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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:5 p. I! T5 }1 n5 |: Q; E
/ W- W% T% M, e
public Object buildActions () {
$ O: N- x# F0 `    super.buildActions();
6 n! n; V% }: q   
, R# \- m+ I" z  G1 I( A# u    // Create the list of simulation actions. We put these in! y9 P5 S/ H1 x# g: C7 G* W7 m9 ]
    // an action group, because we want these actions to be
% t5 t8 ]3 h% p& |) D/ g+ z    // executed in a specific order, but these steps should! V! z8 S1 f# D% o  I8 O
    // take no (simulated) time. The M(foo) means "The message- D/ R) ~& T- B& T
    // called <foo>". You can send a message To a particular3 R* @) X8 h; t
    // object, or ForEach object in a collection.
. M; ^4 H* B4 ]! Q        ) \" I: v$ ~4 Z- c6 V( W! q
    // Note we update the heatspace in two phases: first run; m3 d" h+ A" D9 M
    // diffusion, then run "updateWorld" to actually enact the3 `0 j: P4 E4 q3 ]( _, z0 K
    // changes the heatbugs have made. The ordering here is) z7 C) `. T% _6 h( s3 E7 g
    // significant!
# q, V+ f' e4 g        
) n, F; D" m3 F    // Note also, that with the additional
1 G* P4 e: z4 `' C+ z    // `randomizeHeatbugUpdateOrder' Boolean flag we can/ L( c8 I5 o. J2 u
    // randomize the order in which the bugs actually run" e  K2 q1 ?) b$ z% r8 j- f
    // their step rule.  This has the effect of removing any
* u0 U7 E( b& Y! o$ z4 I    // systematic bias in the iteration throught the heatbug! r- L5 S" I; A/ h  r+ G  d4 D
    // list from timestep to timestep
) }/ i: R8 [! J5 M3 [        
+ I; ?" C' \7 l8 r    // By default, all `createActionForEach' modelActions have8 B) O- h  S! i8 I  y
    // a default order of `Sequential', which means that the8 c2 Q2 T' B. _+ m  e/ o! d" i! E+ A2 E# y
    // order of iteration through the `heatbugList' will be
6 O2 N, d3 P' V, E& S    // identical (assuming the list order is not changed
: V- V! ], Y" J6 G- m5 c; H    // indirectly by some other process).; Z+ J# P; o6 U; K
    5 {  ]. I9 F) E: Q
    modelActions = new ActionGroupImpl (getZone ());4 J& l9 r' X8 y* k* R
# g4 s0 K& V* P$ ~0 f' N
    try {
: o' a+ [( M9 a/ c2 `      modelActions.createActionTo$message9 N# m2 D$ M2 g0 @& L3 I
        (heat, new Selector (heat.getClass (), "stepRule", false));
( w, t7 [  _" q( S! ?0 }4 u    } catch (Exception e) {
) \$ H2 Q) \3 J8 D7 X( v/ g2 }      System.err.println ("Exception stepRule: " + e.getMessage ());+ W! ?3 q0 v6 s% P
    }  S# q6 e7 {; K3 w5 J
  {$ E. w. y4 y4 K/ U# |1 `
    try {
( [4 Q3 r9 q2 q  Q# \      Heatbug proto = (Heatbug) heatbugList.get (0);7 M) @4 F" V5 Q' u1 B* }( ~
      Selector sel = $ c! L6 [. K$ f
        new Selector (proto.getClass (), "heatbugStep", false);7 n4 Z% [- R, E4 s
      actionForEach =
& f0 _  f0 Z' w8 W+ x* S        modelActions.createFActionForEachHomogeneous$call
0 p8 G7 t5 G5 w$ `1 q; e  K1 r3 }        (heatbugList,1 U2 {& r  l& p0 X
         new FCallImpl (this, proto, sel,
6 p5 F9 F" |2 A( A1 Q                        new FArgumentsImpl (this, sel)));& }0 |* ~5 h) E$ V: S9 ^- c% q$ i
    } catch (Exception e) {
6 }% s: f, l, y. H: p      e.printStackTrace (System.err);
0 c, f2 t; m# ?2 \: u    }
: K" c, M% y3 {8 f; ?3 q   
& a( w4 S  B: T/ g# i9 j# C    syncUpdateOrder ();3 m3 N' K, M, v
. \0 Q; J) @8 v( O* n
    try {0 R8 ]% z/ I" j
      modelActions.createActionTo$message - Z. O' `1 M& y- I6 ?: c5 C
        (heat, new Selector (heat.getClass (), "updateLattice", false));& S+ m- \) L6 Y3 I: n3 i& s- {+ D
    } catch (Exception e) {, O6 w* u# \& r! h
      System.err.println("Exception updateLattice: " + e.getMessage ());% d5 N7 m$ `! y$ }) _
    }
) i/ S+ L  s' W2 A        : J5 x- x( ^$ L( M
    // Then we create a schedule that executes the
/ C9 N0 _" q0 f/ \  z5 G. Y. x. ?+ u    // modelActions. modelActions is an ActionGroup, by itself it$ q) ]: m9 w4 t" q" d; f
    // has no notion of time. In order to have it executed in
( \7 R2 l! u% \$ P: r) `    // time, we create a Schedule that says to use the; ~& c: k; V) Y0 H4 |: z
    // modelActions ActionGroup at particular times.  This
8 d* U" z/ q# \) f: B    // schedule has a repeat interval of 1, it will loop every
8 D3 F6 Y, P* |    // time step.  The action is executed at time 0 relative to$ M6 z' z; Y% `. [0 M" }4 E
    // the beginning of the loop.
/ _" D- H3 j  x& q+ q
6 m2 }5 u& F4 X" f7 [/ W    // This is a simple schedule, with only one action that is1 A% K  C6 E8 q, W" z" I& ~
    // just repeated every time. See jmousetrap for more5 b) j$ f( B7 `$ U4 u- x3 B4 @) C* o
    // complicated schedules.
" X( C+ B' l; [" X0 v  
' o3 _  j) Z+ U    modelSchedule = new ScheduleImpl (getZone (), 1);2 \: g: X+ y  ?) N: u$ u
    modelSchedule.at$createAction (0, modelActions);1 ?. X) s3 f9 D& v: \
        9 V5 s/ }- y. U* P
    return this;
: |& W- t+ o$ i) U8 z3 W( _3 z  i7 `  }
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