accumulo-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From joshelser <...@git.apache.org>
Subject [GitHub] accumulo pull request #279: ACCUMULO-3238 Table.ID Namespace.ID Refactor
Date Tue, 11 Jul 2017 16:35:38 GMT
Github user joshelser commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/279#discussion_r126742200
  
    --- Diff: core/src/main/java/org/apache/accumulo/core/client/impl/Namespaces.java ---
    @@ -100,50 +106,150 @@ private static ZooCache getZooCache(Instance instance) {
         return namespaceMap;
       }
     
    -  public static boolean exists(Instance instance, String namespaceId) {
    +  public static boolean exists(Instance instance, Namespace.ID namespaceId) {
         ZooCache zc = getZooCache(instance);
         List<String> namespaceIds = zc.getChildren(ZooUtil.getRoot(instance) + Constants.ZNAMESPACES);
    -    return namespaceIds.contains(namespaceId);
    -  }
    -
    -  public static String getNamespaceId(Instance instance, String namespace) throws NamespaceNotFoundException
{
    -    String id = getNameToIdMap(instance).get(namespace);
    -    if (id == null)
    -      throw new NamespaceNotFoundException(null, namespace, "getNamespaceId() failed
to find namespace");
    -    return id;
    +    return namespaceIds.contains(namespaceId.canonicalID());
       }
     
    +  /**
    +   * @deprecated Do not use - String for namespace ID is not type safe. Use {@link #getNamespaceName(Instance,
Namespace.ID)}
    +   */
    +  @Deprecated
       public static String getNamespaceName(Instance instance, String namespaceId) throws
NamespaceNotFoundException {
         String namespaceName = getIdToNameMap(instance).get(namespaceId);
         if (namespaceName == null)
           throw new NamespaceNotFoundException(namespaceId, null, "getNamespaceName() failed
to find namespace");
         return namespaceName;
       }
     
    +  /**
    +   * @deprecated Do not use - Not type safe, ambiguous String-String map. Use {@link
#getNameMap(Instance)}
    +   */
    +  @Deprecated
       public static SortedMap<String,String> getNameToIdMap(Instance instance) {
         return getMap(instance, true);
       }
     
    +  /**
    +   * @deprecated Do not use - Not type safe, ambiguous String-String map. Use {@link
#getIdMap(Instance)}
    +   */
    +  @Deprecated
       public static SortedMap<String,String> getIdToNameMap(Instance instance) {
         return getMap(instance, false);
       }
     
    -  public static List<String> getTableIds(Instance instance, String namespaceId)
throws NamespaceNotFoundException {
    +  public static List<Table.ID> getTableIds(Instance instance, Namespace.ID namespaceId)
throws NamespaceNotFoundException {
         String namespace = getNamespaceName(instance, namespaceId);
    -    List<String> names = new LinkedList<>();
    -    for (Entry<String,String> nameToId : Tables.getNameToIdMap(instance).entrySet())
    +    List<Table.ID> tableIds = new LinkedList<>();
    +    for (Entry<String,Table.ID> nameToId : Tables.getNameMap(instance).entrySet())
           if (namespace.equals(Tables.qualify(nameToId.getKey()).getFirst()))
    -        names.add(nameToId.getValue());
    -    return names;
    +        tableIds.add(nameToId.getValue());
    +    return tableIds;
       }
     
    -  public static List<String> getTableNames(Instance instance, String namespaceId)
throws NamespaceNotFoundException {
    +  public static List<String> getTableNames(Instance instance, Namespace.ID namespaceId)
throws NamespaceNotFoundException {
         String namespace = getNamespaceName(instance, namespaceId);
         List<String> names = new LinkedList<>();
    -    for (String name : Tables.getNameToIdMap(instance).keySet())
    +    for (String name : Tables.getNameMap(instance).keySet())
           if (namespace.equals(Tables.qualify(name).getFirst()))
             names.add(name);
         return names;
       }
     
    +  /**
    +   * Populate map passed in as the BiConsumer. key = ID, value = namespaceName
    +   */
    +  private static void populateMap(Instance instance, BiConsumer<String,String>
biConsumer) {
    +    final ZooCache zc = getZooCache(instance);
    +    List<String> namespaceIds = zc.getChildren(ZooUtil.getRoot(instance) + Constants.ZNAMESPACES);
    +    for (String id : namespaceIds) {
    +      byte[] path = zc.get(ZooUtil.getRoot(instance) + 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> getIdMap(Instance instance) {
    +    SortedMap<Namespace.ID,String> idMap = new TreeMap<>();
    +    populateMap(instance, (id, name) -> idMap.put(new Namespace.ID(id), name));
    +    return idMap;
    +  }
    +
    +  /**
    +   * Return sorted map with key = namespaceName, value = ID
    +   */
    +  public static SortedMap<String,Namespace.ID> getNameMap(Instance instance) {
    +    SortedMap<String,Namespace.ID> nameMap = new TreeMap<>();
    +    populateMap(instance, (id, name) -> nameMap.put(name, new Namespace.ID(id)));
    +    return nameMap;
    +  }
    +
    +  /**
    +   * Look for namespace ID in ZK. Throw NamespaceNotFoundException if not found.
    +   */
    +  public static Namespace.ID getNamespaceId(Instance instance, String namespaceName)
throws NamespaceNotFoundException {
    +    final ArrayList<Namespace.ID> singleId = new ArrayList<>(1);
    +    populateMap(instance, (id, name) -> {
    +      if (name.equals(namespaceName))
    +        singleId.add(new Namespace.ID(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(Instance instance, String namespaceName)
{
    +    Namespace.ID id = null;
    +    try {
    +      id = getNamespaceId(instance, 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(Instance instance, String namespaceName)
{
    +    return lookupNamespaceId(instance, namespaceName) != null;
    +  }
    +
    +  /**
    +   * Look for namespace name in ZK. Throw NamespaceNotFoundException if not found.
    +   */
    +  public static String getNamespaceName(Instance instance, Namespace.ID namespaceId)
throws NamespaceNotFoundException {
    +    final ArrayList<String> singleName = new ArrayList<>(1);
    +    populateMap(instance, (id, name) -> {
    --- End diff --
    
    Why iterate over every namespace to just find a single one? Creating a new List also seems
unnecessary to just find the namespace from an ID..


---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---

Mime
View raw message