src/main/java/io/mifos/core/cassandra/core/TenantAwareEntityTemplate.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package io.mifos.core.cassandra.core;

import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.Statement;
import com.datastax.driver.mapping.Mapper;

import javax.annotation.Nonnull;
import java.util.List;
import java.util.Optional;

public class TenantAwareEntityTemplate {

  private final CassandraSessionProvider cassandraSessionProvider;
  private final TenantAwareCassandraMapperProvider tenantAwareCassandraMapperProvider;

  public TenantAwareEntityTemplate(final CassandraSessionProvider cassandraSessionProvider,
                                   final TenantAwareCassandraMapperProvider tenantAwareCassandraMapperProvider) {
    super();
    this.cassandraSessionProvider = cassandraSessionProvider;
    this.tenantAwareCassandraMapperProvider = tenantAwareCassandraMapperProvider;
  }

  @SuppressWarnings("unchecked")
  public <T> void save(final T entity) {
    final Mapper<T> mapper = this.tenantAwareCassandraMapperProvider.getMapper((Class<T>) entity.getClass());
    mapper.save(entity);
  }

  @Nonnull
  public <T> Optional<T> findById(final Class<T> type, final Object... identifier) {
    final Mapper<T> mapper = this.tenantAwareCassandraMapperProvider.getMapper(type);
    return Optional.ofNullable(mapper.get(identifier));
  }


  @Nonnull
  public <T> List<T> fetchByKeys(final Class<T> type, final Object... keys) {
    final Mapper<T> mapper = this.tenantAwareCassandraMapperProvider.getMapper(type);
    final Statement query = mapper.getQuery(keys);
    final ResultSet resultSet = this.cassandraSessionProvider.getTenantSession().execute(query);
    return mapper.map(resultSet).all();
  }

  @SuppressWarnings("unchecked")
  public <T> void delete(final T entity) {
    final Mapper<T> mapper = this.tenantAwareCassandraMapperProvider.getMapper((Class<T>) entity.getClass());
    mapper.delete(entity);
  }
}