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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:
0 J8 }+ a2 r  f  k% t4 E& g6 x! A# v& Q0 Y. W; |
public Object buildActions () {
/ l3 v: M( {& E+ C# Q; Q    super.buildActions();
" ^8 V6 W# J+ ~$ t7 x3 \+ \# w   
( ~9 ~8 s& ?5 a0 Q    // Create the list of simulation actions. We put these in( Y. {2 {5 h! L+ d' m" J. k
    // an action group, because we want these actions to be
! ]/ A& H: R, g    // executed in a specific order, but these steps should' i8 J, Z) o4 B7 ]! q. X! j, Q
    // take no (simulated) time. The M(foo) means "The message+ W% A2 z* \. Z5 @
    // called <foo>". You can send a message To a particular6 ]3 @+ z( u3 y: _6 [; U
    // object, or ForEach object in a collection.
0 n8 Y+ o, Y- F: w' \" `7 l& @        $ Q7 B9 W, H6 F0 H$ O! C
    // Note we update the heatspace in two phases: first run: w& A/ V3 v: I) ?) W& H% ~& T
    // diffusion, then run "updateWorld" to actually enact the
$ Q+ ^9 o. r, J  e2 x    // changes the heatbugs have made. The ordering here is( W: m) R- Q7 ^' C$ d6 d2 Q, k
    // significant!
. @) ?( L* B2 ^- w6 s        
' A) {( ^4 c' _/ ?    // Note also, that with the additional
) X, h  v" o- A    // `randomizeHeatbugUpdateOrder' Boolean flag we can  l# N1 e. A& `
    // randomize the order in which the bugs actually run$ G; }8 F# v/ M9 H8 W
    // their step rule.  This has the effect of removing any
" b9 i7 Q( c! f7 [    // systematic bias in the iteration throught the heatbug
: q' n* N: L0 ^7 Y    // list from timestep to timestep
% W9 S. m; a3 g( Y1 }+ ]        
+ c: M2 P+ Q5 Y    // By default, all `createActionForEach' modelActions have; Q  `! z, D( X3 h! v. v: N5 `
    // a default order of `Sequential', which means that the1 a4 a8 J3 Q3 x+ ]* o* L# J, W
    // order of iteration through the `heatbugList' will be
; s3 r! H$ r# p! `! [0 d5 t& p" i    // identical (assuming the list order is not changed
4 |  A! i. t7 {0 [% P$ ~1 w7 _    // indirectly by some other process).
2 k9 g' o3 K$ ~5 p9 R. ]( a    1 O2 ^& E/ z# I
    modelActions = new ActionGroupImpl (getZone ());7 t# ~$ \/ ~# l! M  o4 i8 R

# ^1 r; k+ C( R3 V* D( f$ m5 v: j    try {6 r0 S0 |. r# l
      modelActions.createActionTo$message9 [; q! J2 s3 |$ k8 e# g( |: [
        (heat, new Selector (heat.getClass (), "stepRule", false));, B5 j/ l* l5 Y; g
    } catch (Exception e) {( g  h) }- x! B7 T) n$ E
      System.err.println ("Exception stepRule: " + e.getMessage ());
# C& d" e+ M. Z    }$ S0 R* `+ n2 p% z  f7 |* U

6 B! B/ x4 |; }5 A    try {, i1 p1 _' c) E$ p* Y  G- w5 @
      Heatbug proto = (Heatbug) heatbugList.get (0);  X5 O  a% T* D9 @  [0 q7 }
      Selector sel =
9 S% C7 l3 L: ]        new Selector (proto.getClass (), "heatbugStep", false);
! [! a( S: U  @) M* v; D& D4 t) \0 B( @      actionForEach =- n" I& O9 x+ e; Y$ r8 p( A% f3 y
        modelActions.createFActionForEachHomogeneous$call
$ j- J9 Y' M7 x& j        (heatbugList,
: {; T9 X1 X. E6 C" G- {8 d, P         new FCallImpl (this, proto, sel,
6 l# q9 h+ ]: [% y4 _. `) T- M2 T4 M                        new FArgumentsImpl (this, sel)));' u3 M. r( ~3 g5 @, z1 A* J: a
    } catch (Exception e) {
4 g& }; d4 f7 B& c      e.printStackTrace (System.err);/ x7 i7 x" h/ s. h4 x
    }9 r6 Y7 K2 b7 p4 }9 t
    3 n# r$ t' H8 b, |3 N0 u9 R
    syncUpdateOrder ();: w; H- `, A$ |/ d/ o2 i" y; j

8 `3 C' {  U4 f& M6 {5 E% S    try {% ]/ H5 _9 s6 J! B
      modelActions.createActionTo$message ! K7 L# _. w5 j/ c+ }8 R& ], i
        (heat, new Selector (heat.getClass (), "updateLattice", false));
) z; s/ B8 I' A  t8 a    } catch (Exception e) {
! n* N5 Q+ Q8 H0 D+ O      System.err.println("Exception updateLattice: " + e.getMessage ());7 H6 D6 ^% ^+ C: {
    }
1 k4 N, R0 {5 r) C7 k        ! t  X- g  c' W8 a
    // Then we create a schedule that executes the
8 x6 o& q! H$ u$ h! u! V8 Y. U% L    // modelActions. modelActions is an ActionGroup, by itself it
' G) O, h" L# ?    // has no notion of time. In order to have it executed in
. f) f4 |1 }5 n  @5 W9 \    // time, we create a Schedule that says to use the- m# q  w, \0 M4 q
    // modelActions ActionGroup at particular times.  This
, ?" G& R1 K" ~- Y    // schedule has a repeat interval of 1, it will loop every
/ Q" @" v' z+ ]( _, @    // time step.  The action is executed at time 0 relative to8 J+ q7 H) S" r3 C
    // the beginning of the loop.
$ S* [) u$ o. ]3 e9 p0 k$ N+ Q6 g1 n+ y& k# K2 d' K2 A
    // This is a simple schedule, with only one action that is
8 Z: T# A! c6 P! z/ V! R0 y    // just repeated every time. See jmousetrap for more7 m! }3 ]  o8 D8 P( k6 v
    // complicated schedules.
6 M% q* W  u+ j1 b  
1 @4 U* [# x+ s# I    modelSchedule = new ScheduleImpl (getZone (), 1);
) m6 y- f5 B1 w1 d  W' D    modelSchedule.at$createAction (0, modelActions);5 T* c9 v" e7 Q9 q0 A
        , s- W4 y+ V" k0 b8 [
    return this;" a8 Q9 J2 G- O$ m; [
  }
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