com.hazelcast.core.MemberSelector Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2013, 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;
/**
* Implementations of this interface are thought to select members
* that are capable of executing a special kind of task.
* The {@link #select(Member)} method is called for every available
* member in the cluster and it's up to the implementation to decide
* if the member is going to be used or not.
* A basic implementation for example could select members on
* existence of a special attribute in the members like the following
* example show:
*
public class MyMemberSelector implements MemberSelector {
* public boolean select(Member member) {
* return Boolean.TRUE.equals(member.getAttribute("my.special.executor"));
* }
* }
*
*/
public interface MemberSelector {
/**
* Decides for the given member to be part of an operation or not.
*
* @param member the member instance to decide on
* @return true of member should take part in the operation otherwise false
*/
boolean select(Member member);
}