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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:$ N; }8 d& K8 T' e& E

. O( ^, y" L1 o) |! q' G) V' h public Object buildActions () {
, ~0 G0 n8 B$ x: o" _    super.buildActions();
& A: R9 h+ t! K0 E; L) I    + R1 N/ f5 U6 `: V3 H1 j% O
    // Create the list of simulation actions. We put these in- G; ]$ N& H& @2 P" ~
    // an action group, because we want these actions to be& F" i1 F) ^9 l4 h) `$ c9 E
    // executed in a specific order, but these steps should4 \0 k0 f8 j- @7 j0 k
    // take no (simulated) time. The M(foo) means "The message
/ h: d6 g! d' Y  J" N, V5 I3 C8 m4 |    // called <foo>". You can send a message To a particular: \8 O( D) P$ x% e0 O- J
    // object, or ForEach object in a collection.% g5 \# V- B# z9 v
        
, Z8 I5 ^, a4 K- {$ F* o    // Note we update the heatspace in two phases: first run6 D# U0 I9 m/ G% R. W. }" G+ F8 X: m
    // diffusion, then run "updateWorld" to actually enact the
$ T; j7 N- v/ U" [' e' l0 h    // changes the heatbugs have made. The ordering here is3 q3 T# y1 U9 `( C2 g
    // significant!8 a3 `4 a- X7 e- l6 G$ b
          {: s# A' x# q5 m
    // Note also, that with the additional
+ c2 K1 L& `1 h8 y  u    // `randomizeHeatbugUpdateOrder' Boolean flag we can" i' n! g* U1 D+ u9 `, Z
    // randomize the order in which the bugs actually run& \3 b) q! N! `/ z
    // their step rule.  This has the effect of removing any
( U, _1 H  _- D( |" @4 g& _    // systematic bias in the iteration throught the heatbug* F$ U1 O' ?: T, ?$ Q' m, r7 L$ F4 J
    // list from timestep to timestep3 d# C, w8 K6 m! K( c# L0 U
        * _: T6 f7 E# t* i! r; w
    // By default, all `createActionForEach' modelActions have
* o7 L" N$ y: ]' [1 A$ @    // a default order of `Sequential', which means that the$ g. Z8 z2 L. i  l- A
    // order of iteration through the `heatbugList' will be
7 X  N' E; P' Q( {( v    // identical (assuming the list order is not changed% X4 ]& }' [: w3 j+ y) u3 n
    // indirectly by some other process).4 s3 S$ ]6 g  L; R
    9 c  ^+ U0 U. p6 Y( R3 W5 C
    modelActions = new ActionGroupImpl (getZone ());8 C& M4 ^! o' ]; i+ L) s
5 o4 `9 h8 ~1 E8 j
    try {
' z% {# R: v( O8 K9 z* _5 c' S      modelActions.createActionTo$message2 N2 M' U' n8 b# S
        (heat, new Selector (heat.getClass (), "stepRule", false));
% e  l, B! N& O$ @7 j    } catch (Exception e) {# I% _, V8 a" w+ D( S- z
      System.err.println ("Exception stepRule: " + e.getMessage ());
# I3 c6 w) A# h+ r7 |) p  u    }
$ p! J  j# {% |
( F1 T1 }& S% o( D; M, J    try {
2 n  u5 s: n! X' W' o" Z2 }' e' S8 s      Heatbug proto = (Heatbug) heatbugList.get (0);
# S) O! p( }; \      Selector sel =   b7 {- E  s8 j" l
        new Selector (proto.getClass (), "heatbugStep", false);% d8 L  V, A( h% V* `8 h3 F: h
      actionForEach =
  i% t( |$ G/ c* {0 e        modelActions.createFActionForEachHomogeneous$call
" C, \/ I9 N) m: q        (heatbugList,
- P& N! e* o, F# C3 p         new FCallImpl (this, proto, sel,
& g) W( y7 C, p3 V                        new FArgumentsImpl (this, sel)));
8 Y4 Y2 x7 P: k! @* R8 W) p1 m    } catch (Exception e) {
) m5 f! d7 J% w% i      e.printStackTrace (System.err);& i( l  [8 e! a4 A' T
    }
3 c' i; k: ~2 ^3 T; a% i9 Z3 `    + B( {7 ?0 [2 `/ o6 G
    syncUpdateOrder ();
' h, F8 s( {& a' Z. O0 u6 T) o$ k% h- J9 u# W3 Y; `
    try {3 c; D) b( V  o# u
      modelActions.createActionTo$message
! N# f7 y! o4 O! J6 h$ t& H        (heat, new Selector (heat.getClass (), "updateLattice", false));0 T4 }2 {+ O* a
    } catch (Exception e) {
* M) a( j9 z+ m" K# G' ~& i/ V      System.err.println("Exception updateLattice: " + e.getMessage ());
# K, S. {8 _% S9 n# d    }2 _( c0 D1 A/ o
        
) D- x& o1 y- _! ^+ X9 b5 [    // Then we create a schedule that executes the3 R* [* n4 Q8 l
    // modelActions. modelActions is an ActionGroup, by itself it
7 ?/ a) j( Y0 ]( i# A- |7 s    // has no notion of time. In order to have it executed in' t' I, k( _, t6 R( x3 X7 H5 S% u0 w
    // time, we create a Schedule that says to use the
! f1 L9 w7 u8 |" T8 E    // modelActions ActionGroup at particular times.  This
& `; U  C0 w/ [3 c. |    // schedule has a repeat interval of 1, it will loop every  L, o$ b8 Y5 n" g6 M
    // time step.  The action is executed at time 0 relative to
- T# E( ], ?4 `$ L$ `! \8 ^    // the beginning of the loop.' _' K- J$ e. c
! T5 Q: }- N, O2 H
    // This is a simple schedule, with only one action that is
1 k2 ^; `3 Y/ ?# P    // just repeated every time. See jmousetrap for more
$ r) Z3 {; {# x8 S    // complicated schedules.
5 v% v) p5 O. q$ n5 X. P- Z, S- \  Z  7 Z$ U  U2 D6 b$ B1 u
    modelSchedule = new ScheduleImpl (getZone (), 1);2 i* v3 N' c- t2 \4 Q& ~
    modelSchedule.at$createAction (0, modelActions);
8 S4 M! |4 R# x+ z3 ~% }        
- C6 W2 q3 k, h2 n* ]    return this;
, p- f" |# W$ L7 i: ~# O  }
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