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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:
5 ~0 N" B2 _! M2 |' X
! |4 g' t, R9 Y; u+ O1 s, |1 t public Object buildActions () {
% [. H& [7 M5 f" L0 [6 l4 ^, B    super.buildActions();
$ I& n3 F* q- b# W+ M& F   
* B6 d) P( L# K8 r+ Q; e! X    // Create the list of simulation actions. We put these in
6 _8 d) o, r# _8 Y8 ]# N! W) Q    // an action group, because we want these actions to be5 Z. |. g! U) _3 Y# ~, c6 R
    // executed in a specific order, but these steps should
% n6 S& J2 f6 m1 B9 _    // take no (simulated) time. The M(foo) means "The message
, |2 \% o2 _: r# J+ K! |: T    // called <foo>". You can send a message To a particular4 z& {5 v. {& u# O( n) X/ c7 a# A; O
    // object, or ForEach object in a collection.; N8 i) S( Y3 e6 `0 o- R
        2 f  a! g' H! Z. m
    // Note we update the heatspace in two phases: first run) \. |, ^" B( C, b
    // diffusion, then run "updateWorld" to actually enact the  B/ p8 R: d  j- q
    // changes the heatbugs have made. The ordering here is
; U' E/ I2 d9 b    // significant!* ~! o% B7 ?6 E- }. m! a6 e
        
5 I. a6 T# `$ \' i3 N5 M: A    // Note also, that with the additional- w8 {: ]- i& b& B
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
$ `' A4 R  ~% S/ F    // randomize the order in which the bugs actually run( `9 f, Z) n4 p" o( k! X$ M$ O! D
    // their step rule.  This has the effect of removing any
8 Z1 R8 a( f- T- u+ v9 q5 p    // systematic bias in the iteration throught the heatbug
0 O. d' z  w, z$ f% p    // list from timestep to timestep" l5 a5 [$ X8 I1 A  z5 V, ]+ q
        
* `* ]" b8 Y7 b2 T, f6 p0 k    // By default, all `createActionForEach' modelActions have' X$ g3 R. [# }( z& Q- _3 U. f+ E/ y
    // a default order of `Sequential', which means that the( C/ u  T6 U& n1 a8 w2 R- U+ L
    // order of iteration through the `heatbugList' will be
2 q; H+ h1 ?1 j1 L1 D0 w9 g8 I    // identical (assuming the list order is not changed
2 d, f# E! R; u' b8 W% m: o    // indirectly by some other process).3 Z1 h: y9 M# K) u0 k
   
* j5 t+ S! c1 D    modelActions = new ActionGroupImpl (getZone ());+ u8 _6 B6 [- l- S/ M" r

: ?8 z  K) u  u6 [9 J1 h    try {8 M5 |4 y3 {& p4 C: A* D
      modelActions.createActionTo$message
9 h( s$ s1 t& Y& D        (heat, new Selector (heat.getClass (), "stepRule", false));
/ i& K+ o5 G1 ^5 q: u- Y) H0 x$ X( o# ]    } catch (Exception e) {
3 }4 j# i% ~7 v9 V# n! y      System.err.println ("Exception stepRule: " + e.getMessage ());
8 Z" _7 [  U: L) @    }
2 O: Y$ P& Q8 e# A9 z, C+ Y9 k/ Z1 Q0 m. |2 V- S7 H. A
    try {- m0 U9 j3 @8 a! y; |0 N6 _+ m
      Heatbug proto = (Heatbug) heatbugList.get (0);
: ~& s( }# @& s; Z5 x+ T0 I      Selector sel = % Z* u9 M" J8 \! W8 J
        new Selector (proto.getClass (), "heatbugStep", false);
& i3 w3 j8 x. u! L      actionForEach =; V$ V$ H- t+ _; s5 F
        modelActions.createFActionForEachHomogeneous$call
" |1 _2 N9 |6 r% a        (heatbugList,
0 }, D' U$ o/ H# ]3 R3 p7 S5 h         new FCallImpl (this, proto, sel,! H5 G8 ~7 Q# s8 \) M4 N7 P
                        new FArgumentsImpl (this, sel)));
7 x/ w5 }% U4 E    } catch (Exception e) {
5 y' A) `$ R8 u: G; S( |      e.printStackTrace (System.err);% [; [8 ^+ i) |
    }$ f# v, Z$ p# q' c& p
    5 `1 d" s5 ^* b7 X" _
    syncUpdateOrder ();
) X( B& R! K) i1 r- _1 N( V1 ^3 N% }3 _. r
    try {8 M/ U# {' q, F/ J
      modelActions.createActionTo$message 8 i# e/ R/ b7 ~9 r3 e$ f3 l
        (heat, new Selector (heat.getClass (), "updateLattice", false));* [; S" D0 S& C
    } catch (Exception e) {' B& b8 t/ Q& A
      System.err.println("Exception updateLattice: " + e.getMessage ());# V9 v# G$ R2 C, z
    }
% J& T) {* P7 q8 G5 j1 E! `( ]$ T+ W        ! H$ S1 m8 Y$ J+ r" D
    // Then we create a schedule that executes the
6 ~( y) @: e5 d+ j: B' [/ T4 P    // modelActions. modelActions is an ActionGroup, by itself it
) K7 u0 a9 v$ U/ ?; M    // has no notion of time. In order to have it executed in( O) r& X. I( ?8 Y# V6 P0 d8 W
    // time, we create a Schedule that says to use the
5 l& t  H4 S* P0 t7 i    // modelActions ActionGroup at particular times.  This
# O7 I0 |. K5 ]5 P    // schedule has a repeat interval of 1, it will loop every3 V( ]; N/ R! h: I8 A
    // time step.  The action is executed at time 0 relative to" `1 v8 h' _9 i) t( c0 h' a
    // the beginning of the loop.* s4 k7 G% j# V4 ]( ?
; W1 r( B4 f* g7 y: C/ o
    // This is a simple schedule, with only one action that is- D8 C' F2 u- ?' w7 v8 N& b
    // just repeated every time. See jmousetrap for more
$ Q% u+ b/ x/ E/ I) e    // complicated schedules.
% J, @; n) T0 G, w) @! p: X4 @# h4 y  / A6 [2 w' q+ l1 W: T" f% V7 Y
    modelSchedule = new ScheduleImpl (getZone (), 1);( d5 }8 y8 Z/ h7 y
    modelSchedule.at$createAction (0, modelActions);! v2 z2 @; e3 [- c$ a* Z( l1 a/ U
        
  M  u: O$ Q$ v  f( k    return this;  Y6 H( T' @- x/ n
  }
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