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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:
( l) x8 }3 @3 m" ]% X& ~0 W  f, u# M0 L. ^3 J- P, y% `; s* q
public Object buildActions () {
5 p0 v# L8 Q0 c9 L; S    super.buildActions();1 @* m7 O! _( A, ?# c7 P6 ?# e
    * O/ u! l9 j  t) T9 J
    // Create the list of simulation actions. We put these in
* x: S( `! }# H) S    // an action group, because we want these actions to be
; G: r6 D6 X$ O    // executed in a specific order, but these steps should; c& P& \1 d- `3 M$ l" ^( Y
    // take no (simulated) time. The M(foo) means "The message
( A# }+ i  v- ?0 k8 ?( r    // called <foo>". You can send a message To a particular
1 M0 o& a% {' v- \. k# Z    // object, or ForEach object in a collection.
4 Z- H" ]7 W  M# v, }        4 t$ }, I1 d& y& I$ I  J# L
    // Note we update the heatspace in two phases: first run) d( r! w" S5 q3 ?6 o* w: Z
    // diffusion, then run "updateWorld" to actually enact the/ B( Q' n; Z& J" u  ]+ M2 A9 M& C
    // changes the heatbugs have made. The ordering here is
- E0 W: Y9 O+ c$ W) C5 C    // significant!8 ]* u. i- L7 A) w
        & z; }# ~1 }3 }% G: B, t& w! p
    // Note also, that with the additional
* `9 g- D2 n4 \$ `    // `randomizeHeatbugUpdateOrder' Boolean flag we can
2 D, F2 w8 `$ M1 c7 Z2 J    // randomize the order in which the bugs actually run. Q* m, \  [: [2 Y2 H4 r7 E/ l
    // their step rule.  This has the effect of removing any
4 H4 U. Y7 m- y: p* o8 b  {    // systematic bias in the iteration throught the heatbug( \9 \$ B! ^4 V* y
    // list from timestep to timestep
5 G0 Y5 H0 \9 A6 v) u* l        4 N1 @& V4 ]; H1 }. D6 i5 |  N0 F
    // By default, all `createActionForEach' modelActions have% T7 T, b4 ^! _0 u8 C) K
    // a default order of `Sequential', which means that the( P! P# ~9 s7 J# j/ x3 V& k& V
    // order of iteration through the `heatbugList' will be# Z+ a6 G7 w$ M$ P
    // identical (assuming the list order is not changed
' ~. [' [% v$ B9 q6 H1 R& A    // indirectly by some other process).3 H. k+ B  U+ g$ ~6 k' t5 R, `
    2 \( j( L2 d) @* e
    modelActions = new ActionGroupImpl (getZone ());: v4 z0 a2 B' h" a, x
- p  L: n, p3 O
    try {
3 E1 q/ s, ]  U9 i1 z) O# \$ [      modelActions.createActionTo$message
; u$ C7 t" _' ^" {/ x9 K        (heat, new Selector (heat.getClass (), "stepRule", false));7 M3 v& z! `+ @8 h" W$ F
    } catch (Exception e) {
3 N% j* l$ b4 a) f& U2 w8 D& p      System.err.println ("Exception stepRule: " + e.getMessage ());" y+ ?) s) S4 P
    }# c" @6 d! I7 z" ^* X+ P
- K: j( h1 E+ B! A
    try {
2 q+ T; y; l' ?7 Z7 y% T0 ?      Heatbug proto = (Heatbug) heatbugList.get (0);
7 s0 `! x" _8 I' k/ F% w      Selector sel = - H' h, \; d( z; O! D8 Y& ?
        new Selector (proto.getClass (), "heatbugStep", false);' i4 ?5 o9 M  }) {8 E
      actionForEach =
7 z* Z$ t5 z  V. ?        modelActions.createFActionForEachHomogeneous$call" h, j$ ]0 U+ h8 ^
        (heatbugList,
' A% r1 v; N, v2 }         new FCallImpl (this, proto, sel,
  W, W; P/ e* ?( Z, v6 P7 |" |                        new FArgumentsImpl (this, sel)));
8 |1 A% J- y% l& O7 G    } catch (Exception e) {+ \3 A. h/ y' c" b- D  D
      e.printStackTrace (System.err);
& M7 Z3 e, U' A& @8 {7 p    }
" [. p+ z8 [2 Q   
3 U! h- N( z7 n    syncUpdateOrder ();
# T% o& k! i3 {6 Z, p9 w8 m1 T) W% i$ z! k" u9 Q
    try {, k7 |' p5 V; N6 U% F
      modelActions.createActionTo$message ( L' M, G6 |% s' ~% }2 D5 @6 d
        (heat, new Selector (heat.getClass (), "updateLattice", false));
, P; ]( I% k/ t: g. f1 ^    } catch (Exception e) {
9 Z, D& \$ J; b  P  K5 `      System.err.println("Exception updateLattice: " + e.getMessage ());& r9 D! _; i( K" |0 S
    }% E3 r: w2 L1 p7 ]- U' E( r3 m
        $ D$ U% T/ X6 X
    // Then we create a schedule that executes the
+ T7 {  T; R# r+ J+ P( V  }2 w    // modelActions. modelActions is an ActionGroup, by itself it
% A, g4 |; D" g# B. e    // has no notion of time. In order to have it executed in
) Y5 h5 e2 A! n" l/ l    // time, we create a Schedule that says to use the
! @; ^3 n1 F% r6 D    // modelActions ActionGroup at particular times.  This+ }6 Q  Y7 O5 V1 M3 H; S6 g
    // schedule has a repeat interval of 1, it will loop every
$ s$ ^$ z0 {  z) C    // time step.  The action is executed at time 0 relative to  W& s+ o# O9 d7 l
    // the beginning of the loop.
& P5 F, N" X5 w. m. v# a# J# H. A4 g  d
    // This is a simple schedule, with only one action that is$ l' f% \' j9 ]) S% h
    // just repeated every time. See jmousetrap for more2 z- ~* k* q& t* q5 H$ n5 ]
    // complicated schedules.+ ?& A' ~* t  w8 S- N
  % x8 B" n  Z% w
    modelSchedule = new ScheduleImpl (getZone (), 1);! g3 q% R& Y4 p+ c+ Y. d
    modelSchedule.at$createAction (0, modelActions);
/ f7 T! z8 m3 l% k' w        ! d) y3 e$ l  o. p& o
    return this;
% Z" _* S0 i: G: Y' |& e$ L0 l  }
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