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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.cassandra.locator;

import java.net.InetAddress;
import java.util.Collection;
import java.util.List;

/**
 * This interface helps determine location of node in the data center relative to another node.
 * Give a node A and another node B it can tell if A and B are on the same rack or in the same
 * data center.
 */

public interface IEndpointSnitch
{
    /**
     * returns a String repesenting the rack this endpoint belongs to
     */
    public String getRack(InetAddress endpoint);

    /**
     * returns a String representing the datacenter this endpoint belongs to
     */
    public String getDatacenter(InetAddress endpoint);

    /**
     * returns a new List sorted by proximity to the given endpoint
     */
    public List getSortedListByProximity(InetAddress address, Collection unsortedAddress);

    /**
     * This method will sort the List by proximity to the given address.
     */
    public void sortByProximity(InetAddress address, List addresses);

    /**
     * compares two endpoints in relation to the target endpoint, returning as Comparator.compare would
     */
    public int compareEndpoints(InetAddress target, InetAddress a1, InetAddress a2);

    /**
     * called after Gossiper instance exists immediately before it starts gossiping
     */
    public void gossiperStarting();

    /**
     * Returns whether for a range query doing a query against merged is likely
     * to be faster than 2 sequential queries, one against l1 followed by one against l2.
     */
    public boolean isWorthMergingForRangeQuery(List merged, List l1, List l2);
}