//                                                                           =========
    private static final UserDbm _instance = new UserDbm();

    private UserDbm() {
    }

    public static UserDbm getInstance() {
        return _instance;
    }

    // ===================================================================================

	if s3Err != ErrNone {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL)
		return
	}

	userDN := r.Form.Get("userDN")

	// If listing is requested for a specific user (who is not the request
	// sender), check that the user has permissions.
	if userDN != "" && userDN != cred.ParentUser {
		if !globalIAMSys.IsAllowed(policy.Args{
			AccountName:     cred.AccessKey,
			Groups:          cred.Groups,

    public String asEsIndexType() {
        return "user";
    }

    @Override
    public String asEsSearchType() {
        return "user";
    }

    @Override
    public UserDbm asDBMeta() {
        return UserDbm.getInstance();
    }

    @Override
    protected <RESULT extends User> RESULT createEntity(Map<String, Object> source, Class<? extends RESULT> entityType) {
        try {

    //                                                                             Control
    //                                                                             =======
    @Override
    public UserDbm asDBMeta() {
        return UserDbm.getInstance();
    }

    @Override
    public String asTableDbName() {
        return "user";
    }

    @Override
    public boolean hasSpecifiedColumn() {

     * Converts a user key to a typed user ID.
     * In this implementation, returns the user key as-is.
     *
     * @param userKey the user key to convert
     * @return the typed user ID
     */
    @Override
    protected String toTypedUserId(final String userKey) {
        return userKey;
    }

    // ===================================================================================

                // Invalid value ignored
            }
        }

        // RDMA Configuration
        value = props.getProperty("jcifs.smb.client.useRDMA");
        if (value != null) {
            this.useRDMA = Boolean.parseBoolean(value);
        }

        value = props.getProperty("jcifs.smb.client.rdmaProvider");
        if (value != null) {
            this.rdmaProvider = value;

    //                                                                             DB Meta
    //                                                                             =======
    @Override
    public UserDbm asDBMeta() {
        return UserDbm.getInstance();
    }

    @Override
    public String asTableDbName() {
        return "user";
    }

    }
    
    // Getters...
}
```

## 6. Configuration

### 6.1 Configuration Properties
```java
// In PropertyConfiguration.java
public static final String USE_RDMA = "jcifs.smb.client.useRDMA";
public static final String RDMA_PROVIDER = "jcifs.smb.client.rdmaProvider";
public static final String RDMA_READ_WRITE_THRESHOLD = "jcifs.smb.client.rdmaReadWriteThreshold";

        // WEB-INF/classes
        buf.append("WEB-INF");
        buf.append(File.separator);
        buf.append("classes");
        // target/classes
        final String userDir = System.getProperty("user.dir");
        final File targetDir = new File(userDir, "target");
        final File targetClassesDir = new File(targetDir, "classes");
        if (targetClassesDir.isDirectory()) {
            buf.append(cpSeparator);

        // WEB-INF/classes
        buf.append("WEB-INF");
        buf.append(File.separator);
        buf.append("classes");
        // target/classes
        final String userDir = System.getProperty("user.dir");
        final File targetDir = new File(userDir, "target");
        final File targetClassesDir = new File(targetDir, "classes");
        if (targetClassesDir.isDirectory()) {
            buf.append(cpSeparator);