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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 () {0 |/ V! c, ^. _# A* N6 E
    super.buildActions();7 F4 i( V2 ]: B+ d0 W
   
6 V, Y- D$ n) R& x6 z- h, g    // Create the list of simulation actions. We put these in
% o! y. K3 s9 F    // an action group, because we want these actions to be; F- {3 }+ k) ]( X$ l/ _
    // executed in a specific order, but these steps should
% b: q) d7 ?: g& J9 o4 Q; W    // take no (simulated) time. The M(foo) means "The message! K5 C4 j0 g: E, R/ ?+ X8 A
    // called <foo>". You can send a message To a particular. ?* ^. {: f% Y) d: _# P* w
    // object, or ForEach object in a collection.
9 L# E! I7 Y. j. a        
5 f2 Y9 c$ j3 B6 E$ e0 s! Q# ]3 g    // Note we update the heatspace in two phases: first run
: u. R/ O! m$ w9 h) i    // diffusion, then run "updateWorld" to actually enact the& ]9 [) O  F" n; a% \6 [3 p6 A
    // changes the heatbugs have made. The ordering here is
8 E' x. o) H( u) F; J' y$ Z    // significant!
! F% ?0 o1 E! D, c1 b$ |        
; c6 p$ Z# C3 _: o: y    // Note also, that with the additional
. R- l- H" q* Q1 r! F' z) _    // `randomizeHeatbugUpdateOrder' Boolean flag we can
4 c$ T- G, ]2 G    // randomize the order in which the bugs actually run- p1 u* I6 \9 e- |) Q
    // their step rule.  This has the effect of removing any
5 ?% ]$ g3 j! ^. h+ j/ W% @    // systematic bias in the iteration throught the heatbug
+ R2 p1 w- W8 K- Y, M) K    // list from timestep to timestep
! @2 n8 v! C! F- A% w% c        
! D+ c. t% \( F9 ^- }  d    // By default, all `createActionForEach' modelActions have
: r& Y" ]/ t2 f# X' W    // a default order of `Sequential', which means that the
! R+ R' m, [: R% m    // order of iteration through the `heatbugList' will be
9 x; M- w5 c% B, g    // identical (assuming the list order is not changed
4 y; X# h" M7 {. W0 \+ k    // indirectly by some other process).
. \# N$ `  R7 }! j' V; s: D    / u6 q0 e4 c, p$ l
    modelActions = new ActionGroupImpl (getZone ());
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    try {
: t7 R$ G* U) J0 y* t  G      modelActions.createActionTo$message1 r8 n; e* I" A' s3 M# k5 v
        (heat, new Selector (heat.getClass (), "stepRule", false));
. v% j* k3 K5 ]4 n7 \    } catch (Exception e) {
1 R. r0 B+ k* F      System.err.println ("Exception stepRule: " + e.getMessage ());6 @8 ?1 T: ~5 H* d8 c% J
    }4 `5 H) g0 N. B2 P1 S1 |2 K

( t, \' i- s% z    try {
* k7 y% o8 p" a2 f      Heatbug proto = (Heatbug) heatbugList.get (0);/ C8 E- t5 ?. z4 v/ c6 m& h; s* P7 e
      Selector sel = ) t$ M, k6 p1 v
        new Selector (proto.getClass (), "heatbugStep", false);5 v  j/ _9 y# I. F$ n1 y3 \7 V1 F
      actionForEach =
+ p- V$ S, e- \        modelActions.createFActionForEachHomogeneous$call
' Z( s* {2 w3 j3 s0 `$ _        (heatbugList,8 O; M# F+ ?. j4 ~
         new FCallImpl (this, proto, sel,4 l9 R' I* f0 Y; V* L# t; o- w
                        new FArgumentsImpl (this, sel)));
. T/ m  q$ Q  {  {* n7 y    } catch (Exception e) {6 v8 u2 r$ s* l$ h* A
      e.printStackTrace (System.err);
, d4 ~) P* z; K$ g  |' f  \    }7 R9 a& p* M% k7 y  O
    % \( s8 N; M: [# l" }
    syncUpdateOrder ();
3 }/ u* R+ w$ A, G
  Q. g- n  N7 x2 g    try {$ k2 ?1 I0 t$ H0 J9 H- O
      modelActions.createActionTo$message
  g; V/ J4 F. |+ F4 ?$ R/ ]        (heat, new Selector (heat.getClass (), "updateLattice", false));% d6 s/ J- @1 U  s
    } catch (Exception e) {
5 n2 b, l, k' @; e) K6 |( @      System.err.println("Exception updateLattice: " + e.getMessage ());
% e& B$ q5 {' p0 e) {! }    }
+ d3 R& i+ ?" M/ s/ Q        
% R4 G* c6 u) c% x  i. @    // Then we create a schedule that executes the- w( G& [2 R& N! f
    // modelActions. modelActions is an ActionGroup, by itself it
; A) h; f& v/ j# E) L  ]+ d! _: G    // has no notion of time. In order to have it executed in
  ]/ v3 p; J5 n    // time, we create a Schedule that says to use the
- p# T$ @8 m7 w% }2 d. X    // modelActions ActionGroup at particular times.  This
6 L8 u+ A8 ^, d' \, p& f/ G% K    // schedule has a repeat interval of 1, it will loop every
+ k( B/ A) [. T/ W; b, G" Y    // time step.  The action is executed at time 0 relative to
  }; q  J# w% B7 I    // the beginning of the loop.% n& w7 x  E) _
8 _: G! k) t6 O  M9 @! @4 `
    // This is a simple schedule, with only one action that is
' ]1 t+ r' E+ D4 h4 j4 |1 o: `2 s    // just repeated every time. See jmousetrap for more6 `3 Q/ x8 H: a$ ^
    // complicated schedules.
; W5 I2 E  u* d! @8 J: y! Q  . a/ G3 H$ Y9 U: K+ M, f
    modelSchedule = new ScheduleImpl (getZone (), 1);$ D/ }; }+ y3 q1 z2 Z
    modelSchedule.at$createAction (0, modelActions);' ~- j5 D: q. V8 Z$ _. a/ S" F& q% Y
        / i: i: M! B, W1 J# _
    return this;8 U' |. g( g+ u/ M: G# B7 y  z
  }
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