| /* |
| * 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.client.impl; |
| |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| |
| import java.util.ArrayList; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map.Entry; |
| import java.util.SortedMap; |
| import java.util.TreeMap; |
| import java.util.function.BiConsumer; |
| |
| import org.apache.accumulo.core.Constants; |
| import org.apache.accumulo.core.client.NamespaceNotFoundException; |
| import org.apache.accumulo.core.util.Validator; |
| import org.apache.accumulo.fate.zookeeper.ZooCache; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class Namespaces { |
| private static final Logger log = LoggerFactory.getLogger(Namespaces.class); |
| |
| public static final String VALID_NAME_REGEX = "^\\w*$"; |
| public static final Validator<String> VALID_NAME = new Validator<String>() { |
| @Override |
| public boolean test(String namespace) { |
| return namespace != null && namespace.matches(VALID_NAME_REGEX); |
| } |
| |
| @Override |
| public String invalidMessage(String namespace) { |
| if (namespace == null) |
| return "Namespace cannot be null"; |
| return "Namespaces must only contain word characters (letters, digits, and underscores): " |
| + namespace; |
| } |
| }; |
| |
| public static final Validator<String> NOT_DEFAULT = new Validator<String>() { |
| @Override |
| public boolean test(String namespace) { |
| return !Namespace.DEFAULT.equals(namespace); |
| } |
| |
| @Override |
| public String invalidMessage(String namespace) { |
| return "Namespace cannot be the reserved empty namespace"; |
| } |
| }; |
| |
| public static final Validator<String> NOT_ACCUMULO = new Validator<String>() { |
| @Override |
| public boolean test(String namespace) { |
| return !Namespace.ACCUMULO.equals(namespace); |
| } |
| |
| @Override |
| public String invalidMessage(String namespace) { |
| return "Namespace cannot be the reserved namespace, " + Namespace.ACCUMULO; |
| } |
| }; |
| |
| public static boolean exists(ClientContext context, Namespace.ID namespaceId) { |
| ZooCache zc = context.getZooCache(); |
| List<String> namespaceIds = zc.getChildren(context.getZooKeeperRoot() + Constants.ZNAMESPACES); |
| return namespaceIds.contains(namespaceId.canonicalID()); |
| } |
| |
| public static List<Table.ID> getTableIds(ClientContext context, Namespace.ID namespaceId) |
| throws NamespaceNotFoundException { |
| String namespace = getNamespaceName(context, namespaceId); |
| List<Table.ID> tableIds = new LinkedList<>(); |
| for (Entry<String,Table.ID> nameToId : Tables.getNameToIdMap(context).entrySet()) |
| if (namespace.equals(Tables.qualify(nameToId.getKey()).getFirst())) |
| tableIds.add(nameToId.getValue()); |
| return tableIds; |
| } |
| |
| public static List<String> getTableNames(ClientContext context, Namespace.ID namespaceId) |
| throws NamespaceNotFoundException { |
| String namespace = getNamespaceName(context, namespaceId); |
| List<String> names = new LinkedList<>(); |
| for (String name : Tables.getNameToIdMap(context).keySet()) |
| if (namespace.equals(Tables.qualify(name).getFirst())) |
| names.add(name); |
| return names; |
| } |
| |
| /** |
| * Gets all the namespaces from ZK. The first arg (t) the BiConsumer accepts is the ID and the |
| * second (u) is the namespaceName. |
| */ |
| private static void getAllNamespaces(ClientContext context, |
| BiConsumer<String,String> biConsumer) { |
| final ZooCache zc = context.getZooCache(); |
| List<String> namespaceIds = zc.getChildren(context.getZooKeeperRoot() + Constants.ZNAMESPACES); |
| for (String id : namespaceIds) { |
| byte[] path = zc.get(context.getZooKeeperRoot() + Constants.ZNAMESPACES + "/" + id |
| + Constants.ZNAMESPACE_NAME); |
| if (path != null) { |
| biConsumer.accept(id, new String(path, UTF_8)); |
| } |
| } |
| } |
| |
| /** |
| * Return sorted map with key = ID, value = namespaceName |
| */ |
| public static SortedMap<Namespace.ID,String> getIdToNameMap(ClientContext context) { |
| SortedMap<Namespace.ID,String> idMap = new TreeMap<>(); |
| getAllNamespaces(context, (id, name) -> idMap.put(Namespace.ID.of(id), name)); |
| return idMap; |
| } |
| |
| /** |
| * Return sorted map with key = namespaceName, value = ID |
| */ |
| public static SortedMap<String,Namespace.ID> getNameToIdMap(ClientContext context) { |
| SortedMap<String,Namespace.ID> nameMap = new TreeMap<>(); |
| getAllNamespaces(context, (id, name) -> nameMap.put(name, Namespace.ID.of(id))); |
| return nameMap; |
| } |
| |
| /** |
| * Look for namespace ID in ZK. Throw NamespaceNotFoundException if not found. |
| */ |
| public static Namespace.ID getNamespaceId(ClientContext context, String namespaceName) |
| throws NamespaceNotFoundException { |
| final ArrayList<Namespace.ID> singleId = new ArrayList<>(1); |
| getAllNamespaces(context, (id, name) -> { |
| if (name.equals(namespaceName)) |
| singleId.add(Namespace.ID.of(id)); |
| }); |
| if (singleId.isEmpty()) |
| throw new NamespaceNotFoundException(null, namespaceName, |
| "getNamespaceId() failed to find namespace"); |
| return singleId.get(0); |
| } |
| |
| /** |
| * Look for namespace ID in ZK. Fail quietly by logging and returning null. |
| */ |
| public static Namespace.ID lookupNamespaceId(ClientContext context, String namespaceName) { |
| Namespace.ID id = null; |
| try { |
| id = getNamespaceId(context, namespaceName); |
| } catch (NamespaceNotFoundException e) { |
| if (log.isDebugEnabled()) |
| log.debug("Failed to find namespace ID from name: " + namespaceName, e); |
| } |
| return id; |
| } |
| |
| /** |
| * Return true if namespace name exists |
| */ |
| public static boolean namespaceNameExists(ClientContext context, String namespaceName) { |
| return lookupNamespaceId(context, namespaceName) != null; |
| } |
| |
| /** |
| * Look for namespace name in ZK. Throw NamespaceNotFoundException if not found. |
| */ |
| public static String getNamespaceName(ClientContext context, Namespace.ID namespaceId) |
| throws NamespaceNotFoundException { |
| String name; |
| ZooCache zc = context.getZooCache(); |
| byte[] path = zc.get(context.getZooKeeperRoot() + Constants.ZNAMESPACES + "/" |
| + namespaceId.canonicalID() + Constants.ZNAMESPACE_NAME); |
| if (path != null) |
| name = new String(path, UTF_8); |
| else |
| throw new NamespaceNotFoundException(namespaceId.canonicalID(), null, |
| "getNamespaceName() failed to find namespace"); |
| return name; |
| } |
| |
| } |