svn-gvsig-desktop / tags / v1_1_Build_1002 / libraries / libGDBMS / src / main / java / com / hardcode / gdbms / engine / data / AutomaticDataSource.java @ 12070
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package com.hardcode.gdbms.engine.data; |
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import java.io.IOException; |
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import org.apache.log4j.Logger; |
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import com.hardcode.driverManager.Driver; |
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import com.hardcode.gdbms.engine.data.driver.DriverException; |
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import com.hardcode.gdbms.engine.data.edition.DataWare; |
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import com.hardcode.gdbms.engine.data.persistence.Memento; |
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import com.hardcode.gdbms.engine.data.persistence.MementoException; |
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import com.hardcode.gdbms.engine.internalExceptions.InternalException; |
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import com.hardcode.gdbms.engine.internalExceptions.InternalExceptionCatcher; |
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import com.hardcode.gdbms.engine.internalExceptions.InternalExceptionEvent; |
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import com.hardcode.gdbms.engine.internalExceptions.Task; |
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import com.hardcode.gdbms.engine.internalExceptions.Timer; |
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import com.hardcode.gdbms.engine.values.Value; |
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import com.hardcode.gdbms.engine.values.ValueCollection; |
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/**
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* Decorator over data sources in order to apply a automatic opening mode
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*
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* @author Fernando Gonz?lez Cort?s
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*/
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public class AutomaticDataSource implements DataSource { |
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private static Logger logger = Logger.getLogger(AutomaticDataSource.class.getName()); |
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private DataSource ds; |
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private boolean opened = false; |
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private long timeout; |
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private Timer timer = new Timer(); |
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private long lastReset = 0; |
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/**
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* Creates a new AutomaticDataSource.
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*
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* @param ds DataSource to decorate
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* @param timeout DataSource will close if there is no operation
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* int timeout milliseconds
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*/
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public AutomaticDataSource(DataSource ds, long timeout) { |
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this.ds = ds;
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this.timeout = timeout;
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#start()
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*/
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public void start() throws DriverException { |
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//ignored
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#stop()
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*/
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public void stop() throws DriverException { |
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if (opened){
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close(); |
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} |
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} |
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/**
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* Opens the datasource only if its closed
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*
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* @throws DriverException If the operation fails
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*/
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private synchronized void open() throws DriverException { |
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if (opened) {
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/*
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* the resetTimer is a long time operation. Will
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* only call it after a while
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*/
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if ((System.currentTimeMillis() - lastReset) > (DataSourceFactory.DEFAULT_DELAY / 2)) { |
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//reset the timer
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logger.info("timer reset");
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timer.resetTimer(); |
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lastReset = System.currentTimeMillis();
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} |
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} else {
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opened = true;
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// Se abre
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ds.start(); |
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logger.info("timer start");
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// Se inicia el timer
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timer.schedule(new Task() {
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/**
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* @see com.hardcode.gdbms.engine.internalExceptions.Task#execute()
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*/
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public void execute() { |
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try {
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synchronized (AutomaticDataSource.this) {
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if (opened){
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close(); |
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} |
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} |
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} catch (DriverException e) {
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InternalExceptionCatcher.callExceptionRaised(new InternalExceptionEvent(
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AutomaticDataSource.this, |
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new InternalException(
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"Could not automatically close the data source",
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e))); |
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} |
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} |
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}, timeout); |
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} |
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} |
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private void close() throws DriverException { |
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synchronized (this) { |
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//Cerramos el data source
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opened = false;
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ds.stop(); |
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logger.info("datasource closed");
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AutomaticDataSource.this.timer.cancelTimer(); |
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AutomaticDataSource.this.timer = new Timer(); |
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} |
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#getName()
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*/
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public String getName() { |
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return ds.getName();
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#getWhereFilter()
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*/
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public long[] getWhereFilter() throws IOException { |
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return ds.getWhereFilter();
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#getDataSourceFactory()
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*/
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public DataSourceFactory getDataSourceFactory() {
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return ds.getDataSourceFactory();
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#getMemento()
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*/
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public Memento getMemento() throws MementoException { |
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return ds.getMemento();
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#setDataSourceFactory(com.hardcode.gdbms.engine.data.DataSourceFactory)
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*/
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public void setDataSourceFactory(DataSourceFactory dsf) { |
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ds.setDataSourceFactory(dsf); |
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#setSourceInfo(com.hardcode.gdbms.engine.data.driver.DriverInfo)
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*/
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public void setSourceInfo(SourceInfo sourceInfo) { |
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ds.setSourceInfo(sourceInfo); |
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#getSourceInfo()
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*/
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public SourceInfo getSourceInfo() {
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return ds.getSourceInfo();
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.FieldNameAccess#getFieldIndexByName(java.lang.String)
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*/
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public int getFieldIndexByName(String fieldName) throws DriverException { |
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open(); |
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return ds.getFieldIndexByName(fieldName);
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.driver.ReadAccess#getFieldValue(long,
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* int)
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*/
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public Value getFieldValue(long rowIndex, int fieldId) |
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throws DriverException {
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open(); |
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return ds.getFieldValue(rowIndex, fieldId);
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.driver.ReadAccess#getFieldCount()
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*/
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public int getFieldCount() throws DriverException { |
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open(); |
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return ds.getFieldCount();
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.driver.ReadAccess#getFieldName(int)
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*/
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public String getFieldName(int fieldId) throws DriverException { |
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open(); |
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return ds.getFieldName(fieldId);
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.driver.ReadAccess#getRowCount()
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*/
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public long getRowCount() throws DriverException { |
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open(); |
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return ds.getRowCount();
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.driver.ReadAccess#getFieldType(int)
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*/
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public int getFieldType(int i) throws DriverException { |
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open(); |
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return ds.getFieldType(i);
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#getAsString()
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*/
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public String getAsString() throws DriverException { |
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return ds.getAsString();
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} |
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/**
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* @throws DriverException
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* @see com.hardcode.gdbms.engine.data.DataSource#remove()
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*/
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public void remove() throws DriverException { |
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ds.remove(); |
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#getPrimaryKeys()
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*/
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public int[] getPrimaryKeys() throws DriverException { |
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open(); |
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return ds.getPrimaryKeys();
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#getPKValue(long)
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*/
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public ValueCollection getPKValue(long rowIndex) throws DriverException { |
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open(); |
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return ds.getPKValue(rowIndex);
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#getPKName(int)
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*/
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public String getPKName(int fieldId) throws DriverException { |
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open(); |
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return ds.getPKName(fieldId);
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#getPKType(int)
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*/
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public int getPKType(int i) throws DriverException { |
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open(); |
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return ds.getPKType(i);
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} |
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/**
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* @throws DriverException
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* @see com.hardcode.gdbms.engine.data.DataSource#getPKCardinality()
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*/
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public int getPKCardinality() throws DriverException { |
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open(); |
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return ds.getPKCardinality();
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#getRow(long)
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*/
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public Value[] getRow(long rowIndex) throws DriverException { |
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open(); |
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return ds.getRow(rowIndex);
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#getFieldNames()
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*/
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public String[] getFieldNames() throws DriverException { |
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open(); |
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return ds.getFieldNames();
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} |
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/**
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* @see com.hardcode.gdbms.engine.data.DataSource#getPKNames()
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*/
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public String[] getPKNames() throws DriverException { |
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open(); |
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return ds.getPKNames();
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} |
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/**
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* @throws DriverException
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* @see com.hardcode.gdbms.engine.data.DataSource#getDataWare()
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*/
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public DataWare getDataWare(int mode) throws DriverException { |
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return ds.getDataWare(mode);
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} |
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public int getFieldWidth(int i) throws DriverException { |
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open(); |
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return ds.getFieldWidth(i);
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} |
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public boolean isVirtualField(int fieldId) throws DriverException { |
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// TODO Auto-generated method stub
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return ds.isVirtualField(fieldId);
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} |
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public Driver getDriver() { |
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return ds.getDriver();
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} |
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public void reload() throws DriverException, IOException { |
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this.stop();
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ds.reload(); |
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} |
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public void addDataSourceListener(IDataSourceListener listener) { |
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ds.addDataSourceListener(listener); |
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} |
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public void removeDataSourceListener(IDataSourceListener listener) { |
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ds.removeDataSourceListener(listener); |
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} |
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} |