/**
 * Copyright (C) 2004-2006 Jive Software. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jivesoftware.xmpp.workgroup.dispatcher;

import org.jivesoftware.xmpp.workgroup.AgentSession;
import org.jivesoftware.xmpp.workgroup.Offer;

import java.util.List;

/**
 * Algorithm that selects the best agent of the queue for receiving an offer.
 *
 * @author Gaston Dombiak
 */
public interface AgentSelector {

    /**
     * Returns true if an agent session may receive an offer. Once all the agent sessions of
     * the queue have been validated
     * {@link #bestAgentFrom(List, Offer)}  will
     * be invoked to select the agent that will effectively get the offer.
     *
     * @param session the session to check if it may receive an offer.
     * @param offer the offer that the agent may receive.
     * @return true if the agent session may receive an offer.
     */
    boolean validateAgent(AgentSession session, Offer offer);

    /**
     * Returns the agent that will receive the offer from the previously validated list
     * of agents.
     *
     * @param possibleSessions the list of agents that are in condition to get the offer.
     * @param offer the offer that the agent may receive.
     * @return the agent that will receive the offer from the previously validated list
     *         of agents.
     */
    AgentSession bestAgentFrom(List<AgentSession> possibleSessions, Offer offer);

}
