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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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3 W, ^6 g' H6 }. ^9 K1 s public Object buildActions () {
' d% q- K5 n7 D( @6 p    super.buildActions();6 U, P% @  s) C# T
    6 S. k9 l& u' M2 s7 H) P5 x! G, K
    // Create the list of simulation actions. We put these in
0 d% Z; p& H3 ~' c    // an action group, because we want these actions to be% }" m' r9 ^' q! W; c
    // executed in a specific order, but these steps should* J+ \8 w  |: f9 d
    // take no (simulated) time. The M(foo) means "The message& Q  j' Z8 @0 n9 f
    // called <foo>". You can send a message To a particular
% p% s$ _  d  o! |2 Q: a5 J/ P    // object, or ForEach object in a collection.
  g9 K/ f" @+ q4 Y6 V$ c        8 F* O  `. W, a4 Y! g, \6 b& a& W
    // Note we update the heatspace in two phases: first run
  I" I. M5 ^) g    // diffusion, then run "updateWorld" to actually enact the
; ?) P9 i2 x' I3 G* s. n3 a    // changes the heatbugs have made. The ordering here is' l& Y9 u7 {4 J, R
    // significant!
( ~3 \# q' {. O+ M7 Q4 d        3 h4 Q0 [1 S+ [$ k) |) R
    // Note also, that with the additional' H# O# {! Q$ y% b: a4 t5 O1 O9 @
    // `randomizeHeatbugUpdateOrder' Boolean flag we can0 H" T9 I) f! l; V' b
    // randomize the order in which the bugs actually run7 r8 P7 T5 A# N3 M5 |
    // their step rule.  This has the effect of removing any$ S" }* E& P1 e. S9 i
    // systematic bias in the iteration throught the heatbug7 C0 B- m6 q$ ], \. Y+ X$ \6 y$ }
    // list from timestep to timestep
. Z0 u3 n3 l3 g8 Q9 Y0 T: o  Z        7 q: V4 O5 ~! a' C7 N+ Z
    // By default, all `createActionForEach' modelActions have
8 z8 C2 y$ m; ^& j4 r8 ~# e" R    // a default order of `Sequential', which means that the' c. J; X+ G' m1 q
    // order of iteration through the `heatbugList' will be( ?9 d' H) g9 S6 t
    // identical (assuming the list order is not changed
, H( B  X: K! [7 }3 P, d! _    // indirectly by some other process).
" b+ p- ~  F/ N3 R   
  {# }7 V9 D1 P( }" j7 c6 j    modelActions = new ActionGroupImpl (getZone ());
' H3 q' r* j# {/ F' r  E! @+ d
( R/ L4 P( z* r1 |. u    try {" z6 N: _2 N7 w3 d' K4 q0 j
      modelActions.createActionTo$message
9 N3 {  o9 i9 V! p  @. Z5 Z  x        (heat, new Selector (heat.getClass (), "stepRule", false));
0 r  N& [  [( `0 k    } catch (Exception e) {
& M/ L! u) \9 |3 I1 n      System.err.println ("Exception stepRule: " + e.getMessage ());8 V* L, d/ D- W6 j% z3 l. ^
    }# _+ X# P2 b0 |+ D& v0 v! L7 }( M
+ V& W" }/ K0 c( D0 M
    try {# s+ I& t, m: ~0 M4 O& Q
      Heatbug proto = (Heatbug) heatbugList.get (0);; Z3 {  \& w: }' P  a0 _/ ^
      Selector sel = 4 K3 y* n6 w0 d! ^$ o! E5 }# {
        new Selector (proto.getClass (), "heatbugStep", false);
. k  s: r' \! P. M3 q5 S      actionForEach =
4 z$ u/ q, A& b( L% t  p6 @; `$ y        modelActions.createFActionForEachHomogeneous$call6 J1 K2 C2 S4 ~' W+ j  u
        (heatbugList,
. W: C, n+ U5 [         new FCallImpl (this, proto, sel,1 l' [, `! Z2 p( t6 o5 S4 b
                        new FArgumentsImpl (this, sel)));) r% p6 E8 g. v
    } catch (Exception e) {
/ ~) I# d5 Z: {' v      e.printStackTrace (System.err);) y- B1 @1 V" w
    }
' I- x4 Q  t. f* E' s: P8 e    : A# Y  s( ^# c- s+ B! b
    syncUpdateOrder ();# u5 q# q- q8 G  u
  R" D6 C! Y7 k4 Q1 C6 ^) I
    try {5 K1 ^, o9 ?& ^% f1 y5 O; ^7 {0 g, z
      modelActions.createActionTo$message
. F3 v6 v9 X9 G% C) j0 L3 {        (heat, new Selector (heat.getClass (), "updateLattice", false));
) n5 [" m+ b5 K    } catch (Exception e) {
( `- v# D! e: Z( ^! A# t  W      System.err.println("Exception updateLattice: " + e.getMessage ());, ]3 d3 T1 Y% `4 S! h5 s! f. v
    }, ^0 _# v# e3 f; B  o
        
& N* S" t0 [) }  z) y7 p: t    // Then we create a schedule that executes the
4 g% S. N, m3 H  X3 e    // modelActions. modelActions is an ActionGroup, by itself it- y7 N( {: o! \8 k! [4 E
    // has no notion of time. In order to have it executed in
6 D% y5 i9 f6 T; N% L( N    // time, we create a Schedule that says to use the
% D2 |. b* h  f: k    // modelActions ActionGroup at particular times.  This
- ?, O+ d! U0 O& V: \: u( p, Y/ Z    // schedule has a repeat interval of 1, it will loop every
% {  V! `9 p) ^2 P    // time step.  The action is executed at time 0 relative to% {6 A  `( E3 M3 T) F2 `
    // the beginning of the loop.
  q0 k  @* a" ]
8 f1 m5 G+ P5 l- @( `2 w3 L    // This is a simple schedule, with only one action that is
/ _# r0 B7 @) L# I    // just repeated every time. See jmousetrap for more
! J& t& r. W4 F% H2 X/ j! a    // complicated schedules.+ `9 H7 |5 Z$ l2 V7 F* a" S
  
$ I4 b, W1 \) j$ u3 Z    modelSchedule = new ScheduleImpl (getZone (), 1);
" Z0 [( T" H0 j" \% g. F. P0 l    modelSchedule.at$createAction (0, modelActions);
! ]- e1 z6 I; w* Y# N+ D        
+ j9 W) x, H3 S) X: `    return this;) }4 c7 ^; ^" P7 S6 p5 W
  }
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