server/src/org/apache/cloudstack/agent/lb/algorithm/IndirectAgentLBShuffleAlgorithm.java

// 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,
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package org.apache.cloudstack.agent.lb.algorithm;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;
import org.apache.cloudstack.agent.lb.IndirectAgentLBAlgorithm;
import org.apache.commons.collections.SetUtils;

public class IndirectAgentLBShuffleAlgorithm implements IndirectAgentLBAlgorithm {

    @Override
    public List<String> sort(final List<String> msList, final List<Long> orderedHostList, final Long hostId) {
        final List<String> randomList = new ArrayList<>(msList);
        Collections.shuffle(randomList, new Random(System.currentTimeMillis()));
        return randomList;
    }

    @Override
    public String getName() {
        return "shuffle";
    }

    @Override
    public boolean compare(List<String> msList, List<String> receivedMsList) {
        return SetUtils.isEqualSet(msList, receivedMsList);
    }
}