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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:
& Q3 b# F* X4 p1 p0 \  p
" K: d( ~) D0 Q7 D3 Z public Object buildActions () {
: i, K2 t* O$ t    super.buildActions();7 D0 b$ y( j8 E& V
      i2 L6 O2 U9 I( e' G0 Z( C
    // Create the list of simulation actions. We put these in7 y: b& p- n' |5 ]2 L$ W
    // an action group, because we want these actions to be; C) m9 b3 O  G% y& ^' s# n, \
    // executed in a specific order, but these steps should6 b) _) h" h& k! x" d" {
    // take no (simulated) time. The M(foo) means "The message# w) A# H. m5 I/ a$ ?& A- `
    // called <foo>". You can send a message To a particular
& d9 Y! P$ n8 g, g    // object, or ForEach object in a collection.1 ?0 Q! M3 M# w% b0 J8 x
        ' @% M* o! W% u- K2 `2 o- H2 P
    // Note we update the heatspace in two phases: first run# X1 M6 w, `9 H, t. p# b( i
    // diffusion, then run "updateWorld" to actually enact the
/ d8 U+ U" {" Y' s( c    // changes the heatbugs have made. The ordering here is
6 z$ W1 D$ k& S3 j! i    // significant!
+ w: J  W. o- Y5 J/ ?        
5 x7 ~* X  Q1 X7 e" {& w    // Note also, that with the additional
' n8 q0 d7 e1 J& Q) Q# [    // `randomizeHeatbugUpdateOrder' Boolean flag we can% d. _# X% u( G0 i8 r
    // randomize the order in which the bugs actually run
/ u" v8 l$ F/ x3 l: u    // their step rule.  This has the effect of removing any
+ E& Z5 |1 K( Z: W- z4 f    // systematic bias in the iteration throught the heatbug
( t3 J8 d1 n; X3 [    // list from timestep to timestep
8 j- R, e0 f* {, u  {$ q7 ]2 J        - o# x) l! N6 m5 U3 J
    // By default, all `createActionForEach' modelActions have; Z8 |( \' c( m6 X& E
    // a default order of `Sequential', which means that the
' L0 _5 S2 Q& N  K% p( s; a, i    // order of iteration through the `heatbugList' will be) Y$ f7 n4 `: L! l' ?6 x
    // identical (assuming the list order is not changed
/ G# m+ G0 Z/ p# ]* b$ x    // indirectly by some other process).
  ~6 Z* H  U' L1 d+ h6 A- \. x    ( q2 Q/ q( W( V% {6 U: Z
    modelActions = new ActionGroupImpl (getZone ());
, l3 }$ i/ p- w/ g$ r
, G! u$ w' |% F! f3 Y    try {5 Y& X. U- d$ f6 Y5 A) J. s
      modelActions.createActionTo$message* m- z* R6 u* e' ]& s+ V
        (heat, new Selector (heat.getClass (), "stepRule", false));% k9 V8 Z8 Q9 n7 b
    } catch (Exception e) {
0 u3 B( M/ ?5 ]1 a      System.err.println ("Exception stepRule: " + e.getMessage ());' X, v; y2 h  I% j: _% e+ o
    }
  \! P- N  M% p7 C
) O5 V- Z* ]3 `    try {
* i% E, Y7 r- z( ]      Heatbug proto = (Heatbug) heatbugList.get (0);
* B: v# }8 @; z5 u. d      Selector sel = 0 F9 G, R) d' r6 G
        new Selector (proto.getClass (), "heatbugStep", false);
, ^9 e  S& d" t) Q( F$ C5 ^      actionForEach =0 E8 @0 I7 o! f
        modelActions.createFActionForEachHomogeneous$call
0 v) U& [3 s9 |$ o+ g3 Q        (heatbugList,
. s1 O# F" A7 L" }% B/ {" ~5 K         new FCallImpl (this, proto, sel,7 @7 h8 L, Y4 b0 M
                        new FArgumentsImpl (this, sel)));' f/ u( D7 `6 V& Y) |
    } catch (Exception e) {9 o) ?7 e' M  b: C& U: U
      e.printStackTrace (System.err);
& M2 }5 B% Y# J" p3 D" T    }9 J* |+ S8 a) f$ w) l8 l
   
( j0 Y& t; m) R3 \! d% Q# w    syncUpdateOrder ();
$ _; t, o, A# _" e  D! @- n
3 S7 w( t; S! b. |* [$ Q    try {
% l# e0 Z3 K# q' M  x! J) O! d      modelActions.createActionTo$message
. i1 U. p9 o) J/ y7 ~. j9 ~$ L6 b        (heat, new Selector (heat.getClass (), "updateLattice", false));8 |1 a6 d( `+ o/ P* e' E
    } catch (Exception e) {+ Z! |; L2 Z0 f
      System.err.println("Exception updateLattice: " + e.getMessage ());1 X' l# _7 O, g3 l' C" c# t" B% Z
    }6 e; I. S6 r+ B5 e0 G
        
, O( A1 X+ K7 B) s8 a( z5 E    // Then we create a schedule that executes the% y/ Z, ^6 q" d' v+ W1 K
    // modelActions. modelActions is an ActionGroup, by itself it9 {* Q% w1 \3 \$ C" W1 l3 n
    // has no notion of time. In order to have it executed in$ H! {* m: ~! f& L# x$ i7 U: ?6 l& x
    // time, we create a Schedule that says to use the7 f8 T; o1 \- B! T
    // modelActions ActionGroup at particular times.  This
: I) {# ]2 ]$ `. }    // schedule has a repeat interval of 1, it will loop every: c3 o/ Z0 J. E  r! b
    // time step.  The action is executed at time 0 relative to& u9 b( L2 U( ]
    // the beginning of the loop.
7 D- X2 n( X& @0 N5 V, ^# T( h$ d; D; R# c( y
    // This is a simple schedule, with only one action that is: V, Z* n: E) @, ?/ Q
    // just repeated every time. See jmousetrap for more4 \  M- m/ E5 [* p# S
    // complicated schedules.
$ o  h$ {1 b2 }/ L% ^) h0 r+ ~( a) r  ! w$ d, M# K! ?' @
    modelSchedule = new ScheduleImpl (getZone (), 1);( K0 i* X/ X0 L7 a1 o$ |7 {7 M5 T
    modelSchedule.at$createAction (0, modelActions);3 I' Q+ p: r, u( ^  E$ y
        
7 ~& i, j  R7 S" D7 k2 V( c    return this;7 \4 K6 x5 H1 g. U, }8 b
  }
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