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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 I3 I* `0 E: H
    super.buildActions();
, S/ T5 V! Z1 Y8 L; |/ ~    - }; c  p4 `8 m/ v# L! m7 |
    // Create the list of simulation actions. We put these in3 l! J3 t( f. e% a/ J/ d# ]; H
    // an action group, because we want these actions to be
; r# {* N, H- N6 E8 m; a1 M    // executed in a specific order, but these steps should; F' S0 C, S- O. z" ^
    // take no (simulated) time. The M(foo) means "The message
& K* r0 ]; u6 j1 ^# a    // called <foo>". You can send a message To a particular
( l# D9 }  K- \8 k+ s' m    // object, or ForEach object in a collection.2 H5 F' r1 ^# e
        " j# Q2 I' e1 U$ z2 ^
    // Note we update the heatspace in two phases: first run4 `. ~& I' |, l8 r
    // diffusion, then run "updateWorld" to actually enact the
' Y' _3 |! U' s    // changes the heatbugs have made. The ordering here is- K6 o" W& o: N0 `7 m  g; H
    // significant!
! ]1 f( H/ j0 i8 l. N5 \5 ]        & y, [' z" y1 [3 n( [+ _9 D0 w! x$ F+ x
    // Note also, that with the additional, i. p% Z% r6 e5 o9 b
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
) G6 m0 d1 O1 l' u0 D4 q/ s8 l; m7 L    // randomize the order in which the bugs actually run8 N& L( O; ?- R. m
    // their step rule.  This has the effect of removing any
2 J' R* y5 M- K: t. C    // systematic bias in the iteration throught the heatbug
9 J1 K) h3 Q  J! b* ]- \5 Y# t    // list from timestep to timestep
7 ~! w( v" ]( S: k6 e- \7 P        & z5 Y1 F7 a; n  l9 h8 _* I
    // By default, all `createActionForEach' modelActions have
  X6 L% b4 }; M1 h' x4 T' i& R    // a default order of `Sequential', which means that the9 C8 ?3 h  x8 }9 L. k
    // order of iteration through the `heatbugList' will be) F- \7 K$ ^& e
    // identical (assuming the list order is not changed
% I( v+ z, b7 V    // indirectly by some other process).
( `! z& z/ f' r- g( l! m7 v* }. L    . h( y  R* d5 [" l- S
    modelActions = new ActionGroupImpl (getZone ());5 z9 o2 v6 d1 h
$ O0 w8 B* ]- U8 f- ^
    try {7 m0 b8 r& t. |4 O. _1 ~
      modelActions.createActionTo$message
0 |. T7 {8 x6 B5 ]8 R        (heat, new Selector (heat.getClass (), "stepRule", false));
5 v9 k7 z& }, ?, w2 ?5 E% }    } catch (Exception e) {
7 [4 x7 t3 T3 X      System.err.println ("Exception stepRule: " + e.getMessage ());4 t, l4 y  t! l  @
    }
8 b$ ?5 F- `8 W- z
7 y7 \. q$ {3 X5 k) I    try {8 T" y- M2 S2 p' a& j3 b& n8 X% w3 R
      Heatbug proto = (Heatbug) heatbugList.get (0);* {: h$ i3 u; M
      Selector sel =
& z8 F; t& ^3 s6 s/ H) S1 g% J        new Selector (proto.getClass (), "heatbugStep", false);
  e" H  o1 |: L4 t( P. Y      actionForEach =
0 S) u7 c2 n5 {( |+ j        modelActions.createFActionForEachHomogeneous$call* P8 W5 m+ ]9 _' w
        (heatbugList,
0 `' B* W6 h( o- a* ^6 s7 u         new FCallImpl (this, proto, sel,3 N& Q6 E& C; ]) y0 \% i! z+ B) }
                        new FArgumentsImpl (this, sel)));
3 c6 [: P9 C, z, [  Y* A( K6 c    } catch (Exception e) {9 e( i2 V; U0 @& m0 ~2 P
      e.printStackTrace (System.err);8 K+ I7 V: Q( Q0 q. D) x+ ^9 o* ?
    }6 S* ]2 U% l) V! P& v
    7 E4 u4 o( D, j; D7 Y2 P& a
    syncUpdateOrder ();
  j* k- Q- n/ n$ z
+ E8 \* k8 Z. a) u1 u, V! j9 ^. Y    try {
' r8 ^2 S& |! n' w      modelActions.createActionTo$message 6 P4 q/ w8 {3 C: w
        (heat, new Selector (heat.getClass (), "updateLattice", false));/ Z8 ?# w7 w+ n/ W* W
    } catch (Exception e) {
' u' S: f9 T; z8 a      System.err.println("Exception updateLattice: " + e.getMessage ());2 I, B9 A( A2 Z# R- x
    }
- ^) O7 ]  `8 m        ! p! Z8 V& |+ T2 K% k
    // Then we create a schedule that executes the' d" n* B( S- a5 s
    // modelActions. modelActions is an ActionGroup, by itself it
/ v8 q) `/ Q7 N0 v+ z4 Q    // has no notion of time. In order to have it executed in
6 ?+ E6 k* d' y9 |) @: m6 G3 B    // time, we create a Schedule that says to use the* P/ ~% J; T! }+ v
    // modelActions ActionGroup at particular times.  This8 S; m* i, y. ^' q0 a' `# F2 Q
    // schedule has a repeat interval of 1, it will loop every" E% v  t2 R9 ~" o) V) `' v
    // time step.  The action is executed at time 0 relative to  n. q" m, a4 L
    // the beginning of the loop.
4 m$ m" z+ p3 ^  D" d$ t& E0 L# z5 O. K3 i( E3 M0 v: v
    // This is a simple schedule, with only one action that is
& b. L/ x( x  Y5 w( ]+ a' R    // just repeated every time. See jmousetrap for more2 K& K! G- o8 a
    // complicated schedules.
  m: k1 s- r, Y- |8 l  
, K5 t5 [8 r9 H8 R, L1 H+ J  E    modelSchedule = new ScheduleImpl (getZone (), 1);
  K1 J( b6 s( E- z. @    modelSchedule.at$createAction (0, modelActions);3 c) u6 p# Z% n- b: _
        2 o: ?! {! h5 `9 T
    return this;1 V8 f2 {  S# c) x6 g  a; h
  }
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