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A TDH_SOCKET Client For Java
package com.taobao.tdhs.jdbc;
import javax.sql.DataSource;
import java.io.PrintWriter;
import java.sql.*;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicLong;
import java.util.logging.Logger;
/**
* 带池功能的DataSource
*
* @author 文通
* @since 12-6-26 下午3:50
*/
public class SimplePooledTDHSDataSource implements DataSource {
private PrintWriter logWriter;
private PooledTDHSConnection lastOne = null;
private AtomicLong count = new AtomicLong(0);
private final String url;
/**
* Constructor SimplePooledTDHSDataSource creates a new SimplePooledTDHSDataSource instance.
*
* @param url of type String
*/
public SimplePooledTDHSDataSource(String url) {
this.url = url;
}
/**
* Method getConnection returns the connection of this PooledTDHSDataSource object.
*
* @return the connection (type Connection) of this PooledTDHSDataSource object.
*
* @throws SQLException when
*/
public synchronized Connection getConnection() throws SQLException {
PooledTDHSConnection ret;
if (count.get() == 0 && lastOne != null) {
ret = lastOne;
lastOne = null;
} else {
try {
ret = new PooledTDHSConnection(createConnection(), this);
} catch (Exception e) {
throw new SQLException(e);
}
}
count.incrementAndGet();
return ret;
}
/**
* Method createConnection ...
*
* @return Connection
*/
private TDHSConnection createConnection() throws SQLException, ClassNotFoundException {
Class.forName("com.taobao.tdhs.jdbc.Driver");
return (TDHSConnection) DriverManager.getConnection(url, null, null);
}
/**
* Method returnToDataSource ...
*
* @param conn of type PooledTDHSConnection
*
* @return boolean true mean cached can't be real close
*/
private synchronized boolean returnToDataSource(PooledTDHSConnection conn) {
if (count.decrementAndGet() == 0) {
lastOne = conn;
return true;
}
return false;
}
/**
* Method getConnection ...
*
* @param username of type String
* @param password of type String
*
* @return Connection
*
* @throws SQLException when
*/
public Connection getConnection(String username, String password) throws SQLException {
return getConnection();
}
/**
* Method getLogWriter returns the logWriter of this PooledTDHSDataSource object.
*
* @return the logWriter (type PrintWriter) of this PooledTDHSDataSource object.
*
* @throws SQLException when
*/
public PrintWriter getLogWriter() throws SQLException {
return logWriter;
}
/**
* Method setLogWriter sets the logWriter of this PooledTDHSDataSource object.
*
* @param out the logWriter of this PooledTDHSDataSource object.
*
* @throws SQLException when
*/
public void setLogWriter(PrintWriter out) throws SQLException {
this.logWriter = out;
}
/**
* Method setLoginTimeout sets the loginTimeout of this PooledTDHSDataSource object.
*
* @param seconds the loginTimeout of this PooledTDHSDataSource object.
*
* @throws SQLException when
*/
public void setLoginTimeout(int seconds) throws SQLException {
}
/**
* Method getLoginTimeout returns the loginTimeout of this PooledTDHSDataSource object.
*
* @return the loginTimeout (type int) of this PooledTDHSDataSource object.
*
* @throws SQLException when
*/
public int getLoginTimeout() throws SQLException {
return 0;
}
/**
* Method getParentLogger returns the parentLogger of this PooledTDHSDataSource object.
*
* @return the parentLogger (type Logger) of this PooledTDHSDataSource object.
*
* @throws SQLFeatureNotSupportedException
* when
*/
public Logger getParentLogger() throws SQLFeatureNotSupportedException {
return null;
}
/**
* Method unwrap ...
*
* @param iface of type Class
*
* @return T
*
* @throws SQLException when
*/
public T unwrap(Class iface) throws SQLException {
try {
// This works for classes that aren't actually wrapping
// anything
return iface.cast(this);
} catch (ClassCastException cce) {
throw new SQLException(cce);
}
}
/**
* Method isWrapperFor ...
*
* @param iface of type Class
*
* @return boolean
*
* @throws SQLException when
*/
public boolean isWrapperFor(Class iface) throws SQLException {
return iface.isInstance(this);
}
private class PooledTDHSConnection implements Connection {
private TDHSConnection tdhsConn;
private SimplePooledTDHSDataSource pooledTDHSDataSource;
private PooledTDHSConnection(TDHSConnection tdhsConn, SimplePooledTDHSDataSource pooledTDHSDataSource) {
this.tdhsConn = tdhsConn;
this.pooledTDHSDataSource = pooledTDHSDataSource;
}
public Statement createStatement() throws SQLException {
return tdhsConn.createStatement();
}
public PreparedStatement prepareStatement(String sql) throws SQLException {
return tdhsConn.prepareStatement(sql);
}
public CallableStatement prepareCall(String sql) throws SQLException {
return tdhsConn.prepareCall(sql);
}
public String nativeSQL(String sql) throws SQLException {
return tdhsConn.nativeSQL(sql);
}
public void setAutoCommit(boolean autoCommit) throws SQLException {
tdhsConn.setAutoCommit(autoCommit);
}
public boolean getAutoCommit() throws SQLException {
return tdhsConn.getAutoCommit();
}
public void commit() throws SQLException {
tdhsConn.commit();
}
public void rollback() throws SQLException {
tdhsConn.rollback();
}
public void close() throws SQLException {
if (!pooledTDHSDataSource.returnToDataSource(this)) {
tdhsConn.close();
}
}
public boolean isClosed() throws SQLException {
return tdhsConn.isClosed();
}
public DatabaseMetaData getMetaData() throws SQLException {
return tdhsConn.getMetaData();
}
public void setReadOnly(boolean readOnly) throws SQLException {
tdhsConn.setReadOnly(readOnly);
}
public boolean isReadOnly() throws SQLException {
return tdhsConn.isReadOnly();
}
public void setCatalog(String catalog) throws SQLException {
tdhsConn.setCatalog(catalog);
}
public String getCatalog() throws SQLException {
return tdhsConn.getCatalog();
}
public void setTransactionIsolation(int level) throws SQLException {
tdhsConn.setTransactionIsolation(level);
}
public int getTransactionIsolation() throws SQLException {
return tdhsConn.getTransactionIsolation();
}
public SQLWarning getWarnings() throws SQLException {
return tdhsConn.getWarnings();
}
public void clearWarnings() throws SQLException {
tdhsConn.clearWarnings();
}
public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException {
return tdhsConn.createStatement(resultSetType, resultSetConcurrency);
}
public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency)
throws SQLException {
return tdhsConn.prepareStatement(sql, resultSetType, resultSetConcurrency);
}
public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency)
throws SQLException {
return tdhsConn.prepareCall(sql, resultSetType, resultSetConcurrency);
}
public Map> getTypeMap() throws SQLException {
return tdhsConn.getTypeMap();
}
public void setTypeMap(Map> map) throws SQLException {
tdhsConn.setTypeMap(map);
}
public void setHoldability(int holdability) throws SQLException {
tdhsConn.setHoldability(holdability);
}
public int getHoldability() throws SQLException {
return tdhsConn.getHoldability();
}
public Savepoint setSavepoint() throws SQLException {
return tdhsConn.setSavepoint();
}
public Savepoint setSavepoint(String name) throws SQLException {
return tdhsConn.setSavepoint(name);
}
public void rollback(Savepoint savepoint) throws SQLException {
tdhsConn.rollback(savepoint);
}
public void releaseSavepoint(Savepoint savepoint) throws SQLException {
tdhsConn.releaseSavepoint(savepoint);
}
public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability)
throws SQLException {
return tdhsConn.createStatement(resultSetType, resultSetConcurrency, resultSetHoldability);
}
public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency,
int resultSetHoldability) throws SQLException {
return tdhsConn.prepareStatement(sql, resultSetType, resultSetConcurrency, resultSetHoldability);
}
public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency,
int resultSetHoldability) throws SQLException {
return tdhsConn.prepareCall(sql, resultSetType, resultSetConcurrency, resultSetHoldability);
}
public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException {
return tdhsConn.prepareStatement(sql, autoGeneratedKeys);
}
public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {
return tdhsConn.prepareStatement(sql, columnIndexes);
}
public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {
return tdhsConn.prepareStatement(sql, columnNames);
}
public Clob createClob() throws SQLException {
return tdhsConn.createClob();
}
public Blob createBlob() throws SQLException {
return tdhsConn.createBlob();
}
public NClob createNClob() throws SQLException {
return tdhsConn.createNClob();
}
public SQLXML createSQLXML() throws SQLException {
return tdhsConn.createSQLXML();
}
public boolean isValid(int timeout) throws SQLException {
return tdhsConn.isValid(timeout);
}
public void setClientInfo(String name, String value) throws SQLClientInfoException {
tdhsConn.setClientInfo(name, value);
}
public void setClientInfo(Properties properties) throws SQLClientInfoException {
tdhsConn.setClientInfo(properties);
}
public String getClientInfo(String name) throws SQLException {
return tdhsConn.getClientInfo(name);
}
public Properties getClientInfo() throws SQLException {
return tdhsConn.getClientInfo();
}
public Array createArrayOf(String typeName, Object[] elements) throws SQLException {
return tdhsConn.createArrayOf(typeName, elements);
}
public Struct createStruct(String typeName, Object[] attributes) throws SQLException {
return tdhsConn.createStruct(typeName, attributes);
}
public void setSchema(String schema) throws SQLException {
tdhsConn.setSchema(schema);
}
public String getSchema() throws SQLException {
return tdhsConn.getSchema();
}
public void abort(Executor executor) throws SQLException {
tdhsConn.abort(executor);
}
public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException {
tdhsConn.setNetworkTimeout(executor, milliseconds);
}
public int getNetworkTimeout() throws SQLException {
return tdhsConn.getNetworkTimeout();
}
public T unwrap(Class iface) throws SQLException {
return tdhsConn.unwrap(iface);
}
public boolean isWrapperFor(Class iface) throws SQLException {
return tdhsConn.isWrapperFor(iface);
}
}
}
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