me.prettyprint.cassandra.connection.client
Interface HClient

All Known Implementing Classes:

HKerberosThriftClient, HThriftClient

public interface HClient

Hector Client Interface.

Author:

patricioe (Patricio Echague - patricio@datastax.com)

Method Summary

void	clearAuthentication() Clears current authentication
HClient	close() Close this client and its underlying connection.
org.apache.cassandra.thrift.Cassandra.Client	getCassandra() Returns a new Cassandra.Client on each invocation using the underlying transport.
org.apache.cassandra.thrift.Cassandra.Client	getCassandra(String keyspaceNameArg) Returns a new Cassandra.Client on each invocation using the underlying transport.
CassandraHost	getCassandraHost() Retrieves the CassandraHost associate to this client.
long	getSinceLastUsed() Retrieves the time in milliseconds since this client was used last time.
boolean	isAlreadyAuthenticated(Map<String,String> credentials) Retrieves whether client has been authenticated with the given credentials.
boolean	isOpen() Retrieves whether the underlying connection for this client is open or not.
HClient	open() Open a connection for this client.
void	setAuthenticated(Map<String,String> credentials) Sets authentication credentials to the client.
void	startToUse() Start tracking the beginning of use for this client.

Method Detail

getCassandra

org.apache.cassandra.thrift.Cassandra.Client getCassandra()

Returns a new Cassandra.Client on each invocation using the underlying transport.

Returns:

Cassandra.Client from the underlying transport

Throws:

IllegalStateException - if it is called on a closed client

getCassandra

org.apache.cassandra.thrift.Cassandra.Client getCassandra(String keyspaceNameArg)

Returns a new Cassandra.Client on each invocation using the underlying transport.

Parameters:

keyspaceNameArg - a keyspace

Returns:

Cassandra.Client from the underlying transport

Throws:

IllegalStateException - if it is called on a closed client

HInvalidRequestException - if the keyspace does not exist or if it is malformed

HectorTransportException - if any other error occurs

close

HClient close()

Close this client and its underlying connection.

Returns:

this object

open

HClient open()

Open a connection for this client.

Returns:

this object

Throws:

IllegalStateException - if this method is called from a client with an open connection

HectorTransportException - if the connection cannot be established

isOpen

boolean isOpen()

Retrieves whether the underlying connection for this client is open or not.

Returns:

TRUE if the underlying connection for this client is open. FALSE otherwise

startToUse

void startToUse()

Start tracking the beginning of use for this client. This is expected to be called per operation basis. Followed by a getSinceLastUsed()

getSinceLastUsed

long getSinceLastUsed()

Retrieves the time in milliseconds since this client was used last time.

Returns:

time in milliseconds since last used.

getCassandraHost

CassandraHost getCassandraHost()

Retrieves the CassandraHost associate to this client.

Returns:

the @link CassandraHost object for this client

setAuthenticated

void setAuthenticated(Map<String,String> credentials)

Sets authentication credentials to the client.

Parameters:

credentials - credentials to be set.

isAlreadyAuthenticated

boolean isAlreadyAuthenticated(Map<String,String> credentials)

Retrieves whether client has been authenticated with the given credentials.

Parameters:

credentials - authentication credentials

Returns:

TRUE if the client has previously been authenticated using the credentials, FALSE otherwise (wrong credentials or not authenticated)

clearAuthentication

void clearAuthentication()

Clears current authentication