src/main/java/io/mifos/core/cassandra/core/OptionProvider.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.ConsistencyLevel;
import com.datastax.driver.mapping.Mapper;
import io.mifos.core.cassandra.util.CassandraConnectorConstants;
import org.springframework.core.env.Environment;
import org.springframework.util.Assert;

import javax.annotation.Nonnull;
import java.util.HashMap;

@SuppressWarnings("WeakerAccess")
public final class OptionProvider {

  private static final HashMap<String, Mapper.Option> CACHED_OPTIONS = new HashMap<>();

  private OptionProvider() {
    super();
  }

  @Nonnull
  public static Mapper.Option deleteConsistencyLevel(@Nonnull final Environment env) {
    Assert.notNull(env, "An environment must be given!");
    if (OptionProvider.CACHED_OPTIONS.isEmpty()) {
      OptionProvider.lazyOptionInit(env);
    }
    return OptionProvider.CACHED_OPTIONS.get(CassandraConnectorConstants.CONSISTENCY_LEVEL_DELETE_PROP);
  }

  @Nonnull
  public static Mapper.Option readConsistencyLevel(@Nonnull final Environment env) {
    Assert.notNull(env, "An environment must be given!");
    if (OptionProvider.CACHED_OPTIONS.isEmpty()) {
      OptionProvider.lazyOptionInit(env);
    }
    return OptionProvider.CACHED_OPTIONS.get(CassandraConnectorConstants.CONSISTENCY_LEVEL_READ_PROP);
  }

  @Nonnull
  public static Mapper.Option writeConsistencyLevel(@Nonnull final Environment env) {
    Assert.notNull(env, "An environment must be given!");
    if (OptionProvider.CACHED_OPTIONS.isEmpty()) {
      OptionProvider.lazyOptionInit(env);
    }
    return OptionProvider.CACHED_OPTIONS.get(CassandraConnectorConstants.CONSISTENCY_LEVEL_WRITE_PROP);
  }

  private static void lazyOptionInit(final Environment env) {
    OptionProvider.CACHED_OPTIONS.put(CassandraConnectorConstants.CONSISTENCY_LEVEL_DELETE_PROP,
        Mapper.Option.consistencyLevel(
            ConsistencyLevel.valueOf(
                env.getProperty(CassandraConnectorConstants.CONSISTENCY_LEVEL_DELETE_PROP,
                    CassandraConnectorConstants.CONSISTENCY_LEVEL_PROP_DEFAULT))));

    OptionProvider.CACHED_OPTIONS.put(CassandraConnectorConstants.CONSISTENCY_LEVEL_READ_PROP,
        Mapper.Option.consistencyLevel(
            ConsistencyLevel.valueOf(
                env.getProperty(CassandraConnectorConstants.CONSISTENCY_LEVEL_READ_PROP,
                    CassandraConnectorConstants.CONSISTENCY_LEVEL_PROP_DEFAULT))));

    OptionProvider.CACHED_OPTIONS.put(CassandraConnectorConstants.CONSISTENCY_LEVEL_WRITE_PROP,
        Mapper.Option.consistencyLevel(
            ConsistencyLevel.valueOf(
                env.getProperty(CassandraConnectorConstants.CONSISTENCY_LEVEL_WRITE_PROP,
                    CassandraConnectorConstants.CONSISTENCY_LEVEL_PROP_DEFAULT))));
  }
}