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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:7 G7 m4 Y$ j3 H! i, v
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public Object buildActions () {
% g, G" z% f# s    super.buildActions();
" f) Y4 y8 p) d6 G, M& H    - l" _" @( t! ?7 Z7 ~0 Z/ D" B
    // Create the list of simulation actions. We put these in
7 U, k& l  y0 ?; H    // an action group, because we want these actions to be! j3 P% y) e5 r0 F- e1 m
    // executed in a specific order, but these steps should4 F6 R. @8 j. z1 `% f* H
    // take no (simulated) time. The M(foo) means "The message1 v( e7 C, @( P& l% Z$ z
    // called <foo>". You can send a message To a particular
0 o2 y5 B, U% g; |4 ]4 A    // object, or ForEach object in a collection.9 U- i3 j( z! h! J$ R2 p' |' S
        
/ Z. h5 D7 }4 G3 ^' b. a' I    // Note we update the heatspace in two phases: first run; w2 |. p! Q/ Q9 m) c  `0 A* K
    // diffusion, then run "updateWorld" to actually enact the2 K) s+ _' e* V- g0 J' b/ s( v
    // changes the heatbugs have made. The ordering here is  ]  V5 @  f& s/ b3 ?/ z2 O
    // significant!6 \' C" H' W# ?- N
        ; p1 E6 I; S. w3 W6 D
    // Note also, that with the additional
7 K5 z' e5 m  j9 i    // `randomizeHeatbugUpdateOrder' Boolean flag we can% b* `9 k1 S$ s' R& i
    // randomize the order in which the bugs actually run- L2 |. \  e- r6 W+ Z4 U) f
    // their step rule.  This has the effect of removing any9 J' w4 \3 Q* a; }
    // systematic bias in the iteration throught the heatbug  D$ c$ U9 Q( |3 c. e
    // list from timestep to timestep
* X9 w+ Q; y2 ]8 p        
  }" q1 c* t/ u- b: S    // By default, all `createActionForEach' modelActions have- |) V/ x8 R0 ^) P
    // a default order of `Sequential', which means that the
3 T2 t0 ^% @' J9 z    // order of iteration through the `heatbugList' will be
3 F3 ^1 i8 L- a; z' S    // identical (assuming the list order is not changed
6 y  C0 a9 ~) ^$ M* |- d    // indirectly by some other process).
& q5 O( R. J# }7 t- s    5 Y; m  o+ |# v" \7 z! m: q. L
    modelActions = new ActionGroupImpl (getZone ());
, {+ |2 D4 C  ~  }- u' `- V7 K9 H6 Q
    try {
, A+ y; q& A" q* L  E      modelActions.createActionTo$message
1 e1 I- u6 |: c/ \        (heat, new Selector (heat.getClass (), "stepRule", false));
/ u4 v" S8 n3 n, g8 O    } catch (Exception e) {: O' S* m3 ?+ [5 J( y- c2 b% S
      System.err.println ("Exception stepRule: " + e.getMessage ());
4 J% n* F8 }! v8 T    }
2 q; ^1 q* R2 H5 I
. M2 G9 u. T- _: `( l1 W7 ]5 ]    try {) o4 v# C& y- z  h0 ?
      Heatbug proto = (Heatbug) heatbugList.get (0);: [5 D( J1 n$ k( V- q3 H( d
      Selector sel = / c9 U7 Z5 A- l8 F) d" e" L
        new Selector (proto.getClass (), "heatbugStep", false);' {+ e3 t3 J! t7 s$ [9 E) o/ m) |6 ^
      actionForEach =
* n3 R- {5 B5 K4 M! B7 }$ S9 Y& F        modelActions.createFActionForEachHomogeneous$call7 d* d. g5 b( ?- K1 C( F3 z
        (heatbugList,0 e) [# F/ A/ S' ]& o) U
         new FCallImpl (this, proto, sel,6 T, [' h$ |* u" M' Q- ~
                        new FArgumentsImpl (this, sel)));
! r- ?- v& C1 Y& S. h    } catch (Exception e) {  X; U2 W5 i" V* W) `+ @% p4 }- ]( i
      e.printStackTrace (System.err);
. N( i, A# _: i7 c    }  t/ L, }0 m' Q5 v/ g
    7 R. m0 f# P- w( }  S/ [" D
    syncUpdateOrder ();( R! o8 H0 D( D# G6 Q; ^: K
2 q. t+ T7 H3 q/ l" w- Y6 W$ ?7 b
    try {
( q# G3 L# }  {2 M* r) s8 `      modelActions.createActionTo$message
' l4 ~$ N' |' S5 l" d: Z        (heat, new Selector (heat.getClass (), "updateLattice", false));8 w& i; T; Y9 T. a
    } catch (Exception e) {
6 z0 U9 y2 {* T' o/ S6 R; A6 B      System.err.println("Exception updateLattice: " + e.getMessage ());
$ C3 N# `& w5 W    }
3 o8 U" h$ M% L7 X# D) t7 K: q. I1 Y& I        2 Z0 X1 b; S0 ~# D3 j) ]3 F9 T
    // Then we create a schedule that executes the
2 i6 P0 x  U  ~2 H3 Y# m* j. a) [1 F4 ^    // modelActions. modelActions is an ActionGroup, by itself it7 U0 w4 F6 G0 z1 \
    // has no notion of time. In order to have it executed in+ P2 I2 x3 h* U8 j& Q- ~
    // time, we create a Schedule that says to use the" R* e( M' P# j4 C0 m4 h" Q+ f" F4 p
    // modelActions ActionGroup at particular times.  This
% I! F5 ]$ ^" D: a  p    // schedule has a repeat interval of 1, it will loop every' k0 C+ c& {/ T6 T8 t% x+ [: z
    // time step.  The action is executed at time 0 relative to& Q+ V( ]. R4 o: y3 \) c' d% G) B8 U
    // the beginning of the loop.! t8 B, M" |- u$ C* r, S
4 o- G9 e# R0 f8 v/ c- o( f, `( d* q
    // This is a simple schedule, with only one action that is" @1 h% y3 `' m3 }' U
    // just repeated every time. See jmousetrap for more& C% I' s! z. n7 k$ i; N
    // complicated schedules., f6 x; B. m2 Y! ~- U( l* k! x1 }' z1 @
  . Z9 t" G6 U. m: s# r
    modelSchedule = new ScheduleImpl (getZone (), 1);! E1 n$ ^3 a1 S2 o
    modelSchedule.at$createAction (0, modelActions);
( t& I% R1 |% A        
1 f$ _2 z) `: C1 y, Y7 }2 S8 P# Y    return this;; S0 c  [# r) U3 Z
  }
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