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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:
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public Object buildActions () {0 u. Z* {* x5 n$ n  H. m
    super.buildActions();
: ~; M) r& I% o, ~2 _# {: [   
1 w  c4 m; @' e5 J4 m    // Create the list of simulation actions. We put these in
2 o3 x2 o, h7 ^* z1 X" S) B    // an action group, because we want these actions to be, X/ d: a/ S0 z/ E, b6 Q
    // executed in a specific order, but these steps should; l4 s; M; Z5 R: X8 T$ e
    // take no (simulated) time. The M(foo) means "The message
, T9 `2 j3 L* d$ X) g    // called <foo>". You can send a message To a particular! l3 f! |  h8 K. T
    // object, or ForEach object in a collection.
5 @4 |& P9 [3 P+ s" U        
/ n  D# {& W: s    // Note we update the heatspace in two phases: first run5 t0 L$ F  C/ b7 `1 D- |' g5 c$ s$ P
    // diffusion, then run "updateWorld" to actually enact the2 m+ u/ [* }' i2 t. M; b8 z* l; E
    // changes the heatbugs have made. The ordering here is5 J; I# U7 q- i" i1 m7 _( v, Y
    // significant!
4 @, C- }( C5 H, Q        , @; c' D8 ?$ F; `) R' K3 i0 Z
    // Note also, that with the additional
1 [/ n; x* I% a( o' U    // `randomizeHeatbugUpdateOrder' Boolean flag we can
2 G. l) v( v( z# v5 g; z& }    // randomize the order in which the bugs actually run
# `  Z- i+ i4 @* z$ y! d; i2 w    // their step rule.  This has the effect of removing any' X! {1 D1 T3 }
    // systematic bias in the iteration throught the heatbug
2 y# U1 z0 Q! \    // list from timestep to timestep
: t1 }* x3 t" }        - y6 G! y7 w( L4 c( S# _
    // By default, all `createActionForEach' modelActions have) r+ J, g  [! z
    // a default order of `Sequential', which means that the) e$ e$ ?# Y: [  v# T
    // order of iteration through the `heatbugList' will be9 a# Z" {7 I' v/ E
    // identical (assuming the list order is not changed2 d7 b/ C7 o% }
    // indirectly by some other process).
! [" r1 e- T& z4 ?    7 I1 q* {8 P; g
    modelActions = new ActionGroupImpl (getZone ());& K" |: M# _$ J+ V, Z
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    try {
+ V  Q6 i* C9 G- V      modelActions.createActionTo$message; w: f2 u# ]8 d; i6 m
        (heat, new Selector (heat.getClass (), "stepRule", false));
7 G  T' G  ^. L' x7 z, n4 p2 m) f    } catch (Exception e) {
) Z$ J# O' I$ z% [      System.err.println ("Exception stepRule: " + e.getMessage ());( E; k+ W' [. P% ~
    }; r( }& }/ H+ t3 I) C) L

! c$ g6 k9 L; n+ N& o% E: Z    try {0 l1 W  s. x, a; U! F
      Heatbug proto = (Heatbug) heatbugList.get (0);& g' I# w/ i  Q1 m6 h5 s% ]2 r
      Selector sel = # G2 ]7 M  ]& U& y# f1 v4 j. A
        new Selector (proto.getClass (), "heatbugStep", false);' w3 e' m) N. L9 m! R5 X5 T1 U+ K
      actionForEach =: P9 ]: o; d6 F8 i; K
        modelActions.createFActionForEachHomogeneous$call; Y' u- I4 ~4 T; C# [
        (heatbugList,2 h2 }: {+ g. l; p" z
         new FCallImpl (this, proto, sel,1 |* G" K- C, Q0 V$ `8 j: Z; ~' J8 A
                        new FArgumentsImpl (this, sel)));
3 K6 Q8 ~# i8 f2 J* h. q: @    } catch (Exception e) {
* V  n9 }' n- T. I! q0 U' D8 p( I* y: I      e.printStackTrace (System.err);
6 B  a& H9 C5 f5 r; ]- z    }7 f& B0 C) z- u9 w7 h/ Q  B" u
    2 M2 c' T; p' b0 Y. |! ^3 l  q
    syncUpdateOrder ();5 {3 z  n% i" X! z

; S8 u& R! G1 P' B5 t9 H- O" o8 R6 Y    try {
( h5 a6 f; V3 W  n, J      modelActions.createActionTo$message * ?7 y8 Y% f( n& }' X8 b  q$ Q
        (heat, new Selector (heat.getClass (), "updateLattice", false));, P3 \+ D3 i0 o* P& r2 F
    } catch (Exception e) {
  J1 f) q; A+ u1 R      System.err.println("Exception updateLattice: " + e.getMessage ());# t: H( h# [  N" u) H: a2 ?6 e* }+ W2 q2 u
    }8 c: B8 K* ]6 ?& y$ ^4 g# [
        9 _" t6 g; o# `- u2 T' n) q
    // Then we create a schedule that executes the
) o- _& S5 E* I0 t( O! {    // modelActions. modelActions is an ActionGroup, by itself it
8 A: R5 ~$ S$ {. ]% I1 V    // has no notion of time. In order to have it executed in
7 ?$ d2 k  v4 @6 }: J  {: \    // time, we create a Schedule that says to use the3 I. h4 L. I7 y) M
    // modelActions ActionGroup at particular times.  This
5 H3 b- [5 n1 k4 D$ _8 ]+ d    // schedule has a repeat interval of 1, it will loop every
7 g2 X; O) p7 j( ?0 D+ K1 W/ o    // time step.  The action is executed at time 0 relative to' M5 a. X, v& R- I. x4 V+ g
    // the beginning of the loop.9 M# c+ g/ X# c# Q  Y
. m  y8 h- n) ]% B
    // This is a simple schedule, with only one action that is  T5 s! k  B$ ^; s" u+ d; c" ~9 g
    // just repeated every time. See jmousetrap for more4 O6 X+ h; ^. [2 l" O8 t
    // complicated schedules.' K  V5 ^8 f; `9 i% i. ^
  
$ `6 H- z( R( y    modelSchedule = new ScheduleImpl (getZone (), 1);
, a: e$ n3 Y7 h( {( v    modelSchedule.at$createAction (0, modelActions);
3 c! p: c' F5 c7 z& C4 v' @        5 f3 Z' L$ g% {4 N& i/ |1 M
    return this;  ?- T5 |4 j6 E
  }
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