| /* |
| * 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.phoenix.schema.stats; |
| |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.util.List; |
| |
| import org.apache.hadoop.hbase.Cell; |
| import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment; |
| import org.apache.hadoop.hbase.regionserver.HRegion; |
| import org.apache.hadoop.hbase.regionserver.InternalScanner; |
| import org.apache.hadoop.hbase.regionserver.Store; |
| import org.apache.phoenix.hbase.index.util.ImmutableBytesPtr; |
| |
| /** |
| * Statistics tracker that helps to collect stats like min key, max key and guideposts. |
| */ |
| public interface StatisticsCollector extends Closeable { |
| |
| /** Constant used if no max timestamp is available */ |
| long NO_TIMESTAMP = -1; |
| |
| /** |
| * Returns the maximum timestamp of all cells encountered while collecting statistics. |
| */ |
| long getMaxTimeStamp(); |
| |
| /** |
| * Write the collected statistics for the given region. |
| */ |
| void updateStatistic(HRegion region); |
| |
| /** |
| * Collect statistics for the given list of cells. This method can be called multiple times |
| * during collection of statistics. |
| */ |
| void collectStatistics(List<Cell> results); |
| |
| /** |
| * Wrap a compaction scanner with a scanner that will collect statistics using this instance. |
| */ |
| InternalScanner createCompactionScanner(RegionCoprocessorEnvironment env, Store store, |
| InternalScanner delegate) throws IOException; |
| |
| /** |
| * Clear all statistics information that has been collected. |
| */ |
| void clear(); |
| |
| /** |
| * Retrieve the calculated guide post info for the given column family. |
| */ |
| GuidePostsInfo getGuidePosts(ImmutableBytesPtr fam); |
| } |