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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:8 ~1 B5 \! M* m- s2 ?6 {: ^
: ]' D6 O0 q; n0 j- c* \2 N) b$ y
public Object buildActions () {
3 X8 }* W* t) q6 x    super.buildActions();
7 q* c/ A7 \  \: k0 Z+ W5 \    , Z7 X. h3 Z& U& l
    // Create the list of simulation actions. We put these in( a( K( w+ z; m5 x& _- E2 z
    // an action group, because we want these actions to be
  B# L# d( }% r8 R2 }0 l; @+ Q7 J    // executed in a specific order, but these steps should1 V+ \8 y, ^* V
    // take no (simulated) time. The M(foo) means "The message
2 v& }. \8 d$ _9 b    // called <foo>". You can send a message To a particular
, z4 _& o) G6 M. h! M5 v  `    // object, or ForEach object in a collection.; m0 E4 D. C* R- ~
        . b* d& ]6 O2 {% E! y/ P8 ^- D
    // Note we update the heatspace in two phases: first run
+ X) b9 E/ W9 h1 H) r/ Z    // diffusion, then run "updateWorld" to actually enact the
, C  y; A/ ^* p* p    // changes the heatbugs have made. The ordering here is
+ g( f5 L. `/ c9 o4 o: |    // significant!7 d: c3 b: A6 `9 p
        
6 i+ w" g8 {: G) l. @7 S9 o    // Note also, that with the additional
  r8 ?. Y% E; @0 y) O% U! `    // `randomizeHeatbugUpdateOrder' Boolean flag we can: e9 H% T4 t8 a& u+ j9 I
    // randomize the order in which the bugs actually run% d; x% r! m8 H0 |! s
    // their step rule.  This has the effect of removing any" `; F% S! h/ R9 I3 Q7 O$ z& D* k
    // systematic bias in the iteration throught the heatbug8 D' k# [; `1 g$ |
    // list from timestep to timestep3 ^% O: |& L  P2 z# [" g
        % {, ?" T; e: }  W2 P
    // By default, all `createActionForEach' modelActions have
& R4 j& ^" R7 ^$ {6 i6 K    // a default order of `Sequential', which means that the
. e- {1 m' ?- Q+ }    // order of iteration through the `heatbugList' will be/ o* i( Z# t  n- G1 t5 o
    // identical (assuming the list order is not changed
4 a- S0 x' n; H: F4 E  Q4 \! I5 P    // indirectly by some other process).8 a. n) z9 {9 T  C3 |% c  `+ p$ @
    ( @  V4 J( \# n- v2 I% @% _
    modelActions = new ActionGroupImpl (getZone ());
6 s+ I) P4 B) _7 _: |) T
/ k& b4 Z2 \, q6 H! z* }1 x% A    try {( X, [9 @& G4 K6 E3 k
      modelActions.createActionTo$message( R% u7 |; `+ ^, x: ?- |; f
        (heat, new Selector (heat.getClass (), "stepRule", false));9 f8 b' p7 O8 t
    } catch (Exception e) {1 j1 b3 `5 K" m# |! [3 D
      System.err.println ("Exception stepRule: " + e.getMessage ());5 h- T# e. E7 l- ?0 V. v
    }6 m0 K& w* i: p% T' U0 @

% _& n9 }3 ~3 p9 v    try {/ J8 \6 y0 P1 u9 I
      Heatbug proto = (Heatbug) heatbugList.get (0);
3 U3 ?9 M6 d7 h( {# p      Selector sel = 6 E% d3 u1 Q: V+ ^: c- w
        new Selector (proto.getClass (), "heatbugStep", false);1 w# y; L$ K% t9 u
      actionForEach =/ V9 d2 G9 f( k
        modelActions.createFActionForEachHomogeneous$call
. b0 K. Y1 M0 {2 v        (heatbugList,
3 E6 @2 m9 v# F- b0 }2 U8 T         new FCallImpl (this, proto, sel,
' ~  m1 [& B; Z1 u: }                        new FArgumentsImpl (this, sel)));$ c2 E9 u  @: I& _3 O8 y
    } catch (Exception e) {! U- t& q1 d! c( `) `1 o
      e.printStackTrace (System.err);
3 Z, e1 k7 y; f* C& J! b    }1 c. h' f$ H; ]; s) W/ Z5 I
    ; Z; ~0 k' x! a* N6 j3 w
    syncUpdateOrder ();5 X" N6 Z# C9 C% _
- f% N' D+ k% I% `
    try {, i: e9 C, v# V- j2 X6 p: i4 o3 t
      modelActions.createActionTo$message 6 A/ I, e2 W- k* E6 z, N
        (heat, new Selector (heat.getClass (), "updateLattice", false));
3 x4 I1 D: J7 w0 D& {0 V; z8 ~    } catch (Exception e) {
& g8 k) M% S( _: y1 W      System.err.println("Exception updateLattice: " + e.getMessage ());; K. }- y4 y2 E# V: U* B- m9 N* _( t1 h
    }8 n' g9 q5 o4 [: p" r% W
        . r6 [# |& ^& U2 Y  O
    // Then we create a schedule that executes the% p6 ^2 J! v& l2 v1 p. O. ?" _
    // modelActions. modelActions is an ActionGroup, by itself it
# q9 X8 p  w1 D* v* ?$ I    // has no notion of time. In order to have it executed in
% Z/ b! i2 [$ F9 t$ w% `6 _: B    // time, we create a Schedule that says to use the. Z( \. r! H- {: n8 @; ?- z
    // modelActions ActionGroup at particular times.  This
& r2 j" ?5 k7 h    // schedule has a repeat interval of 1, it will loop every
# E4 A5 j! [7 H3 L    // time step.  The action is executed at time 0 relative to
: a/ w% f; ?. o    // the beginning of the loop.
4 x( r, S3 N( w: j+ M
% J/ r1 A3 l" z, S    // This is a simple schedule, with only one action that is
/ V! W8 [, o  s+ k  m) j    // just repeated every time. See jmousetrap for more; v* R  E1 X' I: p% d7 u+ g# b. N
    // complicated schedules.
8 t6 l( C: y' k# \; v  
' E7 e' ]9 V% ]$ h/ D* R" k4 \    modelSchedule = new ScheduleImpl (getZone (), 1);3 N7 t8 i) f7 P" P
    modelSchedule.at$createAction (0, modelActions);- J9 n$ h3 |3 i
        $ n/ K0 I; i0 ?: V
    return this;9 Y- c5 t. z0 q  `* U! t" Q8 \+ |
  }
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