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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 m( d- P" ~. G* k" j3 |+ [6 Z& w0 w+ e
0 w; _% x* w  X; t7 K
public Object buildActions () {
" K2 \# K5 O. C  v' m$ \6 k    super.buildActions();  M1 S9 v+ T3 G2 k4 s. ^) x/ ^
   
3 b8 D" Z4 i( I# o8 M. `    // Create the list of simulation actions. We put these in
+ `  x9 r" F% A0 C$ y9 L    // an action group, because we want these actions to be' o! |8 r* z' b1 k% |: F% U
    // executed in a specific order, but these steps should9 t" I; R  l6 ]; [: y/ x( b3 r3 y
    // take no (simulated) time. The M(foo) means "The message9 |6 z9 N, `9 b% Q& \
    // called <foo>". You can send a message To a particular
# J- p0 y& v4 c    // object, or ForEach object in a collection./ q8 D& X: i0 q: N, _
        
$ i+ Q2 g  I; Z" g& b    // Note we update the heatspace in two phases: first run
& D- a! R5 [. @! e+ ~- _    // diffusion, then run "updateWorld" to actually enact the
" T1 d( L: q2 u7 H! i7 u. j! b5 q    // changes the heatbugs have made. The ordering here is6 z# w0 h) b# g- [, J3 a
    // significant!3 x4 j8 E% Z8 B  H& ^/ M
        
! f* e+ k4 A, `9 c3 {    // Note also, that with the additional* y7 S8 N1 v$ I- ]* h3 r
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
5 C+ X- }- U7 U9 @2 e" X/ p    // randomize the order in which the bugs actually run0 h- L4 J% M% b3 Y
    // their step rule.  This has the effect of removing any; b$ T) u6 E; L" S* d& R# c+ l2 X8 F
    // systematic bias in the iteration throught the heatbug
$ }6 T% w+ x3 j% Z! ^    // list from timestep to timestep
" s1 i; w6 `( w, U4 j0 H        2 j# B/ T4 s2 z  Z" z" S* M
    // By default, all `createActionForEach' modelActions have3 r- x" i* z: {. ]- [
    // a default order of `Sequential', which means that the1 n9 ^- F) ?( t( O4 Z5 R# y2 A
    // order of iteration through the `heatbugList' will be
3 u0 `. J* B! q! C4 ?) s& Q    // identical (assuming the list order is not changed9 h) j% |. Y# j2 q
    // indirectly by some other process).2 B: w% z8 Z! @: y. H( k3 r
    ' z' i. h* k( t. J8 x- s
    modelActions = new ActionGroupImpl (getZone ());
: B) b8 C. y* L! b6 h  d; B/ P" e
. N/ d1 U7 R* E# x) w. e0 u    try {( f( K- i' e" f
      modelActions.createActionTo$message
  o, _6 H% Z& o+ b" r        (heat, new Selector (heat.getClass (), "stepRule", false));; J9 m# Y: r+ D7 J( k4 ~
    } catch (Exception e) {: A; z. x' S8 e  P8 _2 r. j9 _
      System.err.println ("Exception stepRule: " + e.getMessage ());
6 ]$ N& k% q2 Q, y: U* @; y7 N    }/ a/ l  a" P9 w4 y, T
7 i, e  _+ T- t' j' t3 p$ y
    try {
) n" m9 J' {2 m4 y7 I: u" D      Heatbug proto = (Heatbug) heatbugList.get (0);
$ {: \4 ?' Q% C. y/ I      Selector sel =
7 X" T% _5 J5 K6 @        new Selector (proto.getClass (), "heatbugStep", false);' c5 I$ {# a3 C. K" f
      actionForEach =
. \" h2 F' m  a2 G, G) Y2 T) T        modelActions.createFActionForEachHomogeneous$call2 j1 I# E3 J& W" n
        (heatbugList,
2 `/ h, j" I3 j5 p% i) @         new FCallImpl (this, proto, sel,
& n; @- H  ]: l$ J                        new FArgumentsImpl (this, sel)));
- U+ |$ n, k. c. J, ~. i    } catch (Exception e) {
: H+ w+ w+ t+ g. x2 f- B+ w      e.printStackTrace (System.err);
" V- I  m6 q6 r* r5 \( }    }* c  z" r; \2 f+ o) p/ i
      Y  A  @+ O( }) Z& y, S$ d
    syncUpdateOrder ();- j2 Q0 J7 m( |1 d- z4 R% h
( b( A8 N+ ?+ F0 B6 O; a9 L
    try {
3 F% H- c# ~0 J+ H      modelActions.createActionTo$message
0 z+ M) r0 R7 a' K4 p        (heat, new Selector (heat.getClass (), "updateLattice", false));
$ Z" {: E# [. G1 K) t. W/ e6 R    } catch (Exception e) {9 ?; v+ i/ B+ q. l+ N
      System.err.println("Exception updateLattice: " + e.getMessage ());! _( E2 P0 D" J7 k0 K, U
    }5 p/ \: K7 E% l' x$ F
        
* q/ Q: N" f) Y( b) C    // Then we create a schedule that executes the
' k* o) f5 V. c5 D    // modelActions. modelActions is an ActionGroup, by itself it
6 {+ \: @3 }! Y, n    // has no notion of time. In order to have it executed in
. a/ D/ k' Q( \    // time, we create a Schedule that says to use the
- E( B3 ]7 H* q  W* p    // modelActions ActionGroup at particular times.  This
+ x) d, Z5 {, o) A+ p. I; @    // schedule has a repeat interval of 1, it will loop every
/ p, l) L* y. r2 e$ S    // time step.  The action is executed at time 0 relative to& p! e7 [. `( S% ?0 d! Y5 \
    // the beginning of the loop.
3 p! K+ W: z! w0 G4 d# B6 \
2 K9 i" j8 J/ _    // This is a simple schedule, with only one action that is2 ]5 R. }: z5 c) M2 {
    // just repeated every time. See jmousetrap for more
# K2 ~% r) I2 N    // complicated schedules.5 l" y5 X* b% W" {' O2 s
  ; V/ i1 P$ Q1 _& w& \
    modelSchedule = new ScheduleImpl (getZone (), 1);2 _; V3 [: W7 y0 L9 r
    modelSchedule.at$createAction (0, modelActions);9 a! R" Y  Z  Y/ v" c+ \3 `
        " e5 x! d( [% ~. |# V) o# O- V
    return this;
! A' S% S4 G4 m( K  }
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