Mercurial > hg > monetdb-java

annotate src/main/java/nl/cwi/monetdb/jdbc/MonetSavepoint.java @ 102:08bc9009d190 embedded

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Merged with default
author Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
date Fri, 13 Jan 2017 18:16:30 +0100 (2017-01-13)
parents 6f74e01c57da b9b35ca2eec2
children 5b13ccaba741
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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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b9b35ca2eec2 Updated copyright year to 2017 in *.java files and MonetDriver.java.in and build.xml and version.sh
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2017 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.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)
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46 throw new IllegalArgumentException("Null name not allowed");
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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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55
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56 /**
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57 * Retrieves the generated ID for the savepoint that this Savepoint object represents.
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58 *
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59 * @return the numeric ID of this savepoint
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60 * @throws SQLException if this is a named savepoint
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61 */
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62 @Override
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63 public int getSavepointId() throws SQLException {
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64 if (name != null)
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65 throw new SQLException("Cannot getID for named savepoint", "3B000");
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66 return getId();
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67 }
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68
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69 /**
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70 * Retrieves the name of the savepoint that this Savepoint object represents.
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71 *
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72 * @return the name of this savepoint
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73 * @throws SQLException if this is an un-named savepoint
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74 */
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75 @Override
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76 public String getSavepointName() throws SQLException {
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77 if (name == null)
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78 throw new SQLException("Unable to retrieve name of unnamed savepoint", "3B000");
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79 return name;
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80 }
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81
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82 //== end of methods from Savepoint interface
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83
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84 /**
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85 * Retrieves the savepoint id, like the getSavepointId method with the only difference that this method will always
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86 * return the id, regardless of whether it is named or not.
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87 *
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88 * @return the numeric ID of this savepoint
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89 */
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90 int getId() {
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91 return id;
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92 }
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93
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94 /**
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95 * Returns the name to use when referencing this save point to the MonetDB database. The returned value is
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96 * guaranteed to be unique and consists of a prefix string and a sequence number.
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97 *
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98 * @return the unique savepoint name
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99 */
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100 String getName() {
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101 return "MonetDBSP" + id;
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102 }
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103
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104
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105 /**
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106 * Returns the next id, which is larger than the last returned id. This
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107 * method is synchronized to prevent race conditions. Since this is static
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108 * code, this method is shared by requests from multiple Connection objects.
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109 * Therefore two successive calls to this method need not to have a
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110 * difference of 1.
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111 *
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112 * @return the next int which is guaranteed to be higher than the one at the last call to this method.
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113 */
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114 private static int getNextId() {
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115 return highestId.incrementAndGet();
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116 }
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117
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118 /**
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119 * Returns the highest id returned by getNextId(). This method is also
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120 * synchronized to prevent race conditions and thus guaranteed to be
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121 * thread-safe.
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122 *
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123 * @return the highest id returned by a call to getNextId()
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124 */
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125 private static int getHighestId() {
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126 return highestId.get();
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127 }
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128 }