org.apache.lens.server.session

Class SessionResource

java.lang.Object

org.apache.lens.server.session.SessionResource

public class SessionResource
extends Object

Session resource api

This provides api for all things in session.

Constructor Summary

Constructors

Constructor and Description
SessionResource() Instantiates a new session resource.

Method Summary

Methods

Modifier and Type	Method and Description
APIResult	addResource(LensSessionHandle sessionid, String type, String path) Add a resource to the session to all LensServices running in this Lens server
APIResult	closeSession(LensSessionHandle sessionid) Close a Lens server session.
APIResult	deleteResource(LensSessionHandle sessionid, String type, String path) Delete a resource from sesssion from all the @{link LensService}s running in this Lens server
String	getMessage() API to know if session service is up and running
StringList	getParams(LensSessionHandle sessionid, boolean verbose, String key) Get a list of key=value parameters set for this session.
StringList	listResources(LensSessionHandle sessionid, String type) Lists resources from the session for a given resource type.
LensSessionHandle	openSession(String username, String password, String database, LensConf sessionconf) Create a new session with Lens server.
APIResult	setParam(LensSessionHandle sessionid, String key, String value) Set value for a parameter specified by key

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SessionResource

public SessionResource()
                throws LensException

Instantiates a new session resource.

Throws:

LensException - the lens exception

Method Detail

getMessage

public String getMessage()

API to know if session service is up and running

Returns:

Simple text saying it up

openSession

public LensSessionHandle openSession(String username,
                            String password,
                            String database,
                            LensConf sessionconf)

Create a new session with Lens server.

Parameters:

username - User name of the Lens server user

password - Password of the Lens server user

database - Set current database to the supplied value, if provided

sessionconf - Key-value properties which will be used to configure this session

Returns:

A Session handle unique to this session

closeSession

public APIResult closeSession(LensSessionHandle sessionid)

Close a Lens server session.

Parameters:

sessionid - Session handle object of the session to be closed

Returns:

APIResult object indicating if the operation was successful (check result.getStatus())

addResource

public APIResult addResource(LensSessionHandle sessionid,
                    String type,
                    String path)

Add a resource to the session to all LensServices running in this Lens server

The returned @{link APIResult} will have status SUCCEEDED only if the add operation was successful for all services running in this Lens server.

Parameters:

sessionid - session handle object

type - The type of resource. Valid types are 'jar', 'file' and 'archive'

path - path of the resource

Returns:

APIResult with state APIResult.Status.SUCCEEDED, if add was successful. APIResult with state APIResult.Status.PARTIAL, if add succeeded only for some services. APIResult with state APIResult.Status.FAILED, if add has failed

listResources

public StringList listResources(LensSessionHandle sessionid,
                       String type)

Lists resources from the session for a given resource type.

Parameters:

sessionid - session handle object

type - resource type. It can be jar, file or null

Returns:

Lists all resources for a given resource type Lists all resources if the resource type is not specified

deleteResource

public APIResult deleteResource(LensSessionHandle sessionid,
                       String type,
                       String path)

Delete a resource from sesssion from all the @{link LensService}s running in this Lens server

Similar to addResource, this call is successful only if resource was deleted from all services.

Parameters:

sessionid - session handle object

type - The type of resource. Valid types are 'jar', 'file' and 'archive'

path - path of the resource to be deleted

Returns:

APIResult with state APIResult.Status.SUCCEEDED, if delete was successful. APIResult with state APIResult.Status.PARTIAL, if delete succeeded only for some services. APIResult with state APIResult.Status.FAILED, if delete has failed

getParams

public StringList getParams(LensSessionHandle sessionid,
                   boolean verbose,
                   String key)

Get a list of key=value parameters set for this session.

Parameters:

sessionid - session handle object

verbose - If true, all the parameters will be returned. If false, configuration parameters will be returned

key - if this is empty, output will contain all parameters and their values, if it is non empty parameters will be filtered by key

Returns:

List of Strings, one entry per key-value pair

setParam

public APIResult setParam(LensSessionHandle sessionid,
                 String key,
                 String value)

Set value for a parameter specified by key

The parameters can be a hive variable or a configuration. To set key as a hive variable, the key should be prefixed with 'hivevar:'. To set key as configuration parameter, the key should be prefixed with 'hiveconf:' If no prefix is attached, the parameter is set as configuration.

Parameters:

sessionid - session handle object

key - parameter key

value - parameter value

Returns:

APIResult object indicating if set operation was successful