ConfigParameterTypes.java

package edu.berkeley.thebes.common.config;

/**
 * Special type interface between the config YAML and Java.
 * If a ConfigParameter requires a ConfigParameterType, you should use the lowercase
 * value (e.g., "twopl" to set TWOPL for TransactionMode).
 */
public interface ConfigParameterTypes {
    public enum PersistenceEngine implements ConfigParameterTypes {
        MEMORY,
        LEVELDB,
        BDB;
    }
    
    public enum TransactionMode implements ConfigParameterTypes {
        HAT (ConfigParameters.CLUSTER_CONFIG),
        TWOPL (ConfigParameters.TWOPL_CLUSTER_CONFIG);
        
        private final ConfigParameters clusterConfigParam;

        private TransactionMode(ConfigParameters clusterConfigParam) {
            this.clusterConfigParam = clusterConfigParam;
        }

        public ConfigParameters getClusterConfigParam() {
            return clusterConfigParam;
        }
    }

    public enum IsolationLevel implements ConfigParameterTypes {
        NO_ISOLATION(0),
        READ_COMMITTED(1),
        REPEATABLE_READ(2);
        
        private int strictness;

        private IsolationLevel(int strictness) {
            this.strictness = strictness;
        }
        
        public boolean atOrHigher(IsolationLevel level) {
            return this.strictness >= level.strictness;
        }
        
        public boolean higherThan(IsolationLevel level) {
            return this.strictness > level.strictness;
        }
    }

    /*
        no session guarantees for now!
    */
    public enum SessionLevel implements ConfigParameterTypes {
        NO_SESSION
    }

    /*
      TODO: switch between client-level and transaction level
      currently just client-level
     */
    public enum AtomicityLevel implements ConfigParameterTypes {
        NO_ATOMICITY,
        CLIENT;
    }
    
    public enum RoutingMode implements ConfigParameterTypes {
        MASTERED,
        QUORUM,
        NEAREST;
    }
}