org.apache.hadoop.registry.client.api
Interface RegistryOperations

All Superinterfaces:

Closeable, Service

All Known Implementing Classes:

RegistryOperationsClient, RegistryOperationsService

@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface RegistryOperations
extends Service

Registry Operations

Method Summary

boolean	addWriteAccessor(String id, String pass) Add a new write access entry to be added to node permissions in all future write operations of a session connected to a secure registry.
void	bind(String path, ServiceRecord record, int flags) Bind a path in the registry to a service record
void	clearWriteAccessors() Clear all write accessors.
void	delete(String path, boolean recursive) Delete a path.
boolean	exists(String path) Probe for a path existing.
List<String>	list(String path) List all entries under a registry path, returning the relative names of the entries.
boolean	mknode(String path, boolean createParents) Create a path.
ServiceRecord	resolve(String path) Resolve the record at a path
RegistryPathStatus	stat(String path) Get the status of a path

Methods inherited from interface org.apache.hadoop.service.Service

close, getBlockers, getConfig, getFailureCause, getFailureState, getLifecycleHistory, getName, getServiceState, getStartTime, init, isInState, registerServiceListener, start, stop, unregisterServiceListener, waitForServiceToStop

Method Detail

mknode

boolean mknode(String path,
               boolean createParents)
               throws org.apache.hadoop.fs.PathNotFoundException,
                      InvalidPathnameException,
                      IOException

Create a path. It is not an error if the path exists already, be it empty or not. The createParents flag also requests creating the parents. As entries in the registry can hold data while still having child entries, it is not an error if any of the parent path elements have service records.

Parameters:

path - path to create

createParents - also create the parents.

Returns:

true if the path was created, false if it existed.

Throws:

org.apache.hadoop.fs.PathNotFoundException - parent path is not in the registry.

InvalidPathnameException - path name is invalid.

IOException - Any other IO Exception.

bind

void bind(String path,
          ServiceRecord record,
          int flags)
          throws org.apache.hadoop.fs.PathNotFoundException,
                 FileAlreadyExistsException,
                 InvalidPathnameException,
                 IOException

Bind a path in the registry to a service record

Parameters:

path - path to service record

record - service record service record to create/update

flags - bind flags

Throws:

org.apache.hadoop.fs.PathNotFoundException - the parent path does not exist

FileAlreadyExistsException - path exists but create flags do not include "overwrite"

InvalidPathnameException - path name is invalid.

IOException - Any other IO Exception.

resolve

ServiceRecord resolve(String path)
                      throws org.apache.hadoop.fs.PathNotFoundException,
                             NoRecordException,
                             InvalidRecordException,
                             IOException

Resolve the record at a path

Parameters:

path - path to an entry containing a ServiceRecord

Returns:

the record

Throws:

org.apache.hadoop.fs.PathNotFoundException - path is not in the registry.

NoRecordException - if there is not a service record

InvalidRecordException - if there was a service record but it could not be parsed.

IOException - Any other IO Exception

stat

RegistryPathStatus stat(String path)
                        throws org.apache.hadoop.fs.PathNotFoundException,
                               InvalidPathnameException,
                               IOException

Get the status of a path

Parameters:

path - path to query

Returns:

the status of the path

Throws:

org.apache.hadoop.fs.PathNotFoundException - path is not in the registry.

InvalidPathnameException - the path is invalid.

IOException - Any other IO Exception

exists

boolean exists(String path)
               throws IOException

Probe for a path existing. This is equivalent to stat(String) with any failure downgraded to a

Parameters:

path - path to query

Returns:

true if the path was found

Throws:

IOException

list

List<String> list(String path)
                  throws org.apache.hadoop.fs.PathNotFoundException,
                         InvalidPathnameException,
                         IOException

List all entries under a registry path, returning the relative names of the entries.

Parameters:

path - path to query

Returns:

a possibly empty list of the short path names of child entries.

Throws:

org.apache.hadoop.fs.PathNotFoundException

InvalidPathnameException

IOException

delete

void delete(String path,
            boolean recursive)
            throws org.apache.hadoop.fs.PathNotFoundException,
                   org.apache.hadoop.fs.PathIsNotEmptyDirectoryException,
                   InvalidPathnameException,
                   IOException

Delete a path. If the operation returns without an error then the entry has been deleted.

Parameters:

path - path delete recursively

recursive - recursive flag

Throws:

org.apache.hadoop.fs.PathNotFoundException - path is not in the registry.

InvalidPathnameException - the path is invalid.

org.apache.hadoop.fs.PathIsNotEmptyDirectoryException - path has child entries, but recursive is false.

IOException - Any other IO Exception

addWriteAccessor

boolean addWriteAccessor(String id,
                         String pass)
                         throws IOException

Add a new write access entry to be added to node permissions in all future write operations of a session connected to a secure registry. This does not grant the session any more rights: if it lacked any write access, it will still be unable to manipulate the registry. In an insecure cluster, this operation has no effect.

Parameters:

id - ID to use

pass - password

Returns:

true if the accessor was added: that is, the registry connection uses permissions to manage access

Throws:

IOException - on any failure to build the digest

clearWriteAccessors

void clearWriteAccessors()

Clear all write accessors. At this point all standard permissions/ACLs are retained, including any set on behalf of the user Only accessors added via addWriteAccessor(String, String) are removed.