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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:$ [* x2 j3 x* n! c+ Q

2 C5 k- b; _. n0 F8 B" X public Object buildActions () {! B5 \4 q0 L3 l  ^' ?  B# ?) w
    super.buildActions();/ V0 ~5 w  g% h% k) ]$ K7 d  A
   
1 C; p) Y& J1 ]* Y) q( q+ d    // Create the list of simulation actions. We put these in
( k2 j5 Q/ I0 Z. F    // an action group, because we want these actions to be% ]* q. G2 w; [) K+ [$ I# e  L7 G
    // executed in a specific order, but these steps should
. E9 d. D* i% O; Y( c- Z+ s    // take no (simulated) time. The M(foo) means "The message' U+ A8 Q: @1 _( b% W8 D' P
    // called <foo>". You can send a message To a particular
- x# u2 x5 @% G    // object, or ForEach object in a collection.$ b5 ]5 B0 d, }7 x# j6 o) k
        
( I$ B; N7 E/ k: o' [    // Note we update the heatspace in two phases: first run' D' G2 u  S- S
    // diffusion, then run "updateWorld" to actually enact the$ r% K# t' c/ A% s* E/ i% v
    // changes the heatbugs have made. The ordering here is1 R7 s, k! L: ~% V% L9 @6 k# j
    // significant!0 p' o8 y1 v. b2 ^
        
4 o1 O7 U( `5 @2 H+ h- t5 Y4 k' }    // Note also, that with the additional3 e- q5 H) Q! H' T0 T
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
) J+ f, g* S8 H' u6 k, l    // randomize the order in which the bugs actually run( X( {; O! N% x5 f% |: I+ q% c
    // their step rule.  This has the effect of removing any
5 D: `6 I1 e0 V, f    // systematic bias in the iteration throught the heatbug
  O* D/ n# P+ S9 v; Q    // list from timestep to timestep0 V  K/ C2 @/ L; Y
        ; R- j5 T/ m  i
    // By default, all `createActionForEach' modelActions have
6 Q2 D$ ^2 G* d' w& |/ a' g    // a default order of `Sequential', which means that the
4 x9 g  W+ L+ Z    // order of iteration through the `heatbugList' will be& p( G. `4 I1 L) `# D
    // identical (assuming the list order is not changed' D/ @/ I* b+ B) |& K' k! a0 X
    // indirectly by some other process).
1 O, q4 G4 I0 q! D    5 z" E1 v; S% B! Z
    modelActions = new ActionGroupImpl (getZone ());
: E/ z! m& t' J4 o- }* M4 H
8 C6 m$ [# l: A" H    try {6 s, h" r- }* q1 d
      modelActions.createActionTo$message3 U8 A' D, F5 E' O5 V0 \
        (heat, new Selector (heat.getClass (), "stepRule", false));) ?0 f  |7 i$ E- d
    } catch (Exception e) {
5 N, G8 Y% ^. o      System.err.println ("Exception stepRule: " + e.getMessage ());9 a5 S  L3 M" v( G; b0 w: T: b
    }2 S( Z1 W/ W* S. |3 W
$ M  i/ h  ~1 Y
    try {
) I* p' q% x& F5 @3 w      Heatbug proto = (Heatbug) heatbugList.get (0);
! X3 w$ d/ I, g/ f0 T; V, k' @      Selector sel =
0 f% h) c* g) I7 f        new Selector (proto.getClass (), "heatbugStep", false);& ^( |" d$ ^# Z
      actionForEach =  ^: ~: I* l, }# B8 s
        modelActions.createFActionForEachHomogeneous$call" I  o6 P+ }' \( h+ N( \
        (heatbugList,
, L( m* _- X4 D! B% H: Z         new FCallImpl (this, proto, sel,
0 l/ i- A; x7 Y, \. D, M                        new FArgumentsImpl (this, sel)));
4 M4 S7 D4 J$ D; d/ q. m    } catch (Exception e) {% Z9 m) j# A, R7 c. ^8 ]
      e.printStackTrace (System.err);
" ~% J' V' u2 g) j2 q3 \    }" Y# v9 c# h& }: P7 J
    2 E. V# I2 H2 I3 H6 ^
    syncUpdateOrder ();" ?0 E1 F0 w# z" _
0 D9 _0 Y  ]. z! e# z# w, {1 ?
    try {& s8 M8 \- n3 t2 E9 l
      modelActions.createActionTo$message % v7 G9 h; H7 Y: V; ~  p
        (heat, new Selector (heat.getClass (), "updateLattice", false));& _) i  E0 W9 f; M2 v6 J# _" Y/ x
    } catch (Exception e) {/ g& Z/ f9 R6 V2 M
      System.err.println("Exception updateLattice: " + e.getMessage ());, {6 v9 g$ K3 l
    }
2 U1 J+ p5 t6 i# ^3 }- `1 r( F        0 |" ]* G  Q! w( n( V" H
    // Then we create a schedule that executes the  e( {* h& F- g
    // modelActions. modelActions is an ActionGroup, by itself it
: N2 @/ H8 Y" M+ k, l1 |( f" [# v& O    // has no notion of time. In order to have it executed in) S8 Q- C5 o" ?* ?/ m* A
    // time, we create a Schedule that says to use the/ Q8 G9 Z1 @, R& ~
    // modelActions ActionGroup at particular times.  This+ _  Q- F' U% u4 a
    // schedule has a repeat interval of 1, it will loop every
7 V  `: g4 p( r- H, `7 K    // time step.  The action is executed at time 0 relative to0 v! C& K2 o; O: t
    // the beginning of the loop.* Y9 D4 M  ]" g2 J
2 s* ]* b  ]9 [% x" [$ t
    // This is a simple schedule, with only one action that is4 I  {# X9 z2 j' r! h% ]
    // just repeated every time. See jmousetrap for more
/ Z: C& Y5 @7 q* S3 }6 _9 Q    // complicated schedules.3 }, K8 z% N$ D" s. Y
  
$ V  \2 W  c8 \& _0 c    modelSchedule = new ScheduleImpl (getZone (), 1);
8 \6 @$ Q# Q" k3 J6 U    modelSchedule.at$createAction (0, modelActions);4 o$ T/ N3 F6 i! L. |- D5 r/ M
        
9 j, F9 H. h. f2 ?  C, ^2 f( j    return this;
4 {  g6 p9 T: T) W6 ~, A# L8 b  }
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