import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;

import javax.security.auth.Subject;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import jcifs.CIFSContext;
import jcifs.CIFSException;
import jcifs.Configuration;
import jcifs.DialectVersion;
import jcifs.RuntimeCIFSException;
import jcifs.SmbConstants;
import jcifs.SmbSession;

    @Override
    public SmbSessionImpl getSmbSession(final CIFSContext tf) {
        return getSmbSession(tf, null, null);
    }

    /**
     *
     * @param tf
     *            context to use
     * @return a session for the context
     */
    @Override
    @SuppressWarnings("resource")
    public synchronized SmbSessionImpl getSmbSession(final CIFSContext tf, String targetHost, String targetDomain) {

        // Verify source exists
        CIFSContext verifyContext = createFreshContext();
        SmbFile verifySource = new SmbFile(baseUrl + "shared/" + sourceFileName, verifyContext);
        assertTrue(verifySource.exists(), "Source file should exist");

        // Perform rename using copy+delete as this is more reliable with Docker/Samba
        CIFSContext renameContext = createFreshContext();