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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:: ~) r. r% V5 }, F& a# m  I3 e

' U  ^6 h& K: G8 {+ Q1 }3 R public Object buildActions () {' e. s8 ^7 x: O3 Z
    super.buildActions();
% u0 t8 e/ X, d* u    5 E3 T) q/ |! R# |
    // Create the list of simulation actions. We put these in
8 [( H& a2 f# r: I2 U3 s+ R    // an action group, because we want these actions to be
1 j* k2 _" R+ M" s- h    // executed in a specific order, but these steps should
, J) K2 {/ X' @3 Z3 I6 [$ t0 [    // take no (simulated) time. The M(foo) means "The message
* z: @* Y1 h) X  r$ i6 V0 {    // called <foo>". You can send a message To a particular5 f$ k5 Z* M) L  ]. X0 v
    // object, or ForEach object in a collection.- [# |" G8 b! R8 D
        2 I  X6 ?' {, T0 ^
    // Note we update the heatspace in two phases: first run' f' p+ c3 t; _# |) j  E* _
    // diffusion, then run "updateWorld" to actually enact the
+ P  L) p( j( K6 w    // changes the heatbugs have made. The ordering here is) Q" y5 Y& P, _2 A8 h! ^# ?9 v
    // significant!
0 }) F: q; n+ R3 {9 X/ H( C/ o% l        # r) c% s/ \0 N- E  b
    // Note also, that with the additional! e3 c8 @$ ]- }7 A6 l5 }
    // `randomizeHeatbugUpdateOrder' Boolean flag we can/ |* z$ w& y1 j! L  Y
    // randomize the order in which the bugs actually run% o8 E1 L5 {4 u) P5 l: T# R
    // their step rule.  This has the effect of removing any: Y; ^, H" ^+ _6 [, W3 U$ l
    // systematic bias in the iteration throught the heatbug2 d& k& w& S3 g' [2 H" e/ k
    // list from timestep to timestep
3 e8 {* @: u5 o* z) `; |        
+ f4 q* x6 ?. X; E    // By default, all `createActionForEach' modelActions have0 I, m9 |! M; o  Q1 h6 t
    // a default order of `Sequential', which means that the$ R/ p# {) |' b; y" M3 B, R
    // order of iteration through the `heatbugList' will be' A( h: ?. _3 V% [$ @
    // identical (assuming the list order is not changed
% k3 k! E( r0 b7 p1 A* ~    // indirectly by some other process).! j& X  @& V3 f6 r* \& @
   
3 K4 v0 Y% X2 `$ @  D0 u3 n    modelActions = new ActionGroupImpl (getZone ());
) Z5 k! G4 ]8 {+ }) c; l# P) r! c. b/ p, K' k; ]
    try {. _$ o0 i) C7 k
      modelActions.createActionTo$message
7 S' k6 V, x( q8 q  Y8 W        (heat, new Selector (heat.getClass (), "stepRule", false));
6 s- _# K7 e# e# p  B6 `  w    } catch (Exception e) {
- n6 A. R+ L) m' X" ^      System.err.println ("Exception stepRule: " + e.getMessage ());- v$ z2 y& r3 l: b) R
    }+ k3 v" M7 @- }) k- q

4 i3 [1 R- w3 p2 Y    try {2 g- F9 L) v  m9 h* K
      Heatbug proto = (Heatbug) heatbugList.get (0);) X$ d5 p" [0 n, X1 B! d
      Selector sel = . Y1 ^- m! t) }* o/ U+ k: w; H
        new Selector (proto.getClass (), "heatbugStep", false);
1 A. Z; i( M8 V' p      actionForEach =
9 c5 n$ C/ s( @5 p& j. f% @        modelActions.createFActionForEachHomogeneous$call
# f1 m9 H7 l' Q: i. o        (heatbugList,5 Y6 q5 o; X' P  d/ s' ^
         new FCallImpl (this, proto, sel,
& p. Z5 b3 H( A2 r                        new FArgumentsImpl (this, sel)));
3 T! z3 D7 Q+ O+ h+ d( r/ H    } catch (Exception e) {5 U. ]9 ^$ ]( _+ s- D+ h; W
      e.printStackTrace (System.err);9 c2 k# E- R7 C0 _: M" c: b
    }- w% F5 a, B' f/ \7 c6 B
   
8 @  U' H2 N, |    syncUpdateOrder ();+ _9 F! |+ m6 f* Z

- d8 Z1 o  E( Y" u. O    try {
% p0 C! Q4 A+ N6 @. ^1 y      modelActions.createActionTo$message
3 P3 l# A* b0 m4 j7 ^( M5 m/ f        (heat, new Selector (heat.getClass (), "updateLattice", false));4 L3 H6 n0 V+ J6 n
    } catch (Exception e) {
* l* L& c$ Q% L+ @      System.err.println("Exception updateLattice: " + e.getMessage ());
$ M) i- L' p* X9 ~    }+ f7 ]4 c% D: U3 E' k9 F+ W0 Y
        
4 z+ o7 A6 q+ a2 p6 F  ^1 F+ A    // Then we create a schedule that executes the
3 }- d- K7 H/ Q3 z6 b: T: ?5 r    // modelActions. modelActions is an ActionGroup, by itself it
9 V2 ~8 X% ], }( N. w" ^* J# R$ j6 }    // has no notion of time. In order to have it executed in
' U8 J  I7 [* r" X! n    // time, we create a Schedule that says to use the2 m/ P  `4 L& |9 x1 z$ H; y
    // modelActions ActionGroup at particular times.  This3 x) Z! C6 b8 h+ }5 k& Y7 y
    // schedule has a repeat interval of 1, it will loop every( n! j+ |" V/ S
    // time step.  The action is executed at time 0 relative to; z+ D! X. M& v! _
    // the beginning of the loop.
( |6 |% ^7 p9 R5 x2 A. Q/ ?; X+ l' y5 X6 b1 A9 [( W
    // This is a simple schedule, with only one action that is
1 _$ ~, ^% C  e4 T1 C# A3 I    // just repeated every time. See jmousetrap for more! F; [. ^: n8 c1 C6 Z  a+ I+ a
    // complicated schedules.8 Q  ^. z9 P+ |9 a
  # A+ K, |" K" |: l& c- L( L; C
    modelSchedule = new ScheduleImpl (getZone (), 1);- u% f' Z. v8 Z; h7 i6 R
    modelSchedule.at$createAction (0, modelActions);1 ^2 M$ s1 ~6 [
        ( x* _: H0 o# J
    return this;2 x& ]2 P  B# }8 ?: t
  }
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