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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:
3 I3 D3 w! F' b" d& V
8 n0 A* D& ?' f0 k" s* I public Object buildActions () {& d( e: |  a( Z$ j+ i
    super.buildActions();& |% d' V# Y3 ^" l% I. T
    & A9 n) _  x- V% H
    // Create the list of simulation actions. We put these in
9 c/ b. c  V: C8 ~( B) Q' U' y6 L/ S$ F  t    // an action group, because we want these actions to be8 u1 X8 h+ K/ J
    // executed in a specific order, but these steps should
4 k# v( v9 F7 n5 o2 [' R; E    // take no (simulated) time. The M(foo) means "The message0 t% `$ F7 K: H; |
    // called <foo>". You can send a message To a particular8 A& o/ s  ?2 K& Q
    // object, or ForEach object in a collection.0 n  }4 c* l2 x
        
, o4 \" l) y" s! u6 v  J( N: ]    // Note we update the heatspace in two phases: first run6 [. b2 \/ T/ O9 ?. M
    // diffusion, then run "updateWorld" to actually enact the' }( a. }- y4 T/ N! s+ y
    // changes the heatbugs have made. The ordering here is
' Z0 u4 d( ]8 N' x/ _. Q+ l    // significant!5 A" m1 H5 l5 O# B' y
          L1 U/ {8 |9 O* n2 z5 \
    // Note also, that with the additional
$ r+ V8 c& J9 }/ l! S/ C  `7 C0 A    // `randomizeHeatbugUpdateOrder' Boolean flag we can2 o" l! w* q: `% H. I& z) w; z
    // randomize the order in which the bugs actually run' H( a! Z# {4 _% E. G
    // their step rule.  This has the effect of removing any) H* U, k2 i5 O# D% {. z8 P
    // systematic bias in the iteration throught the heatbug7 L1 N) _' b6 [
    // list from timestep to timestep
+ G' m+ K# u  d2 g9 O; T: d/ F" b# ^        , d  ]& M$ Z) A9 B
    // By default, all `createActionForEach' modelActions have5 l: y# _! r8 Z
    // a default order of `Sequential', which means that the
$ r5 T2 d4 w& _) y- w' e    // order of iteration through the `heatbugList' will be
4 P- `* D( Q+ X9 L+ `1 i0 S- v    // identical (assuming the list order is not changed, j1 h% u. r8 N/ q2 Q4 ?
    // indirectly by some other process).& Q5 N  z2 B  w; c; b4 z) L
   
  q, N% v! t: u4 l7 t. _7 |# f0 W    modelActions = new ActionGroupImpl (getZone ());
& `  Q# M3 L& D2 b
; j! |( k+ o) H9 k* K+ D2 Z' i4 o    try {/ }$ E; |  [& T1 }
      modelActions.createActionTo$message4 H6 ?% \! |) w/ o; L
        (heat, new Selector (heat.getClass (), "stepRule", false));$ C" h. P/ {; v! r3 S) V/ p1 s( d& l
    } catch (Exception e) {( [5 o3 u; n" ]  {, D
      System.err.println ("Exception stepRule: " + e.getMessage ());6 e' O" d* r1 t) c
    }
8 h9 e3 b' N! v  a% t5 t% Y, w+ E% O) `9 ~
    try {
! P. M0 t0 a' D      Heatbug proto = (Heatbug) heatbugList.get (0);
1 Z3 I: `, N1 P      Selector sel = % }, Y. S% O0 T( L& Y+ f  z
        new Selector (proto.getClass (), "heatbugStep", false);) A0 {; [, |8 P9 Q
      actionForEach =% E6 M" B- ~0 _3 k8 L
        modelActions.createFActionForEachHomogeneous$call
1 W2 t: j, b' u        (heatbugList,  f# l; C, |9 {, H2 G
         new FCallImpl (this, proto, sel,
! d& Q5 P7 M3 \- I3 ^                        new FArgumentsImpl (this, sel)));
9 D0 I8 h- B) @8 V7 G/ x% Q    } catch (Exception e) {
  O% _1 C4 S3 m( r      e.printStackTrace (System.err);
# n2 {4 a6 R# m/ D* V4 m! c    }$ k, G* H6 L8 x- P3 m/ B
   
+ `, G& i& r; A    syncUpdateOrder ();7 h% n+ P3 w1 P/ M. L
# E+ X9 R! C* o4 w, N1 k$ [
    try {
: f/ [$ R% [+ l' `! e$ F, h: d      modelActions.createActionTo$message , Z2 `% a) b/ {
        (heat, new Selector (heat.getClass (), "updateLattice", false));
: y6 y9 {+ C: k" e    } catch (Exception e) {
4 _. q+ v. ~& w. b- G      System.err.println("Exception updateLattice: " + e.getMessage ());
. v: v( R+ q% \& L! ?! b    }, X$ f6 J+ m! O) r3 H& ?
        4 I+ h9 q) r5 O' Z5 Y5 i/ y
    // Then we create a schedule that executes the
" ?" u( c0 S+ b- i! S9 b8 T    // modelActions. modelActions is an ActionGroup, by itself it+ D" |( L9 K! i, i: \& T& a
    // has no notion of time. In order to have it executed in
, e' \; f* K6 _! i: G8 ]    // time, we create a Schedule that says to use the
6 T3 z$ z6 Z# }3 O* p. W    // modelActions ActionGroup at particular times.  This) j4 o* Z- E; e
    // schedule has a repeat interval of 1, it will loop every* [" U4 E& S9 V$ q6 H! [$ o
    // time step.  The action is executed at time 0 relative to
8 @, l' |/ T$ L% b$ S2 h0 \    // the beginning of the loop.# ?. g7 g( r3 c; m
+ X- I# }6 b8 x; o0 M3 a
    // This is a simple schedule, with only one action that is  \8 h/ s* _& R+ w
    // just repeated every time. See jmousetrap for more
. B' s6 [; }+ V    // complicated schedules.& c8 h2 c8 J; I/ D
  . z! z$ e4 O. E7 g) u
    modelSchedule = new ScheduleImpl (getZone (), 1);5 T" x8 H8 Z1 Y: N' n% L/ d2 n
    modelSchedule.at$createAction (0, modelActions);+ d8 [; i3 ~+ X& e
        
. A7 V! q7 R4 V    return this;
# T6 n, a1 j4 v- W7 m$ F/ Z9 h  }
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