com.speedment.runtime.core.component.transaction.Isolation Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of tool-deploy Show documentation
Show all versions of tool-deploy Show documentation
A Speedment bundle that shades all dependencies into one jar. This is
useful when deploying an application on a server.
The newest version!
/*
*
* Copyright (c) 2006-2019, Speedment, Inc. All Rights Reserved.
*
* 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.speedment.runtime.core.component.transaction;
import java.sql.Connection;
/**
*
* @author Per Minborg
*/
public enum Isolation {
// /**
// * An enum indicating that transactions are not supported.
// */
// NONE(Connection.TRANSACTION_NONE),
/**
* An Enum indicating that the default level of isolation for the
* transaction domain shall be used.
*/
DEFAULT(-1),
/**
* An Enum indicating that dirty reads, non-repeatable reads and phantom
* reads can occur. This level allows a row changed by one transaction to be
* read by another transaction before any changes in that row have been
* committed (a "dirty read"). If any of the changes are rolled back, the
* second transaction will have retrieved an invalid row.
*/
READ_UNCOMMITTED(Connection.TRANSACTION_READ_UNCOMMITTED),
/**
* An Enum indicating that dirty reads are prevented; non-repeatable reads
* and phantom reads can occur. This level only prohibits a transaction from
* reading a row with uncommitted changes in it.
*/
READ_COMMITTED(Connection.TRANSACTION_READ_COMMITTED),
/**
* An Enum indicating that dirty reads and non-repeatable reads are
* prevented; phantom reads can occur. This level prohibits a transaction
* from reading a row with uncommitted changes in it, and it also prohibits
* the situation where one transaction reads a row, a second transaction
* alters the row, and the first transaction rereads the row, getting
* different values the second time (a "non-repeatable read").
*/
REPEATABLE_READ(Connection.TRANSACTION_REPEATABLE_READ),
/**
* An Enum indicating that dirty reads, non-repeatable reads and phantom
* reads are prevented. This level includes the prohibitions in
* TRANSACTION_REPEATABLE_READ
and further prohibits the
* situation where one transaction reads all rows that satisfy a
* WHERE
condition, a second transaction inserts a row that
* satisfies that WHERE
condition, and the first transaction
* rereads for the same condition, retrieving the additional "phantom" row
* in the second read.
*/
SERIALIZABLE(Connection.TRANSACTION_SERIALIZABLE);
private final int sqlIsolationLevel;
private Isolation(int sqlIsolationlevel) {
this.sqlIsolationLevel = sqlIsolationlevel;
}
public int getSqlIsolationLevel() {
if (DEFAULT == this) {
throw new IllegalArgumentException("The DEFAULT isolation level does not have a hard coded value.");
}
return sqlIsolationLevel;
}
public static Isolation fromSqlIsolationLevel(int level) {
switch (level) {
case Connection.TRANSACTION_READ_UNCOMMITTED: {
return READ_UNCOMMITTED;
}
case Connection.TRANSACTION_READ_COMMITTED: {
return READ_COMMITTED;
}
case Connection.TRANSACTION_REPEATABLE_READ: {
return REPEATABLE_READ;
}
case Connection.TRANSACTION_SERIALIZABLE: {
return SERIALIZABLE;
}
default:
throw new IllegalArgumentException("No Isolation exists for " + level);
}
}
}