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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:4 \  j  |' W, e5 S

) I1 Z' v! l3 B public Object buildActions () {
) @3 A0 h3 Z, p/ m1 f6 l    super.buildActions();0 Q6 R* D9 e+ }4 {3 w) G
    $ q  C4 W5 a. H+ @; W
    // Create the list of simulation actions. We put these in7 S) t( ?% O5 _; @3 g& J% y( i
    // an action group, because we want these actions to be) Q% ?3 L1 y$ n
    // executed in a specific order, but these steps should9 ~% F7 c7 O5 x8 C: x
    // take no (simulated) time. The M(foo) means "The message3 b2 O3 a7 s2 S/ ]
    // called <foo>". You can send a message To a particular* d/ }# `2 b4 I3 T  x3 g; d
    // object, or ForEach object in a collection.
9 l5 s" \: `" v! X        
; F7 k& n0 h# f3 g    // Note we update the heatspace in two phases: first run* y( N& `# }! w& e( P
    // diffusion, then run "updateWorld" to actually enact the
2 f- m+ ]+ C- z9 }! o+ p    // changes the heatbugs have made. The ordering here is' ^- h+ d8 X1 j7 \: b, c. z& w
    // significant!& R/ j. H  N6 a& @9 k9 |- K
          p+ f8 i, k6 [; _; j: {
    // Note also, that with the additional
5 Z$ h' C& n! l9 X  @    // `randomizeHeatbugUpdateOrder' Boolean flag we can" k- \8 z& E: U1 N6 [9 o
    // randomize the order in which the bugs actually run$ _* _) k! t! ]# p: m
    // their step rule.  This has the effect of removing any
  Z+ h. c6 e/ Z; O    // systematic bias in the iteration throught the heatbug
! [7 B. r6 f' ^5 M5 O" ]    // list from timestep to timestep
8 D1 x; j% C% ~% ?        
8 i/ C9 C, V# N. t9 c  n    // By default, all `createActionForEach' modelActions have; h1 F' S) s) r
    // a default order of `Sequential', which means that the0 g- e- c$ W+ I
    // order of iteration through the `heatbugList' will be
* @) c6 ?7 X$ I7 l: c( I    // identical (assuming the list order is not changed8 h: `9 [9 Z/ w* r7 k
    // indirectly by some other process).
/ ?1 Z6 ^, ~6 y   
1 Y# t9 ?3 x0 J! _, P    modelActions = new ActionGroupImpl (getZone ());: F, r* b6 }) @2 N! o
  b+ h& x6 Y6 Z" z; S
    try {5 A7 I/ X: N* B  f* f! G5 z
      modelActions.createActionTo$message8 p9 F' s. i; w& h: l; ^
        (heat, new Selector (heat.getClass (), "stepRule", false));" L! Y# V! R$ X/ J9 R" n
    } catch (Exception e) {, w) B$ Q1 n* o, w% C2 }. W
      System.err.println ("Exception stepRule: " + e.getMessage ());& B7 S, i1 z: b1 B) g0 f* C8 O
    }' j+ g7 w4 u" H5 c/ \  E* }3 a

+ _& l& C7 P' }( V# s0 u    try {
' K: V; z2 ~4 a- q1 ]* r: G$ `- c- r0 q      Heatbug proto = (Heatbug) heatbugList.get (0);
' Z: K) z- F7 G0 |0 J) O      Selector sel = : G; ~. z% y* [8 \$ C0 V
        new Selector (proto.getClass (), "heatbugStep", false);" M# c" m: e2 D" b9 w
      actionForEach =% c3 D( w* q) L& w4 R* h3 t/ Z. M* n
        modelActions.createFActionForEachHomogeneous$call
1 ]8 G. q6 P, f9 H        (heatbugList,
7 \$ f( c9 \: X# ~. P         new FCallImpl (this, proto, sel,
. m6 A4 s2 B. c3 K7 J0 V                        new FArgumentsImpl (this, sel)));+ A- C( E7 O+ ]" i* K8 v
    } catch (Exception e) {
: E- j6 I4 q+ Q" I. p      e.printStackTrace (System.err);; D2 X, B; J" a/ u9 M
    }" u) G! p) \# I. e( [& v! B, G& N
   
2 p, z- y5 b3 o, c3 g/ z+ E" d& b3 K    syncUpdateOrder ();. F( F! ?9 Z# J# I( @

8 D- x6 B! T8 u    try {
9 N7 b/ b  J& v2 m& H& ]      modelActions.createActionTo$message
' i: @# ^$ p6 `$ l( Y        (heat, new Selector (heat.getClass (), "updateLattice", false));
' v3 Z; K+ _  q1 g5 H, \( y    } catch (Exception e) {. g# ^, X, K1 T0 J7 j/ y
      System.err.println("Exception updateLattice: " + e.getMessage ());
4 t0 S2 Q! T" ^0 F; b* o0 p    }
$ s4 y- E( m$ }) {/ @        
0 ~  O- N# \: q    // Then we create a schedule that executes the
7 x- N/ s, R4 D    // modelActions. modelActions is an ActionGroup, by itself it
1 U1 Y+ l$ c: Z8 o    // has no notion of time. In order to have it executed in# i) ~2 g  x% ^" v6 ?. L& M0 Y
    // time, we create a Schedule that says to use the% e% }' C  O/ Z1 H$ n+ y6 D: N
    // modelActions ActionGroup at particular times.  This" }. I8 ?- e: ^" H0 F) P2 f' ]3 h
    // schedule has a repeat interval of 1, it will loop every
. o; {% R! n/ w' ~1 M    // time step.  The action is executed at time 0 relative to: @7 r3 o- w2 ^* E
    // the beginning of the loop.; [+ b* a7 h- }* M, v9 g1 y* U

9 D# R: V+ K% V, k( e# v    // This is a simple schedule, with only one action that is6 d( k" ]% Y2 \$ z% w' K& @9 v
    // just repeated every time. See jmousetrap for more# N8 L) B$ Y) C. [# G
    // complicated schedules.; F4 ~2 y' I3 ?' z8 L, K8 f, R
  
% s2 l+ W$ Q" D. j3 s( D- M& ~( E    modelSchedule = new ScheduleImpl (getZone (), 1);
' v' ~' U7 p5 w7 q1 `" n, S6 Z    modelSchedule.at$createAction (0, modelActions);' \' B& m2 n. b$ I) c4 J8 N
        
& Q2 u/ V% |5 n% k9 ^    return this;
4 X5 U2 ?- j' ?/ G+ p  }
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