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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:
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public Object buildActions () {
4 N/ {! v$ g& A; V* M4 Z2 ^. A* ]    super.buildActions();# W4 q, O- k- X- {1 I
    9 D/ E. s# G5 a! ?4 q
    // Create the list of simulation actions. We put these in& p' X" a% u% `! V9 \
    // an action group, because we want these actions to be
- v8 S( ?. c  x7 O0 `8 g    // executed in a specific order, but these steps should( P- u& f8 g+ u& [
    // take no (simulated) time. The M(foo) means "The message
/ v( M& u, R- r. W4 q. U    // called <foo>". You can send a message To a particular
: y/ k  y" l% d" N& V    // object, or ForEach object in a collection.$ C/ _0 T* T- Q1 d: G1 S
        
6 o% t! E7 h- K0 b! d& \* o3 s    // Note we update the heatspace in two phases: first run
7 b6 E8 a& K8 \/ O    // diffusion, then run "updateWorld" to actually enact the: b& i! n1 ?# I& n7 ]
    // changes the heatbugs have made. The ordering here is
, R4 t' q$ S7 C3 u0 F  U9 G    // significant!( g# K3 I& R  w
        
3 `) p9 `5 A5 m* D    // Note also, that with the additional
# M' D2 B+ K8 t    // `randomizeHeatbugUpdateOrder' Boolean flag we can
+ L# A+ D  ^; B( r' t4 z    // randomize the order in which the bugs actually run7 K) |* _; h8 J" Y; j
    // their step rule.  This has the effect of removing any
/ N9 p2 B$ b7 A$ |    // systematic bias in the iteration throught the heatbug+ c2 X* U% n; m0 K: X+ ]$ r; w% M
    // list from timestep to timestep0 }" x- |. W2 h' R  I! b6 n5 U
        : D0 A9 [" B0 ~- i: {* i
    // By default, all `createActionForEach' modelActions have' O+ s# `. f5 i; v! L3 t' G- i
    // a default order of `Sequential', which means that the8 D/ k9 w" U8 w! o1 q) q
    // order of iteration through the `heatbugList' will be9 Q; R$ R; J4 e" Q3 Q4 k2 X8 e
    // identical (assuming the list order is not changed9 }/ Q! h" }, D& z/ c, B) z- L
    // indirectly by some other process).: j0 ^; g7 C' ^* C* G. B
    % I. K1 f( N  s# H* j( H8 m0 O! o
    modelActions = new ActionGroupImpl (getZone ());& N5 t( y, l/ a9 R4 _
" x: U5 r* a/ l" Z5 M
    try {& ^* `- X! V) z2 Z
      modelActions.createActionTo$message
! s$ {! x) x) Q        (heat, new Selector (heat.getClass (), "stepRule", false));
  ^& v% {5 A! W7 G    } catch (Exception e) {6 H# n* Q3 h  p; l, e4 C
      System.err.println ("Exception stepRule: " + e.getMessage ());+ w; h4 x/ `7 Z4 O  N
    }5 {) J' Y6 j' a& |: N, {% C" p& D4 y
# O. {+ S3 ]7 r; Q7 v
    try {8 `; M+ B5 e  |7 ~" ^; ?
      Heatbug proto = (Heatbug) heatbugList.get (0);
- j) y2 s1 `- x3 T0 j; }      Selector sel = ) A7 ^3 Y$ {& J" k
        new Selector (proto.getClass (), "heatbugStep", false);
7 e8 [% G. n( B! D& h6 ~7 V      actionForEach =
, \2 G9 q% R* R6 A; R/ y4 I        modelActions.createFActionForEachHomogeneous$call
" t' O+ d/ @, s- H# P" A0 J3 n        (heatbugList,
' `$ t7 Q6 x6 I1 [+ _         new FCallImpl (this, proto, sel,
6 f' i3 q( d: W4 I) Q& o; e                        new FArgumentsImpl (this, sel)));. _( F, r8 Z# A/ x* @
    } catch (Exception e) {
1 q, s( z" t6 @* \% M. _& U      e.printStackTrace (System.err);' t* U2 y0 ~* R4 ^7 m
    }
# d: E( `' y+ V; Z    4 j8 N/ l8 L0 Z4 p% c" U5 v! D( t, V
    syncUpdateOrder ();4 m! \, H9 z1 Z& s2 g& U$ Q
( I7 N. p' c! S  }7 I
    try {
# o! ?9 S" n: X7 v; z      modelActions.createActionTo$message
& G6 k$ K  q9 P' e        (heat, new Selector (heat.getClass (), "updateLattice", false));7 P4 G/ R& D4 R9 J% a$ |! X
    } catch (Exception e) {
5 _) j1 C, F+ O8 p$ X      System.err.println("Exception updateLattice: " + e.getMessage ());
$ a+ U* |2 w) V    }/ {9 k4 q& ?$ ?5 T6 B9 p
        : j3 F7 p; O! d: t9 x3 e7 Q
    // Then we create a schedule that executes the
+ R( C+ `9 F0 ^4 h: U6 p6 E    // modelActions. modelActions is an ActionGroup, by itself it
) I5 g' b4 N- R7 x    // has no notion of time. In order to have it executed in
2 B/ b/ z1 k/ H/ s* k    // time, we create a Schedule that says to use the
6 `9 e( A, H! O" |    // modelActions ActionGroup at particular times.  This
# J1 X3 p& C* a, X6 K    // schedule has a repeat interval of 1, it will loop every5 i/ u( X( ?, S4 }
    // time step.  The action is executed at time 0 relative to* n1 m% @) i# z' _
    // the beginning of the loop.' {9 w. E( d2 i3 L& z9 d

8 R& Q4 K* o; w/ B    // This is a simple schedule, with only one action that is
  c* R+ C. k! z    // just repeated every time. See jmousetrap for more; n- b; O5 q; n
    // complicated schedules.
. O7 \4 [& [# Q, s  
  D# l; ^6 ?: H* j; }    modelSchedule = new ScheduleImpl (getZone (), 1);' n/ P, V, M( r. U9 H# D
    modelSchedule.at$createAction (0, modelActions);
" Y0 _* p  Z! j' G        
3 o; U; V! n  T7 s3 h. m, w    return this;
4 t8 i! t0 f+ \+ p- i. n  }
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