/*
 * Copyright 2015 Open Networking Laboratory
 *
 * 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.onosproject.net.intent;

import org.onosproject.cluster.NodeId;

/**
 * Service for interacting with the partition-to-instance assignments.
 */
public interface PartitionService {

    /**
     * Returns whether the given intent key is in a partition owned by this
     * instance or not.
     *
     * @param intentKey intent key to query
     * @return true if the key is owned by this instance, otherwise false
     */
    boolean isMine(Key intentKey);

    /**
     * Returns the leader for a particular key.
     *
     * @param intentKey intent key to query
     * @return the leader node
     */
    NodeId getLeader(Key intentKey);

    // TODO add API for rebalancing partitions

    /**
     * Registers a event listener to be notified of partition events.
     *
     * @param listener listener that will asynchronously notified of partition events.
     */
    void addListener(PartitionEventListener listener);

    /**
     * Unregisters a event listener for partition events.
     *
     * @param listener listener to be removed.
     */
    void removeListener(PartitionEventListener listener);
}