no notion of time. In order to have it executed in
1 t- L2 T& @% Z$ l6 @& r    // time, we create a Schedule that says to use the9 }5 q& |# C* _
    // modelActions ActionGroup at particular times.  This: C& ~! z8 }# S# R8 M, F3 |
    // schedule has a repeat interval of 1, it will loop every
6 W- X4 m/ ?# L1 `! y    // time step.  The action is executed at time 0 relative to+ C. G- T. ~4 Y4 L6 v' X3 F
    // the beginning of the loop.
8 [2 l7 H5 F! J* I' t- Y6 K( o
* V% @7 \# x, c    // This is a simple schedule, with only one action that is
; p) O( g# ?6 y0 O/ L    // just repeated every time. See jmousetrap for more% ]) a8 }, S, n1 V% y
    // complicated schedules.
2 p9 c$ p. U0 {& w+ u9 w9 v& G  $ n/ m5 ]5 V$ R9 v7 j* m
    modelSchedule = new ScheduleImpl (getZone (), 1);
+ M  l' T# l2 r0 f    modelSchedule.at$createAction (0, modelActions);
: [6 |9 h+ Q3 S1 m# z' W% E! f" }9 j        
+ q2 P$ X1 U" I: }: h; O* N4 t; m    return this;
0 Q( L* T9 ~, B  }
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