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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:
% y. U0 M! |6 N" `' T
1 e7 W! _% V& g" s# R& O public Object buildActions () {
; K  b1 N4 [# c  N    super.buildActions();
( ^8 X. w* t9 r   
; L) ?5 B  e9 O    // Create the list of simulation actions. We put these in
  z! V- |  @6 A& t    // an action group, because we want these actions to be
  ?7 V% w0 J3 |% }    // executed in a specific order, but these steps should2 z# g/ i2 L2 h, D
    // take no (simulated) time. The M(foo) means "The message* K2 a; S/ y7 n0 [: f' b
    // called <foo>". You can send a message To a particular- K# R% |- [# L7 _8 K2 X) ~
    // object, or ForEach object in a collection.
. i; b9 ?1 i. o" v5 W        8 H! _7 p0 K, \
    // Note we update the heatspace in two phases: first run& r; r! S+ f2 {
    // diffusion, then run "updateWorld" to actually enact the4 b4 h4 q# H! K+ {' ?6 L- Z
    // changes the heatbugs have made. The ordering here is
3 c" d0 F* ~  `* S    // significant!
1 K8 |; Y+ `& S3 A: S& e        
3 `) |) L( h) g( M2 i    // Note also, that with the additional" A# v# W# A) T* Y9 J
    // `randomizeHeatbugUpdateOrder' Boolean flag we can& G4 i& C( o, {* i" |4 ?# k& w
    // randomize the order in which the bugs actually run
! c) d1 X8 T5 `7 f& i4 Y% `    // their step rule.  This has the effect of removing any
$ J  \! q: _2 A& H% N5 d    // systematic bias in the iteration throught the heatbug: `1 D" A' J5 i& \' ~: K
    // list from timestep to timestep
  s. |6 y0 K0 r3 h0 ?        8 ?. F9 r4 G1 @9 h* B
    // By default, all `createActionForEach' modelActions have6 {: z3 `1 @  d1 |- |. y8 i
    // a default order of `Sequential', which means that the6 e+ B3 J1 j( {6 \5 F: ^" i, L
    // order of iteration through the `heatbugList' will be
8 r. k* z' Q7 b0 k5 o. E    // identical (assuming the list order is not changed6 ]) H  [1 D( T6 c' f. w
    // indirectly by some other process).: c! B2 I, ]1 G
   
1 \8 Y8 `1 O5 Q: I+ T7 x! a- A" K    modelActions = new ActionGroupImpl (getZone ());9 H' u" m& L/ i9 M- ]  }

9 E) R3 k# D$ p    try {! @" H4 ~' c. g* E: p% p! z6 c; T
      modelActions.createActionTo$message
3 w* V5 A- \: W* F& E" ^$ w7 ^5 K: d        (heat, new Selector (heat.getClass (), "stepRule", false));
1 R* Z4 d( |% @$ y4 W( E    } catch (Exception e) {. L  w$ p  A; L7 F4 M/ j/ i! m$ o6 W  l8 ?
      System.err.println ("Exception stepRule: " + e.getMessage ());7 q$ i  o  c0 ^& x( c/ G/ y) h5 o
    }
/ a9 [/ {' o  _6 |" U* Z3 I' R# R. r1 {3 G% q( O6 t5 U: w
    try {( I6 p" j' Z" H/ D" M/ D9 O$ \
      Heatbug proto = (Heatbug) heatbugList.get (0);2 d6 W" @" ?* m  c8 s2 }9 Z# V
      Selector sel =
1 X) @; B" k) A0 |        new Selector (proto.getClass (), "heatbugStep", false);& b* f) r* r  M5 c
      actionForEach =
; X' d7 f8 g1 U- g$ a+ D        modelActions.createFActionForEachHomogeneous$call6 C$ `1 Z6 Z- r6 |* [7 I
        (heatbugList,
$ N4 X. l5 y0 K' w! Z1 Z         new FCallImpl (this, proto, sel,- G. [, ]3 p8 {! f& C
                        new FArgumentsImpl (this, sel)));% _/ {1 F8 s$ x% w5 ~& F/ e' D
    } catch (Exception e) {9 t( T% ^! v/ D* n# ^
      e.printStackTrace (System.err);% ^, |! L5 {* w( C8 t+ B& y* }
    }
' [5 z% R( u1 H) Z$ i$ k/ R    % V' d& L" K! [) {4 t7 M7 x
    syncUpdateOrder ();1 m) M  _+ \% Z: A1 X

8 o. |! n& W+ s; W    try {5 n, U: P8 u" X) X1 P: a: ]4 k) ]; l
      modelActions.createActionTo$message
/ K  Z+ W3 a2 n' j, z        (heat, new Selector (heat.getClass (), "updateLattice", false));$ M, W; F$ o- j: N+ q
    } catch (Exception e) {
/ l1 y9 F3 I9 a: a$ S. P% ^      System.err.println("Exception updateLattice: " + e.getMessage ());
: A9 [9 {7 f- J' G$ k    }
0 u0 x* v3 q' `" f, n  b        
: n+ I/ B/ ^  T- K( [5 A    // Then we create a schedule that executes the- m% O) X& ~- |, L6 y
    // modelActions. modelActions is an ActionGroup, by itself it+ @' O* x5 s; f( m1 v* `
    // has no notion of time. In order to have it executed in* g7 d$ @+ ?( H" I5 g
    // time, we create a Schedule that says to use the
3 G) y) ~6 u; B1 E# s) \    // modelActions ActionGroup at particular times.  This& {# v# }; p0 y
    // schedule has a repeat interval of 1, it will loop every, R6 {9 K3 c& p) D9 v( T% f3 }
    // time step.  The action is executed at time 0 relative to
. \4 V2 `, h" `7 C3 ~    // the beginning of the loop.
* X/ L4 O$ Z" U' }4 y$ w* l# d& D% ^" n6 e9 q
    // This is a simple schedule, with only one action that is: N( M. |, _' L4 S7 x, \0 r8 N
    // just repeated every time. See jmousetrap for more
, l$ _# o; C8 t+ q: M% d3 Z; d    // complicated schedules.) w  E2 E! G; m. y5 W0 w3 m
  ; k1 U' o, O; }: K2 ~$ O- E2 w
    modelSchedule = new ScheduleImpl (getZone (), 1);
6 I) ~; ~. ]( H  p    modelSchedule.at$createAction (0, modelActions);
3 v; Y: d4 P* C/ l3 r          `2 j3 C) Y; M' X9 i' I" ]
    return this;7 D% z0 k% U- D0 _
  }
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