75 lines
2.4 KiB
Java
75 lines
2.4 KiB
Java
/*
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* The MIT License
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* Copyright © 2014-2021 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.leaderelection;
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import java.util.List;
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import java.util.Map;
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import java.util.stream.Collectors;
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/**
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* Abstract class of all the message manager classes.
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*/
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public abstract class AbstractMessageManager implements MessageManager {
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/**
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* Contain all the instances in the system. Key is its ID, and value is the instance itself.
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*/
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protected Map<Integer, Instance> instanceMap;
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/**
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* Construtor of AbstractMessageManager.
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*/
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public AbstractMessageManager(Map<Integer, Instance> instanceMap) {
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this.instanceMap = instanceMap;
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}
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/**
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* Find the next instance with smallest ID.
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*
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* @return The next instance.
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*/
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protected Instance findNextInstance(int currentId) {
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Instance result = null;
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var candidateList = instanceMap.keySet()
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.stream()
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.filter((i) -> i > currentId && instanceMap.get(i).isAlive())
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.sorted()
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.collect(Collectors.toList());
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if (candidateList.isEmpty()) {
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var index = instanceMap.keySet()
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.stream()
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.filter((i) -> instanceMap.get(i).isAlive())
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.sorted()
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.collect(Collectors.toList())
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.get(0);
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result = instanceMap.get(index);
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} else {
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var index = candidateList.get(0);
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result = instanceMap.get(index);
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}
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return result;
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}
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}
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