| /* |
| * 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.accumulo.core.clientImpl; |
| |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| import static org.apache.accumulo.core.clientImpl.Tables.qualified; |
| |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.accumulo.core.Constants; |
| import org.apache.accumulo.core.client.NamespaceNotFoundException; |
| import org.apache.accumulo.core.data.NamespaceId; |
| import org.apache.accumulo.core.data.TableId; |
| import org.apache.accumulo.fate.zookeeper.ZooCache; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.collect.ImmutableMap; |
| |
| /** |
| * Used for thread safe caching of immutable table ID maps. See ACCUMULO-4778. |
| */ |
| public class TableMap { |
| private static final Logger log = LoggerFactory.getLogger(TableMap.class); |
| |
| private final Map<String,TableId> tableNameToIdMap; |
| private final Map<TableId,String> tableIdToNameMap; |
| |
| private final ZooCache zooCache; |
| private final long updateCount; |
| |
| public TableMap(ClientContext context, ZooCache zooCache) { |
| |
| this.zooCache = zooCache; |
| // important to read this first |
| this.updateCount = zooCache.getUpdateCount(); |
| |
| List<String> tableIds = zooCache.getChildren(context.getZooKeeperRoot() + Constants.ZTABLES); |
| Map<NamespaceId,String> namespaceIdToNameMap = new HashMap<>(); |
| var tableNameToIdBuilder = ImmutableMap.<String,TableId>builder(); |
| var tableIdToNameBuilder = ImmutableMap.<TableId,String>builder(); |
| |
| // use StringBuilder to construct zPath string efficiently across many tables |
| StringBuilder zPathBuilder = new StringBuilder(); |
| zPathBuilder.append(context.getZooKeeperRoot()).append(Constants.ZTABLES).append("/"); |
| int prefixLength = zPathBuilder.length(); |
| |
| for (String tableIdStr : tableIds) { |
| // reset StringBuilder to prefix length before appending ID and suffix |
| zPathBuilder.setLength(prefixLength); |
| zPathBuilder.append(tableIdStr).append(Constants.ZTABLE_NAME); |
| byte[] tableName = zooCache.get(zPathBuilder.toString()); |
| zPathBuilder.setLength(prefixLength); |
| zPathBuilder.append(tableIdStr).append(Constants.ZTABLE_NAMESPACE); |
| byte[] nId = zooCache.get(zPathBuilder.toString()); |
| |
| String namespaceName = Namespace.DEFAULT.name(); |
| // create fully qualified table name |
| if (nId == null) { |
| namespaceName = null; |
| } else { |
| NamespaceId namespaceId = NamespaceId.of(new String(nId, UTF_8)); |
| if (!namespaceId.equals(Namespace.DEFAULT.id())) { |
| try { |
| namespaceName = namespaceIdToNameMap.get(namespaceId); |
| if (namespaceName == null) { |
| namespaceName = Namespaces.getNamespaceName(context, namespaceId); |
| namespaceIdToNameMap.put(namespaceId, namespaceName); |
| } |
| } catch (NamespaceNotFoundException e) { |
| log.error("Table (" + tableIdStr + ") contains reference to namespace (" + namespaceId |
| + ") that doesn't exist", e); |
| continue; |
| } |
| } |
| } |
| if (tableName != null && namespaceName != null) { |
| String tableNameStr = qualified(new String(tableName, UTF_8), namespaceName); |
| TableId tableId = TableId.of(tableIdStr); |
| tableNameToIdBuilder.put(tableNameStr, tableId); |
| tableIdToNameBuilder.put(tableId, tableNameStr); |
| } |
| } |
| tableNameToIdMap = tableNameToIdBuilder.build(); |
| tableIdToNameMap = tableIdToNameBuilder.build(); |
| } |
| |
| public Map<String,TableId> getNameToIdMap() { |
| return tableNameToIdMap; |
| } |
| |
| public Map<TableId,String> getIdtoNameMap() { |
| return tableIdToNameMap; |
| } |
| |
| public boolean isCurrent(ZooCache zc) { |
| return this.zooCache == zc && this.updateCount == zc.getUpdateCount(); |
| } |
| } |