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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:5 i7 I; r' V3 b( o- E

( n) M- I/ Q' ]- \& f. Z public Object buildActions () {4 ^7 S4 m  K. c  f+ ?& U. e& W6 i+ u
    super.buildActions();
' @. c/ q5 i2 f# q3 ?! V   
4 U3 h+ S! R- V' O/ z    // Create the list of simulation actions. We put these in6 a1 t$ x- k5 H( e& A9 E
    // an action group, because we want these actions to be# v) S9 V0 F' w' z+ V7 e6 z
    // executed in a specific order, but these steps should, d, j- [; ~* g% U, I
    // take no (simulated) time. The M(foo) means "The message
) y* Y  q- A* E: \- D$ _    // called <foo>". You can send a message To a particular. e5 A5 c% |. W' ~  R) U
    // object, or ForEach object in a collection.  F  q5 K& R: G, x2 Y5 p1 U; E
        
4 L9 ~6 E& `$ g& T7 m) E/ R    // Note we update the heatspace in two phases: first run
- j* {9 R4 _# ~. X  @& a; [+ r    // diffusion, then run "updateWorld" to actually enact the
) X4 p  n% T; u) f3 q    // changes the heatbugs have made. The ordering here is/ K% I8 K6 S% Y
    // significant!( k( f, P. G: x( M
        
0 k" {2 b& s) x. Q9 k# E    // Note also, that with the additional
* F+ Z9 y7 ?2 Q% z7 B    // `randomizeHeatbugUpdateOrder' Boolean flag we can3 u0 L7 W# R. S9 M  B5 }
    // randomize the order in which the bugs actually run
7 D4 A" p" I+ ]" n7 T+ M  |& X- |    // their step rule.  This has the effect of removing any
, c. g. a2 y6 [2 r4 o    // systematic bias in the iteration throught the heatbug
  |& Z- G9 \" n" y9 c, N* ]    // list from timestep to timestep
9 C) n1 g. t) {& o/ r        
# ]. J  S8 K8 O    // By default, all `createActionForEach' modelActions have
7 Q+ }' s  H/ ]( {4 Y4 |    // a default order of `Sequential', which means that the" T" ^  i( V( e
    // order of iteration through the `heatbugList' will be
/ j/ {4 \6 m% t! Q6 l) }$ `    // identical (assuming the list order is not changed
9 R/ F7 F) S" p& }. o  [' l    // indirectly by some other process).
4 S! x9 Y% l$ F3 m& A' h( H    % {9 T% ]0 f6 i' l0 A4 u& o& \
    modelActions = new ActionGroupImpl (getZone ());5 M4 n6 m% @2 u8 |
1 K0 V8 V8 Z/ b3 ^" |6 N
    try {. ~, _- c- J7 p$ G; W0 \- b
      modelActions.createActionTo$message
7 A! t# I2 Z% h) {2 s# `/ ^        (heat, new Selector (heat.getClass (), "stepRule", false));+ Q5 x+ A/ I- U2 `& a' a
    } catch (Exception e) {- \" `1 {/ K/ ]& ?
      System.err.println ("Exception stepRule: " + e.getMessage ());
  j& A3 i( ^# Z    }  F- G0 N. S: Y$ \8 y

3 o# c# z7 o$ O7 w  C. e$ X    try {
6 e: H* L! L8 H( h$ Y7 \6 H" m6 a% H# g      Heatbug proto = (Heatbug) heatbugList.get (0);
6 K* K& R- C3 k( \( ~      Selector sel =
- K1 D, _+ H' s$ {  w! U: F+ k        new Selector (proto.getClass (), "heatbugStep", false);
! C+ [$ m. S5 s& A+ I2 z      actionForEach =
8 G0 ?) m* n0 N3 T  h; K        modelActions.createFActionForEachHomogeneous$call( I  M3 r5 ?% v6 A/ L4 U0 I, E
        (heatbugList,+ h9 v) j. X, H" f7 O0 d$ d  T
         new FCallImpl (this, proto, sel,! C+ b) X( F: Q
                        new FArgumentsImpl (this, sel)));0 x( m" n/ J/ J2 k5 X1 p1 ~
    } catch (Exception e) {
2 ?0 i$ v+ P+ Z+ B% @      e.printStackTrace (System.err);
! f2 A  e2 A" S  [    }# |+ d: F' j3 M; C1 {# D. g
   
9 ]% Z- {8 h( b. ]: ^  o$ f. o- N    syncUpdateOrder ();
- D9 c; e7 a# w2 u- o$ J
# a7 Z" o) X9 P5 L    try {7 x+ G# f: \8 v- Y' G9 B
      modelActions.createActionTo$message ) s* x$ r" Z2 ]  [$ [8 C
        (heat, new Selector (heat.getClass (), "updateLattice", false));
  X% l" _( i& B3 `* v' X" ]    } catch (Exception e) {
3 e; _- \. J9 U* L      System.err.println("Exception updateLattice: " + e.getMessage ());
0 s' T$ C( ?( a! x$ \    }8 ]2 B- p4 e+ s+ K
        6 {$ E9 X4 ]3 T; }
    // Then we create a schedule that executes the6 ~# w( o% E% r. g; {) g7 h& T
    // modelActions. modelActions is an ActionGroup, by itself it
% c1 u: v; X1 g8 S    // has no notion of time. In order to have it executed in
9 G( u' D1 g9 J    // time, we create a Schedule that says to use the0 h; g2 W9 Z2 t
    // modelActions ActionGroup at particular times.  This9 l1 N3 M7 x8 k# [
    // schedule has a repeat interval of 1, it will loop every
& s2 e' n4 `! ?) o5 E" m    // time step.  The action is executed at time 0 relative to, o, O6 s+ a; @# i  E( i2 E" U
    // the beginning of the loop.
' Z* V1 W0 d  M: z" [* J9 @4 j
5 _+ [9 d) L, ?6 H( \& T9 D$ |    // This is a simple schedule, with only one action that is
) q% \8 V5 V# D, k& w    // just repeated every time. See jmousetrap for more
; h9 E" J0 _8 @1 u( {$ O/ G    // complicated schedules.
3 l% p% x3 G2 o/ u* ]/ x  
/ J0 R. ]2 N! ~" Q    modelSchedule = new ScheduleImpl (getZone (), 1);+ ~; h5 c& G9 ?% q
    modelSchedule.at$createAction (0, modelActions);
$ T# ^7 g3 ^, e& b" f3 E5 K7 {        
$ p8 t+ Y( z3 R  \    return this;/ [  u7 m% e5 h# [
  }
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