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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 static com.datastax.driver.core.querybuilder.QueryBuilder.bindMarker;
import static com.datastax.driver.core.querybuilder.QueryBuilder.delete;
import static com.datastax.driver.core.querybuilder.QueryBuilder.eq;
import static com.datastax.driver.core.querybuilder.QueryBuilder.insertInto;
import static com.datastax.driver.core.querybuilder.QueryBuilder.select;
import static org.apache.james.vault.metadata.DeletedMessageMetadataModule.UserPerBucketTable.BUCKET_NAME;
import static org.apache.james.vault.metadata.DeletedMessageMetadataModule.UserPerBucketTable.TABLE;
import static org.apache.james.vault.metadata.DeletedMessageMetadataModule.UserPerBucketTable.USER;

import javax.inject.Inject;

import org.apache.james.backends.cassandra.utils.CassandraAsyncExecutor;
import org.apache.james.blob.api.BucketName;
import org.apache.james.core.Username;

import com.datastax.driver.core.PreparedStatement;
import com.datastax.driver.core.Session;

import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

public class UserPerBucketDAO {
    private final CassandraAsyncExecutor cassandraAsyncExecutor;
    private final PreparedStatement addStatement;
    private final PreparedStatement removeStatement;
    private final PreparedStatement listStatement;
    private final PreparedStatement listBucketsStatement;

    @Inject
    UserPerBucketDAO(Session session) {
        cassandraAsyncExecutor = new CassandraAsyncExecutor(session);
        addStatement = prepareAddUser(session);
        removeStatement = prepareRemoveBucket(session);
        listStatement = prepareListUser(session);
        listBucketsStatement = prepareListBuckets(session);
    }

    private PreparedStatement prepareAddUser(Session session) {
        return session.prepare(insertInto(TABLE)
            .value(BUCKET_NAME, bindMarker(BUCKET_NAME))
            .value(USER, bindMarker(USER)));
    }

    private PreparedStatement prepareRemoveBucket(Session session) {
        return session.prepare(delete().from(TABLE)
            .where(eq(BUCKET_NAME, bindMarker(BUCKET_NAME))));
    }

    private PreparedStatement prepareListUser(Session session) {
        return session.prepare(select(USER).from(TABLE)
            .where(eq(BUCKET_NAME, bindMarker(BUCKET_NAME))));
    }

    private PreparedStatement prepareListBuckets(Session session) {
        return session.prepare(select(BUCKET_NAME).from(TABLE).perPartitionLimit(1));
    }

    Flux retrieveUsers(BucketName bucketName) {
        return cassandraAsyncExecutor.executeRows(listStatement.bind()
            .setString(BUCKET_NAME, bucketName.asString()))
            .map(row -> row.getString(USER))
            .map(Username::of);
    }

    Flux retrieveBuckets() {
        return cassandraAsyncExecutor.executeRows(listBucketsStatement.bind())
            .map(row -> row.getString(BUCKET_NAME))
            .map(BucketName::of);
    }

    Mono addUser(BucketName bucketName, Username username) {
        return cassandraAsyncExecutor.executeVoid(addStatement.bind()
            .setString(BUCKET_NAME, bucketName.asString())
            .setString(USER, username.asString()));
    }

    Mono deleteBucket(BucketName bucketName) {
        return cassandraAsyncExecutor.executeVoid(removeStatement.bind()
            .setString(BUCKET_NAME, bucketName.asString()));
    }
}