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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:7 C+ Q* M9 u, P$ A

4 J7 A5 a7 Y" V8 X* ? public Object buildActions () {
( q' Y2 R1 ?( @- Y6 T; _5 \8 n    super.buildActions();4 h' [2 m, q% C8 c. F$ \# E6 T
    3 w$ n" A4 w9 }( L
    // Create the list of simulation actions. We put these in+ u9 ~. c9 }+ c5 W$ o* H4 o9 x
    // an action group, because we want these actions to be
7 L) k: N# G* n: Y    // executed in a specific order, but these steps should
" _; ~6 u) `( n9 b$ a( p5 `% E- R    // take no (simulated) time. The M(foo) means "The message/ G* k( _9 j8 z% M) u
    // called <foo>". You can send a message To a particular
1 M: n) {/ E: T! y( L    // object, or ForEach object in a collection.
% r5 _( g0 t( h9 n        
+ S5 r, j3 n$ C    // Note we update the heatspace in two phases: first run
0 m# m7 A+ b& N, [- ?; r    // diffusion, then run "updateWorld" to actually enact the; [1 M8 e$ O7 T7 ?1 K8 E( Q- d) _& J
    // changes the heatbugs have made. The ordering here is& |! H) `) `. H6 x2 |8 a. [, _' O
    // significant!9 D0 p, a/ T0 d( `4 ^9 D" g
        1 ]- S( J! w9 n0 z$ ~) s0 H
    // Note also, that with the additional
/ B# w9 n1 f: z: |/ L! r    // `randomizeHeatbugUpdateOrder' Boolean flag we can) {- |! @* _" o  M
    // randomize the order in which the bugs actually run
2 s* s: \3 d3 R# A9 L$ d( @+ c    // their step rule.  This has the effect of removing any
4 f& O4 `) {5 E! C! w" Y    // systematic bias in the iteration throught the heatbug" W; y' @( D- O! C- I/ C; Q
    // list from timestep to timestep5 z0 y# T9 ?/ F& R; g; S4 c
          y  ^9 k1 K# G+ I9 G
    // By default, all `createActionForEach' modelActions have
( ^5 r7 b" ^8 t% V! [3 g    // a default order of `Sequential', which means that the
/ k' q# D: I7 D7 }! m    // order of iteration through the `heatbugList' will be
/ Q7 ?' n# O2 @! b9 P2 A& h; O    // identical (assuming the list order is not changed: ?, T0 h/ W3 o6 c9 G
    // indirectly by some other process).
  L+ Y, Y. ?  X. c    9 f$ I: W- b: ]
    modelActions = new ActionGroupImpl (getZone ());- j0 x7 D. n+ D1 I6 |

+ }( q. g- ?. J# S# L. V" w; A4 z. L    try {
# q# P, N( Z$ e1 O; s1 a2 ^% ?      modelActions.createActionTo$message
" J. y8 g$ T" b0 _& k        (heat, new Selector (heat.getClass (), "stepRule", false));
  t6 x" n9 g+ _: `, o! q! M& h    } catch (Exception e) {+ A& }/ c: x. j3 ?4 |9 t' h! H: j! u
      System.err.println ("Exception stepRule: " + e.getMessage ());7 t% }8 ^" b6 k% x( Q" c/ F
    }
: D! [0 D: L5 H! y% h3 {1 T8 ^7 U, N$ `# e- L5 C
    try {/ i1 W5 C9 s  E" S$ X8 J
      Heatbug proto = (Heatbug) heatbugList.get (0);$ @( O- @5 j* I. v
      Selector sel =
  r9 X9 k# M) R8 i2 G1 \        new Selector (proto.getClass (), "heatbugStep", false);0 h7 ^6 {" T& ?: K7 \
      actionForEach =1 g$ l4 z6 N3 N' g; ]# W
        modelActions.createFActionForEachHomogeneous$call
4 v' c2 X2 k% Z* Y5 ]- B3 L        (heatbugList,
4 G" H) c1 ^* n8 C5 U* u         new FCallImpl (this, proto, sel,
9 P4 u1 }3 z8 f' M( ]7 |                        new FArgumentsImpl (this, sel)));
( h9 ~! c1 ]5 M    } catch (Exception e) {# _# ^: F* w/ a, `- y
      e.printStackTrace (System.err);
7 u+ {& ?% H( B) E) C    }! s1 y8 g' g9 o) z+ l
    ' ^+ d0 M* X/ r  G
    syncUpdateOrder ();. X* }& Z4 ^6 q% N. y- @

8 c3 d" Z1 |, b8 d4 {  M" n  @5 B. ]    try {& {* |$ T5 k. K* n
      modelActions.createActionTo$message . {' I- L2 }8 v# \
        (heat, new Selector (heat.getClass (), "updateLattice", false));5 t$ [0 D) Z6 I# J6 R, v
    } catch (Exception e) {
% e: b  ^! Z6 q8 W. p/ e      System.err.println("Exception updateLattice: " + e.getMessage ());
' H6 v% Q# ]& [1 l    }
. \) ^+ ~6 Z$ D+ S) m& K7 ?        9 O+ p. a# t$ B6 t7 A5 I
    // Then we create a schedule that executes the" C  F) p& a/ x: T2 [/ g2 M
    // modelActions. modelActions is an ActionGroup, by itself it
! Y2 T+ X/ f) c# x  J    // has no notion of time. In order to have it executed in
! @# ~: }& |6 k- B' Y1 k    // time, we create a Schedule that says to use the& p& y+ P' H3 [9 k
    // modelActions ActionGroup at particular times.  This. P) T: u( O) Z. s
    // schedule has a repeat interval of 1, it will loop every
" O! v- j5 a7 F7 g    // time step.  The action is executed at time 0 relative to) J: P; Z6 F- }" C0 }7 J
    // the beginning of the loop.
3 a: F) B0 ^% C! n# D5 ^- D
9 l3 x2 N2 b' j2 z5 x    // This is a simple schedule, with only one action that is
3 I( G+ F4 M! z8 E4 Y% M5 r    // just repeated every time. See jmousetrap for more
% Z' u4 l% e7 y    // complicated schedules.: ]- n; b: _5 P9 s6 c
  . T' w. L3 J6 Y2 ]
    modelSchedule = new ScheduleImpl (getZone (), 1);2 m1 P# E: z) r
    modelSchedule.at$createAction (0, modelActions);' y  }* k1 n% l1 Y+ q
        9 X6 @- ~! u) x/ E0 e8 W
    return this;
5 X7 S& }$ Q- B+ n- R& t  }
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