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annotate src/main/java/nl/cwi/monetdb/jdbc/MonetSavepoint.java @ 69:e092fa8d9ab7

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Expand import java.*.* statements
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 08 Dec 2016 14:39:59 +0100 (2016-12-08)
parents a5a898f6886c
children b9b35ca2eec2
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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.SQLException;
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12 import java.sql.Savepoint;
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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 * The representation of a savepoint, which is a point within the current
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17 * transaction that can be referenced from the Connection.rollback method.
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18 * When a transaction is rolled back to a savepoint all changes made after
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19 * that savepoint are undone.
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20 * Savepoints can be either named or unnamed. Unnamed savepoints are
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21 * identified by an ID generated by the underlying data source.
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22 *
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23 * This little class is nothing more than a container for a name and/or
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24 * an id. Each instance of this class always has an id, which is used for
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25 * internal representation of the save point.
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26 *
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27 * Because the IDs which get generated are a logical sequence, application
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28 * wide, two concurrent transactions are guaranteed to not to have the same
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29 * save point identifiers. In this implementation the validaty of save points
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30 * is determined by the server, which makes this a light implementation.
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31 *
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32 * @author Fabian Groffen
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33 * @version 1.0
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34 */
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35 public class MonetSavepoint implements Savepoint {
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36 /** The id of the last created Savepoint */
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37 private static AtomicInteger highestId = new AtomicInteger(0);
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38
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39 /** The name of this Savepoint */
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40 private final String name;
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41 /** The id of this Savepoint */
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42 private final int id;
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43
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44 public MonetSavepoint(String name) throws IllegalArgumentException {
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45 if (name == null) throw new IllegalArgumentException("null not allowed");
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46
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47 this.id = getNextId();
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48 this.name = name;
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49 }
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50
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51 public MonetSavepoint() {
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52 this.id = getNextId();
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53 this.name = null;
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54 }
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56
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57 /**
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58 * Retrieves the generated ID for the savepoint that this Savepoint object
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59 * represents.
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60 *
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61 * @return the numeric ID of this savepoint
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62 * @throws SQLException if this is a named savepoint
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63 */
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64 @Override
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65 public int getSavepointId() throws SQLException {
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66 if (name != null) throw
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67 new SQLException("Cannot getID for named savepoint", "3B000");
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68
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69 return getId();
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70 }
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71
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72 /**
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73 * Retrieves the name of the savepoint that this Savepoint object
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74 * represents.
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75 *
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76 * @return the name of this savepoint
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77 * @throws SQLException if this is an un-named savepoint
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78 */
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79 @Override
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80 public String getSavepointName() throws SQLException {
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81 if (name == null) throw
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82 new SQLException("Unable to retrieve name of unnamed savepoint", "3B000");
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83
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84 return name;
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85 }
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86
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87 //== end of methods from Savepoint interface
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88
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89 /**
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90 * Retrieves the savepoint id, like the getSavepointId method with the only
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91 * difference that this method will always return the id, regardless of
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92 * whether it is named or not.
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93 *
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94 * @return the numeric ID of this savepoint
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95 */
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96 int getId() {
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97 return id;
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98 }
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99
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100 /**
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101 * Returns the name to use when referencing this save point to the MonetDB
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102 * database. The returned value is guaranteed to be unique and consists of
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103 * a prefix string and a sequence number.
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104 *
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105 * @return the unique savepoint name
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106 */
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107 String getName() {
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108 return "MonetDBSP" + id;
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109 }
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110
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111
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112 /**
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113 * Returns the next id, which is larger than the last returned id. This
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114 * method is synchronized to prevent race conditions. Since this is static
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115 * code, this method is shared by requests from multiple Connection objects.
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116 * Therefore two successive calls to this method need not to have a
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117 * difference of 1.
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118 *
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119 * @return the next int which is guaranteed to be higher than the one
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120 * at the last call to this method.
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121 */
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122 private static int getNextId() {
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123 return highestId.incrementAndGet();
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124 }
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125
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126 /**
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127 * Returns the highest id returned by getNextId(). This method is also
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128 * synchronized to prevent race conditions and thus guaranteed to be
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129 * thread-safe.
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130 *
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131 * @return the highest id returned by a call to getNextId()
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132 */
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133 private static int getHighestId() {
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134 return highestId.get();
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135 }
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136 }