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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:4 @; m: e: ]6 @, i8 o

, K7 {/ E. K) {) R" M0 N- Q public Object buildActions () {7 F. W, p" v* {$ T& ?6 R
    super.buildActions();
: X, h$ J) T' ]2 [! M/ b    # [4 {7 \2 \7 a# d6 T3 T
    // Create the list of simulation actions. We put these in9 U1 B* H; w' P
    // an action group, because we want these actions to be
& R# ?  i2 ^6 e2 N0 p+ J6 t' ]    // executed in a specific order, but these steps should' l5 _- E4 Q1 R+ D) A
    // take no (simulated) time. The M(foo) means "The message
6 o9 ~7 D  b( o6 i7 ^; b    // called <foo>". You can send a message To a particular
9 [) V& Z$ a6 X2 Y    // object, or ForEach object in a collection.
  B  k* e" I6 W- o, g: t0 E6 ]! t        
4 _5 ?  q4 }- x0 M: k2 Q% A    // Note we update the heatspace in two phases: first run
# Q$ N5 K0 B2 a4 o6 a+ s7 I    // diffusion, then run "updateWorld" to actually enact the
  y$ f' a; A* o* [    // changes the heatbugs have made. The ordering here is
0 z' ^; y3 J8 l    // significant!
# B0 c5 r6 u& H        
% p+ ?! ?  _4 C8 W  w! P    // Note also, that with the additional& M7 K7 a( c' `' c
    // `randomizeHeatbugUpdateOrder' Boolean flag we can  Z0 a% s; c6 u: P5 }2 U
    // randomize the order in which the bugs actually run4 k# b( |$ y8 d9 I+ k
    // their step rule.  This has the effect of removing any
6 ~  C& n$ z2 }, j) `    // systematic bias in the iteration throught the heatbug
2 g2 c5 g+ O' Z2 C! L" B* ~! V    // list from timestep to timestep
! K+ x, b3 ]. H: q2 R, d        
7 S8 T9 i- a2 D/ \# q    // By default, all `createActionForEach' modelActions have
, }, B5 e: N  u' O+ F! a: C* m    // a default order of `Sequential', which means that the$ o$ Y8 ~9 q0 W2 D
    // order of iteration through the `heatbugList' will be+ R+ J* N& l: w* V0 g$ {
    // identical (assuming the list order is not changed; Q% \2 o5 Q9 |' j
    // indirectly by some other process).9 r$ h3 U  _- X3 o; h- e/ V5 G. M
    9 T1 @1 s; d" x3 L* k% X
    modelActions = new ActionGroupImpl (getZone ());
* _1 Q  k$ N* w0 _$ j/ U7 x. N
7 ]" n' B6 y5 ^$ c4 m    try {
2 ^! W1 n! r6 T0 R8 X8 y9 {# a# m      modelActions.createActionTo$message0 j! T8 ?* `$ L& y
        (heat, new Selector (heat.getClass (), "stepRule", false));
' H0 T1 L5 }! p) @    } catch (Exception e) {
1 ]  Y# w$ n4 R6 N      System.err.println ("Exception stepRule: " + e.getMessage ());& n" T" |# O# Y6 [* Z% ?# e
    }  F  N4 d) Z8 v+ P+ Z2 T" h

8 e4 m9 F' `$ _' A" e    try {
- p  g6 E" P) j$ W8 f      Heatbug proto = (Heatbug) heatbugList.get (0);* q; n9 X! P$ n. z- _
      Selector sel = 8 d! Z9 p0 u% n$ v7 _
        new Selector (proto.getClass (), "heatbugStep", false);
. E3 i9 q, L8 ~/ E- X0 \      actionForEach =
3 R) w0 g, v2 D0 X8 I. H! _7 S        modelActions.createFActionForEachHomogeneous$call( T  D5 i% ~& m! k$ G9 @
        (heatbugList,/ `7 w9 X; p% f; ^, W' G% ^
         new FCallImpl (this, proto, sel,; M/ d" ~) d2 T. m5 i; B. h$ ?) o
                        new FArgumentsImpl (this, sel)));
6 K+ D; S! L  z) E/ X6 a4 U1 n1 l" e    } catch (Exception e) {6 b0 X/ C, R" ^0 P3 M) q
      e.printStackTrace (System.err);
( F) E) d% U  G" Z( U, p) g6 s    }
' u0 Q6 m& N4 K/ q0 ~% Y' Q& ]      ?2 L( q0 Z# U, p' |  P: C' |& q
    syncUpdateOrder ();1 W5 U1 h0 `0 K+ G
3 u; w  t' b, u3 `. y8 M
    try {8 ?, P3 \- {, c+ n
      modelActions.createActionTo$message 6 T5 X" e2 r; X2 v
        (heat, new Selector (heat.getClass (), "updateLattice", false));# c2 l$ l3 @; D  c# f# a6 o: j+ x
    } catch (Exception e) {
0 E. k7 r' Z( a; l" y' F/ _3 @8 c      System.err.println("Exception updateLattice: " + e.getMessage ());- V9 _" R5 Y, l- v" A% V- D1 v, \
    }- ~* Z- L% ]' R
        
% {. e2 |) S/ z8 o# o5 C    // Then we create a schedule that executes the
' L- ]0 i2 A; H' j3 Z    // modelActions. modelActions is an ActionGroup, by itself it+ |6 f/ Q' Q/ E* k6 w
    // has no notion of time. In order to have it executed in" i9 ^* J% F9 D3 @8 ?. C, P: E
    // time, we create a Schedule that says to use the7 M3 x4 {$ U& F2 k" Q, y9 n% m
    // modelActions ActionGroup at particular times.  This
9 h8 D! D4 D0 H5 r7 @' |    // schedule has a repeat interval of 1, it will loop every) [$ k) ^0 K5 B# C6 H4 x
    // time step.  The action is executed at time 0 relative to- Q3 ^2 R1 b6 N4 o" w
    // the beginning of the loop.
/ ?* G7 |0 |! n
. e5 q; ~# O: g' h1 S, E; ?; D    // This is a simple schedule, with only one action that is
' g. d2 {5 W/ ]7 \' a6 m    // just repeated every time. See jmousetrap for more
8 j" P  q! |1 b! T3 R* ~    // complicated schedules.
; Y7 A4 c  p2 p2 j2 e3 Q& u. y  
, Q: e; }7 ^& K    modelSchedule = new ScheduleImpl (getZone (), 1);
, @/ l& l: F" s$ H, j, r. {    modelSchedule.at$createAction (0, modelActions);0 A& C  e1 b: i. X4 c
        
8 J! \3 V/ _- m    return this;8 q8 O7 O* u, @4 v
  }
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