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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:
3 i5 p2 A, G( E# g& D! Q: f- R- o" I2 u; G/ U# f0 _7 R
public Object buildActions () {) f3 f7 H5 R. `2 [' @( j
    super.buildActions();. ]0 F3 f+ {; k* n
   
5 Y4 p" t. D3 p( @$ x; W; F    // Create the list of simulation actions. We put these in
# `) H& d2 k4 ?4 d' t. `    // an action group, because we want these actions to be
$ j9 k6 p! M# @    // executed in a specific order, but these steps should/ P$ U: b* |; n& Z, ~/ R; n1 z
    // take no (simulated) time. The M(foo) means "The message
" V; c1 H3 J7 R; W+ Z    // called <foo>". You can send a message To a particular
: t" e. d) ]/ c7 Y6 \# k' x" F    // object, or ForEach object in a collection.5 U& S) F( k, i# T$ X) t% T
        : \/ F% p# M; E! l. P
    // Note we update the heatspace in two phases: first run
; Q/ A3 F7 i. ~$ R6 q0 ?8 v% y" S    // diffusion, then run "updateWorld" to actually enact the- E; W2 b# d  e# m  l3 a9 Y
    // changes the heatbugs have made. The ordering here is
% |0 H! g# C$ e( c: x4 T    // significant!5 ?" V. f3 u- X6 s% V/ b1 T! k
        
2 V0 W. x, |) {# l    // Note also, that with the additional
9 s; F, j3 V! `$ e2 h% e    // `randomizeHeatbugUpdateOrder' Boolean flag we can
9 _) v! A  n; Z0 J+ B    // randomize the order in which the bugs actually run& j  j1 q) Z4 k: [
    // their step rule.  This has the effect of removing any
8 k$ ~% k9 v. k0 F; W& I! U    // systematic bias in the iteration throught the heatbug& y; l* N0 M3 O+ h8 Y
    // list from timestep to timestep
' t$ u: ^: S& a0 M+ N  U        * V8 b  D5 n/ `8 C- r- Q$ @! p; C
    // By default, all `createActionForEach' modelActions have# d! y4 Q: ]* {9 h6 a+ R
    // a default order of `Sequential', which means that the
! M8 S9 g  D# s/ }    // order of iteration through the `heatbugList' will be
- _) _  ~3 x4 q1 o0 L# q+ B. Q$ I    // identical (assuming the list order is not changed
* K* v1 Y: Y2 `! M    // indirectly by some other process).
7 d( [/ F/ K8 |7 a+ e4 v   
# u# U9 B' Q" `* O/ }    modelActions = new ActionGroupImpl (getZone ());( z6 A0 C: M( v* x: D9 f) e- K. q
# `$ F, w& r- i3 s7 {2 ~0 @
    try {! L; Z+ K% }$ J
      modelActions.createActionTo$message
) q. D- h& s- u$ Y        (heat, new Selector (heat.getClass (), "stepRule", false));
; y6 P( e' G5 s) b    } catch (Exception e) {& o% i6 q6 X; g
      System.err.println ("Exception stepRule: " + e.getMessage ());
' ?8 W$ v# o* s/ q; U- F3 M    }
  f) b2 @+ H" N! q7 P  N9 u& W/ N5 h/ m
    try {  B% K  |: n% x; c- ]: \4 X
      Heatbug proto = (Heatbug) heatbugList.get (0);
: k+ u' D1 B& E: }' y- m% @/ Z      Selector sel =
6 G+ Y  V- {# z9 j9 ]        new Selector (proto.getClass (), "heatbugStep", false);
3 K, m% ^6 ?8 g9 G  P, a5 r/ E      actionForEach =
! U3 o5 j  ?) r9 O        modelActions.createFActionForEachHomogeneous$call
* E0 e$ m8 T3 R; W) a# {        (heatbugList,
& e2 {5 q6 S+ V- B5 o; v! R- T% @         new FCallImpl (this, proto, sel,. [. t; h, R, L1 n0 B1 E
                        new FArgumentsImpl (this, sel)));; p( R9 Q- ~9 F4 h! R- m$ X
    } catch (Exception e) {
# P1 \; Z6 J2 \- P1 B      e.printStackTrace (System.err);
" K! a8 F- q9 Z% t- V" Y    }
% |/ p3 o6 y+ w% ?6 b+ ~) q   
$ t4 O3 X4 C1 w9 f% H/ m    syncUpdateOrder ();- s: Y( T& z! O7 a
( b7 O: l2 a  }/ ?4 [6 T
    try {1 }! N$ B: B4 X# C2 e
      modelActions.createActionTo$message 7 E( t, B: g2 l& i: @+ a  h
        (heat, new Selector (heat.getClass (), "updateLattice", false));
% p6 z2 g9 J) V& G    } catch (Exception e) {
( y; Q9 E; \$ h! N      System.err.println("Exception updateLattice: " + e.getMessage ());
7 t; g3 p+ E+ _0 U! y0 s    }
, z$ U/ f; t! _/ l/ C5 v5 l; ~' z0 A8 H        
/ g$ a( N1 h6 g    // Then we create a schedule that executes the+ N( n; T. r3 b# \/ f+ ^& ^& B. Q. T
    // modelActions. modelActions is an ActionGroup, by itself it
3 G" s, D- n% J; c  L% d    // has no notion of time. In order to have it executed in8 `$ s5 P& o! |( p7 X
    // time, we create a Schedule that says to use the5 q1 E. g; ?* h6 H2 A+ Z. [. D
    // modelActions ActionGroup at particular times.  This
" Z/ e+ R& x* `* U    // schedule has a repeat interval of 1, it will loop every
- _  F# i! V' i) W$ T3 B3 D    // time step.  The action is executed at time 0 relative to
/ Y9 |: a3 U2 M/ w6 F    // the beginning of the loop.
) J: M; t! i7 V2 b9 N/ w" s. Q
7 F0 R/ ^! c" v# y: V; t+ F, F    // This is a simple schedule, with only one action that is# ?( v0 U4 W' r3 J* Q% l
    // just repeated every time. See jmousetrap for more
# `/ m9 Z+ U5 Y  d    // complicated schedules.
* {# g/ u$ n" _, z4 }# [5 q# k  ! n6 s" {0 M9 d8 f$ F
    modelSchedule = new ScheduleImpl (getZone (), 1);" r6 h" K% Z6 {) L/ s/ D' r( M
    modelSchedule.at$createAction (0, modelActions);- T* A  d$ i9 w9 R: V9 M1 O
        9 M7 V' n; a! Q
    return this;. Z; d( T5 q6 |# t
  }
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