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Copy of MonetDB java directory changeset e6e32756ad31.
author Sjoerd Mullender <sjoerd@acm.org>
date Wed, 21 Sep 2016 09:34:48 +0200 (2016-09-21)
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children 7307caacc2d5 e092fa8d9ab7
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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 - 2016 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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11 import java.sql.*;
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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 validaty 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 1.0
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33 */
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34 public class MonetSavepoint implements Savepoint {
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35 /** The id of the last created Savepoint */
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36 private static 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 public MonetSavepoint(String name) throws IllegalArgumentException {
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44 if (name == null) throw new IllegalArgumentException("null not allowed");
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45
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46 this.id = getNextId();
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47 this.name = name;
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48 }
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49
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50 public MonetSavepoint() {
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51 this.id = getNextId();
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52 this.name = null;
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53 }
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54
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55
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56 /**
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57 * Retrieves the generated ID for the savepoint that this Savepoint object
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58 * represents.
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59 *
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60 * @return the numeric ID of this savepoint
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61 * @throws SQLException if this is a named savepoint
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62 */
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63 @Override
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64 public int getSavepointId() throws SQLException {
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65 if (name != null) throw
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66 new SQLException("Cannot getID for named savepoint", "3B000");
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67
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68 return getId();
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69 }
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70
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71 /**
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72 * Retrieves the name of the savepoint that this Savepoint object
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73 * represents.
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74 *
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75 * @return the name of this savepoint
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76 * @throws SQLException if this is an un-named savepoint
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77 */
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78 @Override
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79 public String getSavepointName() throws SQLException {
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80 if (name == null) throw
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81 new SQLException("Unable to retrieve name of unnamed savepoint", "3B000");
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82
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83 return name;
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84 }
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85
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86 //== end of methods from Savepoint interface
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87
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88 /**
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89 * Retrieves the savepoint id, like the getSavepointId method with the only
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90 * difference that this method will always return the id, regardless of
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91 * whether it is named or not.
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92 *
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93 * @return the numeric ID of this savepoint
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94 */
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95 int getId() {
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96 return id;
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97 }
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98
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99 /**
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100 * Returns the name to use when referencing this save point to the MonetDB
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101 * database. The returned value is guaranteed to be unique and consists of
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102 * a prefix string and a sequence number.
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103 *
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104 * @return the unique savepoint name
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105 */
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106 String getName() {
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107 return "MonetDBSP" + id;
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108 }
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109
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110
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111 /**
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112 * Returns the next id, which is larger than the last returned id. This
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113 * method is synchronized to prevent race conditions. Since this is static
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114 * code, this method is shared by requests from multiple Connection objects.
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115 * Therefore two successive calls to this method need not to have a
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116 * difference of 1.
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117 *
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118 * @return the next int which is guaranteed to be higher than the one
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119 * at the last call to this method.
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120 */
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121 private static int getNextId() {
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122 return highestId.incrementAndGet();
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123 }
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124
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125 /**
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126 * Returns the highest id returned by getNextId(). This method is also
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127 * synchronized to prevent race conditions and thus guaranteed to be
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128 * thread-safe.
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129 *
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130 * @return the highest id returned by a call to getNextId()
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131 */
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132 private static int getHighestId() {
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133 return highestId.get();
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134 }
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135 }