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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:3 @4 A/ @' z1 o' l( m6 z

$ _& F2 F* F8 m4 d public Object buildActions () {
% D8 R/ w3 ], K; Y* y    super.buildActions();; `* B; P/ n! I0 p. U; K7 P
   
4 |$ V8 C6 \6 X" ~6 X1 r    // Create the list of simulation actions. We put these in1 `7 O' T' [6 |; h8 w/ p3 U
    // an action group, because we want these actions to be
# G4 |- M1 Q+ q2 ~2 w5 h    // executed in a specific order, but these steps should8 R0 u* p. i* J! z( m
    // take no (simulated) time. The M(foo) means "The message: a5 Q8 b5 H6 h
    // called <foo>". You can send a message To a particular! ^( D* H+ m; c- [6 N5 J* G1 {" ?
    // object, or ForEach object in a collection.. s1 Y! J; a  ]4 I8 e, l  ^
        
& ~; @( Y" Y4 P: o8 {$ }    // Note we update the heatspace in two phases: first run3 r# A9 k+ s! Q* p& N
    // diffusion, then run "updateWorld" to actually enact the
0 t& t2 b' M7 K; k: K    // changes the heatbugs have made. The ordering here is+ d: K, n* X  u$ b( v  s
    // significant!
9 A+ X9 d% O. E! G        
# _. y& v. j$ V( |/ w3 l    // Note also, that with the additional( m+ F2 ]: J3 u2 Q( W; S
    // `randomizeHeatbugUpdateOrder' Boolean flag we can4 f& T) S7 ^( Z5 C
    // randomize the order in which the bugs actually run* Q4 L: z3 M# F, o7 W& P
    // their step rule.  This has the effect of removing any* w7 e9 `2 m/ ~
    // systematic bias in the iteration throught the heatbug
5 G* Z8 ]: g7 l) R    // list from timestep to timestep' l% ~9 h$ v' f1 K- K7 t: X2 d: a8 N5 Q7 ?
        2 d! k4 G; Q* D$ [
    // By default, all `createActionForEach' modelActions have
( ~% b9 q6 T- p1 y. R    // a default order of `Sequential', which means that the
) a' u+ o) ~. V4 F9 M    // order of iteration through the `heatbugList' will be
' ?' n2 a7 B1 R0 E6 N8 U& u    // identical (assuming the list order is not changed0 f" G1 ~! A1 Q8 x* d  J1 `
    // indirectly by some other process).
9 a5 i. c" v8 @* x, _    0 E3 X5 [, l& C; Q% J
    modelActions = new ActionGroupImpl (getZone ());
/ \& o' r  C% R$ d8 z# J* Y& v- x
8 Q& F, B7 P' S4 q  R    try {
  Y# A. _; M8 s( C, U5 c6 V1 Q. S      modelActions.createActionTo$message' U, c: ?7 R3 E9 E0 z: P4 A- H
        (heat, new Selector (heat.getClass (), "stepRule", false));: S, W/ k- u% D1 c
    } catch (Exception e) {
; G) f1 Z5 F; j/ q3 K# k; B- q8 c      System.err.println ("Exception stepRule: " + e.getMessage ());' y3 j/ T% S% k& Q  A* |
    }9 H  j' Q, Y( `* s4 p2 c

$ `- x' W2 O# r0 s    try {
. H& N5 t. q4 X) j# X5 O( R: l      Heatbug proto = (Heatbug) heatbugList.get (0);, s! e( H1 M; O
      Selector sel = 9 L0 _) V7 D5 c. J1 J  c" u; q
        new Selector (proto.getClass (), "heatbugStep", false);
' x. ^. b9 L  r, K2 |; Q      actionForEach =
* F# f0 V5 m! Z& u        modelActions.createFActionForEachHomogeneous$call
# o/ w8 M9 D2 ]- n( o. d4 P2 e4 `        (heatbugList,
' ~+ @4 e+ l3 ?5 r         new FCallImpl (this, proto, sel,
; ~$ W# V* V$ L- s+ A% Y                        new FArgumentsImpl (this, sel)));1 L8 O  L0 N0 C+ A/ B! M/ z
    } catch (Exception e) {
/ f) y9 W3 ~; x- q5 Y      e.printStackTrace (System.err);
2 x9 Z4 h. {3 y5 W    }% J6 P( F7 a1 N! Z
   
5 {" m0 Z  n# F6 V    syncUpdateOrder ();
0 c1 e2 @) u+ W9 x1 ]- D. c, \5 O0 |+ u2 E
    try {
( @) E) X9 |& o3 i- D0 ~5 [  x) C      modelActions.createActionTo$message * B; w+ k& U3 K9 K
        (heat, new Selector (heat.getClass (), "updateLattice", false));7 r9 B# e8 Q- r! n
    } catch (Exception e) {
, ~2 V6 Q& ?5 Q5 V% F: R& V; C* j      System.err.println("Exception updateLattice: " + e.getMessage ());! j) F3 `  i$ @! Z. C8 \) `
    }8 D/ S) K7 D" ^! h' e9 e# k8 r
        6 _. g9 Q2 j5 Y3 g1 ?
    // Then we create a schedule that executes the2 F5 d* \* Y1 n: [' F2 `, r3 h. p& w
    // modelActions. modelActions is an ActionGroup, by itself it  ?3 U6 @0 ~" o3 B' Y
    // has no notion of time. In order to have it executed in
1 r/ N% t6 m5 V# v+ a" w    // time, we create a Schedule that says to use the
, I9 q- Z1 I. z( G    // modelActions ActionGroup at particular times.  This
& b; y& J1 w/ m1 H    // schedule has a repeat interval of 1, it will loop every, A# ?  L* \* w* X  U
    // time step.  The action is executed at time 0 relative to
3 l# m$ U) p8 \' @' ]    // the beginning of the loop., C' @; S7 O# R" e* n4 `# z$ v5 v
  \. h& L% M, v
    // This is a simple schedule, with only one action that is+ P" _$ g! D( ], C4 ?2 |. w
    // just repeated every time. See jmousetrap for more
7 }! O6 D, U' x( Q: Y5 i* {    // complicated schedules.5 e$ v) o, w+ C8 X5 _6 ~, Q. Q* ]
  
* y) W' E1 O. ?$ _  q    modelSchedule = new ScheduleImpl (getZone (), 1);
3 y1 l. T0 a( e5 M) q2 z" w; R+ d0 _    modelSchedule.at$createAction (0, modelActions);$ V- ~: g& J1 q1 l2 Q" V7 D! g
        6 s- T( e3 a3 R7 k8 @
    return this;
0 O& U: i% C8 X* p1 P  }
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