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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 X7 A: y& P4 z$ H4 O
# m, K3 C/ b  m) G; ]) q# C* K public Object buildActions () {
9 n% i2 W2 K4 g3 c5 J    super.buildActions();
* b7 O7 ?7 N8 T8 ~! O* \2 O   
, K% V) X! H* h  x+ b4 g" R    // Create the list of simulation actions. We put these in' X1 O# p9 j5 c
    // an action group, because we want these actions to be
. t' S/ v9 J$ X6 l" k4 H5 x# [& w    // executed in a specific order, but these steps should5 j& m. V; p- j" L: |# M
    // take no (simulated) time. The M(foo) means "The message6 @2 i, Q; q5 E3 B! s7 B) v
    // called <foo>". You can send a message To a particular
- p  |1 g* s- G; Q0 y    // object, or ForEach object in a collection.# c. C# I% v! e
        
9 r/ w' S8 Y/ n3 Q% b    // Note we update the heatspace in two phases: first run  E; e" t, `5 D. W
    // diffusion, then run "updateWorld" to actually enact the
- o0 e, E4 T6 M+ v    // changes the heatbugs have made. The ordering here is" i6 T1 P% L0 s4 e& Z
    // significant!2 z3 P. ^- E- V
        3 x$ X: C' y2 ?$ R7 v' L) t1 x
    // Note also, that with the additional
( i3 Z) u1 r; `- ]: N; i" m    // `randomizeHeatbugUpdateOrder' Boolean flag we can) b4 V8 r. @, e  c
    // randomize the order in which the bugs actually run/ @, Y- F. U9 U: N3 N
    // their step rule.  This has the effect of removing any9 d4 q0 T# ?) d& n, Q8 E+ _
    // systematic bias in the iteration throught the heatbug6 y8 k9 |5 [. s& x
    // list from timestep to timestep( N0 |, F' Y0 v
        
0 t- k3 A# N) ?. Q    // By default, all `createActionForEach' modelActions have
( i9 m7 O3 ], m% c    // a default order of `Sequential', which means that the
  ^2 p" j( {, N" ?* |- A1 B    // order of iteration through the `heatbugList' will be) i3 k% s1 Z" _4 ?; V
    // identical (assuming the list order is not changed
4 ~0 h) a8 \# \0 K2 `* R  J    // indirectly by some other process).( q7 f$ u: O0 N
   
* Y: v) o, H5 A1 J' R& S    modelActions = new ActionGroupImpl (getZone ());5 m7 m' c. k7 Z- h' m0 f  [/ q
( Q+ n" z" J2 Y) f3 m% f0 \2 h- ^
    try {
( O5 u/ Z1 E% o* K& v  X      modelActions.createActionTo$message1 n: Q$ j4 d; k+ `
        (heat, new Selector (heat.getClass (), "stepRule", false));) b: S0 b8 [( v1 G& `
    } catch (Exception e) {
5 I8 f# H* s# M% K7 K% h      System.err.println ("Exception stepRule: " + e.getMessage ());
; v$ D1 I  K7 l- C    }
5 N) E2 _1 d. R' J: g" U! b0 X( z0 q. j7 I( p$ t9 i
    try {
+ g9 W% S9 I0 ^% E( w      Heatbug proto = (Heatbug) heatbugList.get (0);
, t' O+ q+ I3 o3 q( p6 J      Selector sel =
7 \' O  [' Z4 H/ i4 D4 s2 B        new Selector (proto.getClass (), "heatbugStep", false);; ^5 l; w' L+ c9 l
      actionForEach =
" S8 W& M& c7 J        modelActions.createFActionForEachHomogeneous$call
( G4 K* p& e8 G3 ]        (heatbugList,9 C' W' _0 P6 R5 |+ o5 v% Q/ T
         new FCallImpl (this, proto, sel,, }3 N. I+ H; w; r
                        new FArgumentsImpl (this, sel)));
2 U% j2 {' @3 ]" R, }) {    } catch (Exception e) {
# g4 N! g! S+ l9 A4 V* i% M- @      e.printStackTrace (System.err);
2 D* k& b9 G9 @  r8 |( r/ ]    }+ `; I- l2 Q& g  P% ]" Z: e
   
- J$ M' L  K+ P    syncUpdateOrder ();. L) i( E1 Y8 D, F3 i+ D

6 V# H8 G) A/ B) m9 K    try {! j$ U  P; v: v6 U$ x% e0 q
      modelActions.createActionTo$message
) f. \, O, ^6 t+ y+ E        (heat, new Selector (heat.getClass (), "updateLattice", false));
* m5 I, r& p+ `/ L0 a    } catch (Exception e) {
5 m1 Z% Z) n  o: y      System.err.println("Exception updateLattice: " + e.getMessage ());- ^5 v0 q$ Z7 }  H9 Q* l3 |
    }
4 G5 q3 L" K! Z' N- N        
, |  l8 o/ n" H. Y    // Then we create a schedule that executes the7 [3 ?1 W  A) e5 E: ~# k  H( V8 T4 o' W1 w
    // modelActions. modelActions is an ActionGroup, by itself it) z1 J, O$ v' a8 |% u$ j4 C
    // has no notion of time. In order to have it executed in' J8 N( H8 H7 ?4 h  D! ?7 i! O
    // time, we create a Schedule that says to use the6 K0 E; q3 ]/ K; O8 ?4 P
    // modelActions ActionGroup at particular times.  This- x2 F2 k* C; k8 X2 Q' \
    // schedule has a repeat interval of 1, it will loop every
/ x, Q6 f% j/ d! e* Y3 z    // time step.  The action is executed at time 0 relative to. z, U: f: N8 y5 L2 D
    // the beginning of the loop.: e2 Y8 q% W7 l& T( d
3 }" i4 q7 f" M% w  A% x
    // This is a simple schedule, with only one action that is
, i6 O/ R; W, o% |    // just repeated every time. See jmousetrap for more; t7 M4 r) \; K7 [) M1 x5 Q
    // complicated schedules.
; m9 T$ j* ?: H9 j  " T3 c! y; Z1 j/ [7 l2 P
    modelSchedule = new ScheduleImpl (getZone (), 1);
( H# \8 h7 ?0 Y* \: w7 M    modelSchedule.at$createAction (0, modelActions);( d/ y% C1 \2 f0 K
        ' T0 |! A0 j4 d% V1 M: \
    return this;
( C7 I& h! J  a% g7 E# L2 \, J& d- ]  }
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