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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 C& l1 i% d/ {" I1 L
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public Object buildActions () {
. G& a% c$ b5 R* _6 R  |/ U! W9 D0 h& e    super.buildActions();, `" S1 e- [& E4 w' A* I
    0 C3 K5 k5 t* z' p* B/ B6 Q- q
    // Create the list of simulation actions. We put these in
( k- X  M& W3 L4 a# j5 P: }& [    // an action group, because we want these actions to be
+ c/ }' ?3 a: k% q8 {    // executed in a specific order, but these steps should
* S# F% D& G5 h- E1 x+ ~  e8 G    // take no (simulated) time. The M(foo) means "The message
* z, Y# S$ r' m5 [    // called <foo>". You can send a message To a particular
" G8 R3 M( M' z$ j# K    // object, or ForEach object in a collection.5 c* c' R2 [  G2 ~- P8 Y1 x
        
: e/ I! P% X0 w3 y' J2 D    // Note we update the heatspace in two phases: first run" r8 R) t+ R; S  Y, F7 H0 ^5 |/ a
    // diffusion, then run "updateWorld" to actually enact the
9 d9 h3 ?' s5 V1 b, j    // changes the heatbugs have made. The ordering here is
' m; Q& }, w6 e  P    // significant!
) V/ x2 N. h" Q7 g        ' R  a- g1 [( L3 c! Y2 a; o, w
    // Note also, that with the additional
" W( X; J8 ^7 I8 |. [    // `randomizeHeatbugUpdateOrder' Boolean flag we can0 h; A2 ~6 {3 W4 |6 F+ z0 n9 c; h$ h
    // randomize the order in which the bugs actually run
9 N6 ^# I# g# m- p: H    // their step rule.  This has the effect of removing any
$ i: M. G/ |* ?! Y( l" K, o$ I/ \    // systematic bias in the iteration throught the heatbug
2 H# u7 \) J' y    // list from timestep to timestep, J  y9 k+ u; @: O- f
        
- ?- E* @+ a( C0 n: d    // By default, all `createActionForEach' modelActions have3 p& Y( t2 A5 Q1 r+ K2 ]
    // a default order of `Sequential', which means that the
4 f, a1 T/ A7 X8 e7 s4 E* w+ u    // order of iteration through the `heatbugList' will be
, e" L5 X6 R4 _5 C$ g    // identical (assuming the list order is not changed& l0 r5 s" t+ {- x' b1 g
    // indirectly by some other process).
& b; M6 p1 ]0 p+ `% T    . I0 N, ^& X* C. p$ C. b9 o
    modelActions = new ActionGroupImpl (getZone ());
( ]! q, h0 F/ N$ i2 j( F
9 _" @3 i) A" {/ ~9 c# v% F. B5 t    try {
$ r5 d# v9 S* [# m2 \: S6 E* w      modelActions.createActionTo$message5 O) v6 ]/ y& ^# t( M) t  j% }; s
        (heat, new Selector (heat.getClass (), "stepRule", false));% ]3 N9 b: X$ `2 I9 w
    } catch (Exception e) {
* J0 a4 O) x4 T- F      System.err.println ("Exception stepRule: " + e.getMessage ());
# u7 I7 q. }8 B! t/ F    }
: n& C# ?, l% Q6 q/ y& p( X, j$ x3 ?
    try {
  F9 [* R; r) ~7 e8 E0 H4 r      Heatbug proto = (Heatbug) heatbugList.get (0);
4 H4 n& k3 l$ U( l0 v+ q      Selector sel = 5 d9 i$ j5 B8 F1 N  w( c7 f
        new Selector (proto.getClass (), "heatbugStep", false);, f! J. N8 m0 J5 ?" V
      actionForEach =" G# t- G0 k  v" P; F5 {: K
        modelActions.createFActionForEachHomogeneous$call
, p6 T* q# \- r        (heatbugList,3 Q7 _  H2 L" |( v& l0 Z1 O/ X
         new FCallImpl (this, proto, sel,
8 z# `, h. |$ X* {- e" }                        new FArgumentsImpl (this, sel)));
5 y5 h5 q# W. ?; C0 H' ?7 f6 y; V    } catch (Exception e) {
* O. ]4 R9 N% `6 N      e.printStackTrace (System.err);
6 T( g4 ^' A5 Z; B/ }    }
& ^6 }+ [2 }/ [  H  v   
  C2 h# ?' S$ W# `1 ?9 m. i    syncUpdateOrder ();
9 Y1 C& o* k' l5 @3 d0 W. D, h, Y' Z
    try {
% A5 u* x7 ]' q1 [% }      modelActions.createActionTo$message
* ^: {' _( Y! `3 r% N  k# w        (heat, new Selector (heat.getClass (), "updateLattice", false));
/ d/ [3 |' t3 v    } catch (Exception e) {+ ~  s* D" I1 i1 u1 _
      System.err.println("Exception updateLattice: " + e.getMessage ());! k' {. ]5 n% S. {& T& D6 L* m. O
    }9 u% a2 y  M, J# J* `* H
        
2 v) |& A" R4 b2 U    // Then we create a schedule that executes the
0 N1 |6 j7 o  J8 b6 L. I    // modelActions. modelActions is an ActionGroup, by itself it
" F' }& G0 h8 U8 ^: \    // has no notion of time. In order to have it executed in
* g1 ~8 x1 G( d. F: r( M; m( x    // time, we create a Schedule that says to use the
8 X* W4 y4 G! m+ u% m2 }    // modelActions ActionGroup at particular times.  This
8 o. x) x' h9 G7 z    // schedule has a repeat interval of 1, it will loop every
1 r. x) W4 l# q) R+ b    // time step.  The action is executed at time 0 relative to
5 R, e0 z: U" F$ x9 ]3 g' H6 r    // the beginning of the loop.0 M/ p* @' ]: F
1 x& N1 M7 S9 H; n# h7 _
    // This is a simple schedule, with only one action that is) D& a5 o- O) b; h9 U1 `7 e6 |( B
    // just repeated every time. See jmousetrap for more! w3 a' k, P) P" o. G' {
    // complicated schedules.
2 W. w1 q" v% v# L  X  " p" \7 m6 u6 k, b8 e
    modelSchedule = new ScheduleImpl (getZone (), 1);
! e/ Z: Q2 ^" d: J4 F" f    modelSchedule.at$createAction (0, modelActions);3 |" m) a" ~( o7 o8 ~+ z2 w2 B* k, P
        
# Z/ n' j* v0 R6 k    return this;
& k. {2 k3 V& F  }
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