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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:" s8 m$ K' b, p# y8 o

; Y: e' K! g: @, b public Object buildActions () {
1 s  z* z2 d( A1 P' T    super.buildActions();3 r( a/ j3 g, }0 v% l/ ~: [
   
' G) d& d2 d% P1 J    // Create the list of simulation actions. We put these in
7 v: M) s( t0 L) W    // an action group, because we want these actions to be% ~, f1 S# G7 s# H
    // executed in a specific order, but these steps should
6 X7 V/ h$ I4 P1 s7 M, x1 X; G    // take no (simulated) time. The M(foo) means "The message
# v  p% h0 k) {5 {2 l    // called <foo>". You can send a message To a particular
0 O' V$ Y; h: g- A    // object, or ForEach object in a collection.' y* Y  f" k5 F8 @5 p
        
: E- X: Q, m% Q, G  _+ h8 H    // Note we update the heatspace in two phases: first run
4 ]. N, _/ f) d, G0 n) I) M    // diffusion, then run "updateWorld" to actually enact the
% ^  k; Y5 K: g" {4 L2 S    // changes the heatbugs have made. The ordering here is- {* a3 W: b+ ]  l* x. P' E: ]. I
    // significant!' ^) ]' I' H9 W# I5 O3 D
        3 R+ u, }; U9 ~8 N6 L. b
    // Note also, that with the additional
: [  d5 v, {# B* [: k+ X# q6 t    // `randomizeHeatbugUpdateOrder' Boolean flag we can+ T) }% c- s) E
    // randomize the order in which the bugs actually run
. ?8 f- E$ O1 e% K0 d& ^    // their step rule.  This has the effect of removing any
0 ]) U9 p, n9 w# P$ U. q4 S  }3 Z    // systematic bias in the iteration throught the heatbug
6 Z! }' N2 }! g    // list from timestep to timestep. g1 |! v; @7 H9 I
        0 Z7 X' D. A  Y& T
    // By default, all `createActionForEach' modelActions have* q) t* w- Y' d) t2 _
    // a default order of `Sequential', which means that the
4 k, q- m: _9 J/ ?( e    // order of iteration through the `heatbugList' will be. b' E4 b+ r0 X# b
    // identical (assuming the list order is not changed
; o2 b! Y* m. j3 ^  U: c    // indirectly by some other process).
8 B7 e* A% h# p, Z    ( w( E% ^/ l* j
    modelActions = new ActionGroupImpl (getZone ());5 \! [5 ?% Z/ V( U1 P0 f" @

7 ?; M4 D( |9 k- m6 Y$ z' r9 e* ~0 l    try {
6 U4 P' u+ W* l) o7 v      modelActions.createActionTo$message+ h1 y, o* {2 O8 ~; M$ B. `2 N! ]) |
        (heat, new Selector (heat.getClass (), "stepRule", false));9 s# m6 l0 M, ]9 D. N5 O
    } catch (Exception e) {
+ O! m7 s8 X2 [8 I" Q      System.err.println ("Exception stepRule: " + e.getMessage ());
1 P, j2 ]  ^4 w$ @5 s    }
, G: f& T1 b7 O# E! g# j: A  }2 i% `& a+ K
    try {" K. @1 o- v  W  l' G3 I7 ]8 W
      Heatbug proto = (Heatbug) heatbugList.get (0);* R6 b* X3 j2 {/ c
      Selector sel =
! [! }( K6 q- i0 D/ ^" U( C        new Selector (proto.getClass (), "heatbugStep", false);/ _' p; `4 L3 Z1 S; e/ r8 t/ K
      actionForEach =
1 e, C; m- |  ^6 s$ O0 V        modelActions.createFActionForEachHomogeneous$call( ?) s' b% [+ B  J: s0 |
        (heatbugList,
4 R. T( E% @& a! P         new FCallImpl (this, proto, sel,$ [0 j+ G2 x7 J# S( v! [) f
                        new FArgumentsImpl (this, sel)));
( g5 L7 `$ O) ]- n    } catch (Exception e) {
) _) f% r; {: g5 P" x5 C" E      e.printStackTrace (System.err);
9 F/ `4 Y% w6 c# o  r    }
" Y# f: m' _$ w5 s6 y& p: w; }    . V5 Z' |1 n: ]9 W$ m( i
    syncUpdateOrder ();3 O7 H4 G1 U7 @* H# Q
/ d; C7 u, ]0 e
    try {
7 ^& t( [) v  F7 [6 u% Y      modelActions.createActionTo$message / i8 `" ]9 X2 ?! I$ S
        (heat, new Selector (heat.getClass (), "updateLattice", false));) L8 K7 X' m% B
    } catch (Exception e) {2 ~! f9 f. F: X% g
      System.err.println("Exception updateLattice: " + e.getMessage ());9 L# M+ E5 J$ P6 E& {# _, U
    }' a8 a6 p" l7 s/ k
        . Y% N$ y' r! [6 O& y5 K" S
    // Then we create a schedule that executes the. Z# K8 T5 k9 \3 n; s2 k
    // modelActions. modelActions is an ActionGroup, by itself it
9 X9 Q- i6 T" G, l) H* l    // has no notion of time. In order to have it executed in% R# P) t: P& k; u$ P! N
    // time, we create a Schedule that says to use the
* i% o! n7 k2 J7 }& T( h4 x) _    // modelActions ActionGroup at particular times.  This
* Y# p9 S# J9 V" r3 P0 w    // schedule has a repeat interval of 1, it will loop every8 g1 k6 m# ?' g: m: Y  l" d/ t
    // time step.  The action is executed at time 0 relative to
# g# }9 \. l: f2 [8 V- j  s) E1 X& ~    // the beginning of the loop.
' Y; l7 O9 j3 j- j) }8 k. S& N! {1 ~1 I; i9 A( @. _( y
    // This is a simple schedule, with only one action that is- ?1 E  K6 ~  w/ X- e
    // just repeated every time. See jmousetrap for more
3 ]* R7 l2 S/ I# u% O% H& @# R    // complicated schedules.* s, U- f" ~; M8 @' L, Z+ [+ i
  * z' U5 J2 i$ m3 \5 A6 E
    modelSchedule = new ScheduleImpl (getZone (), 1);
5 |2 K! I$ W# K- E    modelSchedule.at$createAction (0, modelActions);
% T) L' M' Y& j        
; b: Q( x4 c& B/ ?3 y, W    return this;
/ v3 Y/ M) |: @; F! O9 O+ c  }
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