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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:
/ n" }/ U, U% p% t
  M# v8 T" y9 \. y+ ]. z public Object buildActions () {
$ {4 R: U# O' K8 V7 }, v) e    super.buildActions();
7 m: h( f& d3 G9 r, P3 |   
* ]* N6 l* K! w; O5 O" Y' t- J* |! G: d    // Create the list of simulation actions. We put these in$ U$ m6 S; O' E1 m% b  R  R
    // an action group, because we want these actions to be( l) q& m% j0 o2 y0 k1 c: L
    // executed in a specific order, but these steps should
+ C/ V. W+ x$ f    // take no (simulated) time. The M(foo) means "The message
7 w$ }0 z; n  G% |; K0 z  x0 ^! t    // called <foo>". You can send a message To a particular* l0 m3 G0 i+ d
    // object, or ForEach object in a collection.
1 q* J7 T& R" {: y  a        + v5 x) P! t7 }* [9 S0 C; o
    // Note we update the heatspace in two phases: first run
( z3 Q) s: {" o    // diffusion, then run "updateWorld" to actually enact the" d" d6 n, N! j5 a5 Q
    // changes the heatbugs have made. The ordering here is+ ^+ a4 u& J- L/ r' t0 F' ~* C
    // significant!7 D' {! H. H0 U& T) C
        - m$ Y. J: W5 W
    // Note also, that with the additional
9 X' _/ v( l+ X7 b/ L" i! U    // `randomizeHeatbugUpdateOrder' Boolean flag we can
& {# I* i4 b9 C* Y+ n& k4 o# J    // randomize the order in which the bugs actually run0 o* l1 r( h  _, S( W+ t" e
    // their step rule.  This has the effect of removing any
% N# B# k5 N9 `! C( V( g    // systematic bias in the iteration throught the heatbug7 F% e& k# A. r3 `+ m
    // list from timestep to timestep; B( _& l" b/ @+ y3 l
        
5 N" Q, X! K6 A1 C& A4 {# E: {4 \    // By default, all `createActionForEach' modelActions have, y( g+ z3 N2 c/ R
    // a default order of `Sequential', which means that the+ s9 F. M# u$ E+ d6 {
    // order of iteration through the `heatbugList' will be. L! m& g. \4 W6 _% ^
    // identical (assuming the list order is not changed
: p. T3 A  `+ D. P, k$ y) i    // indirectly by some other process).
. @5 V5 o0 W9 _( x   
) x8 c, ~0 H+ K( N3 [5 T# N    modelActions = new ActionGroupImpl (getZone ());
) q5 x! ^/ {, S
( G8 U5 A- j& H- V! S    try {3 W7 a# x& v" O+ ~+ C- x: q
      modelActions.createActionTo$message
$ R& i; X& B% X6 E' @' ?        (heat, new Selector (heat.getClass (), "stepRule", false));
' b+ V; v' s2 ^* r6 |' v    } catch (Exception e) {
0 @/ N, {/ J. O. b4 i% F      System.err.println ("Exception stepRule: " + e.getMessage ());/ @2 e$ j9 N" E* b' N
    }! I6 Q; n% S' N* Z

/ E1 Z* p: Y5 ^$ i8 P! l    try {
7 E: x2 X/ h% N0 }- b; B/ c+ w4 W      Heatbug proto = (Heatbug) heatbugList.get (0);
& _" v8 W2 C9 Z+ b      Selector sel = + {/ w( B2 C* l+ d7 W; R' N; ^
        new Selector (proto.getClass (), "heatbugStep", false);. [+ T1 f. ^* S# l- T7 |- m- D5 ^
      actionForEach =( B% d) ^3 D/ }2 Z; N' ]
        modelActions.createFActionForEachHomogeneous$call$ ~2 I( `/ ^) F! \5 C
        (heatbugList,
' _; c0 g- Z, A7 n5 K7 P. l3 F         new FCallImpl (this, proto, sel,+ P2 @5 {9 a2 j4 {' q; ?2 B5 y
                        new FArgumentsImpl (this, sel)));4 R" g; m# t. c! Q- Q4 A
    } catch (Exception e) {3 |; m& r& |" P4 ]8 U3 n9 u1 s& k
      e.printStackTrace (System.err);* I! ?, W, j0 S/ Z
    }
. e- U8 b) E% @/ I; G5 L1 R5 m7 P   
1 ?& N- t  R, g3 T/ x    syncUpdateOrder ();2 m' W1 v. G0 b( w% k* u) e; x4 K

  c- p' o3 q& ~7 x3 R    try {
/ ^' N  t) Y' a1 H& V      modelActions.createActionTo$message
7 \/ Z4 K5 t) U! E        (heat, new Selector (heat.getClass (), "updateLattice", false));
" b; K% @" G1 N% P. X8 i; ~    } catch (Exception e) {
" g- D; w, C2 J% N5 d      System.err.println("Exception updateLattice: " + e.getMessage ());2 x; y+ ^) f5 Q% t6 p
    }
5 b# B  f8 g$ z" u: E6 N6 g        
( @/ e7 D; W7 b0 K    // Then we create a schedule that executes the# G* n) F' A% J% C% y
    // modelActions. modelActions is an ActionGroup, by itself it
( v  g; R( L0 _; [# h. |5 \    // has no notion of time. In order to have it executed in
: X9 `" s. C4 T1 Q7 C" M    // time, we create a Schedule that says to use the
$ G' ]3 {- w8 k    // modelActions ActionGroup at particular times.  This! u0 x+ H1 s1 R" y
    // schedule has a repeat interval of 1, it will loop every
8 R  C2 R* n1 @" T& ?. g    // time step.  The action is executed at time 0 relative to
* o3 {3 g" s6 N; r( I! ]  p4 i* y    // the beginning of the loop.
2 F. ~3 {, |/ o! @" {- t: r4 ^0 i6 k5 }
    // This is a simple schedule, with only one action that is
' r% g$ f+ |2 s( C% r; H    // just repeated every time. See jmousetrap for more
; B- Q: {7 Z1 r: t    // complicated schedules.
* C; u1 X; }  T* J: j, D  
* G) }  J! V" ~. R    modelSchedule = new ScheduleImpl (getZone (), 1);$ K. p' Q8 h: z$ I  ^. Y* E* o
    modelSchedule.at$createAction (0, modelActions);
9 G$ g" G% J' T        
4 c8 e/ F& t5 k1 M  o; [    return this;- O' D& G0 i& `/ a# ~
  }
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