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

Class RecordStore<R extends BaseRecord>

java.lang.Object

org.apache.hadoop.hdfs.server.federation.store.RecordStore<R>

Type Parameters:

R - Record to store by this interface.

Direct Known Subclasses:

CachedRecordStore

@Private
@Evolving
public abstract class RecordStore<R extends BaseRecord>
extends Object

Store records in the State Store. Subclasses provide interfaces to operate on those records.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	RecordStore(Class<R> clazz, StateStoreDriver stateStoreDriver)	Create a new store for records.

Method Summary

Modifier and Type	Method	Description
StateStoreDriver	getDriver()	Get the State Store driver.
Class<R>	getRecordClass()	Report a required record to the data store.
static <T extends RecordStore<?>> T	newInstance(Class<T> clazz, StateStoreDriver driver)	Build a state store API implementation interface.

Methods inherited from class java.lang.Object

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

Constructor Details

RecordStore

protected RecordStore(Class<R> clazz,
 StateStoreDriver stateStoreDriver)

Create a new store for records.

Parameters:

clazz - Class of the record to store.

stateStoreDriver - Driver for the State Store.

Method Details

getRecordClass

public Class<R> getRecordClass()

Report a required record to the data store. The data store uses this to create/maintain storage for the record.

Returns:

The class of the required record or null if no record is required for this interface.

getDriver

public StateStoreDriver getDriver()

Get the State Store driver.

Returns:

State Store driver.

newInstance

public static <T extends RecordStore<?>> T newInstance(Class<T> clazz,
 StateStoreDriver driver)

Build a state store API implementation interface.

Type Parameters:

T - Instance of type RecordStore.

Parameters:

clazz - The specific interface implementation to create

driver - The StateStoreDriver implementation in use.

Returns:

An initialized instance of the specified state store API implementation.