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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:* w+ B  I0 C* z/ R& s5 l9 b7 ]7 ?
* P" X% R, [2 r' y8 X; s, @
public Object buildActions () {
' r& C1 [) m* D* d/ X    super.buildActions();
% [7 Q. U% L4 m) x' j, Q   
$ Q0 s) h% o# Y* G/ h    // Create the list of simulation actions. We put these in
* W! n# Q8 n4 K    // an action group, because we want these actions to be
- ?$ F# V# D7 K: B( U3 S& }9 J    // executed in a specific order, but these steps should
% |' N8 ?0 c9 c( v2 a    // take no (simulated) time. The M(foo) means "The message% K  S5 e: z7 s& e4 ?& W
    // called <foo>". You can send a message To a particular$ y1 K+ i+ Y; F$ z2 |$ u3 j! _
    // object, or ForEach object in a collection.
  d3 v8 H4 p2 n6 J5 e        
, P5 h# b; D! x& U) P5 [    // Note we update the heatspace in two phases: first run
$ D" _0 y) O. m! g    // diffusion, then run "updateWorld" to actually enact the
2 C" t* k6 P! P1 s( M, P: }0 R    // changes the heatbugs have made. The ordering here is' e4 o4 J" p! \+ C( Y+ r
    // significant!- `: F4 ^, m7 Y% ?! G
        
3 l+ X  `) B0 E7 n    // Note also, that with the additional1 Z& P6 d7 f9 Q- b% p
    // `randomizeHeatbugUpdateOrder' Boolean flag we can% e& x# q# h# `1 W4 ~0 T8 {
    // randomize the order in which the bugs actually run. B- ~- @9 N0 @, S+ x
    // their step rule.  This has the effect of removing any
; z3 }0 Y) u1 ]* |    // systematic bias in the iteration throught the heatbug" S( j  }9 s; T4 a8 w$ l: Z: L2 \
    // list from timestep to timestep% Z# D+ B4 g  t* ^7 |; k
        
0 m( v/ O1 k( V7 M& `    // By default, all `createActionForEach' modelActions have9 L! X2 ]0 }$ r2 G; t' U
    // a default order of `Sequential', which means that the# R& Q1 `" @3 t: B  M
    // order of iteration through the `heatbugList' will be7 z1 [0 T) d/ ]" z
    // identical (assuming the list order is not changed
& S5 P, `/ r: v    // indirectly by some other process).
5 @4 B6 q) t  O% Z5 b   
) A4 ^! z2 E9 `    modelActions = new ActionGroupImpl (getZone ());5 m# G, M3 }% e& o

5 ~/ u# |8 ^$ h' p    try {7 [* a8 S4 L" t4 b1 {
      modelActions.createActionTo$message$ u: k7 p6 m' d7 d5 d' a9 G
        (heat, new Selector (heat.getClass (), "stepRule", false));
( B6 ~8 d6 w7 B( b! T" c+ ^    } catch (Exception e) {
1 x' u2 t! \- w; f5 ]8 e      System.err.println ("Exception stepRule: " + e.getMessage ());
' t/ M7 d0 r- W( r" {    }
- `* `" j% V5 \) J$ w* {, U# a' S- S
    try {
" b2 K4 U, Q! `2 i* n      Heatbug proto = (Heatbug) heatbugList.get (0);
) G' ]# ^: Z# h      Selector sel =
7 w+ m* _, X0 N! \& X4 i        new Selector (proto.getClass (), "heatbugStep", false);
, O& G5 S" J+ h5 f9 X$ b8 T$ U      actionForEach =( v/ G8 d6 r, o
        modelActions.createFActionForEachHomogeneous$call
- \% k& m$ k( V) ]6 w8 e        (heatbugList,
8 H3 I6 F8 T/ Y8 z3 M         new FCallImpl (this, proto, sel,
( z% z! T1 G9 H, T' Z                        new FArgumentsImpl (this, sel)));
, R' H7 i- e% j. V! D    } catch (Exception e) {' r! y2 U9 v+ A' y- u5 S
      e.printStackTrace (System.err);( t- T7 H, y5 S7 A- y# V2 d/ c/ u
    }
0 b" e# c0 Q  k# ?    / ]6 ~- q: R+ t  j; `: u6 C  O5 t
    syncUpdateOrder ();
  m" x% m! j" W* o! K# b7 T" x2 Q0 c  h7 I9 t& n
    try {
  F) Q. o& G! M; B0 K' F      modelActions.createActionTo$message & l1 b6 E  o" E& o( Q9 P
        (heat, new Selector (heat.getClass (), "updateLattice", false));
+ |% _0 l5 k2 a$ A    } catch (Exception e) {! `9 `. {& x/ D; J9 V
      System.err.println("Exception updateLattice: " + e.getMessage ());$ W; i4 i% s. S
    }" s9 Z: K) ^& U7 N6 n
        
, v. ~8 ]' b& F2 x    // Then we create a schedule that executes the) |' T0 E4 z$ r& v: t2 k
    // modelActions. modelActions is an ActionGroup, by itself it1 P4 w: A3 s' U$ `: p! w
    // has no notion of time. In order to have it executed in
: k4 P/ N6 r" _$ n    // time, we create a Schedule that says to use the
' Q7 q( o' q" U7 a4 N    // modelActions ActionGroup at particular times.  This, Q, i  q6 q/ f% S" z
    // schedule has a repeat interval of 1, it will loop every
. g- s/ p& E8 m0 C5 R5 t    // time step.  The action is executed at time 0 relative to' T5 b7 c+ e3 F
    // the beginning of the loop.
; A/ o9 D9 N- k" ]9 Q3 M
) }8 j* v" I0 t" h    // This is a simple schedule, with only one action that is8 V5 n, Y- o  T) F$ G( w6 Q, c4 d
    // just repeated every time. See jmousetrap for more1 W! b+ g+ u0 i- F( s1 ~+ {5 u
    // complicated schedules.7 ~3 E$ @- s2 R  F
  ' z; J; S# g: ^7 D. P  F
    modelSchedule = new ScheduleImpl (getZone (), 1);- @& A1 L- m6 `
    modelSchedule.at$createAction (0, modelActions);
, [( j( {' f6 b* q        . m7 ^. A9 D6 R0 G' A& [4 x
    return this;1 ~! m4 b! Q& S; o2 Z5 u4 x- y. O
  }
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