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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:2 j1 G8 M) Y% Z2 a; N
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public Object buildActions () {
0 {/ y1 b' h1 [5 P, i4 e    super.buildActions();* v3 Y* A! Q, C- X! m8 W! \$ ^2 e8 ^
    ) z4 T; F. D' P* m6 }7 D5 \
    // Create the list of simulation actions. We put these in) G+ D% S  {6 F0 I9 S
    // an action group, because we want these actions to be3 Z" C% V$ U, x" [+ f
    // executed in a specific order, but these steps should& D4 E* `1 Y* Q$ |5 `! F$ J) T
    // take no (simulated) time. The M(foo) means "The message
, ]9 s4 Z- Y1 o) t* B: ~/ ^    // called <foo>". You can send a message To a particular
+ D2 a' \9 `" w' H& j5 d( J( ?    // object, or ForEach object in a collection.
6 B% u' b: u3 v8 j- f        & b8 _  F+ f5 `- d0 y( q
    // Note we update the heatspace in two phases: first run/ e$ O$ v8 M2 q0 l. |- }
    // diffusion, then run "updateWorld" to actually enact the
4 e5 F/ v2 S- D& d+ {' i    // changes the heatbugs have made. The ordering here is  ?/ |, n' _; u/ N& c, ?
    // significant!% c: x1 T' t/ L
        
- e. a0 K2 a5 N( @7 [8 n    // Note also, that with the additional6 }' u# j& w! p& q
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
5 q4 H- C: I9 x2 u7 }8 S    // randomize the order in which the bugs actually run  D2 q1 Q) C1 \: u
    // their step rule.  This has the effect of removing any2 G, L5 }; `; a4 ~  g  a
    // systematic bias in the iteration throught the heatbug
& c" D% L% T# D4 @$ t    // list from timestep to timestep
/ K6 m* L- e5 P4 T4 L        
4 {1 S! M( n, V    // By default, all `createActionForEach' modelActions have
: K. R) z5 S4 \    // a default order of `Sequential', which means that the
3 i2 g  j7 B. y9 l8 n" u& }    // order of iteration through the `heatbugList' will be6 K  B; p/ r; E, r0 d# B$ e! a
    // identical (assuming the list order is not changed
( @+ j3 C& v0 N1 Y9 ?+ t  `    // indirectly by some other process).% `4 H1 V  O- x7 J7 i. Z; f) I
   
2 t0 ~, a$ N; `* L9 A  s    modelActions = new ActionGroupImpl (getZone ());
) e4 J7 R) s5 T. |# V" Y
) Z9 m  k/ j' }7 T    try {
5 y3 m3 j. B+ \      modelActions.createActionTo$message' T! z- y! W, a+ r3 j
        (heat, new Selector (heat.getClass (), "stepRule", false));6 V6 L8 [5 V! `- T7 |, e
    } catch (Exception e) {- \$ C+ I& ~- ?5 T
      System.err.println ("Exception stepRule: " + e.getMessage ());
6 ]& K6 i: r8 n/ F/ ]' |8 Z    }
) @4 B' |. b5 {0 X* J% o+ ?' \, p! q8 U" {1 l2 _( z
    try {; s0 x) L, C0 K$ |2 g1 d1 u
      Heatbug proto = (Heatbug) heatbugList.get (0);
' V9 k* ]+ h1 V1 s  O      Selector sel = ( M/ f. }( l+ e. c) q
        new Selector (proto.getClass (), "heatbugStep", false);
3 n: y6 o( L0 A  H) {      actionForEach =& d2 P+ \/ |# x' T
        modelActions.createFActionForEachHomogeneous$call7 k5 A" ~/ i; [/ z( d
        (heatbugList,
+ @+ k  z( R# n         new FCallImpl (this, proto, sel,0 w1 x5 I/ F: d
                        new FArgumentsImpl (this, sel)));
2 T! v' E6 A) D1 e! ?    } catch (Exception e) {
  _! U- i8 X+ k1 O2 \0 g      e.printStackTrace (System.err);
: o  f; b$ ~, e1 E. _    }+ G' w* j5 M8 A: r/ [- M5 E8 I7 z/ y) k
    % U3 |! v  y3 }! z( {# {9 X! o
    syncUpdateOrder ();4 \, I" Q) O$ A% r
* v, s5 _1 j! N& w
    try {# y5 K" E& a! e/ d
      modelActions.createActionTo$message
6 o5 N! T* C# X( k9 `; |6 }( s        (heat, new Selector (heat.getClass (), "updateLattice", false));4 e% S4 e! u0 J  ?& Q
    } catch (Exception e) {1 o. O8 C+ D% t* h
      System.err.println("Exception updateLattice: " + e.getMessage ());0 j# J. y$ f. X/ O; i4 V
    }
( q: L/ v* \0 l0 W' A% s        
, @. c. }0 a* {& H8 h' M    // Then we create a schedule that executes the1 a1 s# J9 i0 u
    // modelActions. modelActions is an ActionGroup, by itself it
: S/ F+ i5 b1 U: {    // has no notion of time. In order to have it executed in0 q$ `9 x  _" o& w' J, g4 _
    // time, we create a Schedule that says to use the) c; w! ^' E& h1 |) Y3 s
    // modelActions ActionGroup at particular times.  This$ p* {% A; L( H! @0 O, f. X
    // schedule has a repeat interval of 1, it will loop every
5 H. w5 C4 i) O6 ^' c7 V    // time step.  The action is executed at time 0 relative to7 S3 x! F8 \7 \, y* ]$ {# e5 u* Q' r
    // the beginning of the loop.( ?/ v+ B- V7 K5 t$ l& U# P  y, v

9 u2 o" k# X  j5 P  [* L& i1 b" R    // This is a simple schedule, with only one action that is9 W9 ]) y& a( }* [' c  c9 W" K( b
    // just repeated every time. See jmousetrap for more9 z9 E. P# F& j( j
    // complicated schedules.+ ~1 n. U' e  [9 U5 M- B
  
- u! W' [. w2 ]    modelSchedule = new ScheduleImpl (getZone (), 1);
6 z3 v7 w( M+ E" Y; C4 ^    modelSchedule.at$createAction (0, modelActions);
5 L3 I) g7 A4 [! Q* ]        
+ W# t1 V5 x; e" A, }    return this;/ b  f, R9 g+ T
  }
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