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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:; r7 S" [' r! f# B

) f7 a/ }* o& b1 Y  K public Object buildActions () {
8 @6 Z+ y0 C$ V0 Z    super.buildActions();: g/ \9 X; N+ L* L8 Q( @
   
' x, N" P; [, m5 S8 @4 l    // Create the list of simulation actions. We put these in6 n( Z  b: W0 X( {
    // an action group, because we want these actions to be" K7 x$ \0 P% n. b: i
    // executed in a specific order, but these steps should
, [0 m; c! q. T- k' q# r+ T8 Y    // take no (simulated) time. The M(foo) means "The message
) j' M9 r. V# u2 ~- h    // called <foo>". You can send a message To a particular
, q4 C6 I5 |* i( }7 k    // object, or ForEach object in a collection.
/ _. C, e$ t7 s        : S8 R1 _% T- O4 z" n& K  [9 C' A6 h; f
    // Note we update the heatspace in two phases: first run8 s. T) M! f( J( |1 R5 q
    // diffusion, then run "updateWorld" to actually enact the7 b. s. b" p) v4 Q! j
    // changes the heatbugs have made. The ordering here is
5 }% e6 X- I6 `4 q, P    // significant!
% ^  E% l. H5 B9 z! X$ K( p( x5 {4 s        # |% H0 r  E0 k5 k( L! c
    // Note also, that with the additional9 W9 x' C! f1 C0 Y( X
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
8 n3 b; q) p# |3 E' |    // randomize the order in which the bugs actually run
& `6 r5 ~, Z. g( B0 y6 J7 P    // their step rule.  This has the effect of removing any
  L3 K$ Q5 N1 D5 a) t6 i: z    // systematic bias in the iteration throught the heatbug
4 W  V! Y! n# ^2 P- b$ m  f    // list from timestep to timestep; a4 k# C: w: `' I' r  Z! ]
        
. o$ q  ]$ W4 U% c0 b3 A    // By default, all `createActionForEach' modelActions have
+ }5 n" `( w. q: L: O    // a default order of `Sequential', which means that the1 y0 ~$ G' l# O, E, S: q0 U
    // order of iteration through the `heatbugList' will be
) T) o/ Q1 t7 u1 j    // identical (assuming the list order is not changed
% H) T  [; M3 I7 _9 n6 P8 O2 H    // indirectly by some other process).
4 g5 Y* `5 F% y- {8 H5 i) f9 @    + H) w7 L! J& ?0 T
    modelActions = new ActionGroupImpl (getZone ());
/ D8 H+ F. x) l& f# v1 I) b7 ]& ]2 |7 K2 Z& e9 N8 q6 m
    try {
+ y2 c5 }1 d8 Q; v      modelActions.createActionTo$message
4 S* F% L: ?$ v6 }        (heat, new Selector (heat.getClass (), "stepRule", false));! ^( R  `; s: G, E/ H
    } catch (Exception e) {
0 p! }9 [, b3 ~  H      System.err.println ("Exception stepRule: " + e.getMessage ());
: m( I5 U. U$ V. m3 ]    }$ h( z. F, H0 n# Q0 @

; b3 ?* }! R3 G    try {# H6 O' c, D( O- y) t
      Heatbug proto = (Heatbug) heatbugList.get (0);
& `/ t6 P* [' O3 ^9 R      Selector sel =
. ~  _3 M* L  z0 @6 O  w$ {        new Selector (proto.getClass (), "heatbugStep", false);$ c' h0 h( i! Z
      actionForEach =
* n% B* i! B7 H' U        modelActions.createFActionForEachHomogeneous$call4 j+ p( G; E$ I# T" C
        (heatbugList,
) ]8 z8 F9 c7 B' }         new FCallImpl (this, proto, sel,
& Z: `" i! L* U/ w, W3 D: ]. g                        new FArgumentsImpl (this, sel)));
6 ?" C. B: m+ i9 @    } catch (Exception e) {
) z  ^: ~$ x6 D      e.printStackTrace (System.err);
8 B( M6 V  p& g, e& A    }9 x8 o- B3 _' m* d  m# F* t
    + b: |! W$ ?& Z9 t% ~
    syncUpdateOrder ();" u  v6 \3 E' x

$ g( c4 N% s) p    try {
/ N* d; Z3 ]: c1 j5 y& g9 Y* m7 A      modelActions.createActionTo$message # w2 G* c" q* p9 K" z* `3 d
        (heat, new Selector (heat.getClass (), "updateLattice", false));
8 z  m/ R. R$ C+ b* v( r5 J4 {2 L    } catch (Exception e) {' O! }) F& Z/ a, U, z# U8 m4 W
      System.err.println("Exception updateLattice: " + e.getMessage ());
& Y; h! y: r/ ?6 e& _    }
! W' W4 q4 z3 i4 s7 I% b        
- t7 X6 P+ c3 g    // Then we create a schedule that executes the7 _  ~7 f: L6 t
    // modelActions. modelActions is an ActionGroup, by itself it' b, {0 |9 l" k/ z9 N! o" D
    // has no notion of time. In order to have it executed in! P' T4 r( w# e0 N3 R5 i9 k
    // time, we create a Schedule that says to use the
5 t4 c3 u  q, o# C. E' G$ k    // modelActions ActionGroup at particular times.  This6 i7 v7 e! o* {, |! m! P: v
    // schedule has a repeat interval of 1, it will loop every2 `/ b' T6 E( u4 {9 [1 Q
    // time step.  The action is executed at time 0 relative to9 I; {6 l8 r0 p
    // the beginning of the loop.
8 M7 E& Q+ D: T, N) a: ?
) p3 [* U% o! Q4 e" o' Q; ]8 b    // This is a simple schedule, with only one action that is5 E" c# o) |1 Y7 Y  E/ N
    // just repeated every time. See jmousetrap for more% `4 l8 Q- C$ q' _$ p
    // complicated schedules.
& \! A) o8 l4 Q( P9 p/ M  
: W2 z  U+ C, S4 K0 ]0 O    modelSchedule = new ScheduleImpl (getZone (), 1);' c2 \0 b  d; d
    modelSchedule.at$createAction (0, modelActions);* \$ S# j0 D  d3 {
        * F+ h5 O% F( \; d  ?: P- `5 }! z: [6 Q
    return this;) [5 o8 e  Q6 u3 c7 Z
  }
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