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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:  X9 o' Z$ P; ]$ `; h! Y' W+ _) S
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public Object buildActions () {- T" @3 b* x: y/ ?
    super.buildActions();
4 \6 [. u/ U: r2 {7 t    ( H9 a- y/ D# u& g: H
    // Create the list of simulation actions. We put these in; S# Q. r0 ~5 i1 A4 X. h! V+ g
    // an action group, because we want these actions to be" |; Y4 b! H4 S& `" E
    // executed in a specific order, but these steps should2 r4 X2 ^7 ^1 r
    // take no (simulated) time. The M(foo) means "The message. M( i  b4 ]4 h- U( P
    // called <foo>". You can send a message To a particular+ C  T. `3 }8 A! p8 f
    // object, or ForEach object in a collection.
& N/ P6 n- P# m' F" b        9 K+ Q- k7 W; @+ y( m# H1 t
    // Note we update the heatspace in two phases: first run/ \; h3 p0 A$ @! Q) S
    // diffusion, then run "updateWorld" to actually enact the  e4 D) i! S+ O# ?& r# g  z
    // changes the heatbugs have made. The ordering here is
* J( ]7 Q4 o) [+ _% K    // significant!, x% R. s) O" t
        % f9 h: F1 g# j
    // Note also, that with the additional" r  J( k& y$ r1 c$ L6 i9 R' w
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
/ l" z* B4 _* l+ z$ K. N+ ?& I    // randomize the order in which the bugs actually run9 X, h6 d  b# i! Q
    // their step rule.  This has the effect of removing any' v0 b! C4 @( {; D: p6 O, h
    // systematic bias in the iteration throught the heatbug
, Q* S; L6 X4 V' P    // list from timestep to timestep9 n1 B; m2 [2 k1 N
        * w  ~" i* s/ `7 `) b0 q
    // By default, all `createActionForEach' modelActions have. ?! p, t4 h* s0 m" H# N- v
    // a default order of `Sequential', which means that the& U* ~7 D% x1 w) d- x
    // order of iteration through the `heatbugList' will be9 H/ \0 z* T+ W1 x5 z+ o
    // identical (assuming the list order is not changed
3 C+ [# N* e. L' U# K- ]. S1 l    // indirectly by some other process).
. `9 X$ o6 g( J8 Q9 N' N' \    0 h* G6 \$ D, N. A  x
    modelActions = new ActionGroupImpl (getZone ());0 }; W4 J- f) t% M

9 W. z7 P  {4 V: @+ n; N2 H    try {
5 g8 Y. f) J" \8 s      modelActions.createActionTo$message
5 g, K1 t* N) t! ]- k( P        (heat, new Selector (heat.getClass (), "stepRule", false));; A  M% Y8 @3 W4 }8 D+ B! O
    } catch (Exception e) {
8 ?; b5 ^( m7 Y" Q      System.err.println ("Exception stepRule: " + e.getMessage ());& b/ }. z. j' o# Z! Q5 i( v
    }
+ t8 W8 P! E6 v5 ?  Y$ E8 i' b) f9 [6 w+ g
    try {, {/ E6 l/ \7 }
      Heatbug proto = (Heatbug) heatbugList.get (0);5 l' W7 M3 s' @
      Selector sel =
' n4 W* t  \+ {/ @! K2 G" P        new Selector (proto.getClass (), "heatbugStep", false);
" Y. x! e, G! `/ v: ]% R) Q/ [      actionForEach =
" {* {# F4 H0 t. h2 K" ]. B        modelActions.createFActionForEachHomogeneous$call
/ s4 j. _( x' R+ o( J8 B$ h% v        (heatbugList,, T; w# a, O9 N. s
         new FCallImpl (this, proto, sel,
/ l  w3 T1 y8 j! i                        new FArgumentsImpl (this, sel)));& ?* h, `0 P6 w5 M
    } catch (Exception e) {( N' D6 s: y0 i; C/ C7 r
      e.printStackTrace (System.err);
5 R% l7 A. u$ B    }+ V6 s! J  H5 E; c, {
   
- P6 i, B1 _! f4 m, I    syncUpdateOrder ();
' a& ?/ R4 N7 `+ G6 P$ @' F# {
7 a1 X7 ]! N! A1 g6 c    try {  _6 b7 N0 ?  l- a9 y
      modelActions.createActionTo$message
) C5 D6 T: e* U2 I! U) ]+ \$ P8 w/ Q        (heat, new Selector (heat.getClass (), "updateLattice", false));
2 [( M. g% ?2 G1 t8 c, x! m$ I    } catch (Exception e) {1 _1 O) {, {" `% l! B( k+ m
      System.err.println("Exception updateLattice: " + e.getMessage ());
' j- z1 d/ {4 |1 U: g* A3 t    }  K, \8 b8 |+ z  J& I' p  [6 f9 H
        / Q5 K3 M3 ]! ^2 _% Z, u" t% r7 x
    // Then we create a schedule that executes the
5 P6 W0 r$ O1 |# J    // modelActions. modelActions is an ActionGroup, by itself it& E- \6 Q( ?  Z' S/ E
    // has no notion of time. In order to have it executed in
' N6 U# ^4 X% C$ _9 ^- }0 L$ T  F$ S    // time, we create a Schedule that says to use the
# ?5 y, ]0 z7 U- ~" E0 A    // modelActions ActionGroup at particular times.  This
# p4 A% L8 H; |6 Q( t    // schedule has a repeat interval of 1, it will loop every
8 N5 l( n  l. O9 j" W- v5 i3 Z    // time step.  The action is executed at time 0 relative to
9 b  ~1 ], I% y' a    // the beginning of the loop.* N& m! [/ I9 Z2 J7 j

( P2 l. W4 P' L; B& @    // This is a simple schedule, with only one action that is6 m) f  z" ?, V, {
    // just repeated every time. See jmousetrap for more
3 R. z  K4 l, }1 k3 x+ Y, O    // complicated schedules.
1 L( X/ j6 R8 O% N; U' }( b  
! m: [) G$ Q/ p: `. \* J. Z1 @4 \: P    modelSchedule = new ScheduleImpl (getZone (), 1);: u# n! W- m0 b* T9 S! x
    modelSchedule.at$createAction (0, modelActions);
7 e6 Y2 |* h2 v- I0 r5 ?: I- X: w$ n% a        
3 p, \/ d2 N/ K5 y& y    return this;
9 b! R& z. z9 w2 b8 v" u  }
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