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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:
( T3 Q" l# W1 Q' U5 O9 m7 Y5 r. l+ b: V) f" K
public Object buildActions () {
# t- @1 ]. t" J- F: U    super.buildActions();
* A/ _* j3 ^0 P) H    * M# X, ~& L' g: A9 l) Y9 }3 y
    // Create the list of simulation actions. We put these in2 w  Q+ k+ h  A( \. P4 O
    // an action group, because we want these actions to be
1 {9 `) c$ }& C9 p5 N    // executed in a specific order, but these steps should4 q: F, S" b/ p- }3 A3 p
    // take no (simulated) time. The M(foo) means "The message9 ^6 z, x2 \$ w& y) G& z
    // called <foo>". You can send a message To a particular
5 p/ E0 B' t3 P, M5 L    // object, or ForEach object in a collection.
3 t& _: B( d7 o" M$ c! I4 e" F        . R+ g$ G# T( e" [+ E
    // Note we update the heatspace in two phases: first run# M+ N" W' f8 E5 i+ k! d$ e" L) B
    // diffusion, then run "updateWorld" to actually enact the
4 q! n! h* Z7 C9 P- m    // changes the heatbugs have made. The ordering here is% c5 B3 p7 D% t2 x9 L
    // significant!
* r: j7 a; }* M  _6 E. o; Y        - n3 S2 h/ P- u+ z% D8 ~+ [
    // Note also, that with the additional  {4 B! _4 p+ i* e3 u1 q8 o- ^
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
+ o) F! Y2 c" z0 g( F: `! z, p    // randomize the order in which the bugs actually run
, i, E& R+ Q. P! M' J  @    // their step rule.  This has the effect of removing any2 j& Y0 ^! |9 t( ]9 f# A1 X
    // systematic bias in the iteration throught the heatbug1 l* v* ], H  A6 q; y" o2 ~
    // list from timestep to timestep
+ V8 v$ q. {  n9 k        
2 u- Z9 T3 b* A& t' K0 v    // By default, all `createActionForEach' modelActions have5 j  E9 N( O1 b- y
    // a default order of `Sequential', which means that the
8 t8 M: _. q" M: [# F    // order of iteration through the `heatbugList' will be$ M( V% e( t+ q( L! ^
    // identical (assuming the list order is not changed8 h1 @) Q# m3 ~) s
    // indirectly by some other process).
5 d# @4 a" e! U8 ~2 [: S    . v) z2 S. i+ B6 V
    modelActions = new ActionGroupImpl (getZone ());
7 Q$ r# I- p! L) f
5 W- m' N( O' [1 v  b    try {; c, \( a. h7 ^$ v+ v
      modelActions.createActionTo$message  j2 V5 }. q5 C$ o) f8 q0 R
        (heat, new Selector (heat.getClass (), "stepRule", false));' e5 E: l, r' H( z) c
    } catch (Exception e) {6 J. ^% d7 r5 Y9 j
      System.err.println ("Exception stepRule: " + e.getMessage ());
  t: @0 @5 N5 U0 }! D    }) X: a0 A  i9 n
' X% E% ?4 |) ^, ?
    try {
  e7 Y7 ~* V- b1 J. {: k/ o      Heatbug proto = (Heatbug) heatbugList.get (0);
7 O$ B, f) R* k" R      Selector sel = & k; w4 x# T! M% i5 i
        new Selector (proto.getClass (), "heatbugStep", false);
# t# }! X! C2 }; k      actionForEach =7 k$ G1 z: E" G9 q! }0 a; r3 S; q
        modelActions.createFActionForEachHomogeneous$call
" y& E& N- ^) {. D. ?        (heatbugList,
3 G, w$ D) ]8 s  X         new FCallImpl (this, proto, sel,$ W3 ?6 B  `+ C4 I' t0 v5 v
                        new FArgumentsImpl (this, sel)));
9 B' n2 g3 ~9 K) y5 P# G    } catch (Exception e) {% p- S" W0 h- K- g1 g. Q, D
      e.printStackTrace (System.err);! ^5 g$ g5 D/ X  N
    }4 t$ `. Q9 s1 `
    ! h9 T" k/ u2 S  g. w, Z
    syncUpdateOrder ();
. K3 _( b0 o( C% t# L  {( r$ N4 j  g, s* M2 k2 E
    try {
! }" y& a: c% P. i5 H0 ^/ s      modelActions.createActionTo$message . ?$ o! E( g* @, A. X# ?& G' C
        (heat, new Selector (heat.getClass (), "updateLattice", false));
  q0 \; }' L+ t" k$ q* m' }: |4 U    } catch (Exception e) {
/ o3 ~  d) k0 H0 b      System.err.println("Exception updateLattice: " + e.getMessage ());$ ~; d3 h2 Y! d8 k; @
    }
1 t" P' K9 k6 ?7 ~' C. c* {. E        
1 @" F+ v0 e2 u% V    // Then we create a schedule that executes the
6 s) ?# c* u3 N! }- T' i    // modelActions. modelActions is an ActionGroup, by itself it5 @2 o7 n- o9 F- }" f3 [  C
    // has no notion of time. In order to have it executed in$ Y2 i& D4 X, m- ?7 {2 h
    // time, we create a Schedule that says to use the
6 P$ v, P7 C" W( B! }    // modelActions ActionGroup at particular times.  This
9 m5 l! n: q9 s3 F, F) k6 l' C    // schedule has a repeat interval of 1, it will loop every
) @0 Y+ r. e1 {2 q' F! f    // time step.  The action is executed at time 0 relative to
- e% X/ k+ J& B    // the beginning of the loop.9 Q0 o& d1 H( M

: g* ]: x0 H3 h. Y7 Y    // This is a simple schedule, with only one action that is
2 o: w- q. O$ j0 H. W    // just repeated every time. See jmousetrap for more  e& u$ [/ h/ g* `. f+ J
    // complicated schedules.
: v& X! t% l" R. @9 ^9 @  w  
( W1 a3 T* z4 U    modelSchedule = new ScheduleImpl (getZone (), 1);& V3 x# y, I' Y! ^- k$ V4 {/ S
    modelSchedule.at$createAction (0, modelActions);+ x  N$ g9 U  H4 F' }6 I" b
        
5 K2 H- f) f8 ]/ m2 E    return this;! y& g" z4 e5 ^+ d+ B5 h
  }
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