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MethodInterceptor
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SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD>
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org.aopalliance.intercept</FONT>
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Interface MethodInterceptor</H2>
<DL>
<DT><B>All Superinterfaces:</B> <DD><A HREF="../../../org/aopalliance/aop/Advice.html" title="interface in org.aopalliance.aop">Advice</A>, <A HREF="../../../org/aopalliance/intercept/Interceptor.html" title="interface in org.aopalliance.intercept">Interceptor</A></DD>
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<DT><PRE>public interface <B>MethodInterceptor</B><DT>extends <A HREF="../../../org/aopalliance/intercept/Interceptor.html" title="interface in org.aopalliance.intercept">Interceptor</A></DL>
</PRE>
<P>
Intercepts calls on an interface on its way to the target. These
are nested "on top" of the target.
<p>The user should implement the <A HREF="../../../org/aopalliance/intercept/MethodInterceptor.html#invoke(org.aopalliance.intercept.MethodInvocation)"><CODE>invoke(MethodInvocation)</CODE></A>
method to modify the original behavior. E.g. the following class
implements a tracing interceptor (traces all the calls on the
intercepted method(s)):
<pre class=code>
class TracingInterceptor implements MethodInterceptor {
Object invoke(MethodInvocation i) throws Throwable {
System.out.println("method "+i.getMethod()+" is called on "+
i.getThis()+" with args "+i.getArguments());
Object ret=i.proceed();
System.out.println("method "+i.getMethod()+" returns "+ret);
return ret;
}
}
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<B>Method Summary</B></FONT></TH>
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<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/aopalliance/intercept/MethodInterceptor.html#invoke(org.aopalliance.intercept.MethodInvocation)">invoke</A></B>(<A HREF="../../../org/aopalliance/intercept/MethodInvocation.html" title="interface in org.aopalliance.intercept">MethodInvocation</A> invocation)</CODE>
<BR>
Implement this method to perform extra treatments before and
after the invocation.</TD>
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<A NAME="invoke(org.aopalliance.intercept.MethodInvocation)"><!-- --></A><H3>
invoke</H3>
<PRE>
java.lang.Object <B>invoke</B>(<A HREF="../../../org/aopalliance/intercept/MethodInvocation.html" title="interface in org.aopalliance.intercept">MethodInvocation</A> invocation)
throws java.lang.Throwable</PRE>
<DL>
<DD>Implement this method to perform extra treatments before and
after the invocation. Polite implementations would certainly
like to invoke <A HREF="../../../org/aopalliance/intercept/Joinpoint.html#proceed()"><CODE>Joinpoint.proceed()</CODE></A>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>invocation</CODE> - the method invocation joinpoint
<DT><B>Returns:</B><DD>the result of the call to <A HREF="../../../org/aopalliance/intercept/Joinpoint.html#proceed()"><CODE>Joinpoint.proceed()</CODE></A>, might be intercepted by the
interceptor.
<DT><B>Throws:</B>
<DD><CODE>java.lang.Throwable</CODE> - if the interceptors or the
target-object throws an exception.</DL>
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