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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:- ]# k2 t. N/ ~
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public Object buildActions () {8 K9 c5 k: `0 N( W$ i  q
    super.buildActions();
: y9 ^; n2 q! u% j# _- V4 g5 a    3 L3 N0 H& J/ u$ x
    // Create the list of simulation actions. We put these in
  r/ C# y6 S& _; ]) Y6 t9 i3 v+ o    // an action group, because we want these actions to be  f; v7 N/ F3 N1 X! t
    // executed in a specific order, but these steps should
. I) i, n8 C3 ^; S( n    // take no (simulated) time. The M(foo) means "The message6 H8 i3 m/ ]- L- k2 Y
    // called <foo>". You can send a message To a particular) x/ e" _7 W9 K/ A  y7 d
    // object, or ForEach object in a collection.
* u8 X! I; x7 v        
9 Q6 g" S3 ]% j' l( r- i    // Note we update the heatspace in two phases: first run- d& m' P- [2 g$ u
    // diffusion, then run "updateWorld" to actually enact the/ i: b; Q! ~' l7 }1 D
    // changes the heatbugs have made. The ordering here is5 u4 D% r& t4 c$ m  e6 @
    // significant!" K7 G$ h/ _1 S, w5 l9 n( q, S4 W! r
        
3 t; O' j* {- @, R7 V# }, I9 b& U    // Note also, that with the additional/ C* r) U, f5 S+ D
    // `randomizeHeatbugUpdateOrder' Boolean flag we can$ ]( F, T. O0 |. J: w
    // randomize the order in which the bugs actually run" j& q* b9 m) E4 {- u
    // their step rule.  This has the effect of removing any6 i# s' o5 M8 E) ~* L6 ]
    // systematic bias in the iteration throught the heatbug$ P7 n8 U% r: A4 E3 K- v
    // list from timestep to timestep3 a- b/ v$ P) e. x: X1 }
        
# q+ N  ~) D1 N' `8 \: D) L    // By default, all `createActionForEach' modelActions have9 Z# ~: G# S0 p+ U& N+ y; d! \
    // a default order of `Sequential', which means that the
* X' b; i! ?0 t8 h; L    // order of iteration through the `heatbugList' will be
) t: R0 n4 ^: X$ N/ Z    // identical (assuming the list order is not changed9 o' n6 H' l5 H8 H* R8 u
    // indirectly by some other process).* M# {% S; P& F/ J+ k, t! }* y
    ) ]" z1 O! a7 P- O
    modelActions = new ActionGroupImpl (getZone ());
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    try {
" a9 b+ V/ y+ ]: c      modelActions.createActionTo$message: g% z  P' D+ K$ ^; f. d
        (heat, new Selector (heat.getClass (), "stepRule", false));! j2 T: ?# t: p7 p7 c
    } catch (Exception e) {
$ ]( s2 T$ S% H3 A8 Z      System.err.println ("Exception stepRule: " + e.getMessage ());
* O; J8 R1 z! R8 m9 C    }
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    try {
! y, q* `& o: c* W      Heatbug proto = (Heatbug) heatbugList.get (0);
. `% i0 q7 k5 U: m9 @8 z+ `      Selector sel =
" n" j: x; R- y. f# s# F7 S        new Selector (proto.getClass (), "heatbugStep", false);
4 k5 `( ]+ ^  L. o$ S      actionForEach =( b( Y  r) ?: N  L
        modelActions.createFActionForEachHomogeneous$call
- i% m5 K+ E. I& M# {/ s3 x        (heatbugList,
" p. [: L+ B3 {; F+ x4 v- ^         new FCallImpl (this, proto, sel,0 K, W' S$ i3 c3 v( b( W% \/ x
                        new FArgumentsImpl (this, sel)));
- V4 z7 W! |. ]    } catch (Exception e) {
9 F' P6 v7 R( n      e.printStackTrace (System.err);! A  d7 O; K* V; d2 c; y% G( T
    }, |0 c6 e! C- ^( d. k+ I3 u
   
5 I' s- _6 Q- s2 b    syncUpdateOrder ();
% }3 c& B/ f% I$ J6 n
' r8 o; V1 k; ^+ c    try {
" v7 i# T" u% a& L# H6 b2 M, X      modelActions.createActionTo$message
- F6 T3 R& [7 ?( g# h$ F        (heat, new Selector (heat.getClass (), "updateLattice", false));. V( r4 `4 |! z
    } catch (Exception e) {
% @2 I0 P4 A' Z7 k$ b- C8 N      System.err.println("Exception updateLattice: " + e.getMessage ());
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        ) p- o' \" s6 B6 H
    // Then we create a schedule that executes the# R1 G+ o  u5 O- \% W
    // modelActions. modelActions is an ActionGroup, by itself it
5 }* Y* |5 R! F$ H    // has no notion of time. In order to have it executed in; s; D6 Z; ]7 u! Z, o+ B( a
    // time, we create a Schedule that says to use the% z& G9 g0 r" f1 a% P. C# n0 U. l
    // modelActions ActionGroup at particular times.  This2 d5 W2 x* E- G2 |  Z& c& O' ^
    // schedule has a repeat interval of 1, it will loop every
# v3 O- |$ |2 k- ?6 ^1 p2 e5 n    // time step.  The action is executed at time 0 relative to; \' e5 h6 H; v; S$ |! L
    // the beginning of the loop., A7 J3 A0 g% E  q: G3 s; k% E

& q) W0 d. Z$ m/ F    // This is a simple schedule, with only one action that is
" d; s" b5 w! X& e    // just repeated every time. See jmousetrap for more. l' \; j$ e0 P! P% e# @# c
    // complicated schedules.1 i% m+ D# N! O0 E, u
  ! y3 _4 J1 U! L
    modelSchedule = new ScheduleImpl (getZone (), 1);
! v. P- o9 k0 f5 t1 F/ x* ^3 c9 [8 p    modelSchedule.at$createAction (0, modelActions);
; E- V, }3 Z- C6 V        
& I$ T: @0 @# ?3 b    return this;- e1 C* K/ \! q+ {
  }
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