Hibernate Envers

[Tushar Bhasme]

I am trying to use  hibernate's envers functionality in my app. I though need to inject one of my services to implementation of RevisionListner.
I can't figure out how and where to bind the RevisionListner to Guice.

Thanks,
Tushar

[nage...@gmail.com]

The only working way we found was this:

package something;

import java.io.Serializable;
import java.util.Collections;
import java.util.Set;
import java.util.stream.Collectors;

import org.hibernate.envers.DefaultRevisionEntity;
import org.hibernate.envers.EntityTrackingRevisionListener;
import org.hibernate.envers.RevisionType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.inject.Inject;
...

public class AuditListener implements EntityTrackingRevisionListener {

    private static final Logger log = LoggerFactory.getLogger(AuditListener.class);

    @Inject
    private RevMasterChangeDAO revMasterChangeDAO;

    public AuditListener() {
        super();
        // this is not created by guice but somehow instatiated by hibernate envers
        // therefore injection does not work out of the box
        // the following statement injects manually all members in this.
        // TODO find a better way to integrate this in guice

        try {
            InjectorHolder.getInjector()
                          .injectMembers(this);
        } catch (Exception e) {
            log.warn(e.getMessage(), e);
        }

    }

    public AuditListener(boolean dontInject) {
        super();
        // use this constructor for tests, if mocks are injected with and via mockito
    }
snip

InjectorHolder looks like this:

/**
 * Holds instance of the Guice injector. Should be filled after initialization
 * of Injector (after calling createInjector())
 */
public final class InjectorHolder {

    private static Injector staticInjector;

    private InjectorHolder() {
    }

    public static void setInjector(Injector injector) {
        staticInjector = injector;
    }

    public static Injector getInjector() {
        return staticInjector;
    }

[tushar bhasme]

Yes, this is the exact solution that I just found!

I also created a helper class and set its Injector from GuiceServletContextListener when it gets initialized.

Thanks,
Tushar Bhasme

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