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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 () {- X1 z# x9 }  X5 G
    super.buildActions();$ K- I& J. u) L: n
    ) y  e; T, a3 a) C% I( s
    // Create the list of simulation actions. We put these in
$ w; u5 H+ Y' L    // an action group, because we want these actions to be: v( b0 S/ T2 O" q. B9 E8 l
    // executed in a specific order, but these steps should
. K4 F  I' g+ M+ b6 A6 I    // take no (simulated) time. The M(foo) means "The message# D) d0 |, z5 |; L1 Q1 c
    // called <foo>". You can send a message To a particular. L4 F2 k# |" Q6 b8 w6 u
    // object, or ForEach object in a collection.( Q% H2 N! L6 T
        ) ^% z9 E2 l4 |! m# y
    // Note we update the heatspace in two phases: first run. w0 @& z( r' q- D+ _
    // diffusion, then run "updateWorld" to actually enact the
- h" a5 s' _8 w2 Y    // changes the heatbugs have made. The ordering here is& E3 v( g. b; n' P: e7 f- K
    // significant!# M- Y5 W* u# e! x, O' _) c
        
% N, u4 @% T* g7 K; [    // Note also, that with the additional
" b9 Z! k. H# H& B8 i3 a6 O1 q& p    // `randomizeHeatbugUpdateOrder' Boolean flag we can+ M5 U# Q3 A8 ^' H. u9 A
    // randomize the order in which the bugs actually run
3 O0 ]4 o3 ~9 I/ T3 |    // their step rule.  This has the effect of removing any6 K, F3 r3 c0 {! ]( b
    // systematic bias in the iteration throught the heatbug: v3 z! ~  u1 R9 d6 }
    // list from timestep to timestep
; k( l, F& u9 ^/ D5 u7 q) I0 ?        1 o7 P: U% t# \. q
    // By default, all `createActionForEach' modelActions have3 d& `# r" v4 [- x8 A5 Z2 p( P5 r
    // a default order of `Sequential', which means that the
8 C& i- a& N! ]    // order of iteration through the `heatbugList' will be1 c& v# o+ j* S9 m
    // identical (assuming the list order is not changed
# e3 Q% s- [" V- w    // indirectly by some other process).
9 v% F1 {6 L0 q' k: F& Q   
  ?7 x4 R/ e* K- P9 H    modelActions = new ActionGroupImpl (getZone ());! e  z1 R; [1 B8 F& w

, ~5 s8 C; n7 U2 S    try {
6 h2 }  \; y, ]3 @      modelActions.createActionTo$message. }+ J) x# j' T! j3 Q0 u
        (heat, new Selector (heat.getClass (), "stepRule", false));. A* W  a3 Y* K" ?9 [# @
    } catch (Exception e) {& c, h( f+ G5 q
      System.err.println ("Exception stepRule: " + e.getMessage ());
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  t: r( L5 m; M" q, Z0 [" M% {
    try {' [- {. t0 b2 v( ]
      Heatbug proto = (Heatbug) heatbugList.get (0);# ^3 b, k% M$ i8 x
      Selector sel = 6 K, s3 `+ j- h4 w, Z& z
        new Selector (proto.getClass (), "heatbugStep", false);' F4 B# Z0 @$ y" C1 g# I$ {
      actionForEach =& z4 i; L8 I0 r  w6 C  \
        modelActions.createFActionForEachHomogeneous$call
: _% |) i+ }* q; b/ E3 }! ?7 \        (heatbugList,
+ e2 K, F  t- l: f* S         new FCallImpl (this, proto, sel,+ Z9 H' L; A$ Y
                        new FArgumentsImpl (this, sel)));
! ]8 Z1 [' i# ]    } catch (Exception e) {8 a6 Y% q" ~+ z2 B  i- E
      e.printStackTrace (System.err);
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    . D( C8 |+ H, Z. G8 Q
    syncUpdateOrder ();
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$ y7 a$ A6 h7 f  R' t( [    try {: J- f2 a) S0 |; }1 i
      modelActions.createActionTo$message 5 z/ L! Y& x3 U+ v% e
        (heat, new Selector (heat.getClass (), "updateLattice", false));3 V0 b- E+ \# e
    } catch (Exception e) {$ Z3 V7 v3 J" C! M+ w$ K; a
      System.err.println("Exception updateLattice: " + e.getMessage ());
( u  x& Q' B6 I" I8 d2 h* U    }" T: Q) p+ e- d0 B; P
        ) E' `% m2 L. ]2 z* c& |
    // Then we create a schedule that executes the# j8 z: f/ Y( F$ y, N% G. w
    // modelActions. modelActions is an ActionGroup, by itself it
+ R; E+ a9 o9 _% f7 [  t- z# Z. @    // has no notion of time. In order to have it executed in# K5 B  B, {3 ]8 a+ A2 x
    // time, we create a Schedule that says to use the
  {2 ^/ f7 c4 H1 E2 [+ F    // modelActions ActionGroup at particular times.  This  T! g! J' v* M  p# I
    // schedule has a repeat interval of 1, it will loop every
& {& T5 h+ x5 K    // time step.  The action is executed at time 0 relative to0 O2 n( O  P* F+ R$ ^
    // the beginning of the loop.3 }# v8 N4 J) V' U7 o3 ]% e4 s
8 B# H& h) A1 r+ X
    // This is a simple schedule, with only one action that is
$ I7 O/ k" _; p! e    // just repeated every time. See jmousetrap for more
4 I4 |* K- b1 C1 b    // complicated schedules.
# ]7 T& S: n( {3 A( u3 d% i/ b$ @) f( z3 T  
7 e) f- I- T3 b5 c: R: C    modelSchedule = new ScheduleImpl (getZone (), 1);2 P0 F# c1 V* ]- t
    modelSchedule.at$createAction (0, modelActions);
4 {+ T1 |+ @; d* z; n! X/ [        
0 _2 E: b# T& K* d/ m- P    return this;
# s9 c8 ^! H" U9 N2 n  }
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