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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:# K" ^! m+ Y- @
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public Object buildActions () {6 T. S: c/ U4 x  s1 p. `8 D! \
    super.buildActions();0 i$ Y. M8 s5 i1 c8 a
   
' F! V1 o$ K: G& B1 T* h! g, i    // Create the list of simulation actions. We put these in' P% [% D7 Q) H  g% ~
    // an action group, because we want these actions to be
7 R5 u9 L$ J9 K4 C    // executed in a specific order, but these steps should
2 e. q) A9 |( d% r6 v) z& W    // take no (simulated) time. The M(foo) means "The message9 u( t; C+ }& U5 ~/ _: w
    // called <foo>". You can send a message To a particular9 R; o( S  q- L/ [/ O  D+ ]7 o
    // object, or ForEach object in a collection.# f$ H# _2 R, ^+ o4 p
        
2 [& i# D3 L, N0 _    // Note we update the heatspace in two phases: first run0 q- |! m3 g% b$ u: v6 r$ x* l1 N
    // diffusion, then run "updateWorld" to actually enact the
# t) s7 J7 j, p9 d    // changes the heatbugs have made. The ordering here is3 L2 t- v0 S  L
    // significant!4 U# R$ Y- ?$ d3 R# K  z& E
        # D1 @: w7 j) L5 l" x9 K7 Y' u1 v
    // Note also, that with the additional5 D  t2 _  j( j$ ?, s9 j- G0 a$ G
    // `randomizeHeatbugUpdateOrder' Boolean flag we can- W& _0 S( }. q
    // randomize the order in which the bugs actually run
7 i! p! C( |% s* q" i7 x+ a, \    // their step rule.  This has the effect of removing any
1 m& D+ ~$ Q. y6 T# }2 @# v    // systematic bias in the iteration throught the heatbug7 \9 Q1 _7 W3 ]& O
    // list from timestep to timestep
, y$ o0 D& s; K. D- O  z/ W        
- M7 s% T  C( p4 d    // By default, all `createActionForEach' modelActions have- \% N1 E# p9 u! B+ `* E) B
    // a default order of `Sequential', which means that the* i; N; D/ @% e% V# h7 C) C. a/ l
    // order of iteration through the `heatbugList' will be
" M2 n) D* U/ U  }/ n$ U& u' ~    // identical (assuming the list order is not changed
* G% ^6 B: ^1 I1 y    // indirectly by some other process).- j* `1 }  t& t! [  f. K
    $ X- L% [# Z( }; E; x! R0 @
    modelActions = new ActionGroupImpl (getZone ());
/ g7 H3 I/ W3 W! J
( ?& w" S. J3 ^  |$ E  j1 y    try {
9 z) r7 j3 M/ ~. }      modelActions.createActionTo$message
# Z! _7 i5 F+ }5 S3 E        (heat, new Selector (heat.getClass (), "stepRule", false));( S- X. y/ V7 r) _& D* m" X4 U
    } catch (Exception e) {, n! f- ]- k& p/ i/ d% F. U
      System.err.println ("Exception stepRule: " + e.getMessage ());
+ E; Y, ^: h, ^) M( M    }
8 W  M. \! q; @% e7 D6 ~+ c2 `1 y% v) z  E
    try {9 Y$ V1 F* Z* H) G: p/ r, Y' o6 V& _
      Heatbug proto = (Heatbug) heatbugList.get (0);# p7 c* Z0 B0 R7 T
      Selector sel = ! H3 ], k8 h! u0 x+ Q
        new Selector (proto.getClass (), "heatbugStep", false);
/ h4 u( Q# F3 x) X      actionForEach =" W3 L  ^, N  K8 U. m
        modelActions.createFActionForEachHomogeneous$call; H/ r# {* v  I. s
        (heatbugList,# ?0 M1 o7 w+ s. `  F
         new FCallImpl (this, proto, sel,' i& y8 A$ M/ O6 h5 f! o
                        new FArgumentsImpl (this, sel)));8 o: ?: q) H  t; T8 z' A; D- ~0 t8 n
    } catch (Exception e) {3 S& H# \, D. y$ Z% i3 i
      e.printStackTrace (System.err);. @  F' f& k; B& ]% ~
    }! H, ?; |' Y. m7 X+ {4 S1 |/ n4 y
    ; A* Z/ D# h% w
    syncUpdateOrder ();( V( N, H( y$ d5 f2 o2 P  }! O5 H2 \

& z% z$ g$ t4 J$ g5 p    try {7 z& Y$ t( o7 @. @; h) X  ?
      modelActions.createActionTo$message
5 D. V4 u5 G9 @( a0 A        (heat, new Selector (heat.getClass (), "updateLattice", false));
8 [3 C: E3 x* \" G" T& P) F    } catch (Exception e) {
$ \+ T3 J3 G' v8 I. U4 A* ]3 y      System.err.println("Exception updateLattice: " + e.getMessage ());
& }; i; Q7 p8 o  H    }
; M1 H& K- l( @) H. ^4 i: M        2 k& f- R9 \; m- G2 C" V' y
    // Then we create a schedule that executes the8 D5 ?7 k% m' Q1 z' w+ J; s4 V
    // modelActions. modelActions is an ActionGroup, by itself it) `$ f- C0 a  d5 p& E
    // has no notion of time. In order to have it executed in
3 |9 W$ v) a0 f% U  R    // time, we create a Schedule that says to use the3 U2 W. W' R. Y) s! O6 H
    // modelActions ActionGroup at particular times.  This/ b) c6 V6 R- E! c; l
    // schedule has a repeat interval of 1, it will loop every3 n+ K2 v( k2 n4 r
    // time step.  The action is executed at time 0 relative to
' _$ A7 l/ W% J- ]3 E) N    // the beginning of the loop.
0 {! p2 b, |7 M3 D% [: S
, Y( ^) _/ b' i6 w    // This is a simple schedule, with only one action that is
9 w& @- E+ }3 q$ X  A! J    // just repeated every time. See jmousetrap for more
. m6 m  h3 v  y- y" F; z    // complicated schedules.
# J1 Q3 U) @' L. O0 t6 }& T  $ N: o' C8 S# j* X
    modelSchedule = new ScheduleImpl (getZone (), 1);% ~( F4 ]+ e1 `- n+ y! r
    modelSchedule.at$createAction (0, modelActions);
0 i1 i% {+ ]: e$ x0 q/ S# m        
  o$ b$ W1 H2 K6 |; `! E) {' U& g    return this;9 U' ]7 U# i" R) z
  }
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