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:2 M- @4 [9 U( [/ L; [7 \3 @- z4 Y
: x3 l% S$ V8 i* J public Object buildActions () {
- t- ~' j6 z2 q: U4 [. o. N- f8 ^ super.buildActions();
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// Create the list of simulation actions. We put these in
- [4 ]# Q9 s N# ^ r% E // an action group, because we want these actions to be% X$ o4 ~( j: A0 h& l" x$ K
// executed in a specific order, but these steps should
+ O+ e- }- d* r8 B# ^( p // take no (simulated) time. The M(foo) means "The message
{$ W% g1 E& E, a // called <foo>". You can send a message To a particular
4 w7 l# a# q& W' V* s% J/ s // object, or ForEach object in a collection.4 }6 r4 o* k7 O5 \
7 u2 K8 Q+ F' [4 v% E // Note we update the heatspace in two phases: first run
% j% m( ]9 w" ]8 b) q2 {+ M# X // diffusion, then run "updateWorld" to actually enact the( E( o) y. \1 K9 O' w+ r
// changes the heatbugs have made. The ordering here is
& q i; g6 q+ I5 v0 }- Y/ s // significant!1 W1 w- _: X" {+ ^3 g
' i2 N/ o3 L5 _' _8 z // Note also, that with the additional
& W; g. J* s- [0 K' I // `randomizeHeatbugUpdateOrder' Boolean flag we can' k8 `8 J; q1 p: `7 R8 O
// randomize the order in which the bugs actually run" l4 |3 _. Z: j
// their step rule. This has the effect of removing any* @ D# { Q/ D
// systematic bias in the iteration throught the heatbug3 p O$ I, b9 x4 T
// list from timestep to timestep# T" d W! ~( v: {- V- k' u! j
$ M! R9 e: V6 N2 p // By default, all `createActionForEach' modelActions have
, M {$ O: P4 H6 b! ]; X // a default order of `Sequential', which means that the
7 i* d4 L- p- d5 H" G" N, Q // order of iteration through the `heatbugList' will be! D* h) T! ~2 {% j- P$ @
// identical (assuming the list order is not changed! l9 P7 x* X8 h: L
// indirectly by some other process).9 y, m5 T' k. D# n, P8 w6 j
" A* k2 ]; k8 z! L: C modelActions = new ActionGroupImpl (getZone ());
# p3 H+ N F z8 M
" O9 Y, e1 e/ T8 m7 T6 e0 Q try {
0 |6 x* V( S. H' U' [' z modelActions.createActionTo$message
# k l" p( V. {# m: C (heat, new Selector (heat.getClass (), "stepRule", false));3 c: m) _; u! X. Z8 B% F# u" d
} catch (Exception e) {
5 F# U( w- w7 ^) G, L System.err.println ("Exception stepRule: " + e.getMessage ());$ a6 v/ c! _, m
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try {$ G+ G) |: k2 W. n+ r
Heatbug proto = (Heatbug) heatbugList.get (0);1 F _( M- H8 B V: y) e' {
Selector sel =
! W1 O$ {/ D T3 U3 @ new Selector (proto.getClass (), "heatbugStep", false);' B' k/ Z( U% L& w3 q
actionForEach =
: l% R1 P7 @' V5 n modelActions.createFActionForEachHomogeneous$call8 x$ y) a" Q6 `' Y I% ^" v
(heatbugList,
" a) U" [: p) j6 f new FCallImpl (this, proto, sel,
/ n% C( c8 j7 K. y4 V) } new FArgumentsImpl (this, sel)));: P8 Z) }: v: t1 I c3 g* D. p
} catch (Exception e) {$ Y( w2 b/ p9 f; _: O
e.printStackTrace (System.err);
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9 C9 k- X7 x# J3 {# `9 \ syncUpdateOrder ();
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% @0 Y1 Y( A Y try {, M3 L5 x0 a6 G! y O7 w+ ?
modelActions.createActionTo$message
' {5 p7 d f' i+ n( x) `. c$ G7 N (heat, new Selector (heat.getClass (), "updateLattice", false));
* m' {. I9 P d. M$ z& _2 e } catch (Exception e) {: R; u4 G6 i$ E
System.err.println("Exception updateLattice: " + e.getMessage ());
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+ B$ H: N- i x% @3 a // Then we create a schedule that executes the
+ q" Q1 C+ F9 |5 A. n, L% [# y4 ~+ V // modelActions. modelActions is an ActionGroup, by itself it9 B7 |; W/ P; }/ P* q) X( p3 i
// has no notion of time. In order to have it executed in$ x1 ]% L. r1 G1 C
// time, we create a Schedule that says to use the
2 m/ V: Q8 h8 f // modelActions ActionGroup at particular times. This
. F2 h0 v# T" o7 v+ [ // schedule has a repeat interval of 1, it will loop every/ M& c, F- O% o
// time step. The action is executed at time 0 relative to0 U; p$ |; t' V$ n' e% s4 `6 A
// the beginning of the loop.: V0 |% h. l: x; k0 R: t
% \2 o# c/ f, Z2 s# n+ `* x // This is a simple schedule, with only one action that is% a+ ]' W% U1 K
// just repeated every time. See jmousetrap for more
! b, a- ~4 _) ], ~0 z // complicated schedules.
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modelSchedule = new ScheduleImpl (getZone (), 1);
" A7 K7 y6 I+ C+ _7 m+ q1 J modelSchedule.at$createAction (0, modelActions);
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. k1 c) q: l8 s& ^- [ return this;
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