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.ecm.platform.importer.mqueues.pattern.producer; 018 019import org.nuxeo.ecm.platform.importer.mqueues.pattern.Message; 020 021import java.util.Iterator; 022 023/** 024 * A ProducerIterator returns {@link Message}. 025 * 026 * It also has the logic to return a partition index, that will be used to run concurrent consumers. 027 * 028 * @since 9.1 029 */ 030public interface ProducerIterator<M extends Message> extends Iterator<M>, AutoCloseable { 031 032 /** 033 * The remove method is not needed. 034 */ 035 @Override 036 default void remove() { 037 throw new UnsupportedOperationException(); 038 } 039 040 /** 041 * Returns a partition associated with the {@link Message}. 042 * 043 * The value returned must be between 0 and lower than partitions. 044 * 045 * @param message the message to shard 046 * @param partitions the number of partitions 047 */ 048 int getPartition(M message, int partitions); 049 050 051} 052