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annotate flys-aft/src/main/java/de/intevation/db/ConnectedStatements.java @ 4421:0b0f415203f0

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Add new Filter class to change caching Add new Filter class to avoid caching of GWT nocache files in browsers and http proxies. The new Filter class NoCacheFilter sets http headers to stop the proxies and browesers from storing the nocache files.
author Björn Ricks <bjoern.ricks@intevation.de>
date Tue, 06 Nov 2012 13:32:06 +0100
parents aad1886ea226
children b195fede1c3b
rev   line source
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1 package de.intevation.db;
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2
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3 import java.util.HashMap;
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4 import java.util.Map;
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5 import java.util.Deque;
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6 import java.util.ArrayDeque;
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7
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8 import java.sql.Connection;
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9 import java.sql.SQLException;
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10 import java.sql.Savepoint;
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11 import java.sql.DatabaseMetaData;
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12
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13 import org.apache.log4j.Logger;
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14
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15 public class ConnectedStatements
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16 {
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17 private static Logger log = Logger.getLogger(ConnectedStatements.class);
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18
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19 protected Connection connection;
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20
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21 protected Map<String, SymbolicStatement> statements;
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22
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23 protected Map<String, SymbolicStatement.Instance> boundStatements;
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24
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25 protected Deque<Savepoint> savepoints;
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26
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27 public ConnectedStatements(
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28 Connection connection,
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29 Map<String, SymbolicStatement> statements
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30 )
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31 throws SQLException
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32 {
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33 this.connection = connection;
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34 this.statements = statements;
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35 checkSavePoints();
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36
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37 boundStatements = new HashMap<String, SymbolicStatement.Instance>();
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38 }
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39
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40 protected void checkSavePoints() throws SQLException {
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41 DatabaseMetaData metaData = connection.getMetaData();
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42 if (metaData.supportsSavepoints()) {
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43 log.info("Driver '" + metaData.getDriverName() +
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44 "' does support savepoints.");
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45 savepoints = new ArrayDeque<Savepoint>();
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46 }
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47 else {
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48 log.info("Driver '" + metaData.getDriverName() +
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49 "' does not support savepoints.");
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50 }
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51 }
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52
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53 public SymbolicStatement.Instance getStatement(String key)
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54 throws SQLException
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55 {
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56 SymbolicStatement.Instance stmnt = boundStatements.get(key);
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57 if (stmnt != null) {
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58 return stmnt;
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59 }
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60
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61 SymbolicStatement ss = statements.get(key);
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62 if (ss == null) {
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63 return null;
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64 }
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65
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66 stmnt = ss.new Instance(connection);
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67 boundStatements.put(key, stmnt);
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68 return stmnt;
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69 }
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70
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71 public void beginTransaction() throws SQLException {
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72 if (savepoints != null) {
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73 savepoints.push(connection.setSavepoint());
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74 }
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75 }
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76
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77 public void commitTransaction() throws SQLException {
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78 if (savepoints != null) {
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79 savepoints.pop();
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80 }
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81 connection.commit();
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82 }
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83
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84 public void rollbackTransaction() throws SQLException {
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85 if (savepoints != null) {
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86 Savepoint savepoint = savepoints.pop();
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87 connection.rollback(savepoint);
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88 }
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89 else {
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90 connection.rollback();
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91 }
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92 }
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93
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94 public void close() {
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95 for (SymbolicStatement.Instance s: boundStatements.values()) {
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96 s.close();
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97 }
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98
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99 try {
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100 if (savepoints != null && !savepoints.isEmpty()) {
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101 Savepoint savepoint = savepoints.peekFirst();
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102 connection.rollback(savepoint);
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103 }
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104 connection.close();
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105 }
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106 catch (SQLException sqle) {
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107 }
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108 }
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109 }
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110 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org