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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:
: T9 p) T1 x. r9 b3 O  r$ N
7 D0 b, N1 E1 t. e public Object buildActions () {
6 o2 i4 f3 E! L/ _* w1 b1 D    super.buildActions();
$ e- N% i! _  C1 Q    8 C7 O+ c+ u, t/ m7 F
    // Create the list of simulation actions. We put these in
6 |& Y( G# k( F* I, k" b    // an action group, because we want these actions to be6 h4 @8 c& @, D( Z' j
    // executed in a specific order, but these steps should
$ z% F( Z* b3 r0 v4 _  {$ Q$ Q    // take no (simulated) time. The M(foo) means "The message
5 B) b. B: L% t8 r5 i) W- y9 i    // called <foo>". You can send a message To a particular+ |. q) v7 V! w3 h
    // object, or ForEach object in a collection./ k" K+ [+ _% K, V- N  r- j9 W+ }
        
& A- w# N% A3 }* p$ ~* V    // Note we update the heatspace in two phases: first run
9 `; G* t$ \5 S( M) r    // diffusion, then run "updateWorld" to actually enact the
' e& O  g+ _7 [8 r* i" m    // changes the heatbugs have made. The ordering here is
& S9 S5 z8 T& g9 t- A+ f6 e    // significant!
) R5 K: I( L- H# o6 @' `        
1 ?$ K- \+ r& m7 Q    // Note also, that with the additional
- [8 a0 u) j2 R( ?    // `randomizeHeatbugUpdateOrder' Boolean flag we can
$ `. \! r; Y/ T6 P    // randomize the order in which the bugs actually run+ d0 Y/ v8 y. [; ^- M, |
    // their step rule.  This has the effect of removing any
! C6 W% E! r. t% o    // systematic bias in the iteration throught the heatbug
+ G2 @$ @; l# }& [    // list from timestep to timestep& j9 e% w  T- |8 H( q
        : P0 J$ n9 x5 F8 V) \% w; ~  N
    // By default, all `createActionForEach' modelActions have) k! Y; T; ~3 l* R) ^8 B6 J
    // a default order of `Sequential', which means that the3 E$ q, H! M  l
    // order of iteration through the `heatbugList' will be
( z6 J" k4 M% S4 w    // identical (assuming the list order is not changed
" z' B6 J: L& G' G+ r    // indirectly by some other process).  E$ Q3 h/ t6 Q3 B- g
   
! o6 f8 O3 S* d& T) K; b5 Q    modelActions = new ActionGroupImpl (getZone ());# z9 u9 ]% p; w# M$ H
. I3 |  n% D# ^# {2 g. K
    try {
" _; c6 D2 n1 o9 j      modelActions.createActionTo$message& [. t. x7 y( G  I4 `4 Y: `
        (heat, new Selector (heat.getClass (), "stepRule", false));
2 s/ T6 H2 X, j2 ]  T1 A2 k( D( j    } catch (Exception e) {
; d9 c' K* g; W) W# H      System.err.println ("Exception stepRule: " + e.getMessage ());
. J: O3 h- z5 n" N, u' l1 k2 C    }9 l- q4 {% u6 a7 I( h1 j4 S

- E5 A, X1 g" O$ I+ E7 V7 X; n! N    try {
$ b% N$ K$ R8 a      Heatbug proto = (Heatbug) heatbugList.get (0);
; @0 ?. c) K4 k0 F) }      Selector sel =
# x, ~/ n) v" Q( j        new Selector (proto.getClass (), "heatbugStep", false);( q& K: I, g5 ^* }5 a
      actionForEach =! D5 F" U- n( l. M
        modelActions.createFActionForEachHomogeneous$call
/ n3 P8 f! j7 p, r% Q        (heatbugList,
+ u7 P* q7 P2 n- R+ l- v         new FCallImpl (this, proto, sel,
! s( w4 B( K/ H                        new FArgumentsImpl (this, sel)));
7 A$ e# S5 k3 v. h' M& w    } catch (Exception e) {
  Y- r6 j# c! C1 N      e.printStackTrace (System.err);& O& H3 W' d! w& P+ h2 b6 g; w5 {
    }# @8 V8 D! ]- y* k( y% M# y- a$ b
   
8 T5 k7 g1 A7 Q- z! d# X8 V    syncUpdateOrder ();+ x8 m% W" C+ [" b

+ X( y; |# Y! D4 l5 _    try {
+ G$ W; @- C; A' }, y# a: d      modelActions.createActionTo$message " K+ d2 _' W; V$ }, d' f" p
        (heat, new Selector (heat.getClass (), "updateLattice", false));
6 k; e4 u5 Q" l3 P  o    } catch (Exception e) {! D, c1 N7 j  j) _5 r# m
      System.err.println("Exception updateLattice: " + e.getMessage ());
( s0 W( ~# l$ ]5 p; g9 b    }
7 b, {4 Z6 U1 S' W+ Q" K        
! v; A1 S7 Z1 A- \0 r' I    // Then we create a schedule that executes the8 {/ W5 \& u# Q7 J/ o/ N4 a
    // modelActions. modelActions is an ActionGroup, by itself it1 S* l1 v8 Z9 j: {
    // has no notion of time. In order to have it executed in
6 R2 I2 H8 x+ K; C    // time, we create a Schedule that says to use the: M$ Z; @7 k$ e& G4 J, U/ d% s. g
    // modelActions ActionGroup at particular times.  This
1 x/ v; y# c7 e3 _9 r7 T* Q    // schedule has a repeat interval of 1, it will loop every
9 o: ^8 r/ v1 Y6 W9 y6 H    // time step.  The action is executed at time 0 relative to* j) o4 K9 U1 U' B1 ?* x
    // the beginning of the loop.# M# m& D) L: U8 _' Z

' H! d; C1 o- @$ ~2 L$ g    // This is a simple schedule, with only one action that is& E) }9 A; _; z* s/ ^3 D6 R
    // just repeated every time. See jmousetrap for more- j3 \/ P4 T- C( R6 j8 e
    // complicated schedules.( B( d8 T& u. l; T7 t, H; T! ?
  
) P5 R& b2 I# u! ?" u  x5 C    modelSchedule = new ScheduleImpl (getZone (), 1);. e/ M2 R5 n% z$ D# P2 i
    modelSchedule.at$createAction (0, modelActions);
/ u8 j  t) o/ H( K        6 T! `6 y; v$ ^
    return this;
; O3 \7 }( k( I  }
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