Package org.apache.hadoop.hdfs.server.federation.store

Class StateStoreUtils

java.lang.Object

org.apache.hadoop.hdfs.server.federation.store.StateStoreUtils

public final class StateStoreUtils
extends java.lang.Object

Set of utility functions used to work with the State Store.

Method Summary

Modifier and Type	Method	Description
static <T extends BaseRecord> java.util.List<T>	filterMultiple(Query<T> query, java.lang.Iterable<T> records)	Filters a list of records to find all records matching the query.
static java.lang.String	getHostPortString(java.net.InetSocketAddress address)	Returns address in form of host:port, empty string if address is null.
static <T extends BaseRecord> java.lang.Class<? extends BaseRecord>	getRecordClass(java.lang.Class<T> clazz)	Get the base class for a record class.
static <T extends BaseRecord> java.lang.Class<? extends BaseRecord>	getRecordClass(T record)	Get the base class for a record.
static <T extends BaseRecord> java.lang.String	getRecordName(java.lang.Class<T> clazz)	Get the base class name for a record.

Methods inherited from class java.lang.Object

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

Method Detail

getRecordClass

public static <T extends BaseRecord> java.lang.Class<? extends BaseRecord> getRecordClass(java.lang.Class<T> clazz)

Get the base class for a record class. If we get an implementation of a record we will return the real parent record class.

Type Parameters:

T - Type of the class of the data record to check.

Parameters:

clazz - Class of the data record to check.

Returns:

Base class for the record.

getRecordClass

public static <T extends BaseRecord> java.lang.Class<? extends BaseRecord> getRecordClass(T record)

Get the base class for a record. If we get an implementation of a record we will return the real parent record class.

Type Parameters:

T - Type of the class of the data record.

Parameters:

record - Record to check its main class.

Returns:

Base class for the record.

getRecordName

public static <T extends BaseRecord> java.lang.String getRecordName(java.lang.Class<T> clazz)

Get the base class name for a record. If we get an implementation of a record we will return the real parent record class.

Type Parameters:

T - Type of the class of the data record.

Parameters:

clazz - Class of the data record to check.

Returns:

Name of the base class for the record.

filterMultiple

public static <T extends BaseRecord> java.util.List<T> filterMultiple(Query<T> query,
                                                                      java.lang.Iterable<T> records)

Filters a list of records to find all records matching the query.

Type Parameters:

T - Type of the class of the data record.

Parameters:

query - Map of field names and objects to use to filter results.

records - List of data records to filter.

Returns:

List of all records matching the query (or empty list if none match), null if the data set could not be filtered.

getHostPortString

public static java.lang.String getHostPortString(java.net.InetSocketAddress address)

Returns address in form of host:port, empty string if address is null.

Parameters:

address - address

Returns:

host:port