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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:
! `" G8 c# ?7 [  `: r3 e" O& F  @9 ^+ p/ ]+ X4 L) {
public Object buildActions () {1 H0 O; w: k) m- @) I; k
    super.buildActions();
0 f6 C9 S  F, s/ y    ) k# m6 V* g$ `, o7 V6 V
    // Create the list of simulation actions. We put these in
* v# R& S$ j7 z" v    // an action group, because we want these actions to be, C5 g- h# ?4 Z( E/ A
    // executed in a specific order, but these steps should
! F; t  U: a! G! ^+ |  ~, V# e    // take no (simulated) time. The M(foo) means "The message
6 b/ e$ g6 d: o: y    // called <foo>". You can send a message To a particular
: p7 T: K- {( `- _. ?$ R) M    // object, or ForEach object in a collection.8 q/ }; B- R& ]# F- Y5 I* D
        
$ A4 I/ M6 W" \7 G* B+ ]9 w3 ^0 T    // Note we update the heatspace in two phases: first run  p( ^& {$ U3 X/ K
    // diffusion, then run "updateWorld" to actually enact the. j- C( `5 ~# E* e$ _$ O
    // changes the heatbugs have made. The ordering here is
. T. O0 d( ]  V: B& p    // significant!
- u( {1 x, H4 Z6 O7 f5 U        
; k3 J: F& |+ E6 v: V( W    // Note also, that with the additional* W: T$ S2 T8 m
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
& U8 I" \$ j  G+ m# e    // randomize the order in which the bugs actually run
0 A5 @! V: n$ W, }* {    // their step rule.  This has the effect of removing any+ E- q6 Y; V* _- E2 V4 {
    // systematic bias in the iteration throught the heatbug+ p1 W: r* {8 ^0 Y5 `
    // list from timestep to timestep
& s; F4 E9 V" t* f1 S) w- `        
9 I# d; i! b' D    // By default, all `createActionForEach' modelActions have* s+ R& [: k) U  {% H! V  f6 }6 {
    // a default order of `Sequential', which means that the4 L# N" Q' e8 b2 }" e6 F! d' z9 v
    // order of iteration through the `heatbugList' will be0 N2 W# K9 Z2 w$ V: l8 ]
    // identical (assuming the list order is not changed5 [' k% N* P: Q" y% d' |  c
    // indirectly by some other process).9 ^8 ?! E* z1 @' w, D2 M. ?' g
   
% T9 l4 @8 T3 U4 p* s3 p    modelActions = new ActionGroupImpl (getZone ());
6 W, ?, ]. d, P1 |9 q  |
+ q) T8 q& T; L/ H    try {
3 D( m- T& O: J" U* M      modelActions.createActionTo$message
6 p8 N% ?0 \# o: Q3 a% w        (heat, new Selector (heat.getClass (), "stepRule", false));$ [" U0 W$ n% @  q2 V" d0 m: i6 [$ F
    } catch (Exception e) {
1 ]# `6 f% [" q$ r5 \3 ]/ V) `      System.err.println ("Exception stepRule: " + e.getMessage ());
$ Z# `& a; c2 @! Y: m4 Q    }: H* w7 ]+ c  \, F" E- v
1 ~( q. T: N1 l4 H% W5 }
    try {- y4 F! V- d# U. C0 O
      Heatbug proto = (Heatbug) heatbugList.get (0);4 x  s# I  H7 x8 j3 x
      Selector sel =
7 n6 R! v1 t4 n9 m" N% i        new Selector (proto.getClass (), "heatbugStep", false);- F# ~) _  o- ]2 C+ ?
      actionForEach =
) K2 K& a8 z' R( r        modelActions.createFActionForEachHomogeneous$call4 I+ s- x; K' X9 G' O5 o8 z* x" w
        (heatbugList,, R* H) O8 W  r  Z5 f- M
         new FCallImpl (this, proto, sel,, M/ K2 F2 g7 V" J' n
                        new FArgumentsImpl (this, sel)));
/ ]. m: H# [( b* U0 C    } catch (Exception e) {
7 R; e8 ?0 i3 ^" I9 s  a! {" [      e.printStackTrace (System.err);4 @" E* E: G* y  e1 I& {7 \  f3 y/ t
    }
/ N! f/ x# Q8 X8 I" `    8 y1 f3 N# G$ v, J$ ]
    syncUpdateOrder ();
2 m# @* k3 o5 L" s+ e# a9 j8 x0 s) m4 I5 B
    try {
; J* R% x# H' t/ ?* G. [8 ]5 M# \      modelActions.createActionTo$message
0 ^1 Z+ u; l# ^$ B) X) \        (heat, new Selector (heat.getClass (), "updateLattice", false));
& d5 Z; `2 s3 d7 M% j6 s1 g, \    } catch (Exception e) {$ x" W$ _( Y0 E+ Q
      System.err.println("Exception updateLattice: " + e.getMessage ());9 U6 K7 G) m: ^, F
    }5 v9 I! ~9 v% M
        
! L! {+ H( u; e# {: b$ X    // Then we create a schedule that executes the( u- \9 A% X  D. Q
    // modelActions. modelActions is an ActionGroup, by itself it' a/ Z+ b0 r! u5 f& G- X
    // has no notion of time. In order to have it executed in  H# a! O0 T* `- i# b8 C! M
    // time, we create a Schedule that says to use the# C* v0 m. F! ?3 }- G8 ?
    // modelActions ActionGroup at particular times.  This
1 y6 e: r) o/ A; G6 L    // schedule has a repeat interval of 1, it will loop every
2 M+ z2 }4 S2 `% H1 {    // time step.  The action is executed at time 0 relative to1 O$ m. F- U& l. t3 S4 a  N; U
    // the beginning of the loop.! ~3 P( `0 f$ Z) K
$ s3 e( d8 J1 j2 D) M1 N! {
    // This is a simple schedule, with only one action that is  J8 p" \1 o+ W+ y2 E
    // just repeated every time. See jmousetrap for more
; N4 O( O/ K( g9 z* ~$ |2 t    // complicated schedules.
( t2 w5 h  q0 H+ V/ R  7 D  J5 P$ g& C) X' O6 v
    modelSchedule = new ScheduleImpl (getZone (), 1);
7 W6 M" ]; k, D    modelSchedule.at$createAction (0, modelActions);- y9 E' A* q* n
        
$ H8 b4 ^0 c8 I; n0 P. m  ~4 S    return this;
# ^4 v0 X1 Q4 Y: s  }
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