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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 () {( ]! i4 y/ q, a8 z/ q
    super.buildActions();
. _4 D: Y% n" V: `" g# }6 U    ; ^' d0 V' U& _
    // Create the list of simulation actions. We put these in: [3 z: {# Q) i
    // an action group, because we want these actions to be
( X. U: b  w/ n9 b3 S; z7 w    // executed in a specific order, but these steps should7 ]! S) o2 C4 R( P
    // take no (simulated) time. The M(foo) means "The message* |) K9 o1 p' R5 M2 Y+ C
    // called <foo>". You can send a message To a particular) F0 ]& w. ~3 q4 p% j
    // object, or ForEach object in a collection.
" ~8 Y; F. h& D- _        ) J- @3 G7 C8 U
    // Note we update the heatspace in two phases: first run0 C6 r! ~9 c& p/ \6 U
    // diffusion, then run "updateWorld" to actually enact the
3 `7 H9 s% s) O) p" V7 V    // changes the heatbugs have made. The ordering here is
8 }2 M1 u: X/ U& a% x% X    // significant!
/ \* S  D5 w4 \% B$ _! X        8 }- \/ O) }- b9 [9 {
    // Note also, that with the additional
+ `( V  @9 v% Q' V! \    // `randomizeHeatbugUpdateOrder' Boolean flag we can" P# U" g3 O0 s! [* B( a! n
    // randomize the order in which the bugs actually run$ ^% g/ k. C% Y0 i
    // their step rule.  This has the effect of removing any6 K; K. s3 {( z4 L% q( j" V' t/ }
    // systematic bias in the iteration throught the heatbug
% l* j% ?; e( M8 X  l    // list from timestep to timestep4 c. D3 Q( D; B1 l% r
        ( R2 D  d' h0 r
    // By default, all `createActionForEach' modelActions have9 a9 {1 Y. w* [. h! v
    // a default order of `Sequential', which means that the
. v) Q- `; c& g7 Y    // order of iteration through the `heatbugList' will be% d( |3 s! W- Z# a# J( N0 P5 F
    // identical (assuming the list order is not changed
3 l. o! P& r9 ]# S3 ~    // indirectly by some other process).
$ v8 E  T$ r* ]' ?. b/ U; L+ O   
( ~9 t$ ^. l# S5 q% c! H# `    modelActions = new ActionGroupImpl (getZone ());! @: R) r- Y$ h# M' Y% p. u1 j- }

, m1 x; x' o4 C5 F: y. f    try {
, h  k6 e6 ^8 f1 q! a; F, C      modelActions.createActionTo$message
  w5 V3 @& c% Y+ k        (heat, new Selector (heat.getClass (), "stepRule", false));
6 E2 X8 U& Y! r0 _" F3 m+ w    } catch (Exception e) {, O, c) E1 F/ j
      System.err.println ("Exception stepRule: " + e.getMessage ());
# \) ^5 w6 H' ?& u6 m2 y- r    }
$ a3 Q8 r* h8 h$ I3 _# d' M$ v' D. ]/ i) }
    try {# i8 U/ s, Z8 C" e6 y7 E
      Heatbug proto = (Heatbug) heatbugList.get (0);6 O2 U1 V7 b4 I# b+ t
      Selector sel = 0 A% B* P! j$ H: \1 Z
        new Selector (proto.getClass (), "heatbugStep", false);
# k! B8 O6 A0 B% [; V6 Q      actionForEach =
: G( H8 `" n: i0 q, n        modelActions.createFActionForEachHomogeneous$call: F; B# f7 i* Y8 Q  ?, P
        (heatbugList,. J. p" m# }  p8 N
         new FCallImpl (this, proto, sel,. g, m3 s: H5 R; |% [$ S9 S
                        new FArgumentsImpl (this, sel)));
& `& M0 B" X5 V, F    } catch (Exception e) {, y$ S/ F: G& y3 V
      e.printStackTrace (System.err);
& E8 s  d$ u# Q    }
" K! \/ [+ e) Z- O+ l$ f   
. O7 f* h7 N7 v4 ^) z: g- g5 Z# [    syncUpdateOrder ();
+ E. u' ^! k& \- `. X- |1 E9 z' C! v8 Z
    try {
. \+ w2 z, M* U0 A" i      modelActions.createActionTo$message ! k! C  i* `4 W9 l! i
        (heat, new Selector (heat.getClass (), "updateLattice", false));1 o0 t" ]- O( z& k$ p; V2 [8 D% E
    } catch (Exception e) {
% s8 Q; Z! O7 D4 s, G0 r) C3 z      System.err.println("Exception updateLattice: " + e.getMessage ());! F- u  T' F& h% T0 r' M0 O
    }; |5 J6 }1 ^% ]. }
        
: H( {$ q/ \, s( o9 m    // Then we create a schedule that executes the
7 B0 q4 u. x& X; I7 T4 j    // modelActions. modelActions is an ActionGroup, by itself it
1 M7 z, k& Q9 ?- ^, K5 J9 z    // has no notion of time. In order to have it executed in
1 I5 U- I+ M) R  b5 q  b    // time, we create a Schedule that says to use the
5 H# R0 S6 {' b5 o% ^: D    // modelActions ActionGroup at particular times.  This2 e( `& C& [0 Z- H! L6 T3 J
    // schedule has a repeat interval of 1, it will loop every
9 c' g5 U" I  g    // time step.  The action is executed at time 0 relative to
" ^6 S4 M) D9 T    // the beginning of the loop.. ]& w1 K* X& n
4 {) z- ~: q" t7 {
    // This is a simple schedule, with only one action that is
$ N$ u6 R5 w$ I    // just repeated every time. See jmousetrap for more
/ D2 c3 o2 T" P* D    // complicated schedules.( e& C3 q( @" ^# S. a  k
  
* P6 B  f' O  E4 T# P  ~    modelSchedule = new ScheduleImpl (getZone (), 1);* E; F3 S% C) S
    modelSchedule.at$createAction (0, modelActions);. q% F/ @" g" Y3 v! g" c
        
( P* a7 s. ~# f2 N/ |# f    return this;+ Z% f" I7 ^. v8 I0 n
  }
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