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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 () {% ^' F- O& f7 t
    super.buildActions();
% s7 o' y4 `5 i8 W/ p  }1 g% b( N      x" f0 C3 {# I% u% j5 {/ l
    // Create the list of simulation actions. We put these in
- `( ^8 b& m# R( y6 A    // an action group, because we want these actions to be) e8 z2 }( F! E8 t( b$ s. A
    // executed in a specific order, but these steps should
+ {- g- X3 x# R+ h; h    // take no (simulated) time. The M(foo) means "The message9 v! N, G: l4 u9 l) j- n' H$ r
    // called <foo>". You can send a message To a particular: w7 Y* F, M+ U" ^
    // object, or ForEach object in a collection.! z# ^: m7 x' q+ W" G7 ]: x+ n
        % ^& `+ v3 @0 h# E
    // Note we update the heatspace in two phases: first run5 G8 M% `$ J& b; H5 C
    // diffusion, then run "updateWorld" to actually enact the' N% q6 @6 l5 y  w! s
    // changes the heatbugs have made. The ordering here is
1 r7 i1 t  }6 S% s1 b5 J    // significant!" ?( [7 c$ ]( G
        
* U) V& w1 L7 W7 n6 D( I7 G    // Note also, that with the additional
, N. i2 t$ U+ R) }" ]    // `randomizeHeatbugUpdateOrder' Boolean flag we can% V  w( G4 n. C! X, y5 B
    // randomize the order in which the bugs actually run% `( r# V; X  n1 A; x8 W
    // their step rule.  This has the effect of removing any6 `: V  N9 \# k' U
    // systematic bias in the iteration throught the heatbug
& p/ i4 a% h% x# h5 b2 x8 k0 ^    // list from timestep to timestep$ R/ q4 D+ U8 D
        
/ J$ }3 a9 n# B2 C* K+ Y( \    // By default, all `createActionForEach' modelActions have
$ ]2 X) O  e3 ?* w    // a default order of `Sequential', which means that the
4 J5 n2 X) m. {1 G    // order of iteration through the `heatbugList' will be( K/ G. V6 ?( e. u) Y  i4 B( N8 M
    // identical (assuming the list order is not changed' A/ Y- l" P' w+ D
    // indirectly by some other process).
) s0 P/ w1 {( r/ k3 W1 Z6 W& v   
9 @$ H) q. v) m% ^/ j8 w6 @    modelActions = new ActionGroupImpl (getZone ());
$ D& L' q! i* Y! E8 C( e; d
' y8 g$ w2 X( |9 Z    try {$ f; K9 N5 w- f. W2 d; H+ U4 w
      modelActions.createActionTo$message, P8 t: S9 Z9 O# `% k  b  _- L
        (heat, new Selector (heat.getClass (), "stepRule", false));% z3 Y# W- U2 q
    } catch (Exception e) {% `  S4 B/ L9 l2 l. X
      System.err.println ("Exception stepRule: " + e.getMessage ());
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; ^! k9 h/ A; h
    try {, K7 s& [# w) |0 \6 V- A# R; ^
      Heatbug proto = (Heatbug) heatbugList.get (0);, [8 B! z) c( g; |  ^
      Selector sel = % E: x1 q# b( T& e0 g
        new Selector (proto.getClass (), "heatbugStep", false);% [) P: Y2 o! i2 T  H. b
      actionForEach =
0 H  x  K' m- ?, _% K5 w6 c        modelActions.createFActionForEachHomogeneous$call  M% L* X% Q: d# L5 ?0 a/ f
        (heatbugList,
9 E& _9 a4 V7 j% n         new FCallImpl (this, proto, sel,
# ]/ ?6 t5 X* a6 _* p- R# S                        new FArgumentsImpl (this, sel)));
+ u& }3 D- }' D+ t5 R5 q( E% W    } catch (Exception e) {
" V; L1 I: `) r" b9 W$ y/ X      e.printStackTrace (System.err);  [6 ?( P! ^& M1 k
    }
1 v7 `4 o$ G! m; N: M. s   
! y- N% B& P- k# x# M    syncUpdateOrder ();0 r; y/ G; E- V  c3 Z

  t, Q) d- ^. t8 q# x, s2 o7 x    try {
3 d# Y! e3 I* C! `1 y% m# k. A      modelActions.createActionTo$message
7 j* c1 G9 K* C( ~        (heat, new Selector (heat.getClass (), "updateLattice", false));( ]! m* G4 e- D3 T  G/ y
    } catch (Exception e) {) r* D; s" q5 y& c0 q: P% l. D0 ~
      System.err.println("Exception updateLattice: " + e.getMessage ());0 E) X, S( G% g, G& P
    }
. Y4 F5 L7 N: s( T% F( Q" K        
7 l4 m8 c  ]+ v1 z% x    // Then we create a schedule that executes the
$ S  Z7 f6 ?* b% w    // modelActions. modelActions is an ActionGroup, by itself it
6 R+ H# J4 u4 E0 b    // has no notion of time. In order to have it executed in8 ~+ _% e1 \7 o. @& K; P
    // time, we create a Schedule that says to use the
9 R  o! A! P# x  Q    // modelActions ActionGroup at particular times.  This8 O6 Y2 r3 t) V
    // schedule has a repeat interval of 1, it will loop every
9 V9 g7 n( [/ {$ [6 Q) `8 r; b( G    // time step.  The action is executed at time 0 relative to
/ h8 R: B, u2 D- G  i( j+ {    // the beginning of the loop.
1 [$ \" v- P$ i# U. g3 R: k; T. u% |. |
    // This is a simple schedule, with only one action that is
5 P9 X& u% Z/ p, x    // just repeated every time. See jmousetrap for more
5 G( `6 p1 ^+ O0 b: s- _    // complicated schedules.
& G& H( }7 a/ p  
6 l3 F5 _8 v3 h, J  A1 I    modelSchedule = new ScheduleImpl (getZone (), 1);8 E) K+ h2 M4 d; n7 G  }2 K
    modelSchedule.at$createAction (0, modelActions);2 F4 A* e0 \2 q* o0 ]# X6 E
        
% i2 |* N, z4 D4 i1 w" W1 r* y7 Q    return this;; J1 P) i- j0 O- ?4 U& r' I
  }
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