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..
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