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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:6 P) G* S0 m$ \2 C0 ]* N

0 j, f; Z9 Q- d! x1 G public Object buildActions () {# ]* X4 ?# L6 `' q" b' U" j
    super.buildActions();
7 X5 Z; O, y) y% Z# M% s! I   
- y0 `! c! L( B8 i. k    // Create the list of simulation actions. We put these in4 L8 [6 G' |* G& Q
    // an action group, because we want these actions to be7 Z$ ^6 w. @* z6 Q' Q
    // executed in a specific order, but these steps should' c  }1 N2 @: J1 p+ k! v! ]: Q  ]0 X  f& q
    // take no (simulated) time. The M(foo) means "The message7 @! a( p0 m9 V' f! G
    // called <foo>". You can send a message To a particular8 w1 w, A& C9 c' d) k
    // object, or ForEach object in a collection.8 b# S: x. L+ `, q: P. K
        
" O9 W4 C% u8 c: s: Y    // Note we update the heatspace in two phases: first run
( g6 h7 A5 o1 A/ Z' K    // diffusion, then run "updateWorld" to actually enact the
1 k! N" f; @1 T6 v$ ~8 L    // changes the heatbugs have made. The ordering here is
- G6 y0 `* K3 X( `3 I  ]& |4 p    // significant!
/ |4 o6 L( ]' h! i+ Q        
- e' N+ [  Y$ d    // Note also, that with the additional9 _: h, H$ o0 K* A* Y
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
# Q$ V+ j$ o/ S* F# I) s; ], j    // randomize the order in which the bugs actually run
( \& i0 j1 M6 r    // their step rule.  This has the effect of removing any  C9 X" O5 h+ T
    // systematic bias in the iteration throught the heatbug
% h/ i, M& f( W( h    // list from timestep to timestep
/ ?/ p3 n; `+ q; O4 N        
0 J4 E- W" D% f% L( p    // By default, all `createActionForEach' modelActions have" u. E% f0 c% p7 M' q& `! b0 e; \- z
    // a default order of `Sequential', which means that the7 B" g9 ]' E  o0 ~: y3 S+ A
    // order of iteration through the `heatbugList' will be3 V: G7 x5 W( K1 {  f0 j
    // identical (assuming the list order is not changed
% _9 |; `  L8 r3 E4 f- E    // indirectly by some other process).4 D% ?% v& i0 u! f
    9 _$ N: u) x! V: f" \: `# p
    modelActions = new ActionGroupImpl (getZone ());
9 B' ~  j% t, k; o2 R$ T- m/ n
' Z$ y* C+ v% r4 H* E2 J+ A) r' r5 |    try {
/ Y9 e: Y; w2 j7 _1 K. s. v      modelActions.createActionTo$message/ T5 O* R: r. _, J) Y! @. ]
        (heat, new Selector (heat.getClass (), "stepRule", false));, v- C7 P" M$ N  E' L
    } catch (Exception e) {
5 \% e5 w2 W3 K. Y5 z) u8 N      System.err.println ("Exception stepRule: " + e.getMessage ());/ U% D0 U- J$ ]/ ~- M- ?4 H% m8 c
    }
/ j3 X/ q' X5 a' r) D) C8 H  N
) f, J5 e4 }0 e    try {
% m$ k1 I, t3 q+ t      Heatbug proto = (Heatbug) heatbugList.get (0);: c8 K1 E9 y9 D, s/ m+ o" {+ F
      Selector sel = 0 a: h0 G1 f& Q& N) u4 F
        new Selector (proto.getClass (), "heatbugStep", false);
( E" H( O2 Z4 z, v' j      actionForEach =2 Z' a( B- x9 w# C$ Y7 f8 H
        modelActions.createFActionForEachHomogeneous$call
& G8 [+ U  _" u/ n* p1 }9 `        (heatbugList,
7 Q, Q* p8 u/ r: M% |, ?         new FCallImpl (this, proto, sel,  H- t, h3 E! p4 m* C3 O) V
                        new FArgumentsImpl (this, sel)));1 m$ D' w# v# K/ A
    } catch (Exception e) {
( D  m" \4 h! N2 T) c; ]      e.printStackTrace (System.err);; K5 v) {9 e5 w5 B8 T
    }
$ j  \+ ~3 I- {% |; b   
0 T/ N5 X8 M; p0 ]- |" Y    syncUpdateOrder ();
5 |  Y. O4 l7 A
+ L3 B7 m9 a  C% B8 \6 w9 @    try {
4 p5 _$ N" u) ^9 u5 |. a      modelActions.createActionTo$message
8 Y) F; e& s% |1 Z0 p7 l- t- N) c        (heat, new Selector (heat.getClass (), "updateLattice", false));
* @6 O7 ^, `" X: R1 }1 A" |& P$ j2 p    } catch (Exception e) {# ]8 \& w; I9 }. }+ N. `
      System.err.println("Exception updateLattice: " + e.getMessage ());
' `2 I6 h3 J' X! n8 m! S' y    }: a4 X/ K- @3 Q6 s
        
+ |+ r. O9 H' |- n3 M+ `    // Then we create a schedule that executes the
2 y# Z) Y1 k' W- F! a3 l) {3 X    // modelActions. modelActions is an ActionGroup, by itself it
! k: C8 J& n; N9 }8 _$ v    // has no notion of time. In order to have it executed in
* Q1 W: C3 M3 I5 y, q    // time, we create a Schedule that says to use the
+ {& M4 O4 D1 Z: {$ u# t    // modelActions ActionGroup at particular times.  This9 H8 i6 H) J3 z* x1 H! {
    // schedule has a repeat interval of 1, it will loop every
0 `/ X. g3 p$ W. [$ P, Z    // time step.  The action is executed at time 0 relative to- Y- A5 M3 b" S9 v
    // the beginning of the loop.2 {! W+ f2 p4 G. ~# h

1 ~/ E5 X9 ~: E+ s2 L    // This is a simple schedule, with only one action that is
5 R4 ]7 n. _/ _2 G$ }7 n    // just repeated every time. See jmousetrap for more5 O- u; D9 J5 U3 B+ N$ G8 T- J' h
    // complicated schedules.* E1 A/ Z9 D' V7 s' H4 U
  
3 v9 q1 x! B7 n4 t* r* W' X    modelSchedule = new ScheduleImpl (getZone (), 1);7 J2 b* C2 f, c1 ^: ?2 {" m: v5 W- ?- W
    modelSchedule.at$createAction (0, modelActions);
& N) @: C  y2 U, r1 S        ' p) V( Y5 ~4 z/ r9 `8 S- @
    return this;! ^) D9 V8 |1 q# \3 m  F3 N: u
  }
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