Hi,
this is a first attempt (having never written interceptors or annotation
before). Seems to work, but not ideal.
1. In my Interceptor I have no which interceptors need to be in Around and
Within
2. Ideally I would like to add my annotation to the method and not the type,
but for some reason I was unable to get that working
3. Ideally I would like to be able to specify the page where it should go.
Right now it stays on the same page, requiring a cancel from the user.
4. Massive unknows about killing the transaction and clearing the entitymanager
(I looked at Gavin's SeamExceptionFilter)
My annotation:
package csir.interceptor.seam;
|
| import java.lang.annotation.ElementType;
| import java.lang.annotation.Retention;
| import java.lang.annotation.RetentionPolicy;
| import java.lang.annotation.Target;
|
| import javax.ejb.Interceptors;
|
| @Target( { ElementType.TYPE })
| @Retention(RetentionPolicy.RUNTIME)
| @Interceptors(IfNAPExceptionInterceptor.class)
| public @interface IfNAPException {
| }
|
|
My interceptor
| package csir.interceptor.seam;
|
| import javax.ejb.AroundInvoke;
| import javax.ejb.InvocationContext;
| import javax.persistence.EntityManager;
|
| import org.apache.log4j.Logger;
| import org.jboss.seam.Component;
| import org.jboss.seam.annotations.Around;
| import org.jboss.seam.annotations.Within;
| import org.jboss.seam.interceptors.BijectionInterceptor;
| import org.jboss.seam.interceptors.BusinessProcessInterceptor;
| import org.jboss.seam.interceptors.ConversationInterceptor;
| import org.jboss.seam.interceptors.RemoveInterceptor;
| import org.jboss.seam.interceptors.ValidationInterceptor;
| import org.jboss.seam.util.Transactions;
|
| import csir.common.seam.NAPException;
|
| @Around( { BijectionInterceptor.class, ValidationInterceptor.class,
| ConversationInterceptor.class, BusinessProcessInterceptor.class
})
| @Within(RemoveInterceptor.class)
| public class IfNAPExceptionInterceptor {
|
| static final Logger logger = Logger
| .getLogger(IfNAPExceptionInterceptor.class);
|
| @AroundInvoke
| public Object customInterceptor(InvocationContext ctx) throws Exception
{
| logger.info("*** BEFORE INTERCEPTION ***");
| Object object = null;
| try {
| object = ctx.proceed();
| } catch (NAPException e) {
| EntityManager em = (EntityManager)
Component.getInstance(
| "napEntityManager", false);
| logger.error("Got NAPException");
| rollbackAfterException();
| em.clear();
| }
| logger.info("*** AFTER INTERCEPTION ***");
| return object;
| }
|
| private void rollbackAfterException() {
| try {
| if (Transactions.isTransactionActiveOrMarkedRollback())
{
| logger.info("killing transaction");
| Transactions.getUserTransaction().rollback();
| }
| } catch (Exception te) {
| logger.error("could not roll back transaction", te);
| }
| }
|
| }
|
as applied in the Stateful bean:
Stateful
| @IfNAPException
| @Name("serviceManagementBean")
| @Interceptors(SeamInterceptor.class)
| public class ServiceManagementBean implements Serializable,
ServiceManagement {
| .
| .
|
and the method throwing the NAPException
@IfInvalid(outcome = Outcome.REDISPLAY)
| public String save() throws Exception {
| try {
| logger.info("Saving edited/created service.");
| em.persist(service);
| em.flush();
| return "save";
| } catch (StaleObjectStateException e) {
| logger.error("Failed to persist service", e);
| FacesMessage facesMessage = new
FacesMessage(e.getMessage());
| facesContext.addMessage(null, facesMessage);
| throw new NAPException(e);
| }
| }
|
|
and finally the NAPException.
| package csir.common.seam;
|
| import java.io.Serializable;
|
| import javax.ejb.ApplicationException;
|
| @ApplicationException(rollback=true)
| public class NAPException extends Exception implements Serializable {
|
| /**
| *
| */
| private static final long serialVersionUID = -5617117494284445988L;
|
| public NAPException() {
| super();
| }
|
| public NAPException(String message) {
| super(message);
| }
|
| public NAPException(String message, Throwable cause) {
| super(message, cause);
| }
|
| public NAPException(Throwable cause) {
| super(cause);
| }
|
| }
I am sure this thing can be improved extensively.
Later
Louis
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