Mercurial > hg > monetdb-java

annotate src/main/java/org/monetdb/jdbc/MonetSavepoint.java @ 716:aeb268156580

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Updated Copyright year.
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 05 Jan 2023 12:03:22 +0100 (2023-01-05)
parents 6aa38e8c0f2d
children e890195256ac
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1 /*
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2 * This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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5 *
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2023 MonetDB B.V.
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7 */
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8
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9 package org.monetdb.jdbc;
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11 import java.sql.Savepoint;
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12 import java.sql.SQLException;
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13 import java.util.concurrent.atomic.AtomicInteger;
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14
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15 /**
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16 *<pre>
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17 * A {@link Savepoint} suitable for the MonetDB database.
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18 *
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19 * The representation of a savepoint, which is a point within the current
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20 * transaction that can be referenced from the Connection.rollback() method.
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21 * When a transaction is rolled back to a savepoint all changes made after
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22 * that savepoint are undone.
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23 * Savepoints can be either named or unnamed. Unnamed savepoints are
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24 * identified by an ID generated by the underlying data source.
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25 *
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26 * This little class is nothing more than a container for a name and/or
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27 * an id. Each instance of this class always has an id, which is used for
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28 * internal representation of the save point.
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29 *
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30 * Because the IDs which get generated are a logical sequence, application
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31 * wide, two concurrent transactions are guaranteed to not have the same
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32 * save point identifiers. In this implementation the validity of save points
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33 * is determined by the server, which makes this a light implementation.
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34 *</pre>
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35 *
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36 * @author Fabian Groffen
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37 * @version 1.1
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38 */
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39 public final class MonetSavepoint implements Savepoint {
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40 /** The id of the last created Savepoint */
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41 private static final AtomicInteger highestId = new AtomicInteger(0);
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42
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43 /** The name of this Savepoint */
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44 private final String name;
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45 /** The id of this Savepoint */
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46 private final int id;
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47
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48 /**
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49 * Creates a named MonetSavepoint object
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50 *
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51 * @param name of savepoint
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52 * @throws IllegalArgumentException if no or empty name is given
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53 */
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54 public MonetSavepoint(final String name) throws IllegalArgumentException {
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55 if (name == null || name.isEmpty())
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56 throw new IllegalArgumentException("Missing savepoint name");
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58 this.id = getNextId();
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59 this.name = name;
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60 }
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61
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62 /**
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63 * Creates an unnamed MonetSavepoint object
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64 */
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65 public MonetSavepoint() {
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66 this.id = getNextId();
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67 this.name = null;
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68 }
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70
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71 /**
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72 * Retrieves the generated ID for the savepoint that this Savepoint object
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73 * represents.
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74 *
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75 * @return the numeric ID of this savepoint
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76 * @throws SQLException if this is a named savepoint
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77 */
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78 @Override
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79 public int getSavepointId() throws SQLException {
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80 if (name != null)
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81 throw new SQLException("Cannot get ID of named savepoint", "3B000");
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82
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83 return id;
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84 }
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85
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86 /**
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87 * Retrieves the name of the savepoint that this Savepoint object
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88 * represents.
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89 *
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90 * @return the name of this savepoint
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91 * @throws SQLException if this is an un-named savepoint
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92 */
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93 @Override
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94 public String getSavepointName() throws SQLException {
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95 if (name == null)
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96 throw new SQLException("Cannot get name of un-named savepoint", "3B000");
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97
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98 return name;
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99 }
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100
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101 //== end of methods from Savepoint interface
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102
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103 /**
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104 * Retrieves the savepoint id, like the getSavepointId method with the only
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105 * difference that this method will always return the id, regardless of
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106 * whether it is named or not.
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107 *
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108 * @return the numeric ID of this savepoint
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109 */
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110 final int getId() {
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111 return id;
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112 }
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113
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114 /**
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115 * Returns the constructed internal name to use when referencing this save point to the
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116 * MonetDB database. The returned value is guaranteed to be unique and consists of
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117 * a prefix string and a sequence number.
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118 *
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119 * @return the unique savepoint name
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120 */
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121 final String getName() {
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122 return "JDBCSP" + id;
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123 }
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126 /**
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127 * Returns the next id, which is larger than the last returned id. This
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128 * method is synchronized to prevent race conditions. Since this is static
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129 * code, this method is shared by requests from multiple Connection objects.
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130 * Therefore two successive calls to this method need not to have a
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131 * difference of 1.
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132 *
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133 * @return the next int which is guaranteed to be higher than the one
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134 * at the last call to this method.
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135 */
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136 private static final int getNextId() {
0
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137 return highestId.incrementAndGet();
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138 }
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139
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140 /**
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141 * Returns the highest id returned by getNextId(). This method is also
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142 * synchronized to prevent race conditions and thus guaranteed to be
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143 * thread-safe.
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144 *
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145 * @return the highest id returned by a call to getNextId()
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146 */
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147 // private static int getHighestId() {
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148 // return highestId.get();
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149 // }
0
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150 }