/*
* Copyright (c) 2008-2017, Hazelcast, Inc. 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 com.hazelcast.core;
/**
* <p>Implementations of this interface select members
* that are capable of executing a special kind of task.<br/>
* The {@link #select(Member)} method is called for every available
* member in the cluster and it is up to the implementation to decide
* if the member is going to be used or not.</p>
* <p>For example, a basic implementation could select members on the
* existence of a special attribute in the members, like the following
* example:<br/>
* <pre>public class MyMemberSelector implements MemberSelector {
* public boolean select(Member member) {
* return Boolean.TRUE.equals(member.getAttribute("my.special.executor"));
* }
* }</pre>
* </p>
*/
public interface MemberSelector {
/**
* Decides if the given member will be part of an operation or not.
*
* @param member the member instance to decide upon
* @return true if the member should take part in the operation, false otherwise
*/
boolean select(Member member);
}