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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:7 h; B9 k7 v, b: w
' ^3 w5 q' h- v! h- f
public Object buildActions () {' Q( B: ^; X; |( O4 I' i( n
    super.buildActions();
8 T$ Z! M: b- Y2 t' q& x1 B   
; `9 h- u5 f, d& H' N    // Create the list of simulation actions. We put these in4 d+ R9 R1 P4 Y5 y, w0 M
    // an action group, because we want these actions to be' |( `6 {8 {; o6 e7 n" x$ w
    // executed in a specific order, but these steps should
, W& v% b4 ~& b; w: G7 T4 J    // take no (simulated) time. The M(foo) means "The message
3 ?& d' @5 S1 x    // called <foo>". You can send a message To a particular
) s: t4 b8 \; k( j# K7 g7 w    // object, or ForEach object in a collection.6 N- B4 e; J' k+ R& p) o* u
        
4 z& k) L) z7 A7 h$ ^0 ^+ F/ y    // Note we update the heatspace in two phases: first run% O( B9 c4 B% K6 f% g- W
    // diffusion, then run "updateWorld" to actually enact the
6 [+ v. T; x0 _6 U, q    // changes the heatbugs have made. The ordering here is+ a3 o* l8 }0 b. k( ^/ Y
    // significant!
4 s/ u+ M7 x1 Q- g' l; t% ~        
4 t3 n2 I" J$ _( W4 t+ @. G/ F- q    // Note also, that with the additional" B+ P$ g7 S  a
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
: Y) P. x! ~9 S9 h. ?    // randomize the order in which the bugs actually run
6 Z, B5 d' T- B8 O& B/ B+ i    // their step rule.  This has the effect of removing any
  K. ^: h1 _4 t2 G    // systematic bias in the iteration throught the heatbug
5 d# m" c3 X. c/ d    // list from timestep to timestep8 J, S% J# R& S+ o5 v
        
5 O7 S0 P1 q/ `/ h) w# M    // By default, all `createActionForEach' modelActions have/ N! R" m4 D  i: |, X( t. N$ s2 {
    // a default order of `Sequential', which means that the
2 A3 y1 _: _# v% B& K    // order of iteration through the `heatbugList' will be. j$ o8 [) l% K) x
    // identical (assuming the list order is not changed& P* N- y$ f& u8 V: }; t8 O- F% E) f
    // indirectly by some other process).
. C$ B" W0 Y- j6 \   
% e, g& W7 D  _% Y" R: w2 @& z! k    modelActions = new ActionGroupImpl (getZone ());; n; t/ K6 P- i1 {( L

7 n4 v3 @9 j5 [5 N5 C    try {
$ z$ C3 M5 R9 r2 v      modelActions.createActionTo$message! ^  }& W& L! \
        (heat, new Selector (heat.getClass (), "stepRule", false));
0 `3 ^2 n# g$ M; y* r6 G    } catch (Exception e) {2 b6 U: X, _2 H  i2 B
      System.err.println ("Exception stepRule: " + e.getMessage ());
- N# Q! n% ~" W" S8 N; N: E    }4 F9 J( O5 }+ P5 ^% L0 d- i: T8 R, q

" R; o$ Y  M; a) {1 g% U2 Z$ V' s    try {
3 _& a' ~# q& U# u$ q: ^) t      Heatbug proto = (Heatbug) heatbugList.get (0);
/ E6 E& j* k& I: t  \6 e) _+ X4 q      Selector sel =
, {. }$ C4 Y& q7 B        new Selector (proto.getClass (), "heatbugStep", false);0 @4 E/ y$ e9 h4 L% Z
      actionForEach =
5 n1 L6 o- {0 r/ o8 W" r/ n; `        modelActions.createFActionForEachHomogeneous$call
( q9 X' t1 ^0 z5 j6 d5 J+ k9 B        (heatbugList,
) O9 ^( @  L+ W* ]1 ^5 n& H         new FCallImpl (this, proto, sel,/ P( ^" i2 o- i5 k) Q0 g3 J
                        new FArgumentsImpl (this, sel)));# M  N% b9 C) O( R# Z+ y
    } catch (Exception e) {
' R& Q  d$ F8 |  G7 e( j      e.printStackTrace (System.err);
* C+ C! ~! G; e7 g    }
) H  R( `; q5 z. s    3 }" r8 R; d. d7 M
    syncUpdateOrder ();8 n, I1 n) O- z2 Q/ ]2 `; p2 k

6 J" |, d1 X+ X. B/ J    try {6 O; X, l9 M3 u7 N6 P2 k; j
      modelActions.createActionTo$message ) s  N# ?* g! h( z" f0 x
        (heat, new Selector (heat.getClass (), "updateLattice", false));
' J% ?% k8 m6 G) q    } catch (Exception e) {+ R7 D' r% d$ }; p+ X
      System.err.println("Exception updateLattice: " + e.getMessage ());
( \) K0 l* E3 E6 z- G+ h    }
, O" p4 k2 T9 M) a& S+ ]  f% i        
! \3 n% ?" \. i' q$ W# ~    // Then we create a schedule that executes the
6 `+ p+ H' `6 W( s. n6 I    // modelActions. modelActions is an ActionGroup, by itself it
4 I" j3 w  v/ M  G, G, ?  B( F    // has no notion of time. In order to have it executed in
, V: H8 D8 J6 y# |) B- O, U* r/ r! d    // time, we create a Schedule that says to use the; c6 g. x' W+ x, g8 v
    // modelActions ActionGroup at particular times.  This3 d% c2 k( q, m, ^
    // schedule has a repeat interval of 1, it will loop every, o3 P1 N' C, I! K
    // time step.  The action is executed at time 0 relative to
9 q. m1 {9 K! Z% _" J% E9 j    // the beginning of the loop.  Q, X' h2 O4 |$ y, I  M. e. @
; ~3 U9 m4 k2 G
    // This is a simple schedule, with only one action that is
- P0 l6 C5 d7 z0 ?% t  u( r: W9 y    // just repeated every time. See jmousetrap for more% @5 ?' V1 @5 s6 [2 h
    // complicated schedules.
' c1 q. U% v9 B6 t: b& }  
: [/ b9 F  q$ K  z0 @: a7 J    modelSchedule = new ScheduleImpl (getZone (), 1);8 O+ Q* F1 ?* E- s; J
    modelSchedule.at$createAction (0, modelActions);8 ~& y( f  N) a6 R* N8 ~
        4 R. H! e9 o+ J. j4 c
    return this;
8 {4 b. C' |6 |* u  }
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