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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:
" U: o8 V$ ~7 w2 s4 r
5 u  _9 x1 |& o3 m/ v public Object buildActions () {6 j1 i; }  r  ]/ w& l
    super.buildActions();
* n  l; I8 o' Z   
( Z" I) F, t2 I' T    // Create the list of simulation actions. We put these in( O2 p- X1 S5 ?
    // an action group, because we want these actions to be; S$ F. {3 T* Y/ D) e7 b" f; {! B8 m
    // executed in a specific order, but these steps should
% U( H9 @, g& \; b# C1 R3 q5 v7 F0 }    // take no (simulated) time. The M(foo) means "The message
4 i' i3 w; C/ k0 ]) J8 F# P6 G    // called <foo>". You can send a message To a particular* Q) Z+ k6 p5 \3 o
    // object, or ForEach object in a collection.* k& H& _0 \& h' K; l4 G9 E: R4 @' l
        
( q) J* L4 \+ `, u8 A  G2 k2 M. J    // Note we update the heatspace in two phases: first run  A2 }/ M# C! I5 C$ E4 ?
    // diffusion, then run "updateWorld" to actually enact the9 n2 p* [' R. \# u3 I( B
    // changes the heatbugs have made. The ordering here is
1 p; {( s: U: e5 E0 n    // significant!6 u/ \, h6 S+ }  C& s
          Z8 u" d- Q& ~- q- {1 C
    // Note also, that with the additional
1 y! A- X1 F' u8 q( w* K. c    // `randomizeHeatbugUpdateOrder' Boolean flag we can
! S# t8 w+ l9 s4 q  n, N* |    // randomize the order in which the bugs actually run8 A; h' y% C' \( l1 o7 `
    // their step rule.  This has the effect of removing any: q, P! ^$ F- f7 D4 H3 s2 s" @
    // systematic bias in the iteration throught the heatbug; r, ?' O0 q8 f5 o$ O
    // list from timestep to timestep: s! i) F. J5 f9 N, S$ ]$ R0 M/ k
        ( R+ ^+ k3 b/ {9 U6 g
    // By default, all `createActionForEach' modelActions have
( P) Z0 k2 A( t    // a default order of `Sequential', which means that the
3 ^) C# Q( n  M6 G7 m    // order of iteration through the `heatbugList' will be/ f7 K- Z1 \0 F, ^5 {7 v
    // identical (assuming the list order is not changed8 D$ x; r% A' t/ R5 p: ]" v) V
    // indirectly by some other process).; F  T! k2 X: F  O8 J
    5 u% f4 B% {0 M$ P9 T5 o- j0 I
    modelActions = new ActionGroupImpl (getZone ());# ~. t# y# g+ p

3 R0 J0 y' F3 T+ D) a    try {
6 @2 M& M* C" `  q6 h      modelActions.createActionTo$message: g" Z! Y7 I5 l5 \% }' D3 X" ]
        (heat, new Selector (heat.getClass (), "stepRule", false));9 I6 W: J! R& N, p: e
    } catch (Exception e) {  q8 s. P0 N3 Q
      System.err.println ("Exception stepRule: " + e.getMessage ());
8 ~( C" L# y- A0 H0 P: u    }
* z7 W# C7 B* v5 L, T) W/ k2 U8 B
0 H. O4 Y* p$ K! |+ a    try {9 X, C, r7 a2 c
      Heatbug proto = (Heatbug) heatbugList.get (0);
; @$ S+ `, J' k* K* _      Selector sel =
( ?! @! z7 d$ ^( ^7 X5 h$ C        new Selector (proto.getClass (), "heatbugStep", false);
' j) R. ~6 ^5 B% i! ^      actionForEach =
- R# q! F+ z' q. _* P6 }        modelActions.createFActionForEachHomogeneous$call4 j% ?1 d$ g: M- }0 u
        (heatbugList,- r- V5 T' o, H
         new FCallImpl (this, proto, sel,
- d' i' J7 ~$ J                        new FArgumentsImpl (this, sel)));
4 I/ ~7 \( z+ M    } catch (Exception e) {
3 l2 n- |$ f, M' c* K  W  e. X/ E! L      e.printStackTrace (System.err);: y0 s7 A, t" L5 z7 G
    }
0 o% x4 z. w0 b" r/ ]    ! |+ N9 j# Z, q- A
    syncUpdateOrder ();# A) ^, g& X( }1 y5 y

8 ]; u: e3 Y% S, F. ?" B    try {
6 W+ U2 r$ A2 j$ d0 @& x0 p      modelActions.createActionTo$message
4 A9 }2 W& N. e$ }5 y! q6 m        (heat, new Selector (heat.getClass (), "updateLattice", false));( p0 \5 `3 o* ~" y8 u
    } catch (Exception e) {( Q- [3 t0 _8 f0 ^9 }$ G  Z4 T8 v
      System.err.println("Exception updateLattice: " + e.getMessage ());
- H1 a) j- X: A8 v% W    }
, ?% w3 n2 n+ b4 a# g        + X2 J, G( d  v8 e* T6 r2 B
    // Then we create a schedule that executes the! \$ f% ~7 T" s7 K' K
    // modelActions. modelActions is an ActionGroup, by itself it7 M2 f7 A% d- y- m& u$ O& _) G+ v
    // has no notion of time. In order to have it executed in3 `  I8 ?8 W8 E9 K9 E% }4 m
    // time, we create a Schedule that says to use the: x0 |' T& Y- r% v! Y8 {& F
    // modelActions ActionGroup at particular times.  This
- V7 I% f. r1 c    // schedule has a repeat interval of 1, it will loop every
; d4 n$ J$ G/ m    // time step.  The action is executed at time 0 relative to
1 w9 J& x9 s7 Q    // the beginning of the loop.4 h  _( M4 p$ F$ C

' n1 a/ e. q# {6 F! u& K    // This is a simple schedule, with only one action that is
" ^" u3 y# _4 F; N- ^' x" t# S- d. B    // just repeated every time. See jmousetrap for more# z2 k! x+ J% {  w5 a) H' r6 E: m1 `
    // complicated schedules.
0 V& k. x  i+ H% V  ( E; A- M7 p' _' r
    modelSchedule = new ScheduleImpl (getZone (), 1);  j4 J4 l0 Z; ]" P* j
    modelSchedule.at$createAction (0, modelActions);0 L* @  [5 e0 \% i
        
4 K3 Y- i; V/ q( N    return this;( |* o: _( L5 V, w( d/ Z+ t5 f
  }
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