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A driver for Scylla and Apache Cassandra 1.2+ that works exclusively with the Cassandra Query Language version 3 (CQL3) and Cassandra's binary protocol.

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/*
 * Copyright DataStax, Inc.
 *
 * Licensed 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 com.datastax.driver.core;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Allows overriding internal settings via system properties.
 *
 * This is generally reserved for tests or "expert" usage.
 */
class SystemProperties {
  private static final Logger logger = LoggerFactory.getLogger(SystemProperties.class);

  static int getInt(String key, int defaultValue) {
    String stringValue = System.getProperty(key);
    if (stringValue == null) {
      logger.debug("{} is undefined, using default value {}", key, defaultValue);
      return defaultValue;
    }
    try {
      int value = Integer.parseInt(stringValue);
      logger.info("{} is defined, using value {}", key, value);
      return value;
    } catch (NumberFormatException e) {
      logger.warn(
          "{} is defined but could not parse value {}, using default value {}",
          key,
          stringValue,
          defaultValue);
      return defaultValue;
    }
  }

  static boolean getBoolean(String key, boolean defaultValue) {
    String stringValue = System.getProperty(key);
    if (stringValue == null) {
      logger.debug("{} is undefined, using default value {}", key, defaultValue);
      return defaultValue;
    }
    try {
      boolean value = Boolean.parseBoolean(stringValue);
      logger.info("{} is defined, using value {}", key, value);
      return value;
    } catch (NumberFormatException e) {
      logger.warn(
          "{} is defined but could not parse value {}, using default value {}",
          key,
          stringValue,
          defaultValue);
      return defaultValue;
    }
  }
}