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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:* q, E# }+ w7 ^6 m+ D3 p( }
! P; _' X/ o2 G  c$ X) j2 \6 n, }
public Object buildActions () {
* L& p3 W+ w8 `: n' e1 E- [! F    super.buildActions();6 d, f6 R2 N6 A& I
    ( O7 F5 l# r  U9 n; E. H3 P
    // Create the list of simulation actions. We put these in' A9 ?: [( M1 Y5 Z) _% N4 ]4 U
    // an action group, because we want these actions to be0 a' X2 G: J. ^. Z
    // executed in a specific order, but these steps should' r- g3 P, N7 I. q
    // take no (simulated) time. The M(foo) means "The message
# j: `1 O8 t0 L! |4 V, }5 S. q! T    // called <foo>". You can send a message To a particular
: i. p/ ]2 c0 G6 O; A* _0 a* W    // object, or ForEach object in a collection.
4 `2 N9 J3 g7 D9 v2 K        % t8 ?  b$ y( i: A. ?) m" f( x4 s
    // Note we update the heatspace in two phases: first run
' u5 K" R6 V: L0 [+ f    // diffusion, then run "updateWorld" to actually enact the& E1 i( L7 o7 X" E
    // changes the heatbugs have made. The ordering here is2 p0 a( ?/ W* J$ [& y5 p
    // significant!
0 e3 ^1 x* o$ K) Y* j9 p        ! x, |7 P$ t) o
    // Note also, that with the additional
' t2 [' h9 j  i( M& u  H3 i    // `randomizeHeatbugUpdateOrder' Boolean flag we can
, p+ q! Q8 V: w$ l) O$ ^    // randomize the order in which the bugs actually run0 I2 s7 E* C1 s, Z
    // their step rule.  This has the effect of removing any) N7 K9 W( D" m: g' c/ o5 M8 s8 s
    // systematic bias in the iteration throught the heatbug
7 L3 _0 i8 c8 {    // list from timestep to timestep
$ P* O% ^2 r: ]8 `$ m) D8 q7 i" I# i        
& D, q1 ~% L  H/ \* J; C    // By default, all `createActionForEach' modelActions have! M* B9 ~9 k& E; c8 W6 Q# N  w
    // a default order of `Sequential', which means that the
8 [. T4 {1 C1 [    // order of iteration through the `heatbugList' will be' D7 t6 M; c* g$ d2 Q! K6 a6 z
    // identical (assuming the list order is not changed# C6 `* K# o. a) @
    // indirectly by some other process).& ]( c7 x! c& h4 R
    0 W/ o, R! G( r* @& f
    modelActions = new ActionGroupImpl (getZone ());4 g) O+ w/ X6 }7 n
' z# y' i3 o$ }3 ]
    try {6 v$ X2 E& S: L8 Z6 t
      modelActions.createActionTo$message
. Q8 p7 I% k* _4 s; z& c( F! B        (heat, new Selector (heat.getClass (), "stepRule", false));
$ m2 C: |2 R% T( e! t    } catch (Exception e) {
$ p& X. j8 X: V% v' h      System.err.println ("Exception stepRule: " + e.getMessage ());
2 N( T3 `! T# Z+ g4 Y- Q; O    }+ D5 i9 z; r. z8 O7 y

+ l. z1 N# Q5 d! g; A9 N5 G    try {0 ?8 _) g. V' D# ^( ?; G
      Heatbug proto = (Heatbug) heatbugList.get (0);
7 h  ^( P! ]  y2 L  D      Selector sel =
' W/ l- H3 h& s' ?        new Selector (proto.getClass (), "heatbugStep", false);9 [+ X6 B& U4 X2 k2 I3 O
      actionForEach =
. ^- B3 O# f# T7 }2 P8 e2 z        modelActions.createFActionForEachHomogeneous$call2 S1 b7 _& I9 j' u; H& {& j
        (heatbugList,
3 \, \, k3 _1 O: h         new FCallImpl (this, proto, sel," R9 H3 j! `% [& r1 Q
                        new FArgumentsImpl (this, sel)));
& i' A( l" P  p6 \% S1 O    } catch (Exception e) {; y) m9 m8 j0 Q" L  g2 C6 ]
      e.printStackTrace (System.err);
; z8 l( X: w2 D    }6 L# ]  b/ F0 k3 q2 o# h. B( U$ h
   
# `$ J3 z8 X: j- h, C& C4 L) Y    syncUpdateOrder ();2 _8 C% v8 f2 l. l, X, G1 l

! \- f, i8 B% F6 C    try {
7 q4 \6 l0 f# {      modelActions.createActionTo$message
* c1 ?' i' k4 }/ Z' i& R        (heat, new Selector (heat.getClass (), "updateLattice", false));
+ S; r  E. a$ J# [- l0 g( Z    } catch (Exception e) {
" y9 {( ?" _2 _+ T0 a, f      System.err.println("Exception updateLattice: " + e.getMessage ());
/ U8 {3 ?% R" O    }
/ u6 @+ U7 t0 n; L, ?: u" @        . J  ~& z1 L" F
    // Then we create a schedule that executes the3 s- s. s' |! Z8 S1 y
    // modelActions. modelActions is an ActionGroup, by itself it7 w4 w# L  U# h( o
    // has no notion of time. In order to have it executed in8 j, u7 c0 v" T+ F; ^
    // time, we create a Schedule that says to use the* S) Y! F% x) d# M- {7 e: x( f: P# K
    // modelActions ActionGroup at particular times.  This( v; N8 U. V- E
    // schedule has a repeat interval of 1, it will loop every
) l* n# n. |2 f! e0 s$ n    // time step.  The action is executed at time 0 relative to
  p9 q  c5 x! I# f1 v+ ~3 ]$ W    // the beginning of the loop.
+ P' r, x6 \' X/ `1 c2 G- f- D
2 A" ~4 Z4 D! L+ i! [- [    // This is a simple schedule, with only one action that is
! J- Y8 }3 M8 I2 H    // just repeated every time. See jmousetrap for more$ ^. R# u; ^: ?8 K! U* \8 f
    // complicated schedules.
# u- Z7 ]+ \# A2 ^8 m, v! e1 |$ L  ) }4 M0 }( x/ g  H) B1 R4 `4 @
    modelSchedule = new ScheduleImpl (getZone (), 1);
  F+ M$ ]1 ~5 n, o: H    modelSchedule.at$createAction (0, modelActions);
; n9 t  B3 [7 Q' M        1 Y/ x/ l# g. R+ w1 P+ p
    return this;
6 \5 h) L8 ~1 U8 C  }
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