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An advanced email server - JPA backend with guice injection
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package org.apache.james.modules.mailbox;

import java.io.FileNotFoundException;
import java.util.HashMap;

import javax.inject.Singleton;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.james.JPAConfiguration;
import org.apache.james.adapter.mailbox.store.UserRepositoryAuthenticator;
import org.apache.james.adapter.mailbox.store.UserRepositoryAuthorizator;
import org.apache.james.mailbox.MailboxManager;
import org.apache.james.mailbox.MailboxPathLocker;
import org.apache.james.mailbox.SubscriptionManager;
import org.apache.james.mailbox.acl.GroupMembershipResolver;
import org.apache.james.mailbox.acl.MailboxACLResolver;
import org.apache.james.mailbox.acl.SimpleGroupMembershipResolver;
import org.apache.james.mailbox.acl.UnionMailboxACLResolver;
import org.apache.james.mailbox.exception.MailboxException;
import org.apache.james.mailbox.jpa.JPAId;
import org.apache.james.mailbox.jpa.JPAMailboxSessionMapperFactory;
import org.apache.james.mailbox.jpa.JPASubscriptionManager;
import org.apache.james.mailbox.jpa.mail.JPAModSeqProvider;
import org.apache.james.mailbox.jpa.mail.JPAUidProvider;
import org.apache.james.mailbox.jpa.openjpa.OpenJPAMailboxManager;
import org.apache.james.mailbox.model.MailboxId;
import org.apache.james.mailbox.model.MessageId;
import org.apache.james.mailbox.store.Authenticator;
import org.apache.james.mailbox.store.Authorizator;
import org.apache.james.mailbox.store.JVMMailboxPathLocker;
import org.apache.james.mailbox.store.MailboxSessionMapperFactory;
import org.apache.james.mailbox.store.mail.AttachmentMapperFactory;
import org.apache.james.mailbox.store.mail.MailboxMapperFactory;
import org.apache.james.mailbox.store.mail.MessageMapperFactory;
import org.apache.james.mailbox.store.mail.ModSeqProvider;
import org.apache.james.mailbox.store.mail.UidProvider;
import org.apache.james.mailbox.store.mail.model.DefaultMessageId;
import org.apache.james.modules.Names;
import org.apache.james.utils.MailboxManagerDefinition;
import org.apache.james.utils.PropertiesProvider;

import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import com.google.inject.Provides;
import com.google.inject.Scopes;
import com.google.inject.multibindings.Multibinder;
import com.google.inject.name.Named;

public class JPAMailboxModule extends AbstractModule {

    @Override
    protected void configure() {
        install(new JpaQuotaModule());

        bind(JPAMailboxSessionMapperFactory.class).in(Scopes.SINGLETON);
        bind(OpenJPAMailboxManager.class).in(Scopes.SINGLETON);
        bind(JVMMailboxPathLocker.class).in(Scopes.SINGLETON);
        bind(JPASubscriptionManager.class).in(Scopes.SINGLETON);
        bind(JPAModSeqProvider.class).in(Scopes.SINGLETON);
        bind(JPAUidProvider.class).in(Scopes.SINGLETON);
        bind(UserRepositoryAuthenticator.class).in(Scopes.SINGLETON);
        bind(UserRepositoryAuthorizator.class).in(Scopes.SINGLETON);
        bind(JPAId.Factory.class).in(Scopes.SINGLETON);
        bind(SimpleGroupMembershipResolver.class).in(Scopes.SINGLETON);
        bind(UnionMailboxACLResolver.class).in(Scopes.SINGLETON);
        bind(DefaultMessageId.Factory.class).in(Scopes.SINGLETON);

        bind(MessageMapperFactory.class).to(JPAMailboxSessionMapperFactory.class);
        bind(MailboxMapperFactory.class).to(JPAMailboxSessionMapperFactory.class);
        bind(AttachmentMapperFactory.class).to(JPAMailboxSessionMapperFactory.class);
        bind(MailboxSessionMapperFactory.class).to(JPAMailboxSessionMapperFactory.class);
        bind(MessageId.Factory.class).to(DefaultMessageId.Factory.class);

        bind(ModSeqProvider.class).to(JPAModSeqProvider.class);
        bind(UidProvider.class).to(JPAUidProvider.class);
        bind(SubscriptionManager.class).to(JPASubscriptionManager.class);
        bind(MailboxPathLocker.class).to(JVMMailboxPathLocker.class);
        bind(Authenticator.class).to(UserRepositoryAuthenticator.class);
        bind(MailboxManager.class).to(OpenJPAMailboxManager.class);
        bind(Authorizator.class).to(UserRepositoryAuthorizator.class);
        bind(MailboxId.Factory.class).to(JPAId.Factory.class);
        bind(GroupMembershipResolver.class).to(SimpleGroupMembershipResolver.class);
        bind(MailboxACLResolver.class).to(UnionMailboxACLResolver.class);
        
        Multibinder.newSetBinder(binder(), MailboxManagerDefinition.class).addBinding().to(JPAMailboxManagerDefinition.class);
    }

    @Provides @Named(Names.MAILBOXMANAGER_NAME) @Singleton
    public MailboxManager provideMailboxManager(OpenJPAMailboxManager jpaMailboxManager) throws MailboxException {
        jpaMailboxManager.init();
        return jpaMailboxManager;
    }
    
    @Singleton
    private static class JPAMailboxManagerDefinition extends MailboxManagerDefinition {
        @Inject
        private JPAMailboxManagerDefinition(OpenJPAMailboxManager manager) {
            super("jpa-mailboxmanager", manager);
        }
    }
    
    @Provides
    @Singleton
    public EntityManagerFactory provideEntityManagerFactory(JPAConfiguration jpaConfiguration) {
        HashMap properties = new HashMap();
        
        properties.put("openjpa.ConnectionDriverName", jpaConfiguration.getDriverName());
        properties.put("openjpa.ConnectionURL", jpaConfiguration.getDriverURL());

        return Persistence.createEntityManagerFactory("Global", properties);

    }

    @Provides
    @Singleton
    JPAConfiguration provideConfiguration(PropertiesProvider propertiesProvider) throws FileNotFoundException, ConfigurationException{
        PropertiesConfiguration dataSource = propertiesProvider.getConfiguration("james-database");
        return JPAConfiguration.builder()
                .driverName(dataSource.getString("database.driverClassName"))
                .driverURL(dataSource.getString("database.url"))
                .build();
    }
}