| /** |
| * 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.metron.hbase; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hbase.TableName; |
| import org.apache.hadoop.hbase.client.Connection; |
| import org.apache.hadoop.hbase.client.ConnectionFactory; |
| import org.apache.hadoop.hbase.client.Table; |
| |
| public class HTableProvider implements TableProvider { |
| |
| private static class RetryingConnection { |
| |
| private Configuration config; |
| private Connection conn; |
| |
| RetryingConnection(Configuration config) { |
| this.config = config; |
| } |
| |
| public Connection getUnderlying() throws IOException { |
| if (conn == null || conn.isClosed()) { |
| conn = ConnectionFactory.createConnection(config); |
| } |
| return conn; |
| } |
| } |
| |
| /** |
| * We have to handle serialization issues with Storm via indirections. Rather than re-implement |
| * the interface everywhere we touch HBase, we can use a lazy initialization scheme to encapsulate |
| * this within the HTableProvider. This is a sort of poor man's connection pool. |
| */ |
| private static Map<Configuration, ThreadLocal<RetryingConnection>> connMap = new ConcurrentHashMap<>(); |
| |
| @Override |
| public Table getTable(Configuration config, String tableName) |
| throws IOException { |
| return getConnection(config).getTable(TableName.valueOf(tableName)); |
| } |
| |
| private Connection getConnection(Configuration config) throws IOException { |
| ThreadLocal<RetryingConnection> threadLocal = connMap.computeIfAbsent(config, c -> ThreadLocal.withInitial(() -> new RetryingConnection(config))); |
| return threadLocal.get().getUnderlying(); |
| } |
| |
| } |