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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 () {
5 b, n. j( I3 z, i. _6 e/ k    super.buildActions();
% v. S+ o% H5 {! I: \5 Y' _) a    4 \8 D0 z9 Y7 ]1 L: M, h
    // Create the list of simulation actions. We put these in8 B4 Q1 S) r" }$ {8 K1 Z. ^
    // an action group, because we want these actions to be6 |- _8 j6 y, T; @, B& m3 X
    // executed in a specific order, but these steps should/ a5 ]; \* o' V
    // take no (simulated) time. The M(foo) means "The message6 L6 p" [% ?3 V  W8 c
    // called <foo>". You can send a message To a particular6 {8 A2 H; a2 s! }1 o1 |/ ~# q( u
    // object, or ForEach object in a collection.
# E# @+ v7 d1 J' a7 L- W        " U5 W0 z' r; H4 `% ^6 |
    // Note we update the heatspace in two phases: first run  q" ~, S0 n6 E' D6 b: U  L5 t, d
    // diffusion, then run "updateWorld" to actually enact the
" X1 E4 o  h1 V" `: q0 G, Q    // changes the heatbugs have made. The ordering here is* R8 u6 N9 @8 m3 X% c. |) h
    // significant!7 B5 q: U3 e! T' h) a
        & P' P. _  o5 y/ f* }
    // Note also, that with the additional1 i' q/ y& U% C
    // `randomizeHeatbugUpdateOrder' Boolean flag we can8 B: W, i/ V% @
    // randomize the order in which the bugs actually run9 j% D" M; g3 A" R. c; e5 X
    // their step rule.  This has the effect of removing any( m+ L) d* o6 g; W
    // systematic bias in the iteration throught the heatbug
, }4 o+ v: v+ X5 `, p6 y  e    // list from timestep to timestep' D" B% g) v* f5 V
        9 V( o- X' O* M/ n# K! V3 A
    // By default, all `createActionForEach' modelActions have2 |  ]* E) R1 j( c
    // a default order of `Sequential', which means that the
& s( m/ ^1 C' V. z  [* C7 j5 W5 X    // order of iteration through the `heatbugList' will be
1 i. U, d6 S, l5 |    // identical (assuming the list order is not changed
" |/ L+ z  h# V5 c8 g$ k    // indirectly by some other process).
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    modelActions = new ActionGroupImpl (getZone ());2 _# Q! B$ s* _4 }5 F
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    try {0 I4 u' ~% m$ ?& u! r
      modelActions.createActionTo$message0 r: r: l* H9 O- E3 d' W" L
        (heat, new Selector (heat.getClass (), "stepRule", false));' E) n- e& u! F' Z$ t' `
    } catch (Exception e) {4 j; Z& \* _! S
      System.err.println ("Exception stepRule: " + e.getMessage ());# v! k1 E4 y) |/ j9 ]" {
    }
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    try {
7 i3 \9 z( U0 {; ?2 y$ k      Heatbug proto = (Heatbug) heatbugList.get (0);
/ s  w. S4 a( q: J! u5 g& \* N      Selector sel = * [: D6 h% ]: d$ G5 A0 {5 T
        new Selector (proto.getClass (), "heatbugStep", false);
  P- u  D( q  C9 X  _      actionForEach =0 \( v% X: j: u4 }1 a4 t, U
        modelActions.createFActionForEachHomogeneous$call, P1 Y# b7 Q6 K& W
        (heatbugList,5 d: H3 j! U2 Q4 k
         new FCallImpl (this, proto, sel,: ?; o/ N  S: V
                        new FArgumentsImpl (this, sel)));7 H( _* t  O1 K
    } catch (Exception e) {
2 d$ D6 _# {, t      e.printStackTrace (System.err);$ W/ c# j, G3 S( q% O; p5 f) e- ^1 n3 m
    }
$ P; c; T/ P$ y# I9 e    ' }) F; m9 x; X4 p. ?
    syncUpdateOrder ();3 Q; ]5 Q. u2 P9 H9 b( c; s

. N2 p- T6 j. J" x! W: n- E  o    try {
, a% m4 _% \  j5 P) f      modelActions.createActionTo$message - ~* Q/ s6 D; B5 w- a3 }: N
        (heat, new Selector (heat.getClass (), "updateLattice", false));
0 K" t! }, R& W7 |    } catch (Exception e) {
- n6 k. v* t. W+ P8 E; T7 g      System.err.println("Exception updateLattice: " + e.getMessage ());3 W" u. z! j/ [4 a* m
    }
0 P$ G+ n) d' N" w        ( T: N0 b5 I" t6 ]
    // Then we create a schedule that executes the1 X, Z) U3 a1 k
    // modelActions. modelActions is an ActionGroup, by itself it
! K. f/ v0 V/ \, L! ^2 Q( x    // has no notion of time. In order to have it executed in
3 q, y0 X. S8 u' h' [    // time, we create a Schedule that says to use the
& f( \$ f: Z" Y, o0 X    // modelActions ActionGroup at particular times.  This
' l' S  d" V( n# Q1 X( v7 [    // schedule has a repeat interval of 1, it will loop every7 J! L  }. T) J& r! F4 o/ o4 G5 N
    // time step.  The action is executed at time 0 relative to1 E0 \2 c) P/ c
    // the beginning of the loop.
6 r6 k. F4 V8 z/ t/ o0 N7 ]; V5 D$ S& }$ M5 H+ `
    // This is a simple schedule, with only one action that is5 n; M' V) Z( K, Q3 n% z  Y! X' n
    // just repeated every time. See jmousetrap for more: d' y- g. l+ O& W, W& Y1 z
    // complicated schedules.  T% h; c9 G& W2 K
  & v1 [8 C. Y0 a* A9 t- K
    modelSchedule = new ScheduleImpl (getZone (), 1);
6 l" P- o' k5 t% u) ]3 x    modelSchedule.at$createAction (0, modelActions);
( k3 ]9 B" \+ N9 G, e8 @6 ^2 y        # c5 n! m, g5 U1 f( `
    return this;
) r( h/ U' |, R% R& Q' J9 f. B* E  }
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