io.hetu.core.plugin.datacenter.client

Class DataCenterClient

java.lang.Object

io.hetu.core.plugin.datacenter.client.DataCenterClient

public class DataCenterClient
extends Object

Data center client, it is for get help data center plugin to get the metadata and issue query.

Since:

2020-02-11

Field Summary

Fields

Modifier and Type	Field and Description
static DateTimeFormatter	DATE_FORMATTER

Constructor Summary

Constructors

Constructor and Description
DataCenterClient(DataCenterConfig config, okhttp3.OkHttpClient httpClient, TypeManager typeManager) Constructor of data center client.

Method Summary

Modifier and Type	Method and Description
Set<String>	getCatalogNames() Get catalogs from the remote data center.
List<DataCenterColumn>	getColumns(String sql) Get the columns information of this sql.
Set<String>	getSchemaNames(String catalog) Get schema names from the given catalog
int	getSplits(String globalQueryId) Get the split count form the server.
DataCenterTable	getTable(String catalog, String schema, String tableName) Get table metadata.
Set<String>	getTableNames(String catalog, String schema) Get table names from the remote data center.
TableStatistics	getTableStatistics(String tableFullName, Map<String,ColumnHandle> columnHandles) Get remote table statistics.

Methods inherited from class java.lang.Object

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

Field Detail

DATE_FORMATTER

public static final DateTimeFormatter DATE_FORMATTER

Constructor Detail

DataCenterClient

@Inject
public DataCenterClient(DataCenterConfig config,
                                okhttp3.OkHttpClient httpClient,
                                TypeManager typeManager)

Constructor of data center client.

Parameters:

config - data center config.

httpClient - http client.

typeManager - the type manager.

Method Detail

getCatalogNames

public Set<String> getCatalogNames()

Get catalogs from the remote data center.

Returns:

the catalogs

getSchemaNames

public Set<String> getSchemaNames(String catalog)

Get schema names from the given catalog

Parameters:

catalog - catalog name.

Returns:

schemas from remote data center's catalog

getTableNames

public Set<String> getTableNames(String catalog,
                                 String schema)

Get table names from the remote data center.

Parameters:

catalog - catalog name.

schema - schema name.

Returns:

tables form remote data center's schema

getTable

public DataCenterTable getTable(String catalog,
                                String schema,
                                String tableName)

Get table metadata.

Parameters:

catalog - catalog name.

schema - schema name.

tableName - table name.

Returns:

table information from remote data center's catalog.schema.tableName.

getColumns

public List<DataCenterColumn> getColumns(String sql)

Get the columns information of this sql.

Parameters:

sql - statement.

Returns:

the list of data center column that this sql contains.

getTableStatistics

public TableStatistics getTableStatistics(String tableFullName,
                                          Map<String,ColumnHandle> columnHandles)

Get remote table statistics.

Parameters:

tableFullName - the fully qualified table name

columnHandles - data center column handles

Returns:

the table statistics

getSplits

public int getSplits(String globalQueryId)

Get the split count form the server. If not possible, always return 1.

Parameters:

globalQueryId - the query id

Returns:

number of splits