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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 Y- x! G6 m  }2 W4 v* @
( F5 i1 I3 J* Y. z( u3 P
public Object buildActions () {5 j1 P: N  V6 i& z0 `4 {( c
    super.buildActions();, V0 [8 F- t' `; G8 T
    ( \& z# p- B6 P/ H7 U% g6 T
    // Create the list of simulation actions. We put these in
# c" _0 s/ E  n1 N- t2 V    // an action group, because we want these actions to be" `) D; W+ {* c$ {; m0 o$ N
    // executed in a specific order, but these steps should
; g1 m' }4 L2 S, B: Y    // take no (simulated) time. The M(foo) means "The message
1 C- Y+ g3 V+ c0 g+ @9 q' o    // called <foo>". You can send a message To a particular4 n  U5 X/ g7 B7 T
    // object, or ForEach object in a collection.. ^/ J- ?" N7 O/ |6 M1 v4 c
        
" T% [6 w( v# B/ S* G+ B    // Note we update the heatspace in two phases: first run
9 L9 G- M, Q# z6 G0 r+ i    // diffusion, then run "updateWorld" to actually enact the
& p' H1 I+ T% X4 _+ P& }( V% C9 g8 @2 M    // changes the heatbugs have made. The ordering here is! M7 X8 _7 W  M# {! w
    // significant!
" K# ?3 h" d+ a8 ~; |( V; H# t4 X        
! r5 o9 T. ]1 A) M& q9 V8 c    // Note also, that with the additional5 S/ H8 H  I: v
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
5 B0 P: i4 W9 y* C5 Z! o$ F% K& u    // randomize the order in which the bugs actually run
- f+ o1 U9 j2 C$ {) a; p' U9 L    // their step rule.  This has the effect of removing any
1 X2 R  m1 U/ K" ?; Z# h$ E, j    // systematic bias in the iteration throught the heatbug3 h$ X# I. I! W9 q$ O1 a! [
    // list from timestep to timestep
% |$ d/ J8 F: q        
% I2 E. T5 t; d& R    // By default, all `createActionForEach' modelActions have$ |) H8 P& l8 E
    // a default order of `Sequential', which means that the
; f7 f: S3 B- b    // order of iteration through the `heatbugList' will be) {& l+ [. C  O& N4 u/ K
    // identical (assuming the list order is not changed' V1 y2 E/ R3 [# R, z' H& P3 f
    // indirectly by some other process).+ {- J- X/ N, r: T+ U; a. V
   
4 [* I2 Y/ c& C0 |# T3 C+ c    modelActions = new ActionGroupImpl (getZone ());
" L  G. e# P- q* h; y% ?) F& ~4 _, a0 b6 r) }  G
    try {( ]8 l3 p  w* L9 n1 W7 |. w& n
      modelActions.createActionTo$message
0 e% l# ]6 ?% H        (heat, new Selector (heat.getClass (), "stepRule", false));: p; ]1 E( A  }1 Z  N
    } catch (Exception e) {6 y$ ?; W& R9 G  [" t$ H# {
      System.err.println ("Exception stepRule: " + e.getMessage ());8 D$ t) r* ?& O! ?) a# V' Z$ H' ^
    }5 m3 S5 x) c. c4 P$ m. s& I% L4 \: q

. z5 r. P1 R, C1 L    try {
. T. {1 ]% F' U" p+ I$ O0 g      Heatbug proto = (Heatbug) heatbugList.get (0);. S! B) g) q4 u
      Selector sel = " @8 ~# e; P5 r5 e$ b$ m
        new Selector (proto.getClass (), "heatbugStep", false);
  ^( \8 l0 Q  x( h- `5 h9 O. P      actionForEach =9 t9 \- @, [+ V7 g, W
        modelActions.createFActionForEachHomogeneous$call
/ k! q- ~' H+ w7 B/ E( v- Z8 V# n8 L        (heatbugList,
5 d9 f/ m, P( J4 [0 j0 J; m$ k         new FCallImpl (this, proto, sel,
. u1 [1 t/ v  N, Q0 C, g/ s                        new FArgumentsImpl (this, sel)));3 ]& I, l' W+ q: G5 p4 u2 V
    } catch (Exception e) {
: y* ?, V4 G+ s: d- G! K% P      e.printStackTrace (System.err);
  A8 {  p5 h% _' k( |3 h    }
5 i& S; b1 [1 L. I* Q4 a' d" {    , K8 n2 a/ d( L. m
    syncUpdateOrder ();) m9 a, ~2 K8 o7 m, e1 w) W
' O+ A! V' P: v4 F) n
    try {7 ?) x1 Z: ^$ A/ q: t  R" x
      modelActions.createActionTo$message " ?! k7 h; L: V( q8 N2 j
        (heat, new Selector (heat.getClass (), "updateLattice", false));
7 \* O( y6 n, E5 t' u5 ^    } catch (Exception e) {
; q8 Y5 n% C& j: F4 g9 i( K) e      System.err.println("Exception updateLattice: " + e.getMessage ());, h0 m& S6 u% ]# t
    }
8 E" V3 H3 \3 v- h/ N# y          \' \4 m4 g4 J" I" D  b! G
    // Then we create a schedule that executes the
/ R+ t' F7 ]; v* _/ S# l) P' g    // modelActions. modelActions is an ActionGroup, by itself it
$ u) W( D1 m  i, B% ~( n. ^5 A4 Q    // has no notion of time. In order to have it executed in* L2 ]$ u% |+ ?' `9 f/ [! p
    // time, we create a Schedule that says to use the
* f% m. ?( O+ {0 u6 |% E8 x" v3 _0 l    // modelActions ActionGroup at particular times.  This
& }- N7 _8 S7 l    // schedule has a repeat interval of 1, it will loop every3 g+ N* }* L" n0 o
    // time step.  The action is executed at time 0 relative to
/ j$ [& N2 ^8 _# I3 J    // the beginning of the loop.
  i# Q0 q3 e! |  C2 E. z! n
& O& P5 B; u" n1 p    // This is a simple schedule, with only one action that is
$ S( A- E* l! u0 a+ p. P4 O    // just repeated every time. See jmousetrap for more; u5 d% S/ G; }
    // complicated schedules.
9 |2 i5 l( x' s6 q( C" h  ; b5 n& z8 n* ]$ z5 ~* G' S
    modelSchedule = new ScheduleImpl (getZone (), 1);6 A( b2 x7 @7 O4 _! q* e3 N
    modelSchedule.at$createAction (0, modelActions);
, `/ E- j. o7 ^4 V1 |4 r        
3 z& `8 L, Q& L) R    return this;. [0 I- o* G5 ?$ g8 ~7 K
  }
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