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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:( G2 ~& C8 W5 r& e0 c6 r
* p$ u; g0 U# r9 x  ?% {3 d
public Object buildActions () {* i1 {/ S: x- S( {
    super.buildActions();% z+ K+ H( Z$ v4 a
    * p0 A8 `: h/ f2 T% b6 u
    // Create the list of simulation actions. We put these in
) A8 l8 C: I' @1 F9 _    // an action group, because we want these actions to be. a6 K% c$ h9 n' u
    // executed in a specific order, but these steps should6 L; F. |- g6 J
    // take no (simulated) time. The M(foo) means "The message4 k  Z8 a+ B8 M3 [. l4 C. Z1 x
    // called <foo>". You can send a message To a particular2 ?  Z/ z' z$ Q+ h
    // object, or ForEach object in a collection.' j2 g9 O8 _' M9 \' ]& |5 d
        
3 W% Q1 g/ d* {9 q$ y    // Note we update the heatspace in two phases: first run: r0 a8 [+ ]& z1 d8 m
    // diffusion, then run "updateWorld" to actually enact the/ n! r, R/ M! `$ Q9 V9 u
    // changes the heatbugs have made. The ordering here is) Q; S# K* e( a) q+ F
    // significant!
% B9 o6 N' L9 G2 L        
% }8 Y' D% P  b: L* u& ^. v2 u2 t* n    // Note also, that with the additional
4 _( @4 E4 Q6 @3 l# a    // `randomizeHeatbugUpdateOrder' Boolean flag we can7 J: x4 x) b% F( L, t
    // randomize the order in which the bugs actually run& D+ _( j$ i) ~2 |/ u
    // their step rule.  This has the effect of removing any
4 ?" l& w2 U+ E, U9 x$ G9 `    // systematic bias in the iteration throught the heatbug9 k# n) }2 m5 y- t6 k* U
    // list from timestep to timestep
1 |$ N: \  t# L' \        
# F( n! w% ^  y, ]    // By default, all `createActionForEach' modelActions have
* q2 y8 e2 F  q* ?; w    // a default order of `Sequential', which means that the
  i. @$ j* d, w/ H5 C' {8 J, n    // order of iteration through the `heatbugList' will be1 T' \$ t3 V4 z) v# X5 C" i
    // identical (assuming the list order is not changed
2 q0 s: Q3 V( H. `# j7 P    // indirectly by some other process).
! V. o4 f: q- X* r# B   
3 G1 j  I% t" U. R0 Z    modelActions = new ActionGroupImpl (getZone ());+ }2 C+ O. o& x
/ r/ X6 ~+ x/ [4 [
    try {/ `) b  J+ d0 ?) d/ C0 P4 l/ O$ N
      modelActions.createActionTo$message: I1 |) J% n6 ^7 J: h
        (heat, new Selector (heat.getClass (), "stepRule", false));
% T5 G- j4 G! @: s$ Y( W7 }    } catch (Exception e) {5 p1 \2 Z/ H) _0 d  n
      System.err.println ("Exception stepRule: " + e.getMessage ());
0 }, Y& U: }7 @, q    }6 d" F% ^  J" A2 [: S
5 t2 p! \( ~  y. M+ T( z/ E6 j, |" {
    try {
* R$ m3 N" w4 X3 L4 K$ y      Heatbug proto = (Heatbug) heatbugList.get (0);, _/ [3 c' }7 u+ i
      Selector sel =
* j2 W4 k( c* k        new Selector (proto.getClass (), "heatbugStep", false);
5 ?, [3 P, v/ O: m; ^      actionForEach =  `/ _) M% C8 {% ^
        modelActions.createFActionForEachHomogeneous$call6 n2 _4 o- @" W' W% S
        (heatbugList,
9 E$ `: ?, _6 `6 I( |* i7 F( R         new FCallImpl (this, proto, sel,) s+ H3 B0 O8 a  o4 I2 S
                        new FArgumentsImpl (this, sel)));1 E2 W9 T/ O8 W! J* ?
    } catch (Exception e) {
; b3 r9 [9 z1 k9 E6 |      e.printStackTrace (System.err);
+ x( \: d3 r0 R- C. O# T6 C    }. O; m7 B) v6 @0 Q" F
   
; @" h+ [. p6 X0 Z1 x( U. {5 l    syncUpdateOrder ();2 u2 n2 R# U( z' F5 L5 m5 \" [4 ?

, g$ i( M% d9 N5 \3 W) `" n: _5 J    try {, ]0 C# E' e8 ~' B5 u9 h
      modelActions.createActionTo$message - p1 T7 u; y, q4 X/ U2 P: t( f* s
        (heat, new Selector (heat.getClass (), "updateLattice", false));
6 V3 G4 K9 h' b: }& {, V    } catch (Exception e) {
4 }% v: a2 }" w  F  g1 n      System.err.println("Exception updateLattice: " + e.getMessage ());* ~- m- Z. y5 E4 \, t# x& Q
    }7 |3 w- l0 n- D8 }  B& D4 n
        7 o' m$ i7 E0 D
    // Then we create a schedule that executes the
. z- U" X1 c7 b% Y7 y2 ~    // modelActions. modelActions is an ActionGroup, by itself it
% B1 E5 j1 w, A/ r2 I! q+ D    // has no notion of time. In order to have it executed in( Q3 |# t, P( E! K6 w4 Y4 i7 F. x
    // time, we create a Schedule that says to use the
6 D! {6 M* g7 O, ~8 o# h3 P    // modelActions ActionGroup at particular times.  This
- O* D  i+ `6 y* `3 u    // schedule has a repeat interval of 1, it will loop every$ q1 f' Z8 I8 E
    // time step.  The action is executed at time 0 relative to* B% d6 g: c0 x) ~
    // the beginning of the loop., b9 v+ ^3 K$ `& L. ~
! ~- E4 ^8 o& c; p/ t
    // This is a simple schedule, with only one action that is
7 C- o: ]2 \6 f8 r) y) X    // just repeated every time. See jmousetrap for more
" |7 B4 I! E# k+ N3 n* {    // complicated schedules.! @' B$ d1 U: D; K* I
  
* C* @5 H4 L6 p# }& ?$ b" A) q" ]# m    modelSchedule = new ScheduleImpl (getZone (), 1);
& ]& I: M: F5 }8 z: |' p% l: i9 F  _    modelSchedule.at$createAction (0, modelActions);
9 G. I' k7 h# g1 ~; o6 x! g        
& s0 _3 b8 H3 Z: V& k* ]! W    return this;
7 Z2 _$ r  E" G! ]7 L) ^1 F- i3 F2 ~  }
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