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Wiki article: http://community.jboss.org/docs/DOC-15574 Source location: http://github.com/jbossejb3/oreilly-ejb-6thedition-book-examples/tree/ master/ch18-interceptors/
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Following is a full listing of all source code used in this runnable example.
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AuditedInvocation.java
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package org.jboss.ejb3.examples.ch18.tuner; import java.security.Principal; import javax.interceptor.InvocationContext; /** * Data object encapsulating the auditable properties behind an invocation * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @version $Revision: $ */ public class AuditedInvocation { //--------------------------------------------------------------------------|| // Instance Members --------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Invoked context */ private final InvocationContext context; /** * Caller */ private final Principal caller; //--------------------------------------------------------------------------|| // Constructor -------------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Creates a new instance */ AuditedInvocation(final InvocationContext context, final Principal caller) { // Precondition checks assert context != null : "context must be specified"; assert caller != null : "caller must be specified";
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692 | Appendix I: Interceptors: TV Channel Service Example
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// Set this.context = context; this.caller = caller;
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//--------------------------------------------------------------------------|| // Functional Methods ------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * @return the context */ public InvocationContext getContext() { return context; } /** * @return the caller */ public Principal getCaller() { return caller; } }
CachingAuditor.java
package org.jboss.ejb3.examples.ch18.tuner; import import import import import import import import import java.security.Principal; java.util.Collections; java.util.List; java.util.concurrent.CopyOnWriteArrayList; java.util.logging.Logger; javax.annotation.Resource; javax.ejb.SessionContext; javax.interceptor.AroundInvoke; javax.interceptor.InvocationContext;
/** * Aspect which keeps a cache of all intercepted * invocations in a globally accessible cache. * * Though demonstrative for testing and learning purposes, this is a very * poor example of a real-world auditing mechanism. In a production environment, * the copy-on-write nature of the cache will degrade geometrically * over time, and additionally we export mutable views * (ie. {@link InvocationContext#setParameters(Object[])}) to callers * of {@link CachingAuditor#getInvocations()}. *
* @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @version $Revision: $ */ public class CachingAuditor { //--------------------------------------------------------------------------|| // Class Members -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Logger */ private static final Logger log = Logger.getLogger(CachingAuditor.class.get Name()); /** * Cached invocations; must be in a thread-safe implementation because this member * is shared by all interceptor instances, which are linked to bean instances. Though * each bean instance is guaranteed to be used by only one thread at once, many bean instances * may be executed concurrently. */ private static final List<AuditedInvocation> invocations = new CopyOnWrite ArrayList<AuditedInvocation>(); //--------------------------------------------------------------------------|| // Instance Members --------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * The current EJB Context; will either be injected by the EJB Container or * manually populated by unit tests */ @Resource SessionContext beanContext; //--------------------------------------------------------------------------|| // Required Implementations ------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Caches the intercepted invocation in an auditable view such that * it may later be obtained */ @AroundInvoke public Object audit(final InvocationContext invocationContext) throws Exception { // Precondition checks assert invocationContext != null : "Context was not specified"; // Obtain the caller Principal caller;
694 | Appendix I: Interceptors: TV Channel Service Example
try {
caller = beanContext.getCallerPrincipal(); } catch (final NullPointerException npe) { caller = new Principal() { @Override public String getName() { return "Unauthenticated Caller"; }
}
};
// Create a new view final AuditedInvocation audit = new AuditedInvocation(invocationContext, caller); // Add the invocation to the cache invocations.add(audit); // Carry out the invocation, noting where we've intercepted before and after the call (around it) try { // Log log.info("Intercepted: " + invocationContext); // Return return invocationContext.proceed();
} finally { // Log log.info("Done with: " + invocationContext); } } //--------------------------------------------------------------------------|| // Functional Methods ------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Returns a read-only view of the {@link InvocationContext} * cached by this interceptor */ public static List<AuditedInvocation> getInvocations() {
}
// Copy on export return Collections.unmodifiableList(invocations);
}
/** * Test-only hook to clear the invocations */ static void clearInTesting() { invocations.clear(); }
Channel2AccessPolicy.java
package org.jboss.ejb3.examples.ch18.tuner; /** * Defines the authoritative policy governing whether or not * Channel 2 should be currently accessible * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @version $Revision: $ */ public class Channel2AccessPolicy { //--------------------------------------------------------------------------|| // Class Members -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Flag dictating whether or not Channel 2 should be shown */ private static boolean channel2Permitted = false; //--------------------------------------------------------------------------|| // Constructor -------------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * No instantiation */ private Channel2AccessPolicy() { throw new UnsupportedOperationException("No instances permitted"); }
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