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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:
! h& B2 r+ w0 f8 x" w8 e
8 S- U) h! H& }* p& t public Object buildActions () {9 C! u3 f. B* t7 ]
    super.buildActions();
) T9 ^9 r* a, `   
$ B2 G. }- [+ L$ O5 d    // Create the list of simulation actions. We put these in
. \  o, v$ `+ l* G  Q  M4 A, [) u    // an action group, because we want these actions to be- H, `0 U$ O' C$ y  _  h: h
    // executed in a specific order, but these steps should2 F- U/ F. r# ~) x
    // take no (simulated) time. The M(foo) means "The message, \7 x9 J! [. z& w
    // called <foo>". You can send a message To a particular2 `( K8 M, ?* R% _6 k
    // object, or ForEach object in a collection.
" `, \$ h, Q7 B' \6 m$ C. r( z        5 V$ \% @/ x& i6 d( Z
    // Note we update the heatspace in two phases: first run: e! d/ j/ y9 G
    // diffusion, then run "updateWorld" to actually enact the5 _$ l) L- Z- b$ a0 V- V9 `
    // changes the heatbugs have made. The ordering here is
6 X% B: R9 y8 F4 F    // significant!
2 E, ?/ n/ r0 N( S+ b( q        
" ~8 K& r9 S. W    // Note also, that with the additional
/ r, P7 Y) f: [1 Y; t3 W* R# v    // `randomizeHeatbugUpdateOrder' Boolean flag we can
& I8 \7 u* W4 H, ?, n8 {& i  Z    // randomize the order in which the bugs actually run1 y/ p2 Z$ S: U
    // their step rule.  This has the effect of removing any; x" L7 v$ _- T
    // systematic bias in the iteration throught the heatbug
) J4 F' q- N2 B' b' \- `6 M; u    // list from timestep to timestep
+ ?7 v! H+ @  i) p$ O' F        8 c9 P! F( G) x( q: w
    // By default, all `createActionForEach' modelActions have4 k" _- C& n1 ~+ F2 p, \- P
    // a default order of `Sequential', which means that the
: ^, p8 ^6 h' }6 W" O    // order of iteration through the `heatbugList' will be
( l7 c' L1 ?5 C; ]+ h    // identical (assuming the list order is not changed
4 Z0 q/ v: l, r1 ~  R+ ^    // indirectly by some other process).
5 x, N0 B$ [3 V2 h% H   
1 `+ V3 K5 B9 V* a    modelActions = new ActionGroupImpl (getZone ());4 l7 o- R- Z% ^) D4 h3 N! F
) _( b) Q: R5 n  T$ ]8 p" J  Y
    try {5 @( Z( P9 [! b
      modelActions.createActionTo$message$ r$ }3 H6 R5 E  L! ^3 g6 k2 p' Z
        (heat, new Selector (heat.getClass (), "stepRule", false));
8 W+ A+ f/ G$ z! t+ m/ l    } catch (Exception e) {9 F9 v1 |' ?! o& K  X% R9 n! F
      System.err.println ("Exception stepRule: " + e.getMessage ());5 {1 z/ E3 o! V% l) ^
    }
0 P5 t) M  o7 U# z
% r4 G9 u! o, O: P0 }    try {' O0 b& E0 s, x( i2 y1 m% `8 M
      Heatbug proto = (Heatbug) heatbugList.get (0);
' I% v1 N$ h1 X. g0 l      Selector sel = . W/ }0 a5 W4 r8 _. m+ H
        new Selector (proto.getClass (), "heatbugStep", false);
& n: U( G5 j1 B' s6 w6 O; S      actionForEach =
# r& _8 G. L( k/ O! n! }, j8 h        modelActions.createFActionForEachHomogeneous$call
, |& A3 J6 u$ \6 |8 u& t* g        (heatbugList,
, q! X. _" u  R) G: D+ P# ?' v% [7 c         new FCallImpl (this, proto, sel,- z- n  Z4 P) w& N( k
                        new FArgumentsImpl (this, sel)));; I  ?4 U6 b' d# s' j5 P3 s& u
    } catch (Exception e) {
1 m: S7 ~$ T3 {! V2 Q7 Z7 R      e.printStackTrace (System.err);! C! E. Z" Y6 w3 l, A
    }
: ~# f0 r, P! _- D( e; y    : z: d2 ?4 F; I9 d+ f+ g) ?
    syncUpdateOrder ();9 z8 g; ?% Y2 b5 @
6 t" z" x2 y3 z6 y0 f: ^2 V* _
    try {
9 X+ q) U/ ^: X1 s- s$ [) y" m      modelActions.createActionTo$message & V9 w. D, [8 s  M: h" g
        (heat, new Selector (heat.getClass (), "updateLattice", false));5 ]2 W5 V* a/ o! T7 w0 u  l
    } catch (Exception e) {+ {. O2 Z5 V3 m1 w+ I
      System.err.println("Exception updateLattice: " + e.getMessage ());$ U$ K- ~% A* |. }% v3 d( [. Y$ F
    }# [' J' a! e5 J3 m6 L
        & Q: X3 [" y  K; z" I" y
    // Then we create a schedule that executes the
; [7 j6 G2 K! Q$ S. `  F    // modelActions. modelActions is an ActionGroup, by itself it
$ T1 c5 c" z# C  G    // has no notion of time. In order to have it executed in
0 X8 g) c9 ]# I* m, R% C    // time, we create a Schedule that says to use the1 j/ b  ~( F8 ^8 |0 l% v
    // modelActions ActionGroup at particular times.  This  L6 {* Z2 V& |$ b! z' m
    // schedule has a repeat interval of 1, it will loop every9 y2 ~1 F" e) ^4 h
    // time step.  The action is executed at time 0 relative to
: i) ^6 Y5 a( L  L9 K    // the beginning of the loop." @' n; H! }+ ^& x, X

1 i" e2 g7 r' r- d) L. N9 L    // This is a simple schedule, with only one action that is% H3 q; V8 n# B1 L# T
    // just repeated every time. See jmousetrap for more
. i. u: Q" x# ^6 _    // complicated schedules.
- z" r, F& E" O7 ]  $ k5 R$ f+ |1 R+ G2 b3 @
    modelSchedule = new ScheduleImpl (getZone (), 1);5 ^. y/ b3 e  t, A7 D
    modelSchedule.at$createAction (0, modelActions);1 J+ q* O6 ]& I2 Y! z2 b6 e8 \2 {
        ; s3 \# }4 D+ Z! Y% r2 x, y
    return this;
6 Z) `4 L" g: `" a, g5 g$ `  }
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