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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:0 D- e& B6 w; M7 v2 z, d5 \

9 X% F: z+ C  b public Object buildActions () {( C4 f7 N2 r- P# e
    super.buildActions();
9 A6 z) h# K( s0 ?0 h   
) C' f& @# q5 h% ^    // Create the list of simulation actions. We put these in
* y6 x7 d& C$ {, Z# N9 P' n2 s    // an action group, because we want these actions to be, z( w+ c) s4 h% n
    // executed in a specific order, but these steps should0 z/ Z& u$ C8 k
    // take no (simulated) time. The M(foo) means "The message
& Q: \/ n" _; [& p0 Q+ `/ h. U3 S    // called <foo>". You can send a message To a particular+ b1 ~! n" h1 h; W$ J2 i8 y0 X# U
    // object, or ForEach object in a collection.6 e  ?$ _* |4 ?+ F7 a
        ! v& h9 @6 ~; j5 W: |$ B
    // Note we update the heatspace in two phases: first run
# C& P9 e# ^! c( Z. M+ m4 z    // diffusion, then run "updateWorld" to actually enact the
5 ]+ ]2 L0 Q1 H+ q: f& E8 }# n    // changes the heatbugs have made. The ordering here is# X% m5 v; D3 R9 z  J
    // significant!; A  y8 L- a1 L1 x# ^( Z2 ]
        ! m6 Q' j8 U8 D/ k
    // Note also, that with the additional  F2 q% g5 F$ b0 g
    // `randomizeHeatbugUpdateOrder' Boolean flag we can/ w" Z$ _9 M/ L8 y8 r* F
    // randomize the order in which the bugs actually run; p: Y7 F0 w+ u
    // their step rule.  This has the effect of removing any0 M  ]: w4 \& z! @' x
    // systematic bias in the iteration throught the heatbug* V* j! Z- k& }! w7 x
    // list from timestep to timestep  T& i4 \9 \, N
        
3 x- W4 C6 N5 S1 }: ?' i    // By default, all `createActionForEach' modelActions have
: v9 r% O5 _% L    // a default order of `Sequential', which means that the
3 h2 j$ |6 D# z+ W; r% I- X    // order of iteration through the `heatbugList' will be' ?2 `8 k& Y+ H
    // identical (assuming the list order is not changed3 w+ ]- H' S3 o1 V; R2 B
    // indirectly by some other process).
) K5 Z( E2 d" z      P' a$ o8 |: [# w9 V* d( i
    modelActions = new ActionGroupImpl (getZone ());
8 w; K# @2 |+ M7 T. }4 V
% U% p* l" j- p. V7 W$ v' C1 V8 E    try {
; |3 E$ Z; _" |# c  T      modelActions.createActionTo$message
9 ?# V& x+ V7 v  `; X6 _; `: X        (heat, new Selector (heat.getClass (), "stepRule", false));# t/ g$ S, l. {9 w/ z
    } catch (Exception e) {
( i! W5 z5 W! Q' D$ O      System.err.println ("Exception stepRule: " + e.getMessage ());- r/ |9 X4 Z; u/ k3 |
    }; x8 f9 i" V; i1 K

' I) W. G! e8 R# \, l    try {. U) }  [3 I$ t! A2 g+ I
      Heatbug proto = (Heatbug) heatbugList.get (0);0 n3 j5 y  I! Q/ r5 F- {( }& v) q4 N# o
      Selector sel =
0 |$ H5 }' f8 G' r& p. I        new Selector (proto.getClass (), "heatbugStep", false);
5 ^- c; m& `6 L1 \* g- w      actionForEach =; m, d- ~3 {6 k2 F' A8 |! H: o9 r4 h
        modelActions.createFActionForEachHomogeneous$call' V8 ~. A& \( p7 L$ _6 c
        (heatbugList,* w) H. S, }. l. N7 Z4 k
         new FCallImpl (this, proto, sel,
  ?$ @, P' S* d8 r" t                        new FArgumentsImpl (this, sel)));+ j- w4 w% N; A9 L$ a7 t
    } catch (Exception e) {+ P2 s9 T8 w4 T* {) p: D
      e.printStackTrace (System.err);7 i  v. }1 @" e" I& P. P
    }# X* t6 ]4 D7 L+ `$ m6 P
    , a0 U5 [, c) R0 b7 j( p
    syncUpdateOrder ();( d9 c4 I$ B" d4 |' K! o# p
8 e  b# ]* W* y8 }- s
    try {/ ~0 Y2 c+ \% v- J( w; L
      modelActions.createActionTo$message
9 n2 ~  E# @. R8 p8 @        (heat, new Selector (heat.getClass (), "updateLattice", false));  _+ b0 k  f) P. Q
    } catch (Exception e) {' s% M- c  _! g8 S! j
      System.err.println("Exception updateLattice: " + e.getMessage ());. D# q# h) v. w3 w) c( c! h8 O
    }$ }" J4 a  t; Z/ W
        9 V$ D' q& r1 Y- D% I. K* |6 ?: C
    // Then we create a schedule that executes the
& T7 l" k3 r; l2 H5 K5 _% s    // modelActions. modelActions is an ActionGroup, by itself it9 c% K9 K  R" \+ ^  p# o
    // has no notion of time. In order to have it executed in9 T4 z: [) y: ^5 Y7 R! r# p6 e, l
    // time, we create a Schedule that says to use the
) P* G" _6 L" q$ o8 _$ W0 c    // modelActions ActionGroup at particular times.  This% A1 F9 x2 Z5 Z, \3 Y# H
    // schedule has a repeat interval of 1, it will loop every/ S9 F8 j' `- E9 e
    // time step.  The action is executed at time 0 relative to  s: b9 _& X' g0 A, @1 }$ A
    // the beginning of the loop.- n; L0 C1 o+ u6 _: b  }
& `1 ^4 o, I1 r+ C, |, N
    // This is a simple schedule, with only one action that is
) v  l/ U: T7 s1 i    // just repeated every time. See jmousetrap for more
9 L6 C& K0 x1 K" D/ S    // complicated schedules.5 Z) Y' y* C; ^  M6 R( r) O
  
8 k( N' C4 C5 ]& F7 s1 H; Y, y    modelSchedule = new ScheduleImpl (getZone (), 1);3 C/ f: V( l1 f" J) x
    modelSchedule.at$createAction (0, modelActions);2 w1 R+ r9 m0 j* |! p0 I4 N( r
        
: X( w* k, {" H! N5 D* U. E  _    return this;
# Q% \9 n: q6 @; ^, x0 F  }
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