Source Code Cross Referenced for Isolation.java in  » J2EE » spring-framework-2.0.6 » org » springframework » transaction » annotation » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.transaction.annotation 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 2002-2005 the original author or authors.
03:         *
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         *
08:         *      http://www.apache.org/licenses/LICENSE-2.0
09:         *
10:         * Unless required by applicable law or agreed to in writing, software
11:         * distributed under the License is distributed on an "AS IS" BASIS,
12:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13:         * See the License for the specific language governing permissions and
14:         * limitations under the License.
15:         */
16:
17:        package org.springframework.transaction.annotation;
18:
19:        import org.springframework.transaction.TransactionDefinition;
20:
21:        /**
22:         * Enumeration that represents transaction isolation levels
23:         * for use with the JDK 1.5+ transaction annotation, corresponding
24:         * to the TransactionDefinition interface.
25:         *
26:         * @author Colin Sampaleanu
27:         * @author Juergen Hoeller
28:         * @since 1.2
29:         * @see org.springframework.transaction.annotation.Transactional
30:         * @see org.springframework.transaction.TransactionDefinition
31:         */
32:        public enum Isolation {
33:
34:            /**
35:             * Use the default isolation level of the underlying datastore.
36:             * All other levels correspond to the JDBC isolation levels.
37:             * @see java.sql.Connection
38:             */
39:            DEFAULT(TransactionDefinition.ISOLATION_DEFAULT),
40:
41:            /**
42:             * A constant indicating that dirty reads, non-repeatable reads and phantom reads
43:             * can occur. This level allows a row changed by one transaction to be read by
44:             * another transaction before any changes in that row have been committed
45:             * (a "dirty read"). If any of the changes are rolled back, the second
46:             * transaction will have retrieved an invalid row.
47:             * @see java.sql.Connection#TRANSACTION_READ_UNCOMMITTED
48:             */
49:            READ_UNCOMMITTED(TransactionDefinition.ISOLATION_READ_UNCOMMITTED),
50:
51:            /**
52:             * A constant indicating that dirty reads are prevented; non-repeatable reads
53:             * and phantom reads can occur. This level only prohibits a transaction
54:             * from reading a row with uncommitted changes in it.
55:             * @see java.sql.Connection#TRANSACTION_READ_COMMITTED
56:             */
57:            READ_COMMITTED(TransactionDefinition.ISOLATION_READ_COMMITTED),
58:
59:            /**
60:             * A constant indicating that dirty reads and non-repeatable reads are
61:             * prevented; phantom reads can occur. This level prohibits a transaction
62:             * from reading a row with uncommitted changes in it, and it also prohibits
63:             * the situation where one transaction reads a row, a second transaction
64:             * alters the row, and the first transaction rereads the row, getting
65:             * different values the second time (a "non-repeatable read").
66:             * @see java.sql.Connection#TRANSACTION_REPEATABLE_READ
67:             */
68:            REPEATABLE_READ(TransactionDefinition.ISOLATION_REPEATABLE_READ),
69:
70:            /**
71:             * A constant indicating that dirty reads, non-repeatable reads and phantom
72:             * reads are prevented. This level includes the prohibitions in
73:             * <code>ISOLATION_REPEATABLE_READ</code> and further prohibits the situation
74:             * where one transaction reads all rows that satisfy a <code>WHERE</code>
75:             * condition, a second transaction inserts a row that satisfies that
76:             * <code>WHERE</code> condition, and the first transaction rereads for the
77:             * same condition, retrieving the additional "phantom" row in the second read.
78:             * @see java.sql.Connection#TRANSACTION_SERIALIZABLE
79:             */
80:            SERIALIZABLE(TransactionDefinition.ISOLATION_SERIALIZABLE);
81:
82:            private final int value;
83:
84:            Isolation(int value) {
85:                this .value = value;
86:            }
87:
88:            public int value() {
89:                return value;
90:            }
91:
92:        }
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