com.jpattern.orm.transaction.TransactionIsolation Maven / Gradle / Ivy
package com.jpattern.orm.transaction;
import java.sql.Connection;
/**
*
* @author Francesco Cina
*
* 13/giu/2011
*/
public enum TransactionIsolation {
/**
* Use the default isolation level of the underlying datastore.
*/
DEFAULT(-1),
/**
* Indicates that dirty reads, non-repeatable reads and phantom reads
* are prevented.
* This level includes the prohibitions in {@link #ISOLATION_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
* re-reads for the same condition, retrieving the additional "phantom" row
* in the second read.
* @see java.sql.Connection#TRANSACTION_SERIALIZABLE
*/
SERIALIZABLE(Connection.TRANSACTION_SERIALIZABLE),
/**
* Indicates 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 re-reads the row,
* getting different values the second time (a "non-repeatable read").
* @see java.sql.Connection#TRANSACTION_REPEATABLE_READ
*/
REPEATABLE_READS(Connection.TRANSACTION_REPEATABLE_READ),
/**
* Indicates 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.
* @see java.sql.Connection#TRANSACTION_READ_COMMITTED
*/
READ_COMMITTED(Connection.TRANSACTION_READ_COMMITTED),
/**
* Indicates 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.
* @see java.sql.Connection#TRANSACTION_READ_UNCOMMITTED
*/
READ_UNCOMMITTED(Connection.TRANSACTION_READ_UNCOMMITTED);
private int isolationLevel;
private TransactionIsolation(int isolationLevel) {
this.isolationLevel = isolationLevel;
}
public int getTransactionIsolation() {
return isolationLevel;
}
}