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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:
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public Object buildActions () {) z3 Z' B' g8 d1 t9 d  _
    super.buildActions();5 v2 U# _6 k6 B0 `6 z  q
    5 |- ~6 j9 D1 b9 }# j
    // Create the list of simulation actions. We put these in
# f2 D# M% v" v/ }6 o    // an action group, because we want these actions to be
: J- q- `- v' X. e. n- e- C6 d    // executed in a specific order, but these steps should, P# q1 {! g, \, M6 y" w
    // take no (simulated) time. The M(foo) means "The message* v. s+ R  k9 N! n% A
    // called <foo>". You can send a message To a particular+ C* O1 C  I# M8 F) G
    // object, or ForEach object in a collection.' b6 m$ r! G- g: v
        * [: C5 ]* B* G. ?% Z* v' z
    // Note we update the heatspace in two phases: first run/ y- ]& k) p. Q' V
    // diffusion, then run "updateWorld" to actually enact the1 L3 @- y0 D3 E
    // changes the heatbugs have made. The ordering here is
/ k& w0 D; ]5 w* b' G& K    // significant!& R- B( M: y0 t
        
0 g2 K1 `. N" f/ u    // Note also, that with the additional
+ Q+ z* P# Q& x& i6 }- n    // `randomizeHeatbugUpdateOrder' Boolean flag we can" t- t2 m3 w  Z& }! q5 S. p2 N
    // randomize the order in which the bugs actually run
+ m9 x6 W4 V( i# I2 G    // their step rule.  This has the effect of removing any
% H4 _0 {/ U! @6 k3 `6 n    // systematic bias in the iteration throught the heatbug; [) G4 ?! }* d: {
    // list from timestep to timestep
( z/ S! C: U/ V* ~        
: o% T+ [) @4 D    // By default, all `createActionForEach' modelActions have
8 p/ Y3 p2 t! _7 i7 E5 H6 Z0 j* W    // a default order of `Sequential', which means that the
$ s6 O& l5 V9 C0 f( w    // order of iteration through the `heatbugList' will be) a: z% l' W, i4 e7 O
    // identical (assuming the list order is not changed
  ~5 f! D6 T( D: @7 l! K3 u( }# v, O    // indirectly by some other process).
& N2 S+ c  E' h& d    # y0 \, V- L0 n: J, i; u7 u  x
    modelActions = new ActionGroupImpl (getZone ());$ B! r1 ]- x  L# P  ^8 o
$ B! b: n) X2 u! C, E2 q
    try {
; [$ M: S5 H: A% g# H. s0 [$ |' |7 [      modelActions.createActionTo$message
) q& i3 K' o: ^( E        (heat, new Selector (heat.getClass (), "stepRule", false));
% f7 Z5 F" V- ~+ b) h9 e) q    } catch (Exception e) {
' r, S, S5 G3 I5 W, n$ ]      System.err.println ("Exception stepRule: " + e.getMessage ());) e- P2 c# k. z  |0 G8 F  m
    }' j+ N) o; |! u! ~* n' y" K
- L! H! _3 S4 z0 }: n: p
    try {
! O+ V2 [  ]: @9 Q      Heatbug proto = (Heatbug) heatbugList.get (0);
; ?% k% K; ^* Z7 H      Selector sel =
8 T  \$ z* g- B  a" y        new Selector (proto.getClass (), "heatbugStep", false);
' ~4 U) M0 E2 m0 k" `) ~  _$ y      actionForEach =
! M3 i0 v0 z- B6 S  G  u" I% j        modelActions.createFActionForEachHomogeneous$call
" |# j6 W- s# m1 j% z" u        (heatbugList,
, N6 j" a, i: J         new FCallImpl (this, proto, sel,
9 u7 }3 ?0 K; M5 m+ S2 g, ~                        new FArgumentsImpl (this, sel)));$ S! u, i0 m1 `% f- u
    } catch (Exception e) {
. |/ O/ l: |& o  x6 S0 e      e.printStackTrace (System.err);+ b5 H  W0 X4 z0 n, V
    }$ E; s0 m# ?+ j& N2 {, y
    + }. H9 ^6 {  w  Z( t7 z4 H
    syncUpdateOrder ();
  e3 ?  j0 q. y7 R, @. E  v; L
0 |, d* K+ O+ r; l% B    try {( b% t$ {7 d! B2 D6 x* b! @6 h( d
      modelActions.createActionTo$message
+ N2 _- _% h2 |1 J5 D2 W        (heat, new Selector (heat.getClass (), "updateLattice", false));
  q' V$ M6 |3 z9 c6 T    } catch (Exception e) {7 w7 l% \2 Q: F- z6 o7 b/ r! I- B
      System.err.println("Exception updateLattice: " + e.getMessage ());
! N; p+ M3 [; Y) x5 e5 i/ Y+ r: t    }; E4 ?  C* Q; U4 P5 K% L
        & V/ P4 `& |! m3 d6 }, d# Q& y
    // Then we create a schedule that executes the; h# e% T! S) p' v3 x1 W
    // modelActions. modelActions is an ActionGroup, by itself it
/ j* \* P" T1 I$ D0 l    // has no notion of time. In order to have it executed in3 ~4 g: M- i/ F. @% Q- i0 v
    // time, we create a Schedule that says to use the* t" |" V4 j! ?6 K, C6 {3 s. x( K
    // modelActions ActionGroup at particular times.  This4 A% o5 n' k9 y: ]# Z
    // schedule has a repeat interval of 1, it will loop every4 F6 p- f7 F- Y4 k6 P; G
    // time step.  The action is executed at time 0 relative to0 W  ]6 ~+ m; z. k2 v4 ]
    // the beginning of the loop.
& |" x5 T7 e2 m5 E* A% g& k* O9 A$ t1 ^% U5 G
    // This is a simple schedule, with only one action that is8 h3 N) `9 o5 `, t2 Z7 }
    // just repeated every time. See jmousetrap for more: H! g6 K( S7 w: N! C
    // complicated schedules.
1 f/ x2 ^$ N$ z. B  
% I; V: y5 R( I( Z    modelSchedule = new ScheduleImpl (getZone (), 1);1 s; j" H5 ]# Q
    modelSchedule.at$createAction (0, modelActions);& d4 S, @+ D: H
        
2 E& R* z  R: q3 n( C" V    return this;
% ?. n& V1 Z- b7 J( ]% `, X+ r" g  }
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