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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:
' K* v) }8 K( Z7 |( a5 d2 ?0 J/ ]
public Object buildActions () {2 c1 f0 k  M: T" [0 c0 O2 I
    super.buildActions();( Y8 [1 N# E, v$ w
    % d& [5 V/ C6 T' s1 j4 B' @, N! M
    // Create the list of simulation actions. We put these in
6 ^' u* |2 N) ^) V    // an action group, because we want these actions to be9 W2 v/ p- j! L3 X# T" R' C
    // executed in a specific order, but these steps should
7 b7 a/ M4 n) l, P7 b* r* Y3 X    // take no (simulated) time. The M(foo) means "The message
& {# ^% W+ E1 e    // called <foo>". You can send a message To a particular
  N- \# C" x% \  W- t3 N& S9 p    // object, or ForEach object in a collection.
1 X1 i3 C( b7 L6 o2 o        ) P" g! X+ ~7 x  e
    // Note we update the heatspace in two phases: first run/ [$ ~8 d3 a" r' {  U9 W" E
    // diffusion, then run "updateWorld" to actually enact the
  X$ o+ W& Q) g3 a, v    // changes the heatbugs have made. The ordering here is: {! g* c- ]' b9 M$ T: a
    // significant!1 E& Y  U( z1 R- L& I7 a9 @, {
        
* i: V& S/ W& u8 v    // Note also, that with the additional  a4 K; G  K2 r) A4 z8 [
    // `randomizeHeatbugUpdateOrder' Boolean flag we can* X1 U' t5 S) h- l1 W4 d4 ^
    // randomize the order in which the bugs actually run
7 X2 Y0 O( q) ]$ `: a    // their step rule.  This has the effect of removing any4 t- j2 z9 U! V' D  A) ~
    // systematic bias in the iteration throught the heatbug
1 @4 r/ j$ b0 V* \, I0 b% g    // list from timestep to timestep
; B4 L7 f. ^6 X$ J/ o        ( S3 S( D1 n$ r) ^
    // By default, all `createActionForEach' modelActions have
+ L3 Z: n: a6 a% Y; x; ?) [    // a default order of `Sequential', which means that the
. n" h) @& e  f/ ~$ E: r4 u    // order of iteration through the `heatbugList' will be6 W! I% h$ b$ c, K$ b$ ?
    // identical (assuming the list order is not changed
+ A, F) V  v9 N. W5 q* {    // indirectly by some other process).
( J  l2 i& ^' R    - v4 E/ [2 B7 n8 J3 `
    modelActions = new ActionGroupImpl (getZone ());% B4 P4 `0 I( v4 ]
0 _8 U7 }. S  n- I. m/ o
    try {
& w+ a. R% w' _! }# R, A& E      modelActions.createActionTo$message5 x3 n7 i7 ]- [+ E% Z3 }+ ^0 E( i
        (heat, new Selector (heat.getClass (), "stepRule", false));8 G9 j: s5 K+ u/ T/ Z; U& M- {& a
    } catch (Exception e) {) H, Y/ }/ e5 `% }* ?. C* ]3 X
      System.err.println ("Exception stepRule: " + e.getMessage ());
2 E7 U4 Q! p. v" e    }
8 P4 |8 t8 T$ p" C! q, N4 U% T, t0 [; y5 H
    try {
" I* q5 D1 P5 v; [      Heatbug proto = (Heatbug) heatbugList.get (0);% p% c- Z  \9 \. y
      Selector sel =
" i, ~6 W- p" |2 [) Z% O        new Selector (proto.getClass (), "heatbugStep", false);
4 F; z" y# R9 t6 a( |1 J5 p) g- B      actionForEach =2 |1 {/ b: @# Q4 @9 N2 Y* U8 h# A
        modelActions.createFActionForEachHomogeneous$call
9 O' k8 `$ b1 M) r/ d& P$ ]9 g        (heatbugList,6 h1 h% r2 n3 H: G2 a3 J1 f. b
         new FCallImpl (this, proto, sel,
+ G9 }0 j0 U7 ?& }: h                        new FArgumentsImpl (this, sel)));
# i! M3 G' B( ^    } catch (Exception e) {
( W6 v7 C+ t5 u5 C2 o/ R4 K      e.printStackTrace (System.err);0 x$ A3 a6 t. W- J) X, b) V
    }
, N- g- U% N2 `7 z9 Z& ?8 m    , U. H9 u1 {$ X2 V( f; E
    syncUpdateOrder ();
+ I, H( A% G, G& B9 D% [
9 R9 `( q2 }0 X9 |    try {# ~/ V* U3 B. P7 I
      modelActions.createActionTo$message
  r/ ~! }! W( Y- B. r4 z) g7 I" d        (heat, new Selector (heat.getClass (), "updateLattice", false));
  m; s% @& w* [/ D# Z    } catch (Exception e) {/ e5 v, Q0 i1 c7 K
      System.err.println("Exception updateLattice: " + e.getMessage ());
* u6 w$ F5 Q9 P    }
* I4 ^& O% K1 R4 t" P        
' \: {3 x' w& E/ Y; `    // Then we create a schedule that executes the5 [% \* f4 H: `: @
    // modelActions. modelActions is an ActionGroup, by itself it# d2 U( G9 s2 c3 q8 X6 ~7 c
    // has no notion of time. In order to have it executed in
! D5 e+ Y' X. P6 a+ ^    // time, we create a Schedule that says to use the
: `3 t- o' `: `6 _. f( y  T) I; n    // modelActions ActionGroup at particular times.  This
* }, I# C/ v. ~' }' }: e    // schedule has a repeat interval of 1, it will loop every# h" U! P# ]! f1 U* N
    // time step.  The action is executed at time 0 relative to3 W* Y0 h1 a2 w) b3 A8 T
    // the beginning of the loop.. ?( `: c: v" A2 c
  U# D; H% _0 {" o5 _1 }* t7 N, S
    // This is a simple schedule, with only one action that is
9 Z& n% Q( K: Q$ |0 R    // just repeated every time. See jmousetrap for more* a" ]. `% x& v0 y9 m- g" H
    // complicated schedules.8 K  l% k5 `, a" i6 Z4 h
  8 p) _8 b3 L9 j! X
    modelSchedule = new ScheduleImpl (getZone (), 1);4 _) Q- P3 `0 |/ t+ {! W9 ]) @
    modelSchedule.at$createAction (0, modelActions);9 }: M7 ^% q5 ?( \$ @  [
        : o* C2 B4 w. p0 @" U$ z! X
    return this;5 p1 e% Q* y8 a% I, J( y
  }
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