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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:) D# I$ M- P: i+ @; `

- z& W! }3 C! \+ r' c1 \/ S public Object buildActions () {7 t% d6 Q0 ~- T. t
    super.buildActions();& H. |$ ]$ m& a: W; X; Q
    - \: z( M. K/ l6 {! T( t4 p/ s( W( p
    // Create the list of simulation actions. We put these in/ @& D; G6 a' ?$ O/ T( @# y
    // an action group, because we want these actions to be9 Z2 H: i/ m4 u7 G
    // executed in a specific order, but these steps should  Z$ D* M' n3 ~# P. f8 k
    // take no (simulated) time. The M(foo) means "The message# S. E& f) k  e+ H6 z
    // called <foo>". You can send a message To a particular1 d- X, B5 c6 k- _  \! @! n7 f
    // object, or ForEach object in a collection.
8 `0 }% E* d: J9 x2 @- r% W        5 O$ ?5 ?6 B: |
    // Note we update the heatspace in two phases: first run
, [0 }& F; U/ u" N5 n  e& }    // diffusion, then run "updateWorld" to actually enact the. E* F4 O/ o4 X8 y. J$ M- k, F
    // changes the heatbugs have made. The ordering here is2 v! r3 x8 L7 L2 a
    // significant!
- a0 G% G! t( ^        
+ u; A, R3 g, ?    // Note also, that with the additional
' S5 i$ C  V. a$ c, k; B    // `randomizeHeatbugUpdateOrder' Boolean flag we can
: u5 N: J: R3 x7 [+ f' @& F; a) V. W    // randomize the order in which the bugs actually run) C4 V' j( ?$ P% B5 S1 o
    // their step rule.  This has the effect of removing any
# N1 b9 Q* I+ X% x    // systematic bias in the iteration throught the heatbug
  f/ n6 _7 q- e' C- b    // list from timestep to timestep+ v0 o  d5 Y$ S& V6 T
        
/ H- R; _0 m/ t/ q( U    // By default, all `createActionForEach' modelActions have
1 [  N4 t' e" K! z* Q1 N    // a default order of `Sequential', which means that the: z  V1 v  }' v! k" I( r+ |" d( E
    // order of iteration through the `heatbugList' will be5 z& k7 \- ?  ~8 M. s" l8 s0 k
    // identical (assuming the list order is not changed
1 M1 y) i; I" C8 N3 N& A( `, |8 G    // indirectly by some other process).
% N) D0 p  o8 K5 a    5 r1 g/ z1 q, }8 n, s
    modelActions = new ActionGroupImpl (getZone ());
2 L5 s' ~8 Q- @' j, J: S0 Q+ ?; H: o& K
    try {8 q4 j' [1 Y$ @0 f! X7 Y6 q8 S0 s
      modelActions.createActionTo$message
" [2 F# ]! B$ A        (heat, new Selector (heat.getClass (), "stepRule", false));9 `' G2 R# e, Y
    } catch (Exception e) {
% ~; M. q6 i# u% Q      System.err.println ("Exception stepRule: " + e.getMessage ());
0 K: _" s+ [0 B5 f) }    }
( h& ~# d" W- e" a
5 f% e% k1 D% |. l0 E4 X" \    try {
+ M4 H. n4 m3 v; ~1 x      Heatbug proto = (Heatbug) heatbugList.get (0);+ Y+ ^! d7 b5 y  F# y6 l. M6 K
      Selector sel = ( p- X8 Z! _2 I( h6 w4 k( h
        new Selector (proto.getClass (), "heatbugStep", false);6 K5 b  x" Z! ]  _. \- U8 V
      actionForEach =; q3 H6 Q. t+ P4 b- G4 M7 ~
        modelActions.createFActionForEachHomogeneous$call$ N7 G8 e: d4 C6 q
        (heatbugList,
3 e* ?) ~. E4 i" m0 q* |) ~9 X         new FCallImpl (this, proto, sel,
% y# q5 Q$ `/ F3 a* C                        new FArgumentsImpl (this, sel)));
. ~8 r) j$ q9 N3 I9 ~$ G2 C    } catch (Exception e) {
$ [' G9 M* u2 Z' g' Z      e.printStackTrace (System.err);
7 e2 f8 m' i5 }, r    }% l8 I2 ^3 f. n2 B
   
! U4 t) {" w7 [9 r: s8 l: m+ c    syncUpdateOrder ();
: y. Q3 ?+ l' P! T' @) ?5 f! ~8 ]
    try {, l1 c& I. {- V+ p2 Y1 ]3 ^
      modelActions.createActionTo$message
0 k( ^  g" o0 g; ]0 b# a  V        (heat, new Selector (heat.getClass (), "updateLattice", false));. {: E, y9 d; a7 w3 P
    } catch (Exception e) {
5 @) v# V6 {  W" o0 }5 q      System.err.println("Exception updateLattice: " + e.getMessage ());
. M; K# R8 t# t5 t# F& n8 m8 p    }
9 h4 r4 y3 b+ S* }6 K        
9 t# T  r# {+ g( y7 g    // Then we create a schedule that executes the7 ?/ c% g6 x& S3 [2 Q6 k
    // modelActions. modelActions is an ActionGroup, by itself it
* B' `* G' [* u# W, S  |    // has no notion of time. In order to have it executed in$ T8 b( K8 c9 S( i
    // time, we create a Schedule that says to use the2 p" m( r9 o1 P0 D9 t$ J
    // modelActions ActionGroup at particular times.  This
, m0 `/ _- v- z. u) k0 ^: ^* H* C, G    // schedule has a repeat interval of 1, it will loop every1 _8 }" a1 j$ C, b& g$ C6 P0 j
    // time step.  The action is executed at time 0 relative to, X. D& I  K5 Q$ h! w9 l: W
    // the beginning of the loop.: L7 A) Q! s& H! f1 q1 O* e6 n/ {

4 m6 A' R0 V: n" R    // This is a simple schedule, with only one action that is2 m! E7 e2 B0 m% o8 J* J! U
    // just repeated every time. See jmousetrap for more
$ G9 ~7 g3 `6 o4 Z8 H( L    // complicated schedules.
; }1 T. U- s) _. D  . Z$ q8 \' ?. ]6 c, B7 R
    modelSchedule = new ScheduleImpl (getZone (), 1);
: ~( T/ D0 F/ g    modelSchedule.at$createAction (0, modelActions);" {7 G2 r8 m) A1 l+ X
        
6 U! c: R  f/ k) F2 t    return this;
  ^3 ?; m% r' y0 }: b3 u  }
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