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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:
( D) `/ J7 t2 t* ]" c1 W) r* g" ^2 z$ s* }/ @
public Object buildActions () {
) g9 D: w, z8 @    super.buildActions();- A0 V" h5 k/ g; ~  R/ B) }
   
" q- w0 l' N& n. G% N# g5 j    // Create the list of simulation actions. We put these in
- }9 A2 S- \9 u% {6 p    // an action group, because we want these actions to be
& a% B1 _$ f3 ]/ _+ G3 E    // executed in a specific order, but these steps should# i2 X( [- }6 B% C
    // take no (simulated) time. The M(foo) means "The message
% n5 N) Q7 U* O9 `0 H  I  u5 H    // called <foo>". You can send a message To a particular
7 D  K" _& b% \9 l, _    // object, or ForEach object in a collection.& r0 w% J5 {1 [
        
) f5 Q+ x" b/ O, H& L    // Note we update the heatspace in two phases: first run
* u4 r. T- b0 Z* N' g1 P5 T    // diffusion, then run "updateWorld" to actually enact the
2 s+ E: m1 C( d) a    // changes the heatbugs have made. The ordering here is
- t% z( R6 B; Y" ^& b    // significant!3 Z1 Z. U: p( L4 M' _) v! Q
        
( F! W" T- C: g7 Y3 r    // Note also, that with the additional
& K2 T% y3 N6 ]5 D" u    // `randomizeHeatbugUpdateOrder' Boolean flag we can
8 r2 a: y8 v$ {" T; N3 t4 M    // randomize the order in which the bugs actually run
( o$ j0 [  x) {- e0 T& g" R) M0 g    // their step rule.  This has the effect of removing any# \( x1 |3 F0 H- E
    // systematic bias in the iteration throught the heatbug
. M, Q7 ]% f& L6 W2 o    // list from timestep to timestep
9 M' h& F. F0 ~& u        % M6 D$ @; p9 s- v" D
    // By default, all `createActionForEach' modelActions have+ L, s, p4 a7 ^  u9 ?) l
    // a default order of `Sequential', which means that the
4 A9 F- h9 |6 T7 C/ a    // order of iteration through the `heatbugList' will be
  A# L1 ^$ Z0 y    // identical (assuming the list order is not changed1 W9 w+ d$ f) |5 K( g! B
    // indirectly by some other process).
7 S7 \1 g) Z! Y" {. E5 ^    $ M' [9 {/ F: n4 e0 X
    modelActions = new ActionGroupImpl (getZone ());
# ~" z6 ?) W. o1 h! {2 Y) m7 I# k8 Y1 W& k
    try {
5 ^8 S/ |- t6 z+ o8 g- c      modelActions.createActionTo$message
' c' o" {7 M, P; `        (heat, new Selector (heat.getClass (), "stepRule", false));: O* x* f7 L! B% h/ y
    } catch (Exception e) {
6 }, w$ Z. k/ y7 V" L) v1 Y* Y8 ?3 y      System.err.println ("Exception stepRule: " + e.getMessage ());
" M8 f* k6 x1 E3 W    }
. `4 R& T$ K8 Q( G! x' H3 _, F3 n1 N7 v9 G
    try {
& ~3 t- _) t/ [      Heatbug proto = (Heatbug) heatbugList.get (0);
# ?! z! G. k& q: u      Selector sel = & I+ w5 {/ h/ l; J9 f$ o' u8 p
        new Selector (proto.getClass (), "heatbugStep", false);3 {+ I5 S- l% E1 t2 F3 a
      actionForEach =+ k% h6 A, ?9 E3 S' }% ?
        modelActions.createFActionForEachHomogeneous$call
: [, o6 N( p" D3 b0 w/ u5 `        (heatbugList,# o* {8 H5 F& _% |$ k$ r1 [
         new FCallImpl (this, proto, sel,0 h& @# D4 F  l$ X( F: B
                        new FArgumentsImpl (this, sel)));
- i& w& y9 |4 c- V9 W    } catch (Exception e) {0 y- R% h+ `, U9 Z/ P) r) |- r
      e.printStackTrace (System.err);
& i4 }* c( L- c$ u0 {5 |3 h" ~    }0 h. W) b8 Y% M5 }; {
    ! P$ |! r0 v6 Z9 m
    syncUpdateOrder ();, ]/ c- w2 i1 [5 D7 }- U; ^9 _- y
* |/ F, C! V1 ~$ I$ |9 R: [
    try {. r6 i2 W* Y, _, G/ L: k
      modelActions.createActionTo$message
; @5 V( L- K7 x8 n: y        (heat, new Selector (heat.getClass (), "updateLattice", false));
* S3 i; ~- l1 e: ]$ e: e+ H    } catch (Exception e) {
' I  \3 \6 H/ e7 Q4 d( v) y3 Z/ @      System.err.println("Exception updateLattice: " + e.getMessage ());$ z; k6 r6 X6 d% g# N, @1 W7 B# i
    }
; u  s- F3 n0 m) T& W- y% P        
  U: Z1 s9 j( c$ h, }- d1 ]- K7 B    // Then we create a schedule that executes the8 u2 ~! R' N$ k& r; g
    // modelActions. modelActions is an ActionGroup, by itself it
' z; M, K1 N1 z; d" D    // has no notion of time. In order to have it executed in7 j  n; H, {4 ]. a4 g. F& Q$ F
    // time, we create a Schedule that says to use the
( ^" l. W5 X% b/ ?* @5 u    // modelActions ActionGroup at particular times.  This: `, D9 B, o: L9 _. m* X9 o, G
    // schedule has a repeat interval of 1, it will loop every
* `% f3 v) g% l    // time step.  The action is executed at time 0 relative to# e6 k4 F, R1 R, u/ r# E8 R
    // the beginning of the loop.% a$ R1 }+ F  E  ~( @3 H# L6 s

) c1 J4 J' m6 o3 y1 u5 X    // This is a simple schedule, with only one action that is
/ z, R$ s. t- E    // just repeated every time. See jmousetrap for more4 F1 }! d6 a6 i& i8 _, P
    // complicated schedules.: I) m# }+ B! V* C2 \
  
1 h9 M3 z, t" o9 a' j, b    modelSchedule = new ScheduleImpl (getZone (), 1);
8 f  x/ Z' {3 R% G, D' m    modelSchedule.at$createAction (0, modelActions);
1 A" h1 X/ g& `3 e: Y" |        6 [2 J. m) ^3 M0 K
    return this;
# S. q1 Y4 i, J% K3 A  }
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