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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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; |8 e: s4 c! c+ q4 |' D" s public Object buildActions () {
+ e' B8 @* r- z4 n  ?    super.buildActions();3 Y4 O! n$ Q; G2 `& I; \3 M& ]
   
! O, f; F0 ?6 b( l    // Create the list of simulation actions. We put these in4 d# c- Z7 x/ S* ]4 t: v: I" \
    // an action group, because we want these actions to be
8 G0 m* [  Q" k+ V) }( d9 }: p$ P/ ?    // executed in a specific order, but these steps should
" w3 O" A0 N( {* v    // take no (simulated) time. The M(foo) means "The message
* C! r, r! q2 n2 O* ]0 v    // called <foo>". You can send a message To a particular& r+ y5 t+ r4 _$ U
    // object, or ForEach object in a collection.
6 c! L9 |. L" v, Y- D2 `) k4 B        ) i) g+ W: q- e: V$ j1 R
    // Note we update the heatspace in two phases: first run/ d9 g9 ]6 a6 B$ y- c" g3 P7 D3 s
    // diffusion, then run "updateWorld" to actually enact the, v7 U% |. a! {4 j- r
    // changes the heatbugs have made. The ordering here is% b  e( r$ x* \
    // significant!& I* T; ^/ y* c& ]  W. h
        
' `+ W! c9 X1 H( E  }5 u* q    // Note also, that with the additional
$ C7 M4 T% s) h6 ^# d" v    // `randomizeHeatbugUpdateOrder' Boolean flag we can4 A% m' F, U5 ~2 `, B
    // randomize the order in which the bugs actually run8 @9 ]# L4 W4 v
    // their step rule.  This has the effect of removing any& v1 z2 ~& U) D! Y$ [  t
    // systematic bias in the iteration throught the heatbug
: F* F8 |1 q/ V    // list from timestep to timestep
. K6 z6 W( K. z7 b/ h+ ^        * t/ ?- ]0 I) y
    // By default, all `createActionForEach' modelActions have! ~) ^7 S, c4 D4 X# b. h3 q
    // a default order of `Sequential', which means that the
0 L* \8 p3 A( m; S1 g    // order of iteration through the `heatbugList' will be9 N$ B) B) p8 D% Q
    // identical (assuming the list order is not changed
6 S4 b0 L+ E1 a8 r% M; e0 o    // indirectly by some other process).
- V( p0 S! E( V! M; K   
& u8 ?* r0 o$ X" B; ]& i    modelActions = new ActionGroupImpl (getZone ());  i9 J: q! N# j' `9 O" k) a: _3 T
: d1 G: y. P+ V
    try {
1 V  [: e' g# T( T      modelActions.createActionTo$message
. r# E* I) x7 R$ o# L        (heat, new Selector (heat.getClass (), "stepRule", false));
# T! N( P( i, W  r* |$ E3 K! e    } catch (Exception e) {
- O  B+ v! H' I0 O- U      System.err.println ("Exception stepRule: " + e.getMessage ());
% o& w0 v, Q! U% ~* a" T6 ]+ W    }% T# U3 E( y1 z& S2 J2 H+ P& G

" V; a, b; f1 M0 p    try {
5 O3 v) ]" }5 f, K. m      Heatbug proto = (Heatbug) heatbugList.get (0);9 ~  L- t; h4 A
      Selector sel =
$ O( Q0 N1 G& _, o! T        new Selector (proto.getClass (), "heatbugStep", false);1 V* C+ U6 m; u0 w1 y2 ]) W3 K
      actionForEach =1 s' ]( D( a% f
        modelActions.createFActionForEachHomogeneous$call
3 y+ q. W8 S! H+ E( ?3 F& t/ ?        (heatbugList,
6 \- H/ q6 M" \" {/ n         new FCallImpl (this, proto, sel," {6 b- P4 V+ [) {2 V
                        new FArgumentsImpl (this, sel)));
8 a9 c+ r1 H' d0 b# M$ k0 f    } catch (Exception e) {/ g6 ?6 F- z: R% w
      e.printStackTrace (System.err);5 t, t6 ~1 [: f5 k
    }
- R  u/ i) C" O( \    " O; i6 G6 P% Q
    syncUpdateOrder ();
& m; Z' x8 W7 \" X: L+ R, a5 Y! z6 K, c4 A+ _/ S( ?6 r
    try {" ~$ B: ?5 Q' r. v3 E
      modelActions.createActionTo$message
1 j: d2 h+ [$ V$ u0 R8 j" |) ^        (heat, new Selector (heat.getClass (), "updateLattice", false));+ C# F; K7 {5 f8 z
    } catch (Exception e) {
0 }% J6 ~; V* u# F$ g& W/ q: Q      System.err.println("Exception updateLattice: " + e.getMessage ());
, ~2 P' L2 x7 L  n( E+ t    }; A" n% b" S9 G' z9 C1 ?  i9 z
        ) @8 y+ M8 y% _
    // Then we create a schedule that executes the
: ~0 n' E/ P0 h, B. n4 d    // modelActions. modelActions is an ActionGroup, by itself it. L$ @2 m4 w; _1 L
    // has no notion of time. In order to have it executed in
. S* H) v& W6 w2 u    // time, we create a Schedule that says to use the- Z' ^7 H0 F. V7 v0 B" l- R
    // modelActions ActionGroup at particular times.  This+ A& H% o% p9 i+ G) U) C; u
    // schedule has a repeat interval of 1, it will loop every4 \. p3 L% m/ M, y# k) L
    // time step.  The action is executed at time 0 relative to
, f( s, e; ~+ a1 e% Y+ }    // the beginning of the loop.7 I2 \3 P4 F+ I6 S3 x* S

5 }* `- C  Z4 ~( a3 j5 ]3 B    // This is a simple schedule, with only one action that is
! {3 M+ w" M: U4 X8 `    // just repeated every time. See jmousetrap for more. t8 \: g: E; q
    // complicated schedules.
6 R; ^8 J7 q' ~( L$ k  
/ N9 }. J; I: O) E    modelSchedule = new ScheduleImpl (getZone (), 1);* I) A3 P% o8 J  H1 [
    modelSchedule.at$createAction (0, modelActions);9 h8 K/ j4 R4 t$ G
        
6 \# L7 a0 v, Q8 V" B    return this;
: g2 j" d- V% Q8 v  v* l  }
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