74 lines
2.2 KiB
Java
74 lines
2.2 KiB
Java
/**
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* The MIT License
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* Copyright (c) 2014-2016 Ilkka Seppälä
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* <p>
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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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* <p>
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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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* <p>
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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.databus;
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import java.util.HashSet;
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import java.util.Set;
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/**
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* The Data-Bus implementation.
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*
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* <p>This implementation uses a Singleton.</p>
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*
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* @author Paul Campbell (pcampbell@kemitix.net)
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*/
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public class DataBus {
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private static final DataBus INSTANCE = new DataBus();
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private final Set<Member> listeners = new HashSet<>();
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public static DataBus getInstance() {
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return INSTANCE;
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}
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/**
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* Register a member with the data-bus to start receiving events.
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*
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* @param member The member to register
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*/
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public void subscribe(final Member member) {
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this.listeners.add(member);
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}
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/**
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* Deregister a member to stop receiving events.
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*
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* @param member The member to deregister
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*/
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public void unsubscribe(final Member member) {
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this.listeners.remove(member);
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}
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/**
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* Publish and event to all members.
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*
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* @param event The event
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*/
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public void publish(final DataType event) {
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event.setDataBus(this);
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listeners.forEach(listener -> listener.accept(event));
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}
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}
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