001/* 002 * (C) Copyright 2016 Nuxeo SA (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 */ 017package org.nuxeo.lib.stream.pattern.consumer; 018 019import org.nuxeo.lib.stream.pattern.Message; 020 021/** 022 * A consumer consumes {@link Message} by batch. 023 * 024 * @since 9.1 025 */ 026public interface Consumer<M extends Message> extends AutoCloseable { 027 028 /** 029 * Begin a batch of messages. 030 */ 031 void begin(); 032 033 /** 034 * Consume a message. 035 */ 036 void accept(M message); 037 038 /** 039 * End of the batch message. 040 */ 041 void commit(); 042 043 /** 044 * Called when there is an exception during {@link #accept(Message)} or {@link #commit()}. 045 */ 046 void rollback(); 047 048}