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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:
) q# `* x& b) J7 ^# w( c9 B$ I
4 G, b* U* ]5 {9 J/ \: ~# ~- R- U public Object buildActions () {' |/ ^/ y  a) W. m7 a* I6 E1 u
    super.buildActions();
% Q* q$ v7 ^& V9 Z1 F    6 t$ |; I  P5 L1 s/ P
    // Create the list of simulation actions. We put these in3 S. M+ W$ b- U$ I8 e# n
    // an action group, because we want these actions to be9 F! x1 X# a7 q1 ^
    // executed in a specific order, but these steps should
* \3 X* m# S% A- J! I    // take no (simulated) time. The M(foo) means "The message3 c& c9 Y) j8 w+ G5 M1 @& `
    // called <foo>". You can send a message To a particular
& R) L: U% b- z% v9 U1 K& v& E    // object, or ForEach object in a collection.
% _  f! j: q' z: G* b) A        / U9 Y! B5 G6 L* @
    // Note we update the heatspace in two phases: first run
7 w: _5 \* q! k5 ]$ d* F1 x  {    // diffusion, then run "updateWorld" to actually enact the
& W3 g6 b6 n) S3 `+ |- t* Z, z; |    // changes the heatbugs have made. The ordering here is
# B' X( k  a! d! ^% b2 d9 [. _4 O    // significant!
( R7 }6 j( w4 D7 j, ~# _        7 s- R0 v% b  S- l( J
    // Note also, that with the additional% T$ i( t5 s; \2 ?  C% \7 A: Q
    // `randomizeHeatbugUpdateOrder' Boolean flag we can% ]( B  r) |) p/ S& {: @4 ^7 v* s
    // randomize the order in which the bugs actually run& ?7 B* C* c2 [
    // their step rule.  This has the effect of removing any
! C' _% B8 I* E9 ], J  O    // systematic bias in the iteration throught the heatbug
! q6 H7 K1 H+ O7 w    // list from timestep to timestep
! ?* Q) @* q0 k1 P# z: {        1 N2 c4 D: `; Y
    // By default, all `createActionForEach' modelActions have+ s7 b2 _! O) K$ G% ]! b3 y: C* }
    // a default order of `Sequential', which means that the7 K+ J5 N* ^# v, Q' a3 c
    // order of iteration through the `heatbugList' will be( d' I( e  I3 a$ R; p6 G
    // identical (assuming the list order is not changed
  C9 O2 t+ T* @# W- a1 z( [    // indirectly by some other process).% ~: K) T. \$ D
      S) B( a& z3 Q
    modelActions = new ActionGroupImpl (getZone ());
7 A# q; |# }5 K6 _* u# z4 \! |# J& ]% `
    try {- D$ }6 [5 S1 x
      modelActions.createActionTo$message
1 G0 H+ c* ?* f9 l6 [% L) u        (heat, new Selector (heat.getClass (), "stepRule", false));
5 }4 Q- Q% @$ K9 x2 ~    } catch (Exception e) {1 x. P% [& J( d& ^: X/ @  }
      System.err.println ("Exception stepRule: " + e.getMessage ());+ I3 [; v4 g8 h
    }
5 K( W6 V# s7 b$ @2 {, L6 T7 I" o
$ B5 @( j2 r2 g! S8 e" |    try {! ]7 x) S0 c$ y0 I+ V. F+ i; |
      Heatbug proto = (Heatbug) heatbugList.get (0);
( k; z. s1 P5 S% E( Y      Selector sel =
* E7 `6 Y+ [9 N5 D8 `: B        new Selector (proto.getClass (), "heatbugStep", false);
* g0 A9 G( S* U% a  J% v; b      actionForEach =
3 C" K5 ?) H* y" d        modelActions.createFActionForEachHomogeneous$call5 Y+ z' g1 j3 A' E- `
        (heatbugList,) n8 U2 r. k9 p" y* R
         new FCallImpl (this, proto, sel," R2 w/ S6 Q( k* `; ^% _% F; R2 h. ~
                        new FArgumentsImpl (this, sel)));; D! F: x! v/ \  s
    } catch (Exception e) {' y  l) Z9 e: X. J
      e.printStackTrace (System.err);5 i$ t" T* c1 P! A( e8 _) I
    }* A' M) X* v" l
   
' `: e" N1 @0 c4 t    syncUpdateOrder ();
7 {3 E1 l$ t. Y5 w9 d0 @; G0 l; B, z( t% C( g
    try {9 z6 A. ]" `# N9 C+ B
      modelActions.createActionTo$message
. G- d/ a9 I  n% G4 {2 {        (heat, new Selector (heat.getClass (), "updateLattice", false));1 `6 O+ c% k1 o% ]+ _% M: A
    } catch (Exception e) {
. z' @" q+ a+ j  K" I2 c  d; t      System.err.println("Exception updateLattice: " + e.getMessage ());
  D; m& N! e5 z2 t    }
6 ^( }2 m- a2 }! I5 C        & v" P7 \+ c" n; q2 w! E
    // Then we create a schedule that executes the0 u! N! T2 v1 }1 U" w- l
    // modelActions. modelActions is an ActionGroup, by itself it9 R  }' p8 Y6 j
    // has no notion of time. In order to have it executed in
; n2 t2 J( H/ F" b2 X    // time, we create a Schedule that says to use the, W$ q- T  W' N2 k
    // modelActions ActionGroup at particular times.  This
, X: Q) s, B# t$ f. G8 w. }    // schedule has a repeat interval of 1, it will loop every+ [. E# b8 f2 H4 A. O8 p- m  M5 m. Q
    // time step.  The action is executed at time 0 relative to
/ p8 F7 A5 l" I9 F1 [8 i    // the beginning of the loop.
' Z; F& q6 U2 |
! }; s5 S+ N* L, E    // This is a simple schedule, with only one action that is
& c! Q3 U4 \, ^6 z/ J1 W    // just repeated every time. See jmousetrap for more1 P# F& }7 W% I% a7 n
    // complicated schedules.
1 B* e2 J& B5 g8 V: e& f3 W4 ]  ! f5 P! r. v( k3 k
    modelSchedule = new ScheduleImpl (getZone (), 1);+ T$ v! d/ Q# g+ x8 \5 P- G( y& K( n
    modelSchedule.at$createAction (0, modelActions);7 P# R4 Y* F) T5 y0 u- _$ I
        # [4 w' T: z- Z6 X/ V
    return this;' [" G: _9 x1 j3 `. x
  }
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