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Apache James Mailbox Deleted Messages Vault metadata on top of Cassandra
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package org.apache.james.vault.metadata;

import javax.inject.Inject;

import org.apache.james.blob.api.BucketName;
import org.apache.james.core.Username;
import org.apache.james.mailbox.model.MessageId;
import org.reactivestreams.Publisher;

public class CassandraDeletedMessageMetadataVault implements DeletedMessageMetadataVault {
    private final MetadataDAO metadataDAO;
    private final StorageInformationDAO storageInformationDAO;
    private final UserPerBucketDAO userPerBucketDAO;

    @Inject
    CassandraDeletedMessageMetadataVault(MetadataDAO metadataDAO, StorageInformationDAO storageInformationDAO, UserPerBucketDAO userPerBucketDAO) {
        this.metadataDAO = metadataDAO;
        this.storageInformationDAO = storageInformationDAO;
        this.userPerBucketDAO = userPerBucketDAO;
    }

    @Override
    public Publisher store(DeletedMessageWithStorageInformation deletedMessage) {
        BucketName bucketName = deletedMessage.getStorageInformation().getBucketName();
        Username owner = deletedMessage.getDeletedMessage().getOwner();
        MessageId messageId = deletedMessage.getDeletedMessage().getMessageId();
        return storageInformationDAO.referenceStorageInformation(owner, messageId, deletedMessage.getStorageInformation())
            .then(metadataDAO.store(deletedMessage))
            .then(userPerBucketDAO.addUser(bucketName, owner));
    }

    @Override
    public Publisher removeMetadataRelatedToBucket(BucketName bucketName) {
        return userPerBucketDAO.retrieveUsers(bucketName)
            .concatMap(user -> metadataDAO.retrieveMessageIds(bucketName, user)
                .map(messageId -> new DeletedMessageIdentifier(user, messageId))
                .concatMap(deletedMessageIdentifier -> storageInformationDAO.deleteStorageInformation(
                    deletedMessageIdentifier.getOwner(),
                    deletedMessageIdentifier.getMessageId()))
                .then(metadataDAO.deleteInBucket(bucketName, user)))
            .then(userPerBucketDAO.deleteBucket(bucketName));
    }

    @Override
    public Publisher remove(BucketName bucketName, Username username, MessageId messageId) {
        return storageInformationDAO.deleteStorageInformation(username, messageId)
            .then(metadataDAO.deleteMessage(bucketName, username, messageId));
    }

    @Override
    public Publisher retrieveStorageInformation(Username username, MessageId messageId) {
        return storageInformationDAO.retrieveStorageInformation(username, messageId);
    }

    @Override
    public Publisher listMessages(BucketName bucketName, Username username) {
        return metadataDAO.retrieveMetadata(bucketName, username);
    }

    @Override
    public Publisher listRelatedBuckets() {
        return userPerBucketDAO.retrieveBuckets();
    }
}