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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:$ x2 }( Q3 \8 k" m, L% S
7 u/ z( U/ n3 v, V. Q  Z: R4 I
public Object buildActions () {/ w, s4 l0 w8 M; }  Z, K% P. B  ?
    super.buildActions();( x: Y9 y6 S: f
   
. c1 C  y" P9 f  B3 E    // Create the list of simulation actions. We put these in
/ C# a+ l4 [7 K& x1 y' X' C    // an action group, because we want these actions to be( J/ v; G  i/ a: O# ~  S) E
    // executed in a specific order, but these steps should) i( a( m6 q( [: j/ c! A& D
    // take no (simulated) time. The M(foo) means "The message
9 t2 j( J1 r7 B' m" K1 D    // called <foo>". You can send a message To a particular
- B  U* a/ i, g5 T, W) j    // object, or ForEach object in a collection.
0 ?( c; F/ X2 t. n+ j        
4 p: H* d) x) \6 j, F. G5 K    // Note we update the heatspace in two phases: first run
' c0 d: Y6 j( E) S4 U0 b* X    // diffusion, then run "updateWorld" to actually enact the
- N: j$ Y) S1 O) `+ ~8 X' p% [    // changes the heatbugs have made. The ordering here is
; ^- A3 f, m$ A9 ^4 {; r    // significant!
+ p4 z6 ]+ }! N- V        
( I. x+ v4 I% S4 }- |8 z    // Note also, that with the additional1 ]2 F) k1 h/ x3 |4 ?
    // `randomizeHeatbugUpdateOrder' Boolean flag we can  x9 D% |6 ]4 l+ @
    // randomize the order in which the bugs actually run. _' Q0 e$ T8 f- n
    // their step rule.  This has the effect of removing any6 }$ x: R$ I( B; i
    // systematic bias in the iteration throught the heatbug
/ p" J9 E6 O9 [+ r/ J0 c    // list from timestep to timestep/ x! w# U5 G, t
        * s4 D6 ?% Y8 R, l) `
    // By default, all `createActionForEach' modelActions have+ l' U- c1 P9 T# U# i8 I7 v
    // a default order of `Sequential', which means that the( Z+ t/ i/ q! |  T+ X
    // order of iteration through the `heatbugList' will be
. ?5 P$ @  [" p( }    // identical (assuming the list order is not changed
2 y, y5 Q$ i* ^+ W5 @# [    // indirectly by some other process).' E. W, u; m  D+ O1 ?. N
    9 @& n. {: ^4 {* H7 x
    modelActions = new ActionGroupImpl (getZone ());
$ F' c' V: G  y* h# z# v
: D: G2 I; P8 `2 h9 D) k    try {
1 r0 f1 ^$ a, n7 F7 e/ X4 \8 e      modelActions.createActionTo$message
2 R0 b, z/ d5 ?) q" u        (heat, new Selector (heat.getClass (), "stepRule", false));
5 l/ x3 f& o6 E: R9 ]    } catch (Exception e) {
4 V3 C6 X4 O- m1 U! p4 S5 z      System.err.println ("Exception stepRule: " + e.getMessage ());* E- R5 F7 o3 m
    }
  n3 d8 h: E$ X# }/ P
& }7 E) |" H: S$ M3 g. I    try {  {0 p5 W  o4 Z- _& u6 d7 ?- a3 J! S
      Heatbug proto = (Heatbug) heatbugList.get (0);
7 y5 @  ^  {2 y. J9 R+ {( R      Selector sel = ) d) L) A2 b. p  m8 X  D4 I
        new Selector (proto.getClass (), "heatbugStep", false);+ [# f$ f; {1 Q6 Q- ]0 N! P8 f
      actionForEach =8 h+ ~- q& ?$ d& Q' t
        modelActions.createFActionForEachHomogeneous$call5 A* I5 ]  Z( [9 U1 {: r
        (heatbugList,
! B' v* I7 n# W9 y8 L4 y         new FCallImpl (this, proto, sel,- S7 `; z7 q* Z& \$ l3 u0 E/ f- C0 m( Q
                        new FArgumentsImpl (this, sel)));$ H# v( D; z5 F6 T; T4 n
    } catch (Exception e) {* |- i$ r0 h* g8 d1 C
      e.printStackTrace (System.err);
) V$ t4 c6 a2 S/ A. n7 k" m/ C    }
' n; j/ f/ m3 L; q2 c" i   
: J2 D5 u* w8 [! J    syncUpdateOrder ();
( r* W6 E3 e9 T) Z3 Y& c( d1 W4 D) [3 ?/ }+ {7 s5 U) h* h
    try {9 G  u6 U& w6 l% H- w
      modelActions.createActionTo$message
# s4 r2 V7 {4 ]( O3 H; n        (heat, new Selector (heat.getClass (), "updateLattice", false));
6 f: K7 ?0 q6 |7 c$ c+ p    } catch (Exception e) {2 P. y7 I1 Z& M" i# l- T+ r
      System.err.println("Exception updateLattice: " + e.getMessage ());
7 G# w3 I& S) w# ]: E) c; Y  A1 e    }4 t( b" e- i' |/ ]  b1 c
        
7 w. |7 ]. D% U+ @% w0 X+ F" D    // Then we create a schedule that executes the
. M8 V2 a, A2 N2 N0 t/ ?    // modelActions. modelActions is an ActionGroup, by itself it
  p& Q# G* v( q$ i" a. w5 F6 Y    // has no notion of time. In order to have it executed in
2 Z* ]) u2 l6 x1 Y+ y" J+ q# E    // time, we create a Schedule that says to use the7 E6 K( d" ~# \/ v% w& L2 c, e
    // modelActions ActionGroup at particular times.  This
0 S* I6 c7 }. C, E% v, e( e    // schedule has a repeat interval of 1, it will loop every& Z8 e! `0 N3 _
    // time step.  The action is executed at time 0 relative to3 W- X2 T7 i1 P. x1 l
    // the beginning of the loop.
7 Q) D7 w0 K; {2 B3 ?, N" N* m$ v
' `7 r9 t" ^. m- S    // This is a simple schedule, with only one action that is
2 ~' K& }2 A7 [0 }% Q7 X    // just repeated every time. See jmousetrap for more9 \% S; a7 D8 l5 L- w' v
    // complicated schedules.# b" T$ Q  W* ~( x* f
  
. W/ m3 C7 s/ X$ v    modelSchedule = new ScheduleImpl (getZone (), 1);. D; Q- M. j2 k
    modelSchedule.at$createAction (0, modelActions);6 ~& `* [! P5 r+ h* ?0 v8 ^+ i( f' r
        
' e: n) @6 g! H  J    return this;
/ |; ], [6 E& L* y) U+ G  }
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