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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:
# X& @; n1 W9 P% B2 u4 x$ b# U3 W& ?2 b7 m: ~9 e9 S
public Object buildActions () {( u4 q  o$ }& G
    super.buildActions();! L' g2 T  t" p+ d
   
* A0 P8 _9 S6 f7 R- ^9 T    // Create the list of simulation actions. We put these in' o; i# z, Y7 K% d
    // an action group, because we want these actions to be
' P! r! ?; H- e: M: ^, l% I6 j    // executed in a specific order, but these steps should- t. {1 Q2 _+ K6 I
    // take no (simulated) time. The M(foo) means "The message
- e7 J& s! N3 U7 a+ F, i    // called <foo>". You can send a message To a particular$ G' E: _+ D. j% U3 a" p0 v+ w
    // object, or ForEach object in a collection.9 M+ l- g' D0 f' h! q  a. K
        
( V, @0 V% x; }# m" f    // Note we update the heatspace in two phases: first run" m! B8 w0 L+ N
    // diffusion, then run "updateWorld" to actually enact the
+ Z$ S; i) }" Y# L2 T2 B7 }4 ?    // changes the heatbugs have made. The ordering here is
1 P: l; @3 e2 l1 f" O" ?    // significant!
1 [% P: G* G5 f% h: |        4 y( j  T+ S8 T3 H" G' U
    // Note also, that with the additional9 ~- y1 Q* |' K" b, I4 w
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
+ Q; R) D0 W. X) r8 f* e$ |    // randomize the order in which the bugs actually run: `( K+ ~6 W3 o  [; J
    // their step rule.  This has the effect of removing any
9 Q8 U1 n& |9 k' L% n    // systematic bias in the iteration throught the heatbug
9 w4 Q% n( u1 {# C    // list from timestep to timestep, _/ l! m6 C1 I2 T; @/ Q
        
) A/ E* O- g+ u! j8 {0 d! d$ [    // By default, all `createActionForEach' modelActions have* z( c9 b* `  x
    // a default order of `Sequential', which means that the- y; w8 K$ ?9 E! x
    // order of iteration through the `heatbugList' will be
) p; m0 i$ g3 `7 Q    // identical (assuming the list order is not changed/ X) S5 ~# H6 R' s
    // indirectly by some other process).
" N' h8 x: |! J( T  `6 N4 t    / q$ V% D( ?/ j8 R  m& g$ M& O
    modelActions = new ActionGroupImpl (getZone ());8 R$ W1 l* h: e$ P3 y1 [

. _9 w  j' n0 K    try {
! B2 q; D3 e$ \% }$ Y" v3 X6 ^      modelActions.createActionTo$message
' s: {4 _* v, S/ J: [        (heat, new Selector (heat.getClass (), "stepRule", false));
: n! ^6 h; q/ |& V+ n    } catch (Exception e) {+ s$ i" u9 B0 f9 }$ q( k% c* P
      System.err.println ("Exception stepRule: " + e.getMessage ());6 N* x: `, ~0 |' c
    }- b" F: a, C- S4 j9 ~3 Q) Y

% H8 E, L4 [& t) x, R    try {
: {/ U4 ~% M) ~7 D      Heatbug proto = (Heatbug) heatbugList.get (0);4 {( J, o, ^) {. j
      Selector sel =
; P3 i3 K/ ], m        new Selector (proto.getClass (), "heatbugStep", false);, K# d0 b# T. Y) m: L, D; ^
      actionForEach =* E" Z2 i) H* E
        modelActions.createFActionForEachHomogeneous$call; q* s) H, `4 ?* @" r5 R
        (heatbugList,! b7 |9 x6 p& M" T
         new FCallImpl (this, proto, sel,
, j+ @! Z0 n! O9 c; v) ^, o0 s                        new FArgumentsImpl (this, sel)));: k8 L6 h: J5 k! a$ c" w1 f
    } catch (Exception e) {
1 p! i) @4 ^7 k% ~/ l      e.printStackTrace (System.err);
! r) V6 H7 ^8 ^, d    }
# Z5 Z$ V0 u: Q" b    & m2 ]: y- b/ [  H" }% Z
    syncUpdateOrder ();% h& O( [" K" k

9 h2 F+ L2 u% X( a    try {7 I! s2 l: c7 G9 s" U
      modelActions.createActionTo$message 8 v& }6 L( Q! L3 X. i) f
        (heat, new Selector (heat.getClass (), "updateLattice", false));
) x  X" b  }$ _6 d! t, N; |    } catch (Exception e) {8 J1 \( H% `! n$ B0 F
      System.err.println("Exception updateLattice: " + e.getMessage ());
9 W6 ]$ M3 j: w6 Q9 A& ~7 S    }+ L7 _) r1 n% r
        
9 Q- e+ Z0 g, l; p' w# o8 H' O    // Then we create a schedule that executes the$ s2 v& m* Y$ u8 u1 L' r# F+ x
    // modelActions. modelActions is an ActionGroup, by itself it
6 a# d& I! K- I2 X% Q    // has no notion of time. In order to have it executed in% t; d" `2 {7 a  f' ?
    // time, we create a Schedule that says to use the) @" H3 e5 S" ^; u. _' X0 V
    // modelActions ActionGroup at particular times.  This6 y- d# V$ |3 \) T1 e* y
    // schedule has a repeat interval of 1, it will loop every
: J2 Q4 q' @/ D    // time step.  The action is executed at time 0 relative to  r+ U% m' V! g/ H
    // the beginning of the loop.  q8 b- Q9 G5 {
& z8 x7 @* F- }) v
    // This is a simple schedule, with only one action that is$ G* k7 r. _6 c2 c
    // just repeated every time. See jmousetrap for more
) P$ K2 C7 y2 M( I$ A5 t: a% F    // complicated schedules.6 J3 c9 G' N8 A3 J& j# A7 O
  . X0 D( f2 y% Y6 w* y; k
    modelSchedule = new ScheduleImpl (getZone (), 1);
! j& J* g* R! k# S4 T3 g* Y$ N    modelSchedule.at$createAction (0, modelActions);
9 ~4 g6 Q$ }( s/ X& J8 V        8 c- O8 E  I, j
    return this;1 B9 _; Z3 v; f) N, d- r
  }
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