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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:' L. N, ]% Z" d. I2 ]
8 K. b' f7 c8 U; ?9 _
public Object buildActions () {
% G% x) @+ Y0 q) H    super.buildActions();
& y% R5 Z4 O  q8 t' |2 D* ^    # M3 _) D6 f% f' P" A( s+ e/ ?1 d
    // Create the list of simulation actions. We put these in0 R" O4 ?, V- }0 K; e7 j
    // an action group, because we want these actions to be
" F7 k3 v* c; I7 e    // executed in a specific order, but these steps should
+ g: X: A6 a' F" ?8 G! }) J' M    // take no (simulated) time. The M(foo) means "The message
7 Q8 S0 E. N- B2 w6 \    // called <foo>". You can send a message To a particular
/ q/ y8 E' \8 }9 K0 R5 {5 {    // object, or ForEach object in a collection.( h; s8 H' S9 N7 S" J% p
        7 X4 J% s& z  a3 r& g2 {
    // Note we update the heatspace in two phases: first run
  S- u  Z7 M$ G2 M3 W  H  a+ V7 u    // diffusion, then run "updateWorld" to actually enact the
! o, e1 J3 F, ]" j' n0 S    // changes the heatbugs have made. The ordering here is
  v. u# }, f6 L6 I6 ^! ]3 P    // significant!+ `% [& F% J! K& g; \8 [
        
3 c; w$ a4 V5 {  v3 s( i    // Note also, that with the additional
4 C' f/ `) \; Q. v: D  d* m    // `randomizeHeatbugUpdateOrder' Boolean flag we can8 R- u  z6 K6 {
    // randomize the order in which the bugs actually run
3 d# I6 {+ O3 F$ t) _! W0 L2 a0 i    // their step rule.  This has the effect of removing any0 r& \& V- k* [; @5 [+ f; y
    // systematic bias in the iteration throught the heatbug1 |8 Z4 @7 s; ^8 n2 H
    // list from timestep to timestep
% R+ x: O: {* r! S9 N        
7 R+ a5 ^3 o2 k( y    // By default, all `createActionForEach' modelActions have3 F6 g) f. N" F1 {$ Q8 B
    // a default order of `Sequential', which means that the4 ]8 x! c! }( D' O: y; W$ K  n) h
    // order of iteration through the `heatbugList' will be4 a) i4 F) h. W4 A" M
    // identical (assuming the list order is not changed! @' _! @. b  P
    // indirectly by some other process).5 @$ j/ j) x' Q0 F* u; b
    4 C- w* Z: Y. ]! z
    modelActions = new ActionGroupImpl (getZone ());
) A! ]% t/ z6 \( l
$ B) v) ]8 T+ m# B& p1 g7 h9 R    try {
- W& @6 }' L" U: S  Z* D      modelActions.createActionTo$message
4 t( `+ E4 B4 p$ U" S" `, B        (heat, new Selector (heat.getClass (), "stepRule", false));
" o6 S4 j# i8 e0 _/ x    } catch (Exception e) {  L. ~8 _; _' p; ?- o# \
      System.err.println ("Exception stepRule: " + e.getMessage ());2 u$ t: I' E/ B: Z1 d
    }
( R( D3 _+ d4 a
+ _. z: P7 v+ u! T" r8 i    try {4 N. E& Q; q7 B' q- F4 G& P! [
      Heatbug proto = (Heatbug) heatbugList.get (0);
+ C- q( `6 P  Q5 ~& F      Selector sel =
. ?" ~6 C  q2 [2 i. C1 |+ n        new Selector (proto.getClass (), "heatbugStep", false);
- \( G. U2 @9 g. i( S! B! S      actionForEach =( l" F  M( ^" q
        modelActions.createFActionForEachHomogeneous$call5 o8 ]. [5 x) `# y' N
        (heatbugList,
+ P7 |+ \( T! z  Y; k         new FCallImpl (this, proto, sel,3 l+ @! t2 I6 b0 x* H
                        new FArgumentsImpl (this, sel)));, k" k4 ?- m1 V. f' r0 d
    } catch (Exception e) {7 U  t" G. j* v+ _. E( [+ r2 r" I% k' G
      e.printStackTrace (System.err);+ ]2 ~4 Y( f5 c1 @: t/ s
    }
' W' u( X: |4 Q/ K    : C1 P, ]: J! V7 S1 ~) F9 F6 \$ d
    syncUpdateOrder ();
/ k6 ?9 i- d1 t3 {! a) s% P/ h+ f, g: H! ~! v4 O& t" N+ D! V9 `
    try {: {+ L" v/ w9 f
      modelActions.createActionTo$message % E. k: @7 C0 ?% u
        (heat, new Selector (heat.getClass (), "updateLattice", false));! ^, Y3 |4 V( d/ K" ^5 s  L
    } catch (Exception e) {
- Q+ w* x! W4 g& [% f+ }+ L1 h9 l      System.err.println("Exception updateLattice: " + e.getMessage ());
% @; x8 ]$ e( E: g& ~! g8 m    }# c: O( e* g8 ?9 L7 B( h5 B
        
+ X5 q% X0 h4 k2 @! q    // Then we create a schedule that executes the' f3 V5 i) c3 l: T% ]% s$ |. _
    // modelActions. modelActions is an ActionGroup, by itself it" W5 u) V: X! n& B  L! g' J2 a8 p) f
    // has no notion of time. In order to have it executed in8 j; _$ o2 }2 @0 m: `; Y1 W
    // time, we create a Schedule that says to use the! c4 g- N0 _% I/ `, Q! J
    // modelActions ActionGroup at particular times.  This
* [! z" Y9 f# r# n8 e: }" R    // schedule has a repeat interval of 1, it will loop every
  y* t& K# q6 W6 E: B6 Z* w& H( p    // time step.  The action is executed at time 0 relative to; o& V2 q* S) K, l3 p
    // the beginning of the loop.6 |: |& m" W( t: {; W8 x( M

- a1 a; g; j$ |# `( q' n) T    // This is a simple schedule, with only one action that is3 g' G/ k! D5 T0 Q9 p$ p( o1 u; N7 F; s
    // just repeated every time. See jmousetrap for more
1 C; M0 a( U/ Q    // complicated schedules.
( _1 I2 t: w7 P6 d" Q    e$ r* i- u  g6 K& s
    modelSchedule = new ScheduleImpl (getZone (), 1);
* X3 q9 [8 U. q* s5 S% d; v5 c) \    modelSchedule.at$createAction (0, modelActions);- g5 [5 c' z8 k, |( c/ |
        / V- V6 z. c) l# S/ F% Q
    return this;; U& M% T* [8 v7 J4 T
  }
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