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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:
/ l4 g& q$ A3 q9 H3 a
$ W& l/ b/ O6 a public Object buildActions () {6 d2 Z  v+ M0 F8 K0 X
    super.buildActions();$ k; h8 }8 W) l; @
   
5 @4 k0 s; _" f3 B6 t, T- h    // Create the list of simulation actions. We put these in* H$ I% K' A# L3 N0 x. F2 o
    // an action group, because we want these actions to be
+ ]4 |% E' v0 I% \  i    // executed in a specific order, but these steps should8 [: I' _7 K4 R- \: m
    // take no (simulated) time. The M(foo) means "The message
  H5 O1 s5 y4 Q- P. K; \/ @5 [+ u$ b    // called <foo>". You can send a message To a particular
" g1 Y, D2 C* ]/ U4 c6 _: k) }2 l1 ~    // object, or ForEach object in a collection.
  g; e9 D# J" Q2 X        
( ?0 Z0 W/ n! k$ k    // Note we update the heatspace in two phases: first run
' |; K% X6 E/ H    // diffusion, then run "updateWorld" to actually enact the: l+ a; a6 R* r" G
    // changes the heatbugs have made. The ordering here is
; O0 y7 k0 w& o# D( j4 ]: Q    // significant!5 P" i: E6 {" F3 D$ c
        5 a, `- `4 H5 A% e4 I, j
    // Note also, that with the additional. t/ z! W7 _1 u$ V5 Q" h. y9 y
    // `randomizeHeatbugUpdateOrder' Boolean flag we can, F- P! E3 c# r+ w  F
    // randomize the order in which the bugs actually run5 t- R! M7 s* m5 L6 D
    // their step rule.  This has the effect of removing any, F0 l( N5 h5 r- |' v3 G% ^3 q
    // systematic bias in the iteration throught the heatbug
" Y3 x# B7 i3 q( O0 J0 `3 A$ }- O    // list from timestep to timestep" D6 h; n' I8 g; V1 D0 Y/ l0 a
        5 N$ c, |( j0 H. [9 o2 D+ x7 P
    // By default, all `createActionForEach' modelActions have
/ q2 S8 |1 ]: X5 X( \" H2 L    // a default order of `Sequential', which means that the
3 p5 u: y" r8 o1 C& X8 \# y    // order of iteration through the `heatbugList' will be
0 U% R! H; Y, y8 A9 F7 c    // identical (assuming the list order is not changed
: Y2 E7 R0 V; T    // indirectly by some other process).
( p& t* K# F  \" G! J, _   
: r7 F' V0 O2 c$ v    modelActions = new ActionGroupImpl (getZone ());
) a# ^/ j8 U2 j; W: m& h6 t
8 {; f0 w8 M# w9 U! M' J    try {
7 C- e* T  a/ T2 M- u" J; X4 P      modelActions.createActionTo$message5 Q5 n  i4 S# k9 y0 s$ M1 `
        (heat, new Selector (heat.getClass (), "stepRule", false));0 f5 T8 g4 o2 |: x: }1 l
    } catch (Exception e) {  @  c  k0 d5 r6 C( S) t
      System.err.println ("Exception stepRule: " + e.getMessage ());' k' ^0 f! ?; W% m( u$ g
    }
( Y6 x3 }) B9 B9 S% T, r
& L3 R7 p& t2 k% T( _    try {$ x2 M: o! _+ w
      Heatbug proto = (Heatbug) heatbugList.get (0);4 p# `; P  u; R( Z- @( R: Q: s' w
      Selector sel = ; H$ {8 ?, |8 o* L7 p: M
        new Selector (proto.getClass (), "heatbugStep", false);% q- q! i, t7 Q1 @- @9 M) D$ x, E/ Z
      actionForEach =
: ~7 A8 W8 t, a1 U        modelActions.createFActionForEachHomogeneous$call
, M- _( L+ Z1 x) J3 J* o6 p        (heatbugList,
, U# P. ?& e: d5 f) o, H* I0 f3 Q         new FCallImpl (this, proto, sel,- c( B5 ^9 C" A% ?% i$ B
                        new FArgumentsImpl (this, sel)));) o4 w% A3 M' _1 v" A5 Q+ T) p: y
    } catch (Exception e) {3 b  Z" {! e+ P, ~+ [
      e.printStackTrace (System.err);
, X% l% }/ r- m7 a% t; }    }
/ q! K9 i8 ~: c' ?   
$ g" \& X  M% M+ c# f$ O    syncUpdateOrder ();
! q$ L9 B' r4 V$ s$ |  r4 f4 C2 B+ E9 g# o/ w) D: p4 S  F: F
    try {, m% h: ~2 D- Y  x9 B
      modelActions.createActionTo$message
6 u# x9 z9 Y* V5 Z. b( d9 ?        (heat, new Selector (heat.getClass (), "updateLattice", false));4 I& f. d& V7 k- r3 [* Q% K
    } catch (Exception e) {
8 `( y9 Z8 C1 d# U2 {, ]( ?      System.err.println("Exception updateLattice: " + e.getMessage ());/ K1 @" ~" O8 i/ Q
    }! {2 `1 H: ]+ @
        
5 _& w2 l# K4 a: A" f5 B+ d. r    // Then we create a schedule that executes the
. G2 ^7 h1 C& A0 n* r$ m    // modelActions. modelActions is an ActionGroup, by itself it
. r" m6 E/ j' ?  [5 p# b7 Z) h    // has no notion of time. In order to have it executed in
/ S+ h) g9 ~0 S( O, \    // time, we create a Schedule that says to use the
4 S. j: N4 V" J: M' l    // modelActions ActionGroup at particular times.  This
" E5 F- b* u  |    // schedule has a repeat interval of 1, it will loop every
5 a0 m( w3 G8 s/ F; {; W5 E    // time step.  The action is executed at time 0 relative to
# A. \5 M- t3 d, C% q    // the beginning of the loop.
/ w) v) }+ b" j
0 a/ Q6 H4 ?$ Q& E    // This is a simple schedule, with only one action that is* U0 D3 V* |* X' ]
    // just repeated every time. See jmousetrap for more7 ]7 u( ?& C  P' A, K
    // complicated schedules.5 @: C1 p. f! O. n5 l* a  [
  9 C9 N+ s2 T! H6 ?6 @( R9 }! A
    modelSchedule = new ScheduleImpl (getZone (), 1);! j# M# ^# o' r! P5 B
    modelSchedule.at$createAction (0, modelActions);
) Q, ^6 |' z) X5 o! K$ ~/ N        
4 M9 r7 d* @5 h3 o2 j7 ~$ ^8 h    return this;# N2 Q$ G# n2 R; s& s7 u0 \7 G& c
  }
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