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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:
! w: f% v' C1 r4 o. i& p2 D& o, A6 y- z. }+ Q: {2 [; I
public Object buildActions () {
. t* n5 ~. d( w; o% X6 t    super.buildActions();
: f+ |$ {1 Z0 k" r# W   
$ G" t) q2 s3 }) V( i& f& h    // Create the list of simulation actions. We put these in4 `3 {1 o2 @* }$ F, }
    // an action group, because we want these actions to be" T6 ]2 y; t5 ~
    // executed in a specific order, but these steps should
" A( x7 U3 Y& x( g4 c( f2 A    // take no (simulated) time. The M(foo) means "The message
  ]+ A4 u7 {3 X& V    // called <foo>". You can send a message To a particular
% t8 X, J. C+ C4 d  K) j3 u2 d    // object, or ForEach object in a collection.- O* K( P* }, w0 [2 J8 L1 p! v
        ' c, T: m0 O7 g+ O
    // Note we update the heatspace in two phases: first run
9 @$ F$ u4 q  I  P8 R: S5 [    // diffusion, then run "updateWorld" to actually enact the7 q7 a/ i, V$ O1 w, J
    // changes the heatbugs have made. The ordering here is( p: K9 T: {* ]# _
    // significant!
0 X' p1 h, c- j7 Q: k' g3 x        
5 T$ o! p# \5 M- l3 j% @    // Note also, that with the additional
! F5 }9 K# Z& Q+ N( y, f% K    // `randomizeHeatbugUpdateOrder' Boolean flag we can) s& [0 l% U  A$ j
    // randomize the order in which the bugs actually run
9 l  u4 O$ m" j. W- `! T' K( u    // their step rule.  This has the effect of removing any
, C* ]$ q) f% z! d0 N5 k    // systematic bias in the iteration throught the heatbug
. w5 @& \8 Q9 @. g8 F; @3 U    // list from timestep to timestep( L/ v: G; C1 b5 ~. m% J
          M6 ]: i+ {6 W: J8 c" ^  H
    // By default, all `createActionForEach' modelActions have
4 K8 d$ i' v% L    // a default order of `Sequential', which means that the8 w8 K8 T# s, K$ l+ k' w! W
    // order of iteration through the `heatbugList' will be
  H: J8 o$ ?# Q: |% T1 G0 `    // identical (assuming the list order is not changed+ c- q4 P4 s+ Y& @
    // indirectly by some other process).4 w! v' d: _) O$ N
    : X$ j* ?2 r2 g7 J% h0 A
    modelActions = new ActionGroupImpl (getZone ());
3 U" I4 f, a: o- @+ Z# A1 }: Z8 M
    try {
4 [  f4 _1 c( c2 x8 j# [      modelActions.createActionTo$message. v( v5 k) n6 i4 M1 p4 y, \: N7 N
        (heat, new Selector (heat.getClass (), "stepRule", false));* p3 W0 q. D# }- W- ]# x3 K
    } catch (Exception e) {, Z. S% z0 W/ f8 _1 m) b# q
      System.err.println ("Exception stepRule: " + e.getMessage ());
( e( t6 n9 B- n1 H( h0 O6 i( z0 b    }4 V' }4 _: I5 @
/ r3 P) X$ y$ g$ E. F# Y9 A$ B1 l
    try {
" h" z1 b& s0 n( U& R      Heatbug proto = (Heatbug) heatbugList.get (0);9 M# q- f/ Y6 I& S* n) F
      Selector sel =
( {! K4 v3 `: i) o5 X        new Selector (proto.getClass (), "heatbugStep", false);8 `/ D7 j% S% @' H2 c9 z4 m: E
      actionForEach =
6 `5 u+ h) A4 G; m( a9 D, s9 |        modelActions.createFActionForEachHomogeneous$call
  C3 \4 r) x+ R' U8 Y; f( I        (heatbugList,/ C$ a: K' E( F& F5 ?2 ^  \3 O
         new FCallImpl (this, proto, sel,
- X1 l! N7 h! ~5 C8 M                        new FArgumentsImpl (this, sel)));+ `- q+ W$ Z1 }2 q( e6 I0 n3 o$ L
    } catch (Exception e) {
: O' u5 R' _3 l, L! w$ R4 r  A; O      e.printStackTrace (System.err);
8 `6 F5 F" l6 u/ Q0 d: m/ l    }
% n9 j2 @: O9 j- |    7 P5 h% N) A4 g9 ~' v4 C9 B" t0 s
    syncUpdateOrder ();  o' y$ F+ G& ~
4 l+ V/ \- J/ }5 o, ?: [8 T
    try {
7 e3 a5 N$ g! ]0 b( V+ J% M2 v( }      modelActions.createActionTo$message 5 H+ V, k4 W+ }' c$ U
        (heat, new Selector (heat.getClass (), "updateLattice", false));
+ v' F; X& ?) n; ]# }    } catch (Exception e) {! J4 Q1 x/ h2 B& w+ h4 l
      System.err.println("Exception updateLattice: " + e.getMessage ());
% [3 f1 T7 j" ]& ?    }
8 c. [: z* U0 q        7 \! l# j- O3 w7 E" I) y
    // Then we create a schedule that executes the
: m4 a" l+ @3 D# M7 f6 H8 c    // modelActions. modelActions is an ActionGroup, by itself it
! \  ?0 J8 L5 {9 |    // has no notion of time. In order to have it executed in
9 `/ |5 b& ?# z5 S6 L) W' I    // time, we create a Schedule that says to use the2 N% J! g! x/ \2 X
    // modelActions ActionGroup at particular times.  This
. C: g; x3 l  i, t    // schedule has a repeat interval of 1, it will loop every( ^  Z$ V" x! a. C
    // time step.  The action is executed at time 0 relative to# e( X' R; h- j# L4 {: B
    // the beginning of the loop.
, f# {) @" L) H5 F0 b3 L$ e1 e$ Z- o- s! n  w) I7 V* A9 t
    // This is a simple schedule, with only one action that is
# H0 a3 Z! }) }) ^+ ~9 T4 S+ d    // just repeated every time. See jmousetrap for more4 r4 x2 s+ i6 S. Q
    // complicated schedules.3 J& O* E1 s9 o9 E3 l! d+ U% |; t
  5 ~' x4 Z5 }% H. g, o6 q
    modelSchedule = new ScheduleImpl (getZone (), 1);, M) E3 x( e& I6 P9 D1 Q
    modelSchedule.at$createAction (0, modelActions);
( k. W9 v. j* I* e3 M, ?        ; d& }* z4 \# w- Q6 r; E
    return this;" e% L" `$ k" n- V3 `* e
  }
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