org.apache.tajo.storage

Class OldStorageManager

java.lang.Object

org.apache.tajo.storage.OldStorageManager

public class OldStorageManager
extends Object

It handles available table spaces and cache TableSpace instances.

Field Summary

Fields

Modifier and Type	Field and Description
protected static Map<String,Class<? extends Appender>>	APPENDER_HANDLER_CACHE Cache of appender handlers for each storage type.
protected static Map<Class<?>,Constructor<?>>	CONSTRUCTOR_CACHE Cache of constructors for each class.
protected static Map<String,Class<? extends Scanner>>	SCANNER_HANDLER_CACHE Cache of scanner handlers for each storage type.

Constructor Summary

Constructors

Constructor and Description
OldStorageManager()

Method Summary

Methods

Modifier and Type	Method and Description
protected static void	clearCache() Clear all class cache
static Tablespace	getStorageManager(TajoConf tajoConf, String dataFormat) Returns the proper Tablespace instance according to the dataFormat.
static Tablespace	getStorageManager(TajoConf tajoConf, URI uri, String dataFormat) Returns the proper Tablespace instance according to the dataFormat
static <T> T	newAppenderInstance(Class<T> theClass, org.apache.hadoop.conf.Configuration conf, TaskAttemptId taskAttemptId, TableMeta meta, Schema schema, org.apache.hadoop.fs.Path workDir) Creates a scanner instance.
static <T> T	newScannerInstance(Class<T> theClass, org.apache.hadoop.conf.Configuration conf, Schema schema, TableMeta meta, Fragment fragment) Creates a scanner instance.
static void	shutdown() Close Tablespace

Methods inherited from class java.lang.Object

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

Field Detail

SCANNER_HANDLER_CACHE

protected static final Map<String,Class<? extends Scanner>> SCANNER_HANDLER_CACHE

Cache of scanner handlers for each storage type.

APPENDER_HANDLER_CACHE

protected static final Map<String,Class<? extends Appender>> APPENDER_HANDLER_CACHE

Cache of appender handlers for each storage type.

CONSTRUCTOR_CACHE

protected static Map<Class<?>,Constructor<?>> CONSTRUCTOR_CACHE

Cache of constructors for each class. Pins the classes so they can't be garbage collected until ReflectionUtils can be collected.

Constructor Detail

OldStorageManager

public OldStorageManager()

Method Detail

clearCache

protected static void clearCache()

Clear all class cache

shutdown

public static void shutdown()
                     throws IOException

Close Tablespace

Throws:

IOException

getStorageManager

public static Tablespace getStorageManager(TajoConf tajoConf,
                           String dataFormat)
                                    throws IOException

Returns the proper Tablespace instance according to the dataFormat.

Parameters:

tajoConf - Tajo system property.

dataFormat - Storage type

Returns:

Throws:

IOException

getStorageManager

public static Tablespace getStorageManager(TajoConf tajoConf,
                           URI uri,
                           String dataFormat)
                                    throws IOException

Returns the proper Tablespace instance according to the dataFormat

Parameters:

tajoConf - Tajo system property.

uri - Key that can identify each storage manager(may be a path)

dataFormat - Storage type

Returns:

Throws:

IOException

newScannerInstance

public static <T> T newScannerInstance(Class<T> theClass,
                       org.apache.hadoop.conf.Configuration conf,
                       Schema schema,
                       TableMeta meta,
                       Fragment fragment)

Creates a scanner instance.

Type Parameters:

T -

Parameters:

theClass - Concrete class of scanner

conf - System property

schema - Input schema

meta - Table meta data

fragment - The fragment for scanning

Returns:

The scanner instance

newAppenderInstance

public static <T> T newAppenderInstance(Class<T> theClass,
                        org.apache.hadoop.conf.Configuration conf,
                        TaskAttemptId taskAttemptId,
                        TableMeta meta,
                        Schema schema,
                        org.apache.hadoop.fs.Path workDir)

Creates a scanner instance.

Type Parameters:

T -

Parameters:

theClass - Concrete class of scanner

conf - System property

taskAttemptId - Task id

meta - Table meta data

schema - Input schema

workDir - Working directory

Returns:

The scanner instance