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Microsoft JDBC Driver for SQL Server.
/*
* Microsoft JDBC Driver for SQL Server Copyright(c) Microsoft Corporation All rights reserved. This program is made
* available under the terms of the MIT License. See the LICENSE file in the project root for more information.
*/
package com.microsoft.sqlserver.jdbc;
import java.io.Serializable;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Vector;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;
import javax.sql.ConnectionEvent;
import javax.sql.ConnectionEventListener;
import javax.sql.PooledConnection;
import javax.sql.StatementEventListener;
/**
* Represents a physical database connection in a connection pool. If provides methods for the connection pool manager
* to manage the connection pool. Applications typically do not instantiate these connections directly.
*/
public class SQLServerPooledConnection implements PooledConnection, Serializable {
/**
* Always update serialVersionUID when prompted.
*/
private static final long serialVersionUID = 3492921646187451164L;
/** listeners */
private final Vector listeners;
/** factory datasource */
private SQLServerDataSource factoryDataSource;
/** physical connection */
private SQLServerConnection physicalConnection;
/** last proxy connection */
private SQLServerConnectionPoolProxy lastProxyConnection;
/** factory password */
private String factoryUser, factoryPassword;
/** logger */
private java.util.logging.Logger pcLogger;
/** trace ID */
private final String traceID;
// Unique id generator for each PooledConnection instance (used for logging).
static private final AtomicInteger basePooledConnectionID = new AtomicInteger(0);
SQLServerPooledConnection(SQLServerDataSource ds, String user, String password) throws SQLException {
listeners = new Vector<>();
// Piggyback SQLServerDataSource logger for now.
pcLogger = SQLServerDataSource.dsLogger;
// Create the physical connection.
factoryDataSource = ds;
factoryUser = user;
factoryPassword = password;
if (pcLogger.isLoggable(Level.FINER))
pcLogger.finer(toString() + " Start create new connection for pool.");
physicalConnection = createNewConnection();
String nameL = getClass().getName();
traceID = nameL.substring(1 + nameL.lastIndexOf('.')) + ":" + nextPooledConnectionID();
if (pcLogger.isLoggable(Level.FINE))
pcLogger.fine(toString() + " created by (" + ds.toString() + ")" + " Physical connection " + safeCID()
+ ", End create new connection for pool");
}
/**
* Provides a helper function to provide an ID string suitable for tracing.
*
* @return traceID String
*/
@Override
public String toString() {
return traceID;
}
/**
* Helper function to create a new connection for the pool.
*
* @return SQLServerConnection instance
* @throws SQLException
*/
private SQLServerConnection createNewConnection() throws SQLException {
return factoryDataSource.getConnectionInternal(factoryUser, factoryPassword, this);
}
/**
* Returns an object handle for the physical connection that this PooledConnection object represents.
*
* @throws SQLException
* when an error occurs
* @return a Connection object that is a handle to this PooledConnection object
*/
@Override
public Connection getConnection() throws SQLException {
if (pcLogger.isLoggable(Level.FINER))
pcLogger.finer(toString() + " user:(default).");
synchronized (this) {
// If physical connection is closed, throw exception per spec, this PooledConnection is dead.
if (physicalConnection == null) {
SQLServerException.makeFromDriverError(null, this,
SQLServerException.getErrString("R_physicalConnectionIsClosed"), "", true);
}
/*
* Check with security manager to insure caller has rights to connect. This will throw a SecurityException
* if the caller does not have proper rights.
*/
physicalConnection.doSecurityCheck();
if (pcLogger.isLoggable(Level.FINE))
pcLogger.fine(toString() + " Physical connection, " + safeCID());
if (physicalConnection.needsReconnect()) {
physicalConnection.close();
physicalConnection = createNewConnection();
}
/*
* The last proxy connection handle returned will be invalidated (moved to closed state) when getConnection
* is called.
*/
if (null != lastProxyConnection) {
// if there was a last proxy connection send reset
physicalConnection.resetPooledConnection();
if (!lastProxyConnection.isClosed()) {
if (pcLogger.isLoggable(Level.FINE)) {
pcLogger.fine(toString() + "proxy " + lastProxyConnection.toString()
+ " is not closed before getting the connection.");
}
/*
* use internal close so there wont be an event due to us closing the connection, if not closed
* already.
*/
lastProxyConnection.internalClose();
}
}
lastProxyConnection = new SQLServerConnectionPoolProxy(physicalConnection);
if (pcLogger.isLoggable(Level.FINE) && !lastProxyConnection.isClosed())
pcLogger.fine(toString() + " proxy " + lastProxyConnection.toString() + " is returned.");
return lastProxyConnection;
}
}
/**
* Notifies any interested parties (e.g. pooling managers) of a ConnectionEvent activity on the connection. Calling
* notifyEvent with null event will place the connection back in the pool. Calling notifyEvent with a non-null event
* is used to notify the pooling manager that the connection is bad and should be removed from the pool.
*/
void notifyEvent(SQLServerException e) {
if (pcLogger.isLoggable(Level.FINER))
pcLogger.finer(toString() + " Exception:" + e + safeCID());
// close the proxy on fatal error event. Note exception is null then the event comes from the proxy close.
if (null != e) {
synchronized (this) {
if (null != lastProxyConnection) {
lastProxyConnection.internalClose();
lastProxyConnection = null;
}
}
}
// A connection handle issued from this pooled connection is closing or an error occurred in the connection
synchronized (listeners) {
for (int i = 0; i < listeners.size(); i++) {
ConnectionEventListener listener = listeners.elementAt(i);
if (listener == null)
continue;
ConnectionEvent ev = new ConnectionEvent(this, e);
if (null == e) {
if (pcLogger.isLoggable(Level.FINER))
pcLogger.finer(toString() + " notifyEvent:connectionClosed " + safeCID());
listener.connectionClosed(ev);
} else {
if (pcLogger.isLoggable(Level.FINER))
pcLogger.finer(toString() + " notifyEvent:connectionErrorOccurred " + safeCID());
listener.connectionErrorOccurred(ev);
}
}
}
}
@Override
public void addConnectionEventListener(ConnectionEventListener listener) {
if (pcLogger.isLoggable(Level.FINER))
pcLogger.finer(toString() + safeCID());
synchronized (listeners) {
listeners.add(listener);
}
}
@Override
public void close() throws SQLException {
if (pcLogger.isLoggable(Level.FINER))
pcLogger.finer(toString() + " Closing physical connection, " + safeCID());
synchronized (this) {
// First close the last proxy
if (null != lastProxyConnection)
// use internal close so there wont be an event due to us closing the connection, if not closed already.
lastProxyConnection.internalClose();
if (null != physicalConnection) {
physicalConnection.DetachFromPool();
physicalConnection.close();
}
physicalConnection = null;
}
synchronized (listeners) {
listeners.clear();
}
}
@Override
public void removeConnectionEventListener(ConnectionEventListener listener) {
if (pcLogger.isLoggable(Level.FINER))
pcLogger.finer(toString() + safeCID());
synchronized (listeners) {
listeners.remove(listener);
}
}
@Override
public void addStatementEventListener(StatementEventListener listener) {
// Not implemented
throw new UnsupportedOperationException(SQLServerException.getErrString("R_notSupported"));
}
@Override
public void removeStatementEventListener(StatementEventListener listener) {
// Not implemented
throw new UnsupportedOperationException(SQLServerException.getErrString("R_notSupported"));
}
// Returns internal physical connection to caller.
SQLServerConnection getPhysicalConnection() {
return physicalConnection;
}
// Returns unique id for each PooledConnection instance.
private static int nextPooledConnectionID() {
return basePooledConnectionID.incrementAndGet();
}
/**
* Helper function to return connectionID of the physicalConnection in a safe manner for logging. Returns (null) if
* physicalConnection is null, otherwise returns connectionID.
**/
private String safeCID() {
if (null == physicalConnection)
return " ConnectionID:(null)";
return physicalConnection.toString();
}
}