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Microsoft JDBC Driver for SQL Server.
There is a newer version: 12.8.1.jre11
/*
 * 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.sql.SQLException;
import java.util.logging.Level;

import javax.naming.Reference;
import javax.sql.ConnectionPoolDataSource;
import javax.sql.PooledConnection;

/**
 * SQLServerConnectionPoolDataSource provides physical database connections for connection pool managers. SQLServerConnectionPoolDataSource is
 * typically used in Java Application Server environments that support built-in connection pooling and require a ConnectionPoolDataSource to provide
 * physical connections. For example, J2EE application servers that provide JDBC 3.0 API spec connection pooling.
 *
 */

public class SQLServerConnectionPoolDataSource extends SQLServerDataSource implements ConnectionPoolDataSource {
    // Get a new physical connection that the pool manager will issue logical connections from
    /* L0 */ public PooledConnection getPooledConnection() throws SQLException {
        if (loggerExternal.isLoggable(Level.FINER))
            loggerExternal.entering(getClassNameLogging(), "getPooledConnection");
        PooledConnection pcon = getPooledConnection(getUser(), getPassword());
        if (loggerExternal.isLoggable(Level.FINER))
            loggerExternal.exiting(getClassNameLogging(), "getPooledConnection", pcon);
        return pcon;
    }

    /* L0 */ public PooledConnection getPooledConnection(String user,
            String password) throws SQLException {
        if (loggerExternal.isLoggable(Level.FINER))
            loggerExternal.entering(getClassNameLogging(), "getPooledConnection", new Object[] {user, "Password not traced"});
        SQLServerPooledConnection pc = new SQLServerPooledConnection(this, user, password);
        if (loggerExternal.isLoggable(Level.FINER))
            loggerExternal.exiting(getClassNameLogging(), "getPooledConnection", pc);
        return pc;
    }

    // Implement javax.naming.Referenceable interface methods.

    public Reference getReference() {
        if (loggerExternal.isLoggable(Level.FINER))
            loggerExternal.entering(getClassNameLogging(), "getReference");
        Reference ref = getReferenceInternal("com.microsoft.sqlserver.jdbc.SQLServerConnectionPoolDataSource");
        if (loggerExternal.isLoggable(Level.FINER))
            loggerExternal.exiting(getClassNameLogging(), "getReference", ref);
        return ref;
    }

    private Object writeReplace() throws java.io.ObjectStreamException {
        return new SerializationProxy(this);
    }

    private void readObject(java.io.ObjectInputStream stream) throws java.io.InvalidObjectException {
        // For added security/robustness, the only way to rehydrate a serialized SQLServerDataSource
        // is to use a SerializationProxy. Direct use of readObject() is not supported.
        throw new java.io.InvalidObjectException("");
    }

    // This is 90% duplicate from the SQLServerDataSource, the serialization proxy pattern does not lend itself to inheritance
    // so the duplication is necessary
    private static class SerializationProxy implements java.io.Serializable {
        private final Reference ref;
        private static final long serialVersionUID = 654661379842314126L;

        SerializationProxy(SQLServerConnectionPoolDataSource ds) {
            // We do not need the class name so pass null, serialization mechanism
            // stores the class info.
            ref = ds.getReferenceInternal(null);
        }

        private Object readResolve() {
            SQLServerConnectionPoolDataSource ds = new SQLServerConnectionPoolDataSource();
            ds.initializeFromReference(ref);
            return ds;
        }
    }

}