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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/datacage/templating/CompiledStatement.java @ 5779:ebec12def170

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Datacage: Add a pool of builders to make it multi threadable. XML DOM is not thread safe. Therefore the old implementation only allowed one thread to use the builder at a time. As the complexity of the configuration has increased over time this has become a bottleneck of the whole application because it took quiet some time to build a result. Furthermore the builder code path is visited very frequent. So many concurrent requests were piled up resulting in long waits for the users. To mitigate this problem a round robin pool of builders is used now. Each of the pooled builders has an independent copy of the XML template and can be run in parallel. The number of builders is determined by the system property 'flys.datacage.pool.size'. It defaults to 4.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 21 Apr 2013 12:48:09 +0200
parents ad9f1bdd51ba
children
rev   line source
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1 package de.intevation.flys.artifacts.datacage.templating;
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2
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3 import java.util.regex.Pattern;
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4 import java.util.regex.Matcher;
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5
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6 import java.util.List;
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7 import java.util.Map;
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8 import java.util.TreeMap;
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9 import java.util.ArrayList;
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10
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11 import java.sql.PreparedStatement;
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12 import java.sql.SQLException;
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13 import java.sql.Connection;
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14 import java.sql.ResultSet;
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15
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16 import net.sf.ehcache.Cache;
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17 import net.sf.ehcache.Element;
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19 import de.intevation.flys.artifacts.cache.CacheFactory;
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21 import org.apache.log4j.Logger;
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22
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23 /** SQL Statement, create PreparedStatement. */
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24 public class CompiledStatement
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25 {
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26 private static Logger log = Logger.getLogger(CompiledStatement.class);
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28 public static final String DATACAGE_DB_CACHE =
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29 "datacage.db";
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30
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31 public static final Pattern VAR =
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32 Pattern.compile("\\$\\{([a-zA-Z0-9_-]+)\\}");
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33
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34 protected String original;
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35 protected String statement;
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36
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37 protected Map<String, List<Integer>> positions;
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38
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39 protected int numVars;
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40
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41 public class Instance {
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42
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43 protected PreparedStatement preparedStatement;
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45 public Instance() {
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46 }
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47
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48 /** Executes a Statement. */
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49 protected ResultData executeCached(
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50 Cache cache,
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51 Connection connection,
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52 StackFrames frames
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53 )
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54 throws SQLException
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55 {
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56 log.debug("executeCached");
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57 Object [] values = new Object[numVars];
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58
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59 StringBuilder sb = new StringBuilder(original);
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60
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61 for (Map.Entry<String, List<Integer>> entry: positions.entrySet()) {
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62 String key = entry.getKey();
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63 Object value = frames.get(key);
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64 sb.append(';').append(key).append(':').append(value);
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65 for (Integer index: entry.getValue()) {
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66 values[index] = value;
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67 }
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68 }
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69
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70 // XXX: Maybe too many collisions?
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71 // String key = original + Arrays.hashCode(values);
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72 String key = sb.toString();
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73
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74 Element element = cache.get(key);
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75
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76 if (element != null) {
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77 return (ResultData)element.getValue();
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78 }
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79
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80 if (preparedStatement == null) {
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81 preparedStatement = connection.prepareStatement(statement);
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82 }
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83
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84 for (int i = 0; i < values.length; ++i) {
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85 preparedStatement.setObject(i+1, values[i]);
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86 }
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87
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88 ResultData data;
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89
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90 if (log.isDebugEnabled()) {
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91 log.debug("executing: " + statement);
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92 }
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93
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94 ResultSet result = preparedStatement.executeQuery();
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95 try {
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96 data = new ResultData(preparedStatement.getMetaData())
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97 .addAll(result);
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98 }
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99 finally {
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100 result.close();
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101 }
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102
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103 element = new Element(key, data);
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104 cache.put(element);
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105
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106 return data;
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107 }
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108
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109 protected ResultData executeUncached(
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110 Connection connection,
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111 StackFrames frames
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112 )
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113 throws SQLException
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114 {
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115 log.debug("executeUncached");
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116 if (preparedStatement == null) {
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117 if (log.isDebugEnabled()) {
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118 log.debug("preparing statement: " + statement);
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119 }
998
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120 preparedStatement = connection.prepareStatement(statement);
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121 }
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122
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123 for (Map.Entry<String, List<Integer>> entry: positions.entrySet()) {
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124 Object value = frames.get(entry.getKey());
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125 for (Integer index: entry.getValue()) {
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126 preparedStatement.setObject(index+1, value);
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127 }
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128 }
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129
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94df49614d92 Made it Oracle compatible
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130 if (log.isDebugEnabled()) {
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131 log.debug("executing: " + statement);
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132 }
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133
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134 ResultSet result = preparedStatement.executeQuery();
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135 try {
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136 return new ResultData(preparedStatement.getMetaData())
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137 .addAll(result);
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138 }
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139 finally {
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140 result.close();
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141 }
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142 }
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143
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144 public ResultData execute(
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145 Connection connection,
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146 StackFrames frames,
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147 boolean cached
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148 )
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149 throws SQLException
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150 {
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151 if (!cached) {
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152 return executeUncached(connection, frames);
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153 }
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154
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155 Cache cache = CacheFactory.getCache(DATACAGE_DB_CACHE);
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156
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157 return cache != null
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158 ? executeCached(cache, connection, frames)
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159 : executeUncached(connection, frames);
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160 }
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161
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162 public void close() {
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163 if (preparedStatement != null) {
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164 try {
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165 preparedStatement.close();
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166 }
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167 catch (SQLException sqle) {
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168 }
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169 preparedStatement = null;
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170 }
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171 }
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172 } // class Instance
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173
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174 public CompiledStatement() {
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175 }
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176
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177 public CompiledStatement(String original) {
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178 this.original = original;
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179 // TreeMap to ensure order
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180 positions = new TreeMap<String, List<Integer>>();
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181 compile();
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182 }
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183
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184 protected void compile() {
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185
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186 StringBuffer sb = new StringBuffer();
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187
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188 Matcher m = VAR.matcher(original);
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189
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190 int index = 0;
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191
4805
722b4962e30e Comment/doc.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 4615
diff changeset
192 // Find variables like ${varname}.
998
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diff changeset
193 while (m.find()) {
1716
3ca999f507b7 flys/issue314: Variables in datacage are now case insensitive.
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parents: 1097
diff changeset
194 String key = m.group(1).toUpperCase();
998
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195 List<Integer> indices = positions.get(key);
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196 if (indices == null) {
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diff changeset
197 indices = new ArrayList<Integer>();
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diff changeset
198 positions.put(key, indices);
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diff changeset
199 }
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diff changeset
200 indices.add(index);
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diff changeset
201 m.appendReplacement(sb, "?");
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parents:
diff changeset
202 ++index;
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parents:
diff changeset
203 }
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diff changeset
204
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diff changeset
205 m.appendTail(sb);
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diff changeset
206
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diff changeset
207 numVars = index;
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diff changeset
208
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diff changeset
209 statement = sb.toString();
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parents:
diff changeset
210 }
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parents:
diff changeset
211
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diff changeset
212 public String getStatement() {
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213 return statement;
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parents:
diff changeset
214 }
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215 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
216 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org