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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 r8 V: @8 `6 k: ]1 |! |$ e5 N6 K2 |

, c8 I3 B8 o  q( n0 M8 `! ^ public Object buildActions () {
, Y) _  r" w9 L* ^- V% v4 s    super.buildActions();
; a& J' z2 a- w2 a! k   
7 @) Y; ?( r3 U) _% R    // Create the list of simulation actions. We put these in! J6 d  r/ ]4 H/ F0 K/ m' K
    // an action group, because we want these actions to be
. p- F. x+ }# ^" X7 v4 J5 f7 Z    // executed in a specific order, but these steps should, e: u& Z# l* ?: w# K9 @0 }( _% ~
    // take no (simulated) time. The M(foo) means "The message) f! J- X( X2 y+ ^1 t2 x
    // called <foo>". You can send a message To a particular! x" }) g( ]/ Y, e! q- M, [7 C& i
    // object, or ForEach object in a collection.' ]; c7 C1 u! h. F  j7 X
        
: v# R; Z9 h* D    // Note we update the heatspace in two phases: first run7 u" S; H! b+ C5 ?2 e0 x+ [% Z
    // diffusion, then run "updateWorld" to actually enact the
- q% F, g# p1 h( U    // changes the heatbugs have made. The ordering here is
7 y- r4 W1 [+ Q3 w3 U: F    // significant!% @4 A. P1 ~4 M& C+ O7 f4 o
        ) z4 C1 j# F5 t9 R' v% k( y, K
    // Note also, that with the additional
, ?, R3 d" s- o0 w% {+ r7 ~: m    // `randomizeHeatbugUpdateOrder' Boolean flag we can; t: [1 l4 p4 J8 t* n
    // randomize the order in which the bugs actually run8 c  O  o3 D! k/ b8 _
    // their step rule.  This has the effect of removing any) C7 |0 I. o2 l+ x. a: N' l6 ~
    // systematic bias in the iteration throught the heatbug
( O5 Y' r' S2 C  W2 F    // list from timestep to timestep
  C5 X( `/ Z: [( d) y        / j5 O6 o2 u  X8 a6 c) Y% S
    // By default, all `createActionForEach' modelActions have
/ j# p) l9 o4 a! C  J  @$ c    // a default order of `Sequential', which means that the) {1 E3 \& J8 Y% C, W' |
    // order of iteration through the `heatbugList' will be
% w/ F& [8 C1 D( u) s$ U( ~' g    // identical (assuming the list order is not changed% X8 u, T. p8 z( C2 E9 x: ?
    // indirectly by some other process).$ |0 \, i4 e3 t2 I2 t: h
   
4 K) J; J. V9 ]1 S. [    modelActions = new ActionGroupImpl (getZone ());
; }4 `: |" J( ?0 U# c1 ~" u, l& B* s5 a. X" A6 u4 ~& d
    try {0 u& d2 F6 v& k2 u
      modelActions.createActionTo$message
8 R: B3 Z1 U1 p9 [        (heat, new Selector (heat.getClass (), "stepRule", false));
' Q) I  @8 |3 ~8 _* B    } catch (Exception e) {
& Y" [* D( S0 {) M8 ^+ z/ I2 f1 U      System.err.println ("Exception stepRule: " + e.getMessage ());
# l6 j+ y6 O( p    }
) |5 M7 v! B8 O% \+ ~0 B$ b. g
* ~; Q5 K  o9 d    try {" a% R! ~" D1 F& \$ @
      Heatbug proto = (Heatbug) heatbugList.get (0);
3 g: q' {0 n, S# i: s- b% ]      Selector sel = ( |2 b+ i4 M& T& n
        new Selector (proto.getClass (), "heatbugStep", false);
: ]& {, [1 V/ Q3 O7 h7 X9 Z, d      actionForEach =# ^- F6 M9 [% }
        modelActions.createFActionForEachHomogeneous$call
; b6 L* N4 \& |" u. T        (heatbugList,% G- D+ q! k* P( b* U
         new FCallImpl (this, proto, sel,( r! D7 T$ c( x2 j" j; J* c
                        new FArgumentsImpl (this, sel)));5 `1 e+ |! A' K8 t
    } catch (Exception e) {& x( O  z8 Z0 C! Z
      e.printStackTrace (System.err);
& S; o5 L  H3 {1 C% r. V% K. N    }* I- _5 N3 b- v- U3 t' L& V
    6 H+ }3 ^9 m+ ]. w( g; ]
    syncUpdateOrder ();# u* v/ ], C  n9 Q9 R0 r7 K) {

4 l8 t( _* H+ F5 ^; b    try {
" m$ J4 c( v, r      modelActions.createActionTo$message
0 c) C2 A/ b. p& V. e        (heat, new Selector (heat.getClass (), "updateLattice", false));
; I2 J% Z3 f! R2 j% p& |    } catch (Exception e) {$ l: H1 N# u( ]
      System.err.println("Exception updateLattice: " + e.getMessage ());& f$ [  u; h+ M
    }
; H* |3 e. D# X, w- i( F( r        
+ J. W' w! f$ G/ R, n. ?# e    // Then we create a schedule that executes the( k" @5 M3 K( D2 q$ N9 M6 C# C
    // modelActions. modelActions is an ActionGroup, by itself it
  |* V% F+ |( Z* W( R    // has no notion of time. In order to have it executed in
8 y* C4 I! g8 K  R7 O3 u$ I    // time, we create a Schedule that says to use the% ?, K" G7 @9 j+ }# M9 Y6 D
    // modelActions ActionGroup at particular times.  This/ d! _* j' l" G4 S- G( O5 b/ f
    // schedule has a repeat interval of 1, it will loop every
0 p% Q: `& t* C! @9 R& ?' }: D    // time step.  The action is executed at time 0 relative to
3 N2 J' s( C6 {6 l    // the beginning of the loop.
8 q6 H+ x% s/ _7 h) L2 N1 k  w& ^' i
    // This is a simple schedule, with only one action that is+ a9 }* g: s7 r0 F7 ]% l; a$ c
    // just repeated every time. See jmousetrap for more) A+ u- H6 X% j
    // complicated schedules.
$ e  @+ [) `: X" V: Y, A  
. e, y  e' k% _& @! X    modelSchedule = new ScheduleImpl (getZone (), 1);
( k1 r7 t" ^: |, w4 q2 M    modelSchedule.at$createAction (0, modelActions);3 l$ Q# Z0 q8 i7 J# P, X
        
4 n( G/ d0 K" Z    return this;- S8 {  m6 s. `/ x5 F6 v
  }
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