Package cz.o2.proxima.direct.jdbc

Class JdbcOnlineAttributeReader

java.lang.Object

cz.o2.proxima.core.storage.AbstractStorage

cz.o2.proxima.direct.jdbc.JdbcOnlineAttributeReader

All Implemented Interfaces:

RandomAccessReader, java.io.Closeable, java.lang.AutoCloseable

public class JdbcOnlineAttributeReader
extends AbstractStorage
implements RandomAccessReader

Nested Class Summary

Nested classes/interfaces inherited from class cz.o2.proxima.core.storage.AbstractStorage

AbstractStorage.SerializableAbstractStorage

Nested classes/interfaces inherited from interface cz.o2.proxima.direct.core.randomaccess.RandomAccessReader

RandomAccessReader.Factory<T extends RandomAccessReader>, RandomAccessReader.GetRequest<T>, RandomAccessReader.Listing, RandomAccessReader.MultiFetch

Constructor Summary

Constructors

Constructor	Description
JdbcOnlineAttributeReader(JdbcDataAccessor accessor, SqlStatementFactory sqlStatementFactory, EntityDescriptor entityDesc, java.net.URI uri)

Method Summary

Modifier and Type	Method	Description
RandomAccessReader.Factory<?>	asFactory()	Convert instance of this reader to RandomAccessReader.Factory suitable for serialization.
void	close()
RandomOffset	fetchOffset(RandomAccessReader.Listing type, java.lang.String key)	Construct Offset from string (representing either key of the entity or attribute).
<T> java.util.Optional<KeyValue<T>>	get(java.lang.String key, java.lang.String attribute, AttributeDescriptor<T> desc, long stamp)	Retrieve data stored under given (key, attribute) pair (if any).
void	listEntities(RandomOffset offset, int limit, Consumer<Pair<RandomOffset,java.lang.String>> consumer)	List all entity keys with offset and limit.
<T> void	scanWildcard(java.lang.String key, AttributeDescriptor<T> wildcard, RandomOffset offset, long stamp, int limit, Consumer<KeyValue<T>> consumer)	List data stored for a particular wildcard attribute.
void	scanWildcardAll(java.lang.String key, RandomOffset offset, long stamp, int limit, Consumer<KeyValue<?>> consumer)	Scan all data stored per given key.

Methods inherited from class cz.o2.proxima.core.storage.AbstractStorage

equals, hashCode

Methods inherited from class java.lang.Object

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

Methods inherited from interface cz.o2.proxima.direct.core.randomaccess.RandomAccessReader

get, get, get, get, getEntityDescriptor, listEntities, multiFetch, scanWildcard, scanWildcard, scanWildcard, scanWildcardAll, scanWildcardAll, scanWildcardAll

Constructor Detail

JdbcOnlineAttributeReader

public JdbcOnlineAttributeReader(JdbcDataAccessor accessor,
                                 SqlStatementFactory sqlStatementFactory,
                                 EntityDescriptor entityDesc,
                                 java.net.URI uri)

Method Detail

fetchOffset

public RandomOffset fetchOffset(RandomAccessReader.Listing type,
                                java.lang.String key)

Description copied from interface: RandomAccessReader

Construct Offset from string (representing either key of the entity or attribute). The returned offset represents the first element that is following the given key, in case of equality.

Specified by:

fetchOffset in interface RandomAccessReader

Parameters:

type - the type of the key

key - the key of entity or attribute

Returns:

offset representation of the key

get

public <T> java.util.Optional<KeyValue<T>> get(java.lang.String key,
                                               java.lang.String attribute,
                                               AttributeDescriptor<T> desc,
                                               long stamp)

Description copied from interface: RandomAccessReader

Retrieve data stored under given (key, attribute) pair (if any).

Specified by:

get in interface RandomAccessReader

Type Parameters:

T - value type

Parameters:

key - key of the entity

attribute - name of the attribute

desc - the attribute to search for

stamp - timestamp to relatively to which retrieve the data

Returns:

optional KeyValue if present

scanWildcardAll

public void scanWildcardAll(java.lang.String key,
                            @Nullable
                            RandomOffset offset,
                            long stamp,
                            int limit,
                            Consumer<KeyValue<?>> consumer)

Description copied from interface: RandomAccessReader

Scan all data stored per given key.

Specified by:

scanWildcardAll in interface RandomAccessReader

Parameters:

key - the key whose KeyValues to scan

offset - offset to start from (next key value will be returned)

stamp - timestamp to relatively to which retrieve the data

limit - how many elements to process at most

consumer - consumer to use for scanning

scanWildcard

public <T> void scanWildcard(java.lang.String key,
                             AttributeDescriptor<T> wildcard,
                             @Nullable
                             RandomOffset offset,
                             long stamp,
                             int limit,
                             Consumer<KeyValue<T>> consumer)

Description copied from interface: RandomAccessReader

List data stored for a particular wildcard attribute.

Specified by:

scanWildcard in interface RandomAccessReader

Type Parameters:

T - value type

Parameters:

key - key of the entity

wildcard - wildcard attribute to scan

offset - name of attribute (including the prefix) to start from

stamp - timestamp to relatively to which retrieve the data

limit - maximal number of items to consume *

consumer - the consumer to stream data to

listEntities

public void listEntities(@Nullable
                         RandomOffset offset,
                         int limit,
                         Consumer<Pair<RandomOffset,java.lang.String>> consumer)

Description copied from interface: RandomAccessReader

List all entity keys with offset and limit.

Specified by:

listEntities in interface RandomAccessReader

Parameters:

offset - offset of the entities

limit - limit for number of results

consumer - consumer of results

asFactory

public RandomAccessReader.Factory<?> asFactory()

Description copied from interface: RandomAccessReader

Convert instance of this reader to RandomAccessReader.Factory suitable for serialization.

Specified by:

asFactory in interface RandomAccessReader

Returns:

the RandomAccessReader.Factory representing this reader

close

public void close()

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable