| /* |
| 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, |
| 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 org.apache.edgent.connectors.pubsub.service; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.edgent.function.Consumer; |
| |
| class TopicHandler<T> implements Consumer<T> { |
| private static final long serialVersionUID = 1L; |
| |
| private final Class<T> streamType; |
| private final Set<Consumer<T>> subscribers = new HashSet<>(); |
| |
| TopicHandler(Class<T> streamType) { |
| this.streamType = streamType; |
| } |
| |
| synchronized void addSubscriber(Consumer<T> subscriber) { |
| subscribers.add(subscriber); |
| } |
| |
| synchronized void removeSubscriber(Consumer<?> subscriber) { |
| subscribers.remove(subscriber); |
| } |
| |
| @Override |
| public synchronized void accept(T tuple) { |
| for (Consumer<T> subscriber : subscribers) |
| subscriber.accept(tuple); |
| } |
| |
| void checkClass(Class<T> streamType) { |
| if (this.streamType != streamType) |
| throw new IllegalArgumentException(); |
| } |
| } |