co.cask.hydrator.plugin.db.batch.TransactionIsolationLevel Maven / Gradle / Ivy
/*
* Copyright © 2018 Cask Data, 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 co.cask.hydrator.plugin.db.batch;
import java.sql.Connection;
import java.util.Arrays;
import javax.annotation.Nullable;
/**
* Utility class for dealing with {@link Connection}'s transaction isolation level constants. This class
* is needed primarily because the Connection class uses int constants, instead of Enums.
*/
public final class TransactionIsolationLevel {
public static final String CONF_KEY = "co.cask.hydrator.db.plugin.transaction.isolation.level";
private TransactionIsolationLevel() {
}
/**
* Enum mapping to the constants in {@link Connection}.
*/
public enum Level {
TRANSACTION_NONE(0),
TRANSACTION_READ_UNCOMMITTED(1),
TRANSACTION_READ_COMMITTED(2),
TRANSACTION_REPEATABLE_READ(4),
TRANSACTION_SERIALIZABLE(8);
private final int level;
Level(int level) {
this.level = level;
}
}
/**
* Translates a transaction isolation level string to the corresponding int constant.
* For instance, if given "TRANSACTION_NONE", will return 0, as that is the
* value of {@link Connection#TRANSACTION_NONE}. Defaults to {@link Connection#TRANSACTION_SERIALIZABLE}
* if the given input is {@code null}.
*
* @param level String version of the level.
* @return int corresponding to the constant in {@link Connection} for the level.
*/
public static int getLevel(@Nullable String level) {
if (level == null) {
return Connection.TRANSACTION_SERIALIZABLE;
}
return Level.valueOf(level.toUpperCase()).level;
}
/**
* Validates that the given level is either null or one of the possible transaction isolation levels.
*
* @param level the level to check
*/
public static void validate(@Nullable String level) {
if (level == null) {
return;
}
try {
Level.valueOf(level.toUpperCase());
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException(String.format(
"Transaction isolation level must be one of the following values: %s, but got: %s.",
Arrays.toString(Level.values()), level));
}
}
}