svn-gvsig-desktop / tags / v1_0_2_Build_898 / libraries / libGDBMS / src / main / java / com / hardcode / gdbms / engine / data / AutomaticDataSource.java @ 10513
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1 | 3199 | fjp | package com.hardcode.gdbms.engine.data; |
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2 | |||
3 | import java.io.IOException; |
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4 | |||
5 | import org.apache.log4j.Logger; |
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6 | |||
7 | 5568 | jmvivo | import com.hardcode.driverManager.Driver; |
8 | 3199 | fjp | import com.hardcode.gdbms.engine.data.driver.DriverException; |
9 | import com.hardcode.gdbms.engine.data.edition.DataWare; |
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10 | import com.hardcode.gdbms.engine.data.persistence.Memento; |
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11 | import com.hardcode.gdbms.engine.data.persistence.MementoException; |
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12 | import com.hardcode.gdbms.engine.internalExceptions.InternalException; |
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13 | import com.hardcode.gdbms.engine.internalExceptions.InternalExceptionCatcher; |
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14 | import com.hardcode.gdbms.engine.internalExceptions.InternalExceptionEvent; |
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15 | import com.hardcode.gdbms.engine.internalExceptions.Task; |
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16 | import com.hardcode.gdbms.engine.internalExceptions.Timer; |
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17 | import com.hardcode.gdbms.engine.values.Value; |
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18 | import com.hardcode.gdbms.engine.values.ValueCollection; |
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19 | |||
20 | |||
21 | /**
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22 | * Decorator over data sources in order to apply a automatic opening mode
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23 | *
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24 | * @author Fernando Gonz?lez Cort?s
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25 | */
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26 | public class AutomaticDataSource implements DataSource { |
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27 | private static Logger logger = Logger.getLogger(AutomaticDataSource.class.getName()); |
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28 | private DataSource ds; |
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29 | private boolean opened = false; |
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30 | private long timeout; |
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31 | private Timer timer = new Timer(); |
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32 | private long lastReset = 0; |
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33 | |||
34 | /**
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35 | * Creates a new AutomaticDataSource.
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36 | *
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37 | * @param ds DataSource to decorate
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38 | * @param timeout DataSource will close if there is no operation
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39 | * int timeout milliseconds
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40 | */
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41 | public AutomaticDataSource(DataSource ds, long timeout) { |
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42 | this.ds = ds;
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43 | this.timeout = timeout;
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44 | } |
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45 | |||
46 | /**
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47 | * @see com.hardcode.gdbms.engine.data.DataSource#start()
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48 | */
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49 | public void start() throws DriverException { |
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50 | //ignored
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51 | } |
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52 | |||
53 | /**
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54 | * @see com.hardcode.gdbms.engine.data.DataSource#stop()
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55 | */
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56 | public void stop() throws DriverException { |
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57 | if (opened){
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58 | close(); |
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59 | } |
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60 | } |
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61 | |||
62 | /**
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63 | * Opens the datasource only if its closed
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64 | *
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65 | * @throws DriverException If the operation fails
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66 | */
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67 | private synchronized void open() throws DriverException { |
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68 | if (opened) {
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69 | /*
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70 | * the resetTimer is a long time operation. Will
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71 | * only call it after a while
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72 | */
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73 | if ((System.currentTimeMillis() - lastReset) > (DataSourceFactory.DEFAULT_DELAY / 2)) { |
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74 | //reset the timer
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75 | logger.info("timer reset");
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76 | 9887 | fjp | timer.resetTimer(); |
77 | 3199 | fjp | lastReset = System.currentTimeMillis();
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78 | } |
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79 | } else {
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80 | opened = true;
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81 | |||
82 | // Se abre
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83 | ds.start(); |
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84 | logger.info("timer start");
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85 | |||
86 | // Se inicia el timer
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87 | timer.schedule(new Task() {
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88 | /**
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89 | * @see com.hardcode.gdbms.engine.internalExceptions.Task#execute()
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90 | */
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91 | public void execute() { |
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92 | try {
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93 | synchronized (AutomaticDataSource.this) {
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94 | if (opened){
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95 | close(); |
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96 | } |
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97 | } |
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98 | } catch (DriverException e) {
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99 | InternalExceptionCatcher.callExceptionRaised(new InternalExceptionEvent(
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100 | AutomaticDataSource.this, |
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101 | new InternalException(
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102 | "Could not automatically close the data source",
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103 | e))); |
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104 | } |
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105 | } |
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106 | |||
107 | }, timeout); |
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108 | } |
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109 | } |
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110 | |||
111 | private void close() throws DriverException { |
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112 | synchronized (this) { |
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113 | //Cerramos el data source
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114 | opened = false;
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115 | ds.stop(); |
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116 | |||
117 | logger.info("datasource closed");
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118 | |||
119 | AutomaticDataSource.this.timer.cancelTimer(); |
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120 | AutomaticDataSource.this.timer = new Timer(); |
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121 | } |
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122 | } |
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123 | |||
124 | /**
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125 | * @see com.hardcode.gdbms.engine.data.DataSource#getName()
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126 | */
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127 | public String getName() { |
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128 | return ds.getName();
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129 | } |
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130 | |||
131 | /**
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132 | * @see com.hardcode.gdbms.engine.data.DataSource#getWhereFilter()
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133 | */
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134 | public long[] getWhereFilter() throws IOException { |
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135 | return ds.getWhereFilter();
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136 | } |
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137 | |||
138 | /**
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139 | * @see com.hardcode.gdbms.engine.data.DataSource#getDataSourceFactory()
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140 | */
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141 | public DataSourceFactory getDataSourceFactory() {
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142 | return ds.getDataSourceFactory();
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143 | } |
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144 | |||
145 | /**
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146 | * @see com.hardcode.gdbms.engine.data.DataSource#getMemento()
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147 | */
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148 | public Memento getMemento() throws MementoException { |
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149 | return ds.getMemento();
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150 | } |
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151 | |||
152 | /**
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153 | * @see com.hardcode.gdbms.engine.data.DataSource#setDataSourceFactory(com.hardcode.gdbms.engine.data.DataSourceFactory)
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154 | */
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155 | public void setDataSourceFactory(DataSourceFactory dsf) { |
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156 | ds.setDataSourceFactory(dsf); |
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157 | } |
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158 | |||
159 | /**
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160 | * @see com.hardcode.gdbms.engine.data.DataSource#setSourceInfo(com.hardcode.gdbms.engine.data.driver.DriverInfo)
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161 | */
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162 | public void setSourceInfo(SourceInfo sourceInfo) { |
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163 | ds.setSourceInfo(sourceInfo); |
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164 | } |
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165 | |||
166 | /**
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167 | * @see com.hardcode.gdbms.engine.data.DataSource#getSourceInfo()
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168 | */
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169 | public SourceInfo getSourceInfo() {
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170 | return ds.getSourceInfo();
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171 | } |
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172 | |||
173 | /**
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174 | * @see com.hardcode.gdbms.engine.data.FieldNameAccess#getFieldIndexByName(java.lang.String)
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175 | */
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176 | public int getFieldIndexByName(String fieldName) throws DriverException { |
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177 | open(); |
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178 | |||
179 | return ds.getFieldIndexByName(fieldName);
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180 | } |
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181 | |||
182 | /**
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183 | * @see com.hardcode.gdbms.engine.data.driver.ReadAccess#getFieldValue(long,
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184 | * int)
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185 | */
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186 | public Value getFieldValue(long rowIndex, int fieldId) |
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187 | throws DriverException {
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188 | open(); |
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189 | |||
190 | return ds.getFieldValue(rowIndex, fieldId);
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191 | } |
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192 | |||
193 | /**
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194 | * @see com.hardcode.gdbms.engine.data.driver.ReadAccess#getFieldCount()
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195 | */
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196 | public int getFieldCount() throws DriverException { |
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197 | open(); |
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198 | |||
199 | return ds.getFieldCount();
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200 | } |
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201 | |||
202 | /**
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203 | * @see com.hardcode.gdbms.engine.data.driver.ReadAccess#getFieldName(int)
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204 | */
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205 | public String getFieldName(int fieldId) throws DriverException { |
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206 | open(); |
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207 | |||
208 | return ds.getFieldName(fieldId);
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209 | } |
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210 | |||
211 | /**
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212 | * @see com.hardcode.gdbms.engine.data.driver.ReadAccess#getRowCount()
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213 | */
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214 | public long getRowCount() throws DriverException { |
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215 | open(); |
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216 | |||
217 | return ds.getRowCount();
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218 | } |
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219 | |||
220 | /**
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221 | * @see com.hardcode.gdbms.engine.data.driver.ReadAccess#getFieldType(int)
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222 | */
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223 | public int getFieldType(int i) throws DriverException { |
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224 | open(); |
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225 | |||
226 | return ds.getFieldType(i);
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227 | } |
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228 | |||
229 | /**
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230 | * @see com.hardcode.gdbms.engine.data.DataSource#getAsString()
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231 | */
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232 | public String getAsString() throws DriverException { |
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233 | return ds.getAsString();
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234 | } |
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235 | |||
236 | /**
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237 | * @throws DriverException
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238 | * @see com.hardcode.gdbms.engine.data.DataSource#remove()
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239 | */
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240 | public void remove() throws DriverException { |
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241 | ds.remove(); |
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242 | } |
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243 | |||
244 | /**
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245 | * @see com.hardcode.gdbms.engine.data.DataSource#getPrimaryKeys()
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246 | */
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247 | public int[] getPrimaryKeys() throws DriverException { |
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248 | open(); |
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249 | return ds.getPrimaryKeys();
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250 | } |
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251 | |||
252 | /**
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253 | * @see com.hardcode.gdbms.engine.data.DataSource#getPKValue(long)
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254 | */
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255 | public ValueCollection getPKValue(long rowIndex) throws DriverException { |
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256 | open(); |
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257 | return ds.getPKValue(rowIndex);
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258 | } |
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259 | |||
260 | /**
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261 | * @see com.hardcode.gdbms.engine.data.DataSource#getPKName(int)
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262 | */
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263 | public String getPKName(int fieldId) throws DriverException { |
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264 | open(); |
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265 | return ds.getPKName(fieldId);
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266 | } |
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267 | |||
268 | /**
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269 | * @see com.hardcode.gdbms.engine.data.DataSource#getPKType(int)
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270 | */
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271 | public int getPKType(int i) throws DriverException { |
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272 | open(); |
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273 | return ds.getPKType(i);
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274 | } |
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275 | |||
276 | /**
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277 | * @throws DriverException
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278 | * @see com.hardcode.gdbms.engine.data.DataSource#getPKCardinality()
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279 | */
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280 | public int getPKCardinality() throws DriverException { |
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281 | open(); |
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282 | return ds.getPKCardinality();
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283 | } |
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284 | |||
285 | /**
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286 | * @see com.hardcode.gdbms.engine.data.DataSource#getRow(long)
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287 | */
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288 | public Value[] getRow(long rowIndex) throws DriverException { |
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289 | open(); |
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290 | return ds.getRow(rowIndex);
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291 | } |
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292 | |||
293 | /**
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294 | * @see com.hardcode.gdbms.engine.data.DataSource#getFieldNames()
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295 | */
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296 | public String[] getFieldNames() throws DriverException { |
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297 | open(); |
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298 | return ds.getFieldNames();
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299 | } |
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300 | |||
301 | /**
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302 | * @see com.hardcode.gdbms.engine.data.DataSource#getPKNames()
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303 | */
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304 | public String[] getPKNames() throws DriverException { |
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305 | open(); |
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306 | return ds.getPKNames();
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307 | } |
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308 | |||
309 | /**
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310 | 4050 | fjp | * @throws DriverException
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311 | 3199 | fjp | * @see com.hardcode.gdbms.engine.data.DataSource#getDataWare()
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312 | */
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313 | 4050 | fjp | public DataWare getDataWare(int mode) throws DriverException { |
314 | 3199 | fjp | return ds.getDataWare(mode);
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315 | } |
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316 | 4851 | jmvivo | |
317 | public int getFieldWidth(int i) throws DriverException { |
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318 | open(); |
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319 | return ds.getFieldWidth(i);
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320 | } |
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321 | 4859 | jmvivo | |
322 | public boolean isVirtualField(int fieldId) throws DriverException { |
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323 | // TODO Auto-generated method stub
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324 | return ds.isVirtualField(fieldId);
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325 | } |
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326 | 5568 | jmvivo | |
327 | public Driver getDriver() { |
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328 | return ds.getDriver();
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329 | } |
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330 | 6314 | jmvivo | |
331 | 6323 | fjp | public void reload() throws DriverException, IOException { |
332 | 6314 | jmvivo | this.stop();
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333 | ds.reload(); |
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334 | } |
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335 | |||
336 | public void addDataSourceListener(IDataSourceListener listener) { |
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337 | ds.addDataSourceListener(listener); |
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338 | |||
339 | } |
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340 | |||
341 | public void removeDataSourceListener(IDataSourceListener listener) { |
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342 | ds.removeDataSourceListener(listener); |
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343 | |||
344 | } |
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345 | 3199 | fjp | } |