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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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0 w9 m2 E2 D( G6 A/ N1 p) S public Object buildActions () {$ e! R( V3 v! A. e
    super.buildActions();
& y( r" N  }0 |* }6 L    ( x+ B+ S' }4 B* D+ y
    // Create the list of simulation actions. We put these in0 n8 w" ]( m; d3 J2 m9 N
    // an action group, because we want these actions to be
- m% y5 ?3 ~2 w$ H+ j+ a9 E    // executed in a specific order, but these steps should
% k& u3 B3 V8 p$ g" B+ X    // take no (simulated) time. The M(foo) means "The message
- t  l' X4 V: i# B* u    // called <foo>". You can send a message To a particular
6 v( Y; o2 |% {9 O1 B& l; S8 e    // object, or ForEach object in a collection.
- k. _; Z$ q1 `6 e6 ^4 [        $ H& g" s/ w5 i; j# E+ |$ e
    // Note we update the heatspace in two phases: first run
$ R0 {$ L- i4 i9 Q    // diffusion, then run "updateWorld" to actually enact the$ O# z, A! _/ a" V0 b, M' N! B
    // changes the heatbugs have made. The ordering here is
% X  k$ R$ v. a/ ]) g    // significant!: r4 s% \4 H% [, k+ a
        ) k, w$ b2 K! e& a
    // Note also, that with the additional
  A, F5 |  f/ z3 L0 |& U2 s& T    // `randomizeHeatbugUpdateOrder' Boolean flag we can% U' n6 P7 M: V
    // randomize the order in which the bugs actually run+ v# u7 O9 D5 A. b9 Z
    // their step rule.  This has the effect of removing any- N3 P' y# c/ u0 j9 _, l
    // systematic bias in the iteration throught the heatbug
% Z1 [! i5 E" H9 w, B! Y    // list from timestep to timestep
: K  R1 E; H# i6 r4 a. }6 {, C        
* Y$ {# [: W& z  ~6 R8 i& p, }. E    // By default, all `createActionForEach' modelActions have
; k# [. z% I" g" g    // a default order of `Sequential', which means that the+ i9 t: l+ M6 f% z
    // order of iteration through the `heatbugList' will be4 ^/ g5 Q8 s# |) f) e
    // identical (assuming the list order is not changed
: d0 B% W# t7 o  e! u4 \( I    // indirectly by some other process).- A; q+ Y" P3 x7 Z) e
   
- j  l/ T3 }9 P    modelActions = new ActionGroupImpl (getZone ());
# G' U  K: u9 I8 m: M$ w8 f* A2 Q" X5 A, r5 b
    try {
  U3 X: s4 ~* z' l      modelActions.createActionTo$message" Z% H/ }  x' e( F; `' q
        (heat, new Selector (heat.getClass (), "stepRule", false));4 _6 |- m1 \4 I9 @% [& Z
    } catch (Exception e) {# w0 V$ u3 K6 b% P4 M" o5 @
      System.err.println ("Exception stepRule: " + e.getMessage ());; i) O4 e' X$ x. i$ k, W$ V- A% K7 q
    }
' p" [4 \( |/ r. }# k9 f  {# Y" W3 c- v# k# z) [! y) G, l. I
    try {
& A; I! y: E1 A" t! b      Heatbug proto = (Heatbug) heatbugList.get (0);
1 _7 J5 G7 n8 ]  d8 R7 V' W      Selector sel = # t6 h' _8 h1 A0 i! _
        new Selector (proto.getClass (), "heatbugStep", false);3 ]% ~; G  {5 L" ]; C% k) N
      actionForEach =
% i3 |: b' J( f  ~: F        modelActions.createFActionForEachHomogeneous$call
* F/ M+ o6 m% p1 w# W. r, O" t        (heatbugList,
7 \, z4 g# q1 d         new FCallImpl (this, proto, sel,
' E3 T( h5 c2 a) y0 y5 ^* U! ]4 ]                        new FArgumentsImpl (this, sel)));
  H% R. |; \4 y( l0 v+ H' \& V    } catch (Exception e) {
5 p; O9 x' D; }      e.printStackTrace (System.err);/ |0 N. Y6 C6 G. E4 R# Y3 G% H
    }
  Y6 _& \0 l  n8 C( N    % n# O" M" H" x/ G. b# n7 m) u
    syncUpdateOrder ();
- \0 Q/ N9 q! L' ]8 t$ @, x7 L# s) T3 u! }; b) ~' x
    try {2 i) \- |; o# k, J
      modelActions.createActionTo$message
6 O8 a; M" W3 X        (heat, new Selector (heat.getClass (), "updateLattice", false));2 u$ e# A: u. g6 j- F% o' F. Z2 L( E
    } catch (Exception e) {
- B- p6 i2 ?  a4 K; X      System.err.println("Exception updateLattice: " + e.getMessage ());
6 D- b3 i: V2 L/ ^    }
$ r) G, C# \4 W2 |' L3 p" C" ?          y  I. d$ m4 {$ H" l
    // Then we create a schedule that executes the
* N; [- \0 _5 w8 T) B$ d    // modelActions. modelActions is an ActionGroup, by itself it5 |' W6 y7 ?) H2 w: X. L
    // has no notion of time. In order to have it executed in
# [1 W) g: Y  X7 m7 i4 G, ?7 q    // time, we create a Schedule that says to use the
! N9 x0 I  @0 R    // modelActions ActionGroup at particular times.  This' d) Q" }+ x3 F  S3 N+ X
    // schedule has a repeat interval of 1, it will loop every/ }! @3 s1 I$ E- Q! X
    // time step.  The action is executed at time 0 relative to
4 ~' ~4 n/ |0 R6 @6 v- t6 f    // the beginning of the loop.
& ]! k6 Y) k& l; ^# a0 a) R
2 [3 ^4 z& ^% I1 ^    // This is a simple schedule, with only one action that is
1 a% u- X: N9 T* d" c$ p    // just repeated every time. See jmousetrap for more
( m- J3 x/ A* G% h, K- {$ Z    // complicated schedules.
$ @" F; V5 K/ b) Q  
; |  }, a1 G/ g1 s    modelSchedule = new ScheduleImpl (getZone (), 1);) q8 w4 O% n: W( q) F
    modelSchedule.at$createAction (0, modelActions);. U2 C! v0 Q# C
        ! v8 U, X1 P0 @8 ]) I
    return this;4 r  z; ^) h# w( T+ ?! K' j6 L; c
  }
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