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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:5 t! D* S* z: ~8 ]& u; K/ K0 h
. |5 t5 K' E, ~5 H
public Object buildActions () {* [4 b" s5 @9 o; a( T' S# Q
    super.buildActions();4 y3 t' ]+ z0 u; P7 ]
    - y# ?; O. h! r, \3 e/ G, P. K
    // Create the list of simulation actions. We put these in; S& U& a# l, d# L% Z0 r
    // an action group, because we want these actions to be' t# ?4 e$ J. W! ]3 a8 E. [
    // executed in a specific order, but these steps should% q& ^. q6 ^6 S% I6 E
    // take no (simulated) time. The M(foo) means "The message+ ~' ]* f/ F# [# E
    // called <foo>". You can send a message To a particular+ k, V2 J: N  c2 X  H" b) h2 e  d
    // object, or ForEach object in a collection.
  I3 ?1 l- r$ E        
! ~3 Z# P( R2 O( [    // Note we update the heatspace in two phases: first run* r. |5 o9 K* j5 W7 ~7 E
    // diffusion, then run "updateWorld" to actually enact the
$ a3 s8 d4 i% \- ?+ s( p    // changes the heatbugs have made. The ordering here is
# {0 e, \9 H% U8 o+ o, M0 \2 Q" A    // significant!
2 s1 q4 ]0 f7 J9 o  w) r4 ^        
$ w) ^5 T* W' H& |1 k- s- R% `    // Note also, that with the additional
1 V/ N! m2 C. g: H    // `randomizeHeatbugUpdateOrder' Boolean flag we can: Q; V  j& N, c; P8 t9 q6 Q
    // randomize the order in which the bugs actually run
3 q! I( Y4 d# N/ Q* i7 ^* _; m( ]    // their step rule.  This has the effect of removing any- m7 |1 `8 B' }+ d5 y* B
    // systematic bias in the iteration throught the heatbug8 k$ S0 |$ X4 z4 @9 {3 T
    // list from timestep to timestep
% j9 s3 s" M$ R5 ?        / K; O0 O) |: _$ j7 x" f; i5 @
    // By default, all `createActionForEach' modelActions have. Z4 N+ H8 C& E; z# c. Z
    // a default order of `Sequential', which means that the
# E  A( ^2 Q  u+ l# n& {    // order of iteration through the `heatbugList' will be5 H+ o* e7 d9 a* c
    // identical (assuming the list order is not changed
+ ^4 l+ l. p# @/ D" Q  J) N. l% F    // indirectly by some other process).3 ?& ^- o$ b4 Y) t
   
! |5 ^* b- a7 u% h; l  @% t    modelActions = new ActionGroupImpl (getZone ());
# ^. \7 @& Z% P1 V+ \8 F& |4 H! O& q* c4 L
    try {( \) q" ?+ ^9 X
      modelActions.createActionTo$message: B; C: x. @, D; L: M  N6 f5 z! ^
        (heat, new Selector (heat.getClass (), "stepRule", false));4 V" w' _2 J' Y$ i$ x
    } catch (Exception e) {$ l  R7 q9 ^* d! @
      System.err.println ("Exception stepRule: " + e.getMessage ());% i2 |  s0 k8 H( }
    }
: b6 G" Y% [9 J$ C& A/ G" o/ j* L' b
    try {
% C. _# F2 t, ~+ q; t* m      Heatbug proto = (Heatbug) heatbugList.get (0);
$ I5 U2 r8 U- n9 Z/ Q+ t4 q      Selector sel = 2 I; Q8 u- f8 r+ e
        new Selector (proto.getClass (), "heatbugStep", false);, i8 P% V; e3 ~7 h, U/ \! I' D7 P
      actionForEach =3 T+ ]+ @! B) z: |4 G
        modelActions.createFActionForEachHomogeneous$call- P3 i  U0 }9 t1 L1 w
        (heatbugList,3 k: b5 X- @5 m
         new FCallImpl (this, proto, sel,
( [( l2 [$ u2 d# g$ N- e( i                        new FArgumentsImpl (this, sel)));
* {' r9 |6 S; Q5 r0 P8 A/ j    } catch (Exception e) {6 M0 P. u; S5 V
      e.printStackTrace (System.err);
" h; I3 J4 S5 v4 r  S: `8 v& U    }
8 e) p$ W1 k: {3 p+ V   
2 I. Z( Y5 L9 H4 |: H/ @    syncUpdateOrder ();3 h* K" a8 c; E# l
9 x. ?8 v) H4 {/ v8 S: u
    try {# D: o0 ?4 h4 ^( K9 Z* O' w
      modelActions.createActionTo$message $ Q! g# t5 n" Z& v) A1 A6 X
        (heat, new Selector (heat.getClass (), "updateLattice", false));- f% U0 ^0 P# \/ \* S- _
    } catch (Exception e) {% n; h! A' P! V* ^# r7 G7 J4 Y- L
      System.err.println("Exception updateLattice: " + e.getMessage ());
5 M: F6 X! m4 z( |) B" _    }
" w# ]- Z  S7 D, P9 M* _. y: C        
! E! M: ^! _* P7 p1 ]  A2 i  j$ W    // Then we create a schedule that executes the
0 t" U' D9 X: j, }    // modelActions. modelActions is an ActionGroup, by itself it! W4 Q, ^1 |: E
    // has no notion of time. In order to have it executed in
4 C7 D4 ]4 |0 ?: s    // time, we create a Schedule that says to use the( O7 n9 K, I- o9 n3 {& x+ Z
    // modelActions ActionGroup at particular times.  This% `' C; g1 `; o4 V# S5 q
    // schedule has a repeat interval of 1, it will loop every. l; d1 _8 D7 J! c/ G" r
    // time step.  The action is executed at time 0 relative to
6 r7 J& q9 \: u0 `% j8 ^7 |    // the beginning of the loop.2 T2 [6 a8 H$ _

' u, b8 F9 x# ~$ k    // This is a simple schedule, with only one action that is: a" `, s  E% ^% o: V+ Z( Y7 q2 v2 X
    // just repeated every time. See jmousetrap for more
& s: |2 Y$ e2 D/ ~2 k    // complicated schedules.
. \2 G; e% w" Q1 V  # r5 f% i" O5 i
    modelSchedule = new ScheduleImpl (getZone (), 1);
3 W" E: @# U" V" u/ D0 U0 V    modelSchedule.at$createAction (0, modelActions);
* y$ {6 ?9 I' N8 ?        & l3 a! y( g% g2 y  x' R4 f6 a
    return this;9 y. l& y% k  H) d- e# m. s
  }
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