| /* |
| * 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.hadoop.hbase.spark.datasources |
| |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.apache.hadoop.hbase.TableName |
| import org.apache.hadoop.hbase.client._ |
| import org.apache.hadoop.hbase.spark.{HBaseConnectionKey, SmartConnection, |
| HBaseConnectionCache, HBaseRelation} |
| import scala.language.implicitConversions |
| |
| // Resource and ReferencedResources are defined for extensibility, |
| // e.g., consolidate scan and bulkGet in the future work. |
| |
| // User has to invoke release explicitly to release the resource, |
| // and potentially parent resources |
| @InterfaceAudience.Private |
| trait Resource { |
| def release(): Unit |
| } |
| |
| @InterfaceAudience.Private |
| case class ScanResource(tbr: TableResource, rs: ResultScanner) extends Resource { |
| def release() { |
| rs.close() |
| tbr.release() |
| } |
| } |
| |
| @InterfaceAudience.Private |
| case class GetResource(tbr: TableResource, rs: Array[Result]) extends Resource { |
| def release() { |
| tbr.release() |
| } |
| } |
| |
| @InterfaceAudience.Private |
| trait ReferencedResource { |
| var count: Int = 0 |
| def init(): Unit |
| def destroy(): Unit |
| def acquire() = synchronized { |
| try { |
| count += 1 |
| if (count == 1) { |
| init() |
| } |
| } catch { |
| case e: Throwable => |
| release() |
| throw e |
| } |
| } |
| |
| def release() = synchronized { |
| count -= 1 |
| if (count == 0) { |
| destroy() |
| } |
| } |
| |
| def releaseOnException[T](func: => T): T = { |
| acquire() |
| val ret = { |
| try { |
| func |
| } catch { |
| case e: Throwable => |
| release() |
| throw e |
| } |
| } |
| ret |
| } |
| } |
| |
| @InterfaceAudience.Private |
| case class TableResource(relation: HBaseRelation) extends ReferencedResource { |
| var connection: SmartConnection = _ |
| var table: Table = _ |
| |
| override def init(): Unit = { |
| connection = HBaseConnectionCache.getConnection(relation.hbaseConf) |
| table = connection.getTable(TableName.valueOf(relation.tableName)) |
| } |
| |
| override def destroy(): Unit = { |
| if (table != null) { |
| table.close() |
| table = null |
| } |
| if (connection != null) { |
| connection.close() |
| connection = null |
| } |
| } |
| |
| def getScanner(scan: Scan): ScanResource = releaseOnException { |
| ScanResource(this, table.getScanner(scan)) |
| } |
| |
| def get(list: java.util.List[org.apache.hadoop.hbase.client.Get]) = releaseOnException { |
| GetResource(this, table.get(list)) |
| } |
| } |
| |
| @InterfaceAudience.Private |
| case class RegionResource(relation: HBaseRelation) extends ReferencedResource { |
| var connection: SmartConnection = _ |
| var rl: RegionLocator = _ |
| val regions = releaseOnException { |
| val keys = rl.getStartEndKeys |
| keys.getFirst.zip(keys.getSecond) |
| .zipWithIndex |
| .map(x => |
| HBaseRegion(x._2, |
| Some(x._1._1), |
| Some(x._1._2), |
| Some(rl.getRegionLocation(x._1._1).getHostname))) |
| } |
| |
| override def init(): Unit = { |
| connection = HBaseConnectionCache.getConnection(relation.hbaseConf) |
| rl = connection.getRegionLocator(TableName.valueOf(relation.tableName)) |
| } |
| |
| override def destroy(): Unit = { |
| if (rl != null) { |
| rl.close() |
| rl = null |
| } |
| if (connection != null) { |
| connection.close() |
| connection = null |
| } |
| } |
| } |
| |
| @InterfaceAudience.Private |
| object HBaseResources{ |
| implicit def ScanResToScan(sr: ScanResource): ResultScanner = { |
| sr.rs |
| } |
| |
| implicit def GetResToResult(gr: GetResource): Array[Result] = { |
| gr.rs |
| } |
| |
| implicit def TableResToTable(tr: TableResource): Table = { |
| tr.table |
| } |
| |
| implicit def RegionResToRegions(rr: RegionResource): Seq[HBaseRegion] = { |
| rr.regions |
| } |
| } |