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annotate src/main/java/nl/cwi/monetdb/jdbc/MonetSavepoint.java @ 296:c5efd6e661e5

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Add "final" keyword to classes, method arguments and local variables where possible.` Improved error messages in MonetSavepoint. Removed two not needed updateNCharacterStream() methods from MonetResultSet.
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Wed, 07 Aug 2019 21:12:22 +0200 (2019-08-07)
parents 003ae6d881db
children bb273e9c7e09
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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 - 2019 MonetDB B.V.
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7 */
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8
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9 package nl.cwi.monetdb.jdbc;
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10
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e092fa8d9ab7 Expand import java.*.* statements
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11 import java.sql.SQLException;
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12 import java.util.concurrent.atomic.AtomicInteger;
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13
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14 /**
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15 * The representation of a savepoint, which is a point within the current
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16 * transaction that can be referenced from the Connection.rollback method.
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17 * When a transaction is rolled back to a savepoint all changes made after
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18 * that savepoint are undone.
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19 * Savepoints can be either named or unnamed. Unnamed savepoints are
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20 * identified by an ID generated by the underlying data source.
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21 *
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22 * This little class is nothing more than a container for a name and/or
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23 * an id. Each instance of this class always has an id, which is used for
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24 * internal representation of the save point.
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25 *
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26 * Because the IDs which get generated are a logical sequence, application
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27 * wide, two concurrent transactions are guaranteed to not to have the same
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28 * save point identifiers. In this implementation the validity of save points
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29 * is determined by the server, which makes this a light implementation.
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30 *
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31 * @author Fabian Groffen
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32 * @version 1.1
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33 */
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34 public final class MonetSavepoint implements java.sql.Savepoint {
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35 /** The id of the last created Savepoint */
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36 private static final AtomicInteger highestId = new AtomicInteger(0);
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37
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38 /** The name of this Savepoint */
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39 private final String name;
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40 /** The id of this Savepoint */
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41 private final int id;
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42
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43 /**
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44 * Creates a named MonetSavepoint object
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45 */
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46 public MonetSavepoint(final String name) throws IllegalArgumentException {
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47 if (name == null || name.isEmpty())
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48 throw new IllegalArgumentException("Missing savepoint name");
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50 this.id = getNextId();
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51 this.name = name;
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52 }
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54 /**
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55 * Creates an unnamed MonetSavepoint object
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56 */
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57 public MonetSavepoint() {
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58 this.id = getNextId();
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59 this.name = null;
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60 }
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62
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63 /**
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64 * Retrieves the generated ID for the savepoint that this Savepoint object
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65 * represents.
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66 *
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67 * @return the numeric ID of this savepoint
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68 * @throws SQLException if this is a named savepoint
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69 */
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70 @Override
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71 public int getSavepointId() throws SQLException {
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72 if (name != null)
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73 throw new SQLException("Cannot get ID of named savepoint", "3B000");
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74
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75 return id;
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76 }
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77
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78 /**
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79 * Retrieves the name of the savepoint that this Savepoint object
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80 * represents.
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81 *
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82 * @return the name of this savepoint
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83 * @throws SQLException if this is an un-named savepoint
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84 */
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85 @Override
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86 public String getSavepointName() throws SQLException {
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87 if (name == null)
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88 throw new SQLException("Cannot get name of un-named savepoint", "3B000");
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89
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90 return name;
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91 }
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92
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93 //== end of methods from Savepoint interface
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94
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95 /**
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96 * Retrieves the savepoint id, like the getSavepointId method with the only
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97 * difference that this method will always return the id, regardless of
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98 * whether it is named or not.
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99 *
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100 * @return the numeric ID of this savepoint
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101 */
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102 final int getId() {
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103 return id;
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104 }
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105
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106 /**
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107 * Returns the constructed internal name to use when referencing this save point to the
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108 * MonetDB database. The returned value is guaranteed to be unique and consists of
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109 * a prefix string and a sequence number.
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110 *
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111 * @return the unique savepoint name
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112 */
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113 final String getName() {
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114 return "JDBCSP" + id;
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115 }
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117
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118 /**
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119 * Returns the next id, which is larger than the last returned id. This
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120 * method is synchronized to prevent race conditions. Since this is static
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121 * code, this method is shared by requests from multiple Connection objects.
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122 * Therefore two successive calls to this method need not to have a
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123 * difference of 1.
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124 *
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125 * @return the next int which is guaranteed to be higher than the one
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126 * at the last call to this method.
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127 */
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128 private static final int getNextId() {
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129 return highestId.incrementAndGet();
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130 }
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131
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132 /**
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133 * Returns the highest id returned by getNextId(). This method is also
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134 * synchronized to prevent race conditions and thus guaranteed to be
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135 * thread-safe.
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136 *
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137 * @return the highest id returned by a call to getNextId()
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138 */
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139 // private static int getHighestId() {
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140 // return highestId.get();
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141 // }
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142 }