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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:
$ Q7 }, E* _5 V2 Q8 s; B3 x* Q& X. N$ K: F+ Y3 I
public Object buildActions () {) D1 ?! Z8 Q- R. Y+ ]! b1 z
    super.buildActions();9 n# |/ F2 g  o& ^8 \( ^0 ^
    ( ~, J) S" T7 U( l& K
    // Create the list of simulation actions. We put these in
2 }  f  ]/ I( j" M    // an action group, because we want these actions to be
, h1 r  E+ r- @    // executed in a specific order, but these steps should
, l, u( l% g$ c: V' Q/ Q    // take no (simulated) time. The M(foo) means "The message
4 n2 T, ^3 p/ z, Z    // called <foo>". You can send a message To a particular
" h0 d4 J1 H, r; R% O    // object, or ForEach object in a collection.( z" }  U+ f5 i" Q; T" I9 y! d8 ~
        * y  m( r; Z# T1 |3 R
    // Note we update the heatspace in two phases: first run2 f2 Z2 P0 H6 X
    // diffusion, then run "updateWorld" to actually enact the
  L$ s# W9 I- H# ]* Y( g    // changes the heatbugs have made. The ordering here is2 R# W, J- Y; M3 U) {
    // significant!
7 S- v1 j1 @4 A7 E6 q0 V        ( f# f+ R- W# l" v- z- {7 ?, ]/ l
    // Note also, that with the additional
1 O! o) V  Q. Z0 A, W; s3 |, ]    // `randomizeHeatbugUpdateOrder' Boolean flag we can% y0 G4 u% F  h, r
    // randomize the order in which the bugs actually run) `/ y5 Y) g6 u+ B1 T
    // their step rule.  This has the effect of removing any
' R0 t' T& j+ S) k/ f( O3 h    // systematic bias in the iteration throught the heatbug
- ]' q/ L& D2 G. Z; ~$ U9 m2 D    // list from timestep to timestep( K, `3 M7 k) o. c/ y
        ) \! ]" m0 n# J5 w- V* q
    // By default, all `createActionForEach' modelActions have- n8 F2 h0 K0 O- d2 C
    // a default order of `Sequential', which means that the
8 D8 l8 `1 f/ `1 X+ @& `1 m    // order of iteration through the `heatbugList' will be
7 H' h6 d2 B, @% N    // identical (assuming the list order is not changed- V: o" F- P* f/ N, c
    // indirectly by some other process).
6 K" O- z" O5 E# Z5 a. Q8 T    $ F; u# m, c9 ^1 Q) J9 C! b8 O3 O; u- d
    modelActions = new ActionGroupImpl (getZone ());
' T6 \- b! b: U1 |( @. l* D
9 G" U9 S2 |* Q3 K  U    try {6 X( r! V1 X, Y' z) X# x& _
      modelActions.createActionTo$message1 Q: q& W8 p4 D) ^
        (heat, new Selector (heat.getClass (), "stepRule", false));& Q# S3 E. ]) `& S
    } catch (Exception e) {# j6 c0 \. R6 q2 t2 c6 _9 S
      System.err.println ("Exception stepRule: " + e.getMessage ());
* G/ H. E3 v, _  ~3 x; g8 y    }
2 h6 J2 B% X$ f# X+ \4 q5 v( h9 N3 v' O  h
    try {, g$ }) X# ?. v  Y
      Heatbug proto = (Heatbug) heatbugList.get (0);
% \- T) V2 e  A$ h      Selector sel =
; R; t7 r: M( t& w        new Selector (proto.getClass (), "heatbugStep", false);
  {  o% e) P' S  o2 D7 S8 b( l  ~      actionForEach =
" @- y* I7 ~+ I: e1 i        modelActions.createFActionForEachHomogeneous$call
/ m: `1 S# Q; G; Z" M7 ?        (heatbugList,
) }, h6 E2 _5 K, m6 |. u  s         new FCallImpl (this, proto, sel,/ q/ U3 |' a4 k- @: \1 k
                        new FArgumentsImpl (this, sel)));; ?1 l, T  Z" ~: P. C+ l
    } catch (Exception e) {9 r- E" Z: g" }/ Y* q5 J
      e.printStackTrace (System.err);6 J0 z$ j) q6 C
    }" p& u0 o- Z2 @6 c8 j/ I# C
   
% u/ i. ]3 [0 j1 ]    syncUpdateOrder ();1 T- Y0 f* g2 x% l1 k; [1 F+ e
. x& S! i. O( s8 g) h0 I
    try {
# l$ C, i- u6 @      modelActions.createActionTo$message
# ]) b8 N/ L7 a" V4 E9 f3 O        (heat, new Selector (heat.getClass (), "updateLattice", false));
2 K3 ]$ D: u1 o* s    } catch (Exception e) {4 y" V( D2 y1 R! Y. C7 ]; Q
      System.err.println("Exception updateLattice: " + e.getMessage ());) Y  C9 z5 A; `  Z* i# r# |
    }
: t( _2 r6 G( A: S        
0 g( c) F' M) j1 c    // Then we create a schedule that executes the
+ N! e! G2 g+ S! j; E: ~    // modelActions. modelActions is an ActionGroup, by itself it& b  d( [( j7 p, T! y" ]
    // has no notion of time. In order to have it executed in
3 s* H! L: V/ t6 K, Y( j    // time, we create a Schedule that says to use the/ q! Z% A" _; G
    // modelActions ActionGroup at particular times.  This1 X$ h$ y; q/ d- c: ?8 X
    // schedule has a repeat interval of 1, it will loop every
) ^- C. S% |( M! l. p$ _    // time step.  The action is executed at time 0 relative to1 ]& i" F+ B$ S: }* {- z
    // the beginning of the loop.
/ O2 h- h! Z; h
( Q; P6 a  h% n' F7 x" ]. w    // This is a simple schedule, with only one action that is
7 ~% e" E9 B4 N: G$ s# p+ W( n    // just repeated every time. See jmousetrap for more+ ?% A, X$ t$ m3 `: N/ l
    // complicated schedules.0 h. B; }, q+ i) j1 }
  3 O# F1 }0 T5 w+ K' W6 T0 h" ?6 ?$ D
    modelSchedule = new ScheduleImpl (getZone (), 1);
" }8 t! P( i2 P/ O7 y% j    modelSchedule.at$createAction (0, modelActions);& v: P  ], n1 ^
        6 |* s+ k  h; h4 V
    return this;
- Z: d$ D2 C7 N* v1 m9 O0 r  }
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