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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2013, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.wildfly.clustering.web.session;

import java.util.Set;

/**
 * Provides read-only access to a session's attributes.
 * @author Paul Ferraro
 */
public interface ImmutableSessionAttributes {
    /**
     * Returns the names of the attributes of this session.
     * @return a set of unique attribute names
     */
    Set getAttributeNames();

    /**
     * Retrieves the value of the specified attribute.
     * @param name a unique attribute name
     * @return the attribute value, or null if the attribute does not exist.
     */
    Object getAttribute(String name);
}