| /* |
| * 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.druid.segment; |
| |
| import org.apache.druid.query.DataSource; |
| import org.joda.time.Interval; |
| |
| /** |
| * Utility for creating {@link Segment} objects for concrete datasources. |
| * |
| * @see org.apache.druid.guice.DruidBinders#segmentWranglerBinder to register factories |
| */ |
| public interface SegmentWrangler |
| { |
| /** |
| * Gets Segments for a particular datasource and set of intervals. These are expected to exist for any datasource |
| * where {@link DataSource#isConcrete} and {@link DataSource#isGlobal} are both true (corresponding to datasources |
| * where any Druid server could scan its data). |
| * |
| * Note: there are no SegmentWranglers for 'table' datasources (Druid's distributed datasources) because those are |
| * special and handled in their own special way. |
| * |
| * @return Segments that, collectively, contain data for dataSource. May be empty if dataSource does not exist or |
| * has no data in the provided intervals. May contain data outside the provided intervals, so callers should |
| * filter it down further, e.g. through the "interval" parameter of {@link StorageAdapter#makeCursors} |
| */ |
| Iterable<Segment> getSegmentsForIntervals(DataSource dataSource, Iterable<Interval> intervals); |
| } |