| /** |
| * 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.atlas.notification; |
| |
| /** |
| * Abstract notification consumer. |
| */ |
| public abstract class AbstractNotificationConsumer<T> implements NotificationConsumer<T> { |
| |
| /** |
| * Deserializer used to deserialize notification messages for this consumer. |
| */ |
| private final MessageDeserializer<T> deserializer; |
| |
| |
| // ----- Constructors ---------------------------------------------------- |
| |
| /** |
| * Construct an AbstractNotificationConsumer. |
| * |
| * @param deserializer the message deserializer used by this consumer |
| */ |
| public AbstractNotificationConsumer(MessageDeserializer<T> deserializer) { |
| this.deserializer = deserializer; |
| } |
| |
| |
| // ----- AbstractNotificationConsumer ------------------------------------- |
| |
| /** |
| * Get the next notification as a string. |
| * |
| * @return the next notification in string form |
| */ |
| protected abstract String getNext(); |
| |
| /** |
| * Get the next notification as a string without advancing. |
| * |
| * @return the next notification in string form |
| */ |
| protected abstract String peekMessage(); |
| |
| |
| // ----- NotificationConsumer --------------------------------------------- |
| |
| @Override |
| public T next() { |
| return deserializer.deserialize(getNext()); |
| } |
| |
| @Override |
| public T peek() { |
| return deserializer.deserialize(peekMessage()); |
| } |
| |
| public abstract void commit(); |
| } |