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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 () {
. R) n3 I! {& |) P" q( u9 R3 Q( K    super.buildActions();% y1 {& X4 L; A1 D5 n5 T; B, W* F7 N2 [
    ! N- U! r, i: g1 Y
    // Create the list of simulation actions. We put these in/ ]1 ]" \& l; V
    // an action group, because we want these actions to be1 M  o! o* R5 `7 y- V( E/ p
    // executed in a specific order, but these steps should' {* q! Q+ w) I0 T
    // take no (simulated) time. The M(foo) means "The message
6 ?' E9 v1 g# V* b$ J, M9 B    // called <foo>". You can send a message To a particular; G: p: l4 N  ]7 v
    // object, or ForEach object in a collection.& e5 y* m( ^  ?
        
7 m  |9 T+ ~9 j& G    // Note we update the heatspace in two phases: first run' `: ]. A! b2 o% Q' |1 q. U
    // diffusion, then run "updateWorld" to actually enact the2 i" e9 b9 ]$ ]) z
    // changes the heatbugs have made. The ordering here is
7 t4 S# A* }! v7 M/ @4 }: l% u    // significant!2 m8 n3 T1 u- r+ K& {% y
        
+ g( E7 f' A; Y) T3 ~1 p    // Note also, that with the additional# |' N! c% Y- x; |- s# r
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
( W8 R; `# p$ N) v    // randomize the order in which the bugs actually run; g- E0 k2 S9 z/ k( a
    // their step rule.  This has the effect of removing any
9 \7 j* K, O0 {7 ?% V+ ^- v6 P    // systematic bias in the iteration throught the heatbug: L( ~: m$ t% _! P
    // list from timestep to timestep0 B" `% \2 V! U+ k  {- p
        # [+ ^: y, O4 }
    // By default, all `createActionForEach' modelActions have! Z4 i+ B! s- C; U. u
    // a default order of `Sequential', which means that the
# y, K5 f/ u2 r. K' n" t    // order of iteration through the `heatbugList' will be3 K7 d0 L% G. V9 ~2 ]: v# ?0 P
    // identical (assuming the list order is not changed  B$ S8 P1 L" x% u
    // indirectly by some other process).
; ]5 v' [2 m  O5 l. P    - \/ d& U8 B% t# V
    modelActions = new ActionGroupImpl (getZone ());( M; ~3 x4 U  b

) o" c! I! a" d7 Q. \- T& a    try {
1 k7 q% u' l0 d9 C6 M0 u8 n$ f      modelActions.createActionTo$message7 C& o9 \# o; ^  \# D
        (heat, new Selector (heat.getClass (), "stepRule", false));. @9 B: j# I2 J0 Q
    } catch (Exception e) {
. Q: G' g: y6 L1 P) R( d- K, |      System.err.println ("Exception stepRule: " + e.getMessage ());
( \3 b% K( d" v) Q* T. }, ~) k, _3 [    }
# k6 ~$ h, H9 |; D: \7 S7 Z9 ~9 s( ]+ [7 w# ]# }" C% n
    try {  _/ A; L; l) J0 a$ p' [
      Heatbug proto = (Heatbug) heatbugList.get (0);3 @8 ]- z, {9 a% v7 i  S
      Selector sel =
1 V- ]. m# O) L7 ]+ Z: t8 ~! k7 ]        new Selector (proto.getClass (), "heatbugStep", false);
7 _, |4 o' j: h# Y+ J      actionForEach =$ C5 h% Y0 [, ?7 K
        modelActions.createFActionForEachHomogeneous$call9 c6 D3 o9 H# u# o( k2 W
        (heatbugList,8 I! a4 H6 m! Y
         new FCallImpl (this, proto, sel,
( A- c* f5 N) t                        new FArgumentsImpl (this, sel)));0 n. i, j4 K0 X
    } catch (Exception e) {2 V/ g. W: r  l; B$ ]
      e.printStackTrace (System.err);
% u  Z. w4 [" o( ]: H( Z! ?    }
/ @, P5 Z( H, Y3 m/ D; q    , e& ^4 T% \& @4 C
    syncUpdateOrder ();6 j4 n5 w. Y) d. i* F& D0 [% p& ~7 g
) K/ g+ b; j' z
    try {  K: n* ]* \$ A2 |8 a
      modelActions.createActionTo$message
, Q: e& j2 G  H: I( }6 P        (heat, new Selector (heat.getClass (), "updateLattice", false));
, r' [, w! N0 i5 M3 P2 T6 h    } catch (Exception e) {2 Z# F) \. y* ^2 i8 O
      System.err.println("Exception updateLattice: " + e.getMessage ());  s9 [: F, ^8 L- V3 A1 Y$ {% m
    }
# g5 z" u3 s; k9 |        
+ h6 E' |# {2 M: C' k! P, n    // Then we create a schedule that executes the# [% C5 l8 }& o6 l8 l5 q
    // modelActions. modelActions is an ActionGroup, by itself it
0 J+ u) P5 f8 r; o* r& i" Q    // has no notion of time. In order to have it executed in
1 |+ t5 F  L9 K( {    // time, we create a Schedule that says to use the/ t$ Y( D& i% }: Q$ b+ g' p, h
    // modelActions ActionGroup at particular times.  This3 P. e3 ?, i; G
    // schedule has a repeat interval of 1, it will loop every6 y- o, N0 ^0 S8 K7 c+ f
    // time step.  The action is executed at time 0 relative to* f9 |* l! f- w5 z% ]
    // the beginning of the loop.# _1 O4 K4 u, |5 M! W- P  \1 ^
! J& m8 |" a5 S3 d) g" f$ n" [+ X' X
    // This is a simple schedule, with only one action that is
5 t9 }& n# P  x- K3 J- Z. l+ i$ B- u9 A    // just repeated every time. See jmousetrap for more
! V* [/ O$ ?7 p+ N    // complicated schedules.. t# G5 v$ t) ]+ g; D, a
  # U9 ^2 U& x# [
    modelSchedule = new ScheduleImpl (getZone (), 1);
& F7 P7 L* m& v, ]  {) A    modelSchedule.at$createAction (0, modelActions);/ l( o8 J$ h* E
        ( N: a1 U! w- z2 }3 P
    return this;, {" F0 j: c8 G9 l) R' x- P3 Q3 ~$ N
  }
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