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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:- w0 [1 `2 O7 M1 N1 u/ n! F
0 V0 R$ ~* z* ?- A3 S
public Object buildActions () {  a( j0 B! t" E, Z, ]% T/ h
    super.buildActions();% W9 R% a& I# ~% e; f
    7 ?2 E" `- w1 U2 a& G9 E, U
    // Create the list of simulation actions. We put these in, n8 h) E! p- r/ Y2 f& f
    // an action group, because we want these actions to be
! B) U: _: h; V8 D  p5 Y, p+ R    // executed in a specific order, but these steps should7 P' r8 y  V" {" B9 A6 S  D
    // take no (simulated) time. The M(foo) means "The message
+ r$ ]- _  F8 W' o% i9 M    // called <foo>". You can send a message To a particular8 Y% f. ?! v" x- H: m( b
    // object, or ForEach object in a collection.8 Y( [- g7 a0 E
        
  b9 g& D- b" p    // Note we update the heatspace in two phases: first run
# E: q! Q8 _6 T! [: n    // diffusion, then run "updateWorld" to actually enact the6 h2 G$ }4 S. M! `" Y3 \) C( g
    // changes the heatbugs have made. The ordering here is1 L  W8 b( m" g% D
    // significant!
/ f0 o2 P4 Z4 [* G0 ?* P9 C        : Y% y. o& ~5 [1 l  W7 H
    // Note also, that with the additional
2 ?: u( v8 w: i/ T2 W* K    // `randomizeHeatbugUpdateOrder' Boolean flag we can
  ^2 ?4 R' B/ @/ v    // randomize the order in which the bugs actually run; F' p" n. A4 n4 N9 L8 F" {
    // their step rule.  This has the effect of removing any
1 B: i  R1 R8 P! f8 z" S    // systematic bias in the iteration throught the heatbug
( d2 _. J1 I2 G, w    // list from timestep to timestep: Q  y8 V5 q1 {/ c1 W' w9 S
        
" }; @2 o& ^; X5 c  o! l    // By default, all `createActionForEach' modelActions have8 P' \4 M7 y, F2 w" D  r" D
    // a default order of `Sequential', which means that the! r8 r1 o- B4 k$ O1 A! m
    // order of iteration through the `heatbugList' will be
- I7 d, d: p* d! _    // identical (assuming the list order is not changed
1 q0 d" i. v  }+ z- r/ Z    // indirectly by some other process).7 c# c6 r! c- w3 g1 j# `4 H
   
6 U: o4 B+ A, }2 q; h1 Y" B7 _    modelActions = new ActionGroupImpl (getZone ());# l7 O2 N7 Q+ P

. B1 k! P, z% x1 D    try {0 U' U* f  ~+ l8 J4 t+ u% E+ g
      modelActions.createActionTo$message6 }6 K5 b7 r7 S4 R" h7 j
        (heat, new Selector (heat.getClass (), "stepRule", false));
5 P: B$ M8 p$ C' `% b    } catch (Exception e) {! w5 [; W! N9 G: l. i
      System.err.println ("Exception stepRule: " + e.getMessage ());! V" G+ }$ E3 }8 D6 @: t
    }8 ~8 `. U+ |0 c8 A+ U& ?

4 t; Y$ S1 v' Y5 V  f+ z2 T    try {
% f/ H9 P. Q7 f. s      Heatbug proto = (Heatbug) heatbugList.get (0);$ J/ N. Q' @; j: v! r2 E
      Selector sel = * X+ B$ f8 O* M3 ^
        new Selector (proto.getClass (), "heatbugStep", false);
, H0 ~; y# [6 @( x4 `5 W' ]      actionForEach =' H6 @; D: ?6 [& p0 y# J' h! O3 u
        modelActions.createFActionForEachHomogeneous$call4 R% n1 f# ~8 Y8 `
        (heatbugList,
$ ^4 _+ ?, w4 W1 K+ Q         new FCallImpl (this, proto, sel," d/ L' A: j) Q. U& G
                        new FArgumentsImpl (this, sel)));* M4 `7 l( t+ c
    } catch (Exception e) {* X3 M+ b" X. @; {
      e.printStackTrace (System.err);7 q+ X5 ?: V) n# |" c8 Z4 `
    }
% e. A5 d$ @5 s; w   
, `% m# N5 o. E) S- Q" D    syncUpdateOrder ();! @% s. U, }. d% q0 V* G0 C5 \

* g) H: z/ a3 G! M  H. H    try {; G8 s+ p- C: F
      modelActions.createActionTo$message
; v0 x  D! t3 I$ M        (heat, new Selector (heat.getClass (), "updateLattice", false));
$ q% h& C2 O0 G) j    } catch (Exception e) {
7 G: f% G3 u% `1 U% P+ k- T2 q      System.err.println("Exception updateLattice: " + e.getMessage ());
/ ]2 [  `" z2 X1 u& Q( Y- }5 l    }
. w& p# @% i9 J# I% I$ R- j        
; @* _( I& P+ ~# }. ?8 `% |7 g    // Then we create a schedule that executes the
  V' j: o5 K8 b# j* M/ \) t' F    // modelActions. modelActions is an ActionGroup, by itself it* |6 ~5 Q  y! y8 u6 `
    // has no notion of time. In order to have it executed in
: J, ~+ V  i& P    // time, we create a Schedule that says to use the
/ s' X# Z/ m' [1 J, r    // modelActions ActionGroup at particular times.  This
! n$ B! M" |' @    // schedule has a repeat interval of 1, it will loop every) B$ u! [. H. j1 L" t
    // time step.  The action is executed at time 0 relative to; k8 l" N2 \/ D& M( P; u) T
    // the beginning of the loop.: T: Y. k1 Z" y! A4 _+ F

  J' |" P2 c7 z    // This is a simple schedule, with only one action that is
5 N2 p9 j9 z+ o; ]  E: {    // just repeated every time. See jmousetrap for more3 t) ?$ q5 P+ b/ f7 @* P7 D
    // complicated schedules.6 l9 s# g( e* d) O) }
  + S3 @5 _7 [4 s$ T4 u! _
    modelSchedule = new ScheduleImpl (getZone (), 1);
! Y0 H8 k/ q( d* j- N# ]    modelSchedule.at$createAction (0, modelActions);
' ~; n, K1 B, `  V        
' {; O& U$ \: o9 F    return this;
8 c  ~, T: W& U5 b( C' M) N+ m/ A  }
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