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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:/ D7 a% t+ K- g1 i7 n

3 U( g- C" A7 M# @) d public Object buildActions () {
& z9 G; n5 `" f    super.buildActions();
3 j& M6 X" i5 i: [1 a    * |% h5 [( q$ \( Y/ H- e$ P
    // Create the list of simulation actions. We put these in
$ ]: A8 x' W: }% z    // an action group, because we want these actions to be
% p+ l/ k, H! \    // executed in a specific order, but these steps should+ D/ I3 F9 n% ?. W1 j) q1 ~
    // take no (simulated) time. The M(foo) means "The message
" ]; X! f6 l$ i  B8 {  v5 _    // called <foo>". You can send a message To a particular
7 O( V7 ^0 E# j; E5 V7 T! k    // object, or ForEach object in a collection.
$ @  |; c& ~, F+ o1 |1 y6 y        
: l6 k' x, v! {/ |% ^9 m8 r" j    // Note we update the heatspace in two phases: first run
/ c+ z; |( J  G+ |5 ]' B3 [    // diffusion, then run "updateWorld" to actually enact the
1 D5 g" F) ?+ D3 E- @2 n! d    // changes the heatbugs have made. The ordering here is( c' M0 G- e  E9 ]
    // significant!/ J  J3 ^5 ?6 F# E( q+ ~
        
1 k- F; D$ t: O9 C5 v) g! b) T    // Note also, that with the additional* ]- \8 s$ f; j" z. u
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
% Z+ y; f9 b9 _% \( I+ F9 j$ W    // randomize the order in which the bugs actually run
5 I; g7 y; G7 X1 \) Z; Z/ Y( a    // their step rule.  This has the effect of removing any: \3 N  I1 G( V: U
    // systematic bias in the iteration throught the heatbug! a+ Y! d  C3 \7 H
    // list from timestep to timestep$ f$ h3 P9 ?* E: i
        7 \  n. E( y3 M+ C; U3 ~; R
    // By default, all `createActionForEach' modelActions have; \! q! f4 I: {  o' |, ?
    // a default order of `Sequential', which means that the
% K* F6 \: T6 D5 n* Q. H# g    // order of iteration through the `heatbugList' will be8 S# _0 ]- Y0 T( u
    // identical (assuming the list order is not changed! ]* p5 `1 c, o& r* v
    // indirectly by some other process).
# c! ?6 T) e/ l! R  w: y2 [   
: \+ z4 N& ?0 P3 a' V; g8 E    modelActions = new ActionGroupImpl (getZone ());
$ `3 V5 A$ E. V' c4 ]
4 g0 @% Q* F6 h/ k$ `    try {, \) `0 X) f" \( G& O
      modelActions.createActionTo$message' v% E$ g/ C8 r8 b  q# q
        (heat, new Selector (heat.getClass (), "stepRule", false));
' n# k/ w4 ^- M/ Y! Y% W5 v    } catch (Exception e) {6 T7 o- p4 F" f' I; W# c
      System.err.println ("Exception stepRule: " + e.getMessage ());% r: F# R& N0 _, P7 t  z3 q
    }
- _) L) Q4 R3 a9 V  K" C4 f( \: M6 |9 z
    try {
8 U+ A- t' e2 N4 s0 w: a1 v      Heatbug proto = (Heatbug) heatbugList.get (0);
% A* g$ ]. b# f( W      Selector sel =
2 p% f7 w6 \3 o, u: X. u- B5 f        new Selector (proto.getClass (), "heatbugStep", false);
% m# H& o2 X: @/ a  i8 A      actionForEach =
# D  ~# d7 f, v: J/ h        modelActions.createFActionForEachHomogeneous$call. S6 f) @5 s: U9 K) V' @% G
        (heatbugList,
8 x4 l1 z" e  n$ K         new FCallImpl (this, proto, sel,
, E0 e/ p' C8 O! W                        new FArgumentsImpl (this, sel)));0 @$ U  n' E5 f4 c) |8 w
    } catch (Exception e) {. K, e! @- D4 H: f) b2 G, J- S
      e.printStackTrace (System.err);6 D  f; Z8 E# i- w8 Q" |8 q
    }2 t' C4 I+ V1 ]+ q2 O
    7 U9 i2 O, y( i: k
    syncUpdateOrder ();$ ^: V7 h$ T* t( A% a- l4 y: n

5 P" l. O7 K2 y0 Q1 Y    try {
9 T: V, e$ P$ T0 ~6 ^      modelActions.createActionTo$message , J. Q! ^  Q# x
        (heat, new Selector (heat.getClass (), "updateLattice", false));
) d  C) ^4 r: Y8 Z( R# F0 X% k    } catch (Exception e) {
! J3 |# \7 e: z      System.err.println("Exception updateLattice: " + e.getMessage ());
7 s  ?2 w: d3 P; f    }; v4 u3 [& z0 S' F) G3 R+ \* y
        : b" b; P" U; K
    // Then we create a schedule that executes the) r; }/ O% `1 @# Y$ q# v: s7 U
    // modelActions. modelActions is an ActionGroup, by itself it
. \. k: F/ i3 o    // has no notion of time. In order to have it executed in
" p3 f/ f3 U/ t  P& `/ m' ?  k) |    // time, we create a Schedule that says to use the& [: {; u. o5 N) ^3 y3 e5 o
    // modelActions ActionGroup at particular times.  This
4 r- S7 d& R1 x, h    // schedule has a repeat interval of 1, it will loop every
6 w+ I- U. V- `2 r% o    // time step.  The action is executed at time 0 relative to$ l1 \/ U1 i8 A9 f, @
    // the beginning of the loop.# l2 \6 r0 ^# A) v3 R

" A9 L0 R& Q- O! l    // This is a simple schedule, with only one action that is
6 z9 b1 l1 T! L2 C: A! |8 ]    // just repeated every time. See jmousetrap for more
% c9 {8 o5 {( v$ n* N    // complicated schedules.$ |* Y3 u0 Z: R
  
. _& h' ]) Z9 z& D* ]+ @& R1 l    modelSchedule = new ScheduleImpl (getZone (), 1);5 x4 z9 J. V1 `; L+ v4 ~
    modelSchedule.at$createAction (0, modelActions);
) V* C, _3 ]1 s$ P* p- C        
) f1 o. K% |4 T; o6 u    return this;$ \5 A9 b2 ?/ }" ]  R3 t3 k! f8 w
  }
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