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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:
$ t1 S9 N) b( Y1 ]$ _. `, h0 R. y" }6 D' U5 M
public Object buildActions () {
' H9 F: }  b7 k% d& z/ L8 w    super.buildActions();* F; y) N7 Y1 z
    ) ^* s9 d, \7 k! r
    // Create the list of simulation actions. We put these in
) @) h5 r' u6 P0 m/ ]8 _$ x( M; h    // an action group, because we want these actions to be
& C  i5 M5 B% ?5 d: b* ^- f" n    // executed in a specific order, but these steps should
* W& S+ O4 `9 G4 D    // take no (simulated) time. The M(foo) means "The message$ u+ I7 j9 C' I+ T# k( s) T# X" s: A
    // called <foo>". You can send a message To a particular
# N0 s& F3 V6 |& R/ w$ Z2 w, p    // object, or ForEach object in a collection.
: l5 B% `2 n6 E/ G) |4 D) [        
; m" L6 Z" k) q, N6 l$ {8 m( y    // Note we update the heatspace in two phases: first run9 ]( d' G; Y9 i7 @/ U
    // diffusion, then run "updateWorld" to actually enact the8 l% T# X" d! |0 f
    // changes the heatbugs have made. The ordering here is
: ~( K7 d, p8 ^    // significant!
  u, ~$ L; X6 \7 a        9 b5 T- y$ l3 Z" A3 t
    // Note also, that with the additional' i/ B0 E8 F: e: W2 Y
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
% ]' J! ]+ i2 N+ C: N& }    // randomize the order in which the bugs actually run) s- u; l0 B$ c  q
    // their step rule.  This has the effect of removing any0 W. @8 K7 I# Y: J0 y3 r; O6 d
    // systematic bias in the iteration throught the heatbug
; J3 T. X! `* I8 x3 n    // list from timestep to timestep: D2 n: V. v! C4 {5 u
        2 i; c$ h& r' y  s8 r% [0 E
    // By default, all `createActionForEach' modelActions have% \, i+ ^2 Z* z' N" E; J/ s
    // a default order of `Sequential', which means that the) p7 p1 }/ {4 Z2 }/ h8 {
    // order of iteration through the `heatbugList' will be
. p/ e6 y" b  [- C- z& V/ K) K. \    // identical (assuming the list order is not changed
( D8 X- w* N3 i: l9 `, _; G" ^    // indirectly by some other process).# D! v. L* D3 s
    ' j/ p$ t! q8 l, Z$ U# A1 V) g
    modelActions = new ActionGroupImpl (getZone ());+ M  p! J# G% r1 W( G

6 V: ]7 M; i# w3 h# C    try {
8 q1 N! Y: d, R$ E! s& |6 ]      modelActions.createActionTo$message
! [4 ^9 H- u& K( E2 \        (heat, new Selector (heat.getClass (), "stepRule", false));/ h4 p8 ~" M7 f
    } catch (Exception e) {5 u! V* B0 v( D+ C4 f
      System.err.println ("Exception stepRule: " + e.getMessage ());
$ T- m! j$ K$ G# S1 t8 Y! m    }8 @! u/ t0 n6 f" Z/ I

$ X! `1 T' B% k# U# X    try {
& z. ~0 _  }! F7 g      Heatbug proto = (Heatbug) heatbugList.get (0);
. `% I  g4 \! D. ^4 a5 y' o, G; X5 P      Selector sel = % q0 ]% B. A. m  ^4 u: w0 S
        new Selector (proto.getClass (), "heatbugStep", false);
' P# V; M  q- L  u0 J5 Z  @      actionForEach =
& \- h) v- y  k! f" b5 J; S5 Q        modelActions.createFActionForEachHomogeneous$call
$ h3 f3 _. u( U. N        (heatbugList,6 E  y2 E! y9 }
         new FCallImpl (this, proto, sel,
3 s; d5 G& g( X( {* d- O, ^                        new FArgumentsImpl (this, sel)));+ }0 K' ?" x% |
    } catch (Exception e) {
( ?+ f' z* J5 F) R% V      e.printStackTrace (System.err);
* w3 |' v8 g  F- J2 V$ a9 s$ D    }
' F: U: B; M3 Q6 q6 E$ B: y    7 M# h: _/ c7 q6 L* w$ w+ ?. a6 \  j
    syncUpdateOrder ();6 Q! D* n# N7 `6 @5 v5 \& P$ C
% [( t7 S: U  T  k, `/ P
    try {! b# U+ W0 N  ?+ _
      modelActions.createActionTo$message 1 E0 `6 Y4 |7 ~% b' A" \& d) V7 m
        (heat, new Selector (heat.getClass (), "updateLattice", false));
' J4 @& a" I0 Q  Q3 S7 ^: d    } catch (Exception e) {
8 g7 l, r7 B. p) O      System.err.println("Exception updateLattice: " + e.getMessage ());# j% m+ J, k  k4 t+ N4 g" c
    }3 W) ?2 e  K8 S/ o: m8 ^
        ' c/ w9 I" O4 g: D3 P) W9 |
    // Then we create a schedule that executes the
6 c- `$ I4 Z8 @; D0 b    // modelActions. modelActions is an ActionGroup, by itself it
8 E" H4 W8 R8 K' N/ q    // has no notion of time. In order to have it executed in
" I, F* @' l! |; D    // time, we create a Schedule that says to use the! m$ I8 }* R$ @8 r  D6 A7 Y4 o
    // modelActions ActionGroup at particular times.  This8 V$ a3 U6 f7 y. U! m
    // schedule has a repeat interval of 1, it will loop every; A$ ~1 G" D# L7 |: C
    // time step.  The action is executed at time 0 relative to
* e5 g+ k& Z$ H" T    // the beginning of the loop.
$ I3 G- X; h6 [) D- I
$ A' x, X. |& S# u+ ^    // This is a simple schedule, with only one action that is
; ]6 k3 \) T1 S6 ^2 {: P    // just repeated every time. See jmousetrap for more% C+ d+ g8 k, C7 U
    // complicated schedules.- T& t- }% ]5 }& h. G8 P
  ( R2 n" p4 Q% L( K# k4 e& q; g, z
    modelSchedule = new ScheduleImpl (getZone (), 1);
" r2 p8 Z& \  I% R9 P2 c# O    modelSchedule.at$createAction (0, modelActions);
1 D$ x3 r$ I3 x4 r+ v* t. _0 H; c  w        ( s- }  s. F% P3 f" e
    return this;
2 o0 j0 Z! }% F) p4 @6 D) y, y  }
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