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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; R# y3 l! T+ y4 v  h& K1 S
2 h" j3 D, b! b- p& @, B% \2 P1 N9 C
public Object buildActions () {6 V3 Y0 @/ h2 e4 r# T
    super.buildActions();
7 {( M7 ]" d6 Z$ ^   
  `" @2 e. f  u  D9 v) Z    // Create the list of simulation actions. We put these in
; z+ T, L1 L4 i" Y    // an action group, because we want these actions to be) e% x6 N: `: o# S* D
    // executed in a specific order, but these steps should- Z( N. ]' H% i4 Y1 W' {6 b
    // take no (simulated) time. The M(foo) means "The message$ G0 S& Q& B0 }  N9 x$ J  R
    // called <foo>". You can send a message To a particular
/ {$ b1 {: F- K$ p    // object, or ForEach object in a collection.: a- u& h$ x. I0 R' F
        
$ ~: G; o7 K: b  B! e  B6 ^3 P    // Note we update the heatspace in two phases: first run# W. h% {+ R# ^9 v# k: ~
    // diffusion, then run "updateWorld" to actually enact the) N' c  D8 T7 s% g
    // changes the heatbugs have made. The ordering here is
6 A. G  T2 S7 f5 P! O" q    // significant!# ^% B, l2 Z0 L* Q$ T) x
        - j- n4 p( E2 e5 f: S- ~
    // Note also, that with the additional! E; a- U8 D+ j; w  I# D4 m
    // `randomizeHeatbugUpdateOrder' Boolean flag we can
* K+ V8 y% g1 L4 r+ a) m0 j9 {5 y1 n    // randomize the order in which the bugs actually run4 H8 x# Y8 A7 C. o; x+ e
    // their step rule.  This has the effect of removing any
4 }6 h- i( `  o$ g$ ~9 E9 a    // systematic bias in the iteration throught the heatbug1 j! ]& q3 }% `0 O
    // list from timestep to timestep' [5 w8 Y6 e0 N0 W
        & o# d+ N" y/ o" }
    // By default, all `createActionForEach' modelActions have
* Y- e7 T# f% F; q    // a default order of `Sequential', which means that the5 u# n9 R3 p( P. z/ y1 f$ O# F
    // order of iteration through the `heatbugList' will be
$ [: X4 v5 A! p. @7 l9 b$ c    // identical (assuming the list order is not changed
# H% l/ V! Z* a7 s    // indirectly by some other process).
7 i4 k( }6 w5 n$ y6 J6 o0 T    2 {3 @7 j" D; s. v5 z
    modelActions = new ActionGroupImpl (getZone ());
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; D! o1 V  p( z5 b: O; ^. @    try {
6 {" X+ ^4 n( d# V      modelActions.createActionTo$message
7 v) W7 [/ c3 _7 J        (heat, new Selector (heat.getClass (), "stepRule", false));
8 H1 M7 _" O: x/ O    } catch (Exception e) {
9 ]% l9 N/ @6 ?. I& F4 g      System.err.println ("Exception stepRule: " + e.getMessage ());! @# @$ R4 s$ A) e
    }
3 P1 Q, F* v- j& K" F$ q
: s4 q( y$ d5 |/ W  T7 Q2 L0 o" `2 _9 L    try {
" Z! H& F. b' w5 W# Y$ P      Heatbug proto = (Heatbug) heatbugList.get (0);$ m# |  c! n) i
      Selector sel =
( e; D8 d! K3 ~; w        new Selector (proto.getClass (), "heatbugStep", false);. D# P$ b! }3 u+ m, _2 R, o/ Y
      actionForEach =1 c' J% H  `# R3 Z8 p
        modelActions.createFActionForEachHomogeneous$call
% \" Z+ d) }/ F1 |        (heatbugList,+ K# G7 r, ]* e. ~
         new FCallImpl (this, proto, sel,
  F* _6 L$ Z: l  Z0 G                        new FArgumentsImpl (this, sel)));# p# W. d0 l* W4 ~& M
    } catch (Exception e) {$ D9 ]/ U1 {1 j0 ^8 W' D) m
      e.printStackTrace (System.err);
& v1 \$ P5 f! V, T$ {% W( x" a5 E  C    }
' R7 m3 d8 t3 \& E2 ]# q- z   
( c% p" \& r  y$ Z7 P    syncUpdateOrder ();
) U4 I% @" Q' }  \$ L& [( F! \
) p- t3 E* h+ E3 W5 u    try {  [4 U7 W7 {" T7 Z" ^6 n! h
      modelActions.createActionTo$message 7 w9 e9 v: S5 t3 u, x  ]
        (heat, new Selector (heat.getClass (), "updateLattice", false));
& _, `/ t: s! j) j# r9 C$ D9 Y    } catch (Exception e) {
3 l+ G# Z/ ]* A* ~0 E: Q% Y) g      System.err.println("Exception updateLattice: " + e.getMessage ());
. \! f5 @; B0 s3 _    }
/ ~: r( e# a. b, @        
7 m1 q% ~9 S: H/ u  a# a7 y    // Then we create a schedule that executes the
- ]" m4 ~7 T6 J    // modelActions. modelActions is an ActionGroup, by itself it
6 L, u( H+ Q: R, ?9 Y    // has no notion of time. In order to have it executed in) W# I( L* g& \" Y9 v$ D# O9 M9 J! H; L
    // time, we create a Schedule that says to use the
$ b* I& g$ a( R* {+ k( |    // modelActions ActionGroup at particular times.  This2 [+ L5 h$ t2 G
    // schedule has a repeat interval of 1, it will loop every
" f& K& \- M8 k! q9 u    // time step.  The action is executed at time 0 relative to" J! S, Q1 o: _2 u8 d9 i+ k+ J$ B
    // the beginning of the loop.
# n3 ?) d8 l; d" Y2 K1 R8 V
9 Z+ H/ `9 G5 F* S/ P. B    // This is a simple schedule, with only one action that is
: ~# U0 `, G1 Z) _" e  v. C    // just repeated every time. See jmousetrap for more9 Y6 O  ^6 G0 x* D  y9 I
    // complicated schedules.; P2 x9 d7 g6 x, B' \' a
  
3 ]3 o' ^5 p1 y! H. K8 ~2 a    modelSchedule = new ScheduleImpl (getZone (), 1);  A/ ~- K: ~8 Y4 }* @5 s5 Q
    modelSchedule.at$createAction (0, modelActions);
  m; K9 {2 {. b; g" _        
. z% P8 p% b) {: T    return this;
( Z- T/ v1 B, m  }
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