voldemort.store.serialized
Class SerializingStorageEngine<K,V,T>

java.lang.Object
  voldemort.store.serialized.SerializingStore<K,V,T>
      voldemort.store.serialized.SerializingStorageEngine<K,V,T>

Type Parameters:

K - The key type

V - The value type

T - the transforms type

All Implemented Interfaces:

StorageEngine<K,V,T>, Store<K,V,T>

public class SerializingStorageEngine<K,V,T>
extends SerializingStore<K,V,T>
implements StorageEngine<K,V,T>

A StorageEngine that handles serialization to bytes, transforming each request to a request to StorageEngine

Constructor Summary

SerializingStorageEngine(StorageEngine<ByteArray,byte[],byte[]> innerStorageEngine, Serializer<K> keySerializer, Serializer<V> valueSerializer, Serializer<T> transformsSerializer)

Method Summary

boolean	beginBatchModifications() A lot of storage engines support efficient methods for performing large number of writes (puts/deletes) against the data source.
boolean	endBatchModifications()
ClosableIterator<Pair<K,Versioned<V>>>	entries() Get an iterator over pairs of entries in the store.
ClosableIterator<Pair<K,Versioned<V>>>	entries(int partition) Get an iterator over pairs of entries in a store's partition.
boolean	isPartitionAware() Is the data persistence aware of partitions? In other words is the data internally stored on a per partition basis or together
boolean	isPartitionScanSupported() Does the storage engine support efficient scanning of a single partition
ClosableIterator<K>	keys() Get an iterator over keys in the store.
ClosableIterator<K>	keys(int partition) Get an iterator over keys in the store's partition Note that the iterator need not be threadsafe, and that it must be manually closed after use.
void	truncate() Truncate all entries in the store
static <K1,V1,T1> SerializingStorageEngine<K1,V1,T1>	wrap(StorageEngine<ByteArray,byte[],byte[]> s, Serializer<K1> k, Serializer<V1> v, Serializer<T1> t)

Methods inherited from class voldemort.store.serialized.SerializingStore

close, delete, get, getAll, getCapability, getKeySerializer, getName, getValueSerializer, getVersions, put, wrap

Methods inherited from class java.lang.Object

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

Methods inherited from interface voldemort.store.Store

close, delete, get, getAll, getCapability, getName, getVersions, put

Constructor Detail

SerializingStorageEngine

public SerializingStorageEngine(StorageEngine<ByteArray,byte[],byte[]> innerStorageEngine,
                                Serializer<K> keySerializer,
                                Serializer<V> valueSerializer,
                                Serializer<T> transformsSerializer)

Method Detail

wrap

public static <K1,V1,T1> SerializingStorageEngine<K1,V1,T1> wrap(StorageEngine<ByteArray,byte[],byte[]> s,
                                                                 Serializer<K1> k,
                                                                 Serializer<V1> v,
                                                                 Serializer<T1> t)

entries

public ClosableIterator<Pair<K,Versioned<V>>> entries()

Description copied from interface: StorageEngine

Get an iterator over pairs of entries in the store. The key is the first element in the pair and the versioned value is the second element. Note that the iterator need not be threadsafe, and that it must be manually closed after use.

Specified by:

entries in interface StorageEngine<K,V,T>

Returns:

An iterator over the entries in this StorageEngine.

keys

public ClosableIterator<K> keys()

Description copied from interface: StorageEngine

Get an iterator over keys in the store. Note that the iterator need not be threadsafe, and that it must be manually closed after use.

Specified by:

keys in interface StorageEngine<K,V,T>

Returns:

An iterator over the keys in this StorageEngine.

entries

public ClosableIterator<Pair<K,Versioned<V>>> entries(int partition)

Description copied from interface: StorageEngine

Get an iterator over pairs of entries in a store's partition. The key is the first element in the pair and the versioned value is the second element. Note that the iterator need not be threadsafe, and that it must be manually closed after use.

Specified by:

entries in interface StorageEngine<K,V,T>

Parameters:

partition - partition whose entries are to be fetched

Returns:

An iterator over the entries in this StorageEngine.

keys

public ClosableIterator<K> keys(int partition)

Description copied from interface: StorageEngine

Get an iterator over keys in the store's partition Note that the iterator need not be threadsafe, and that it must be manually closed after use.

Specified by:

keys in interface StorageEngine<K,V,T>

Parameters:

partition - partition whose keys are to be fetched

Returns:

An iterator over the keys in this StorageEngine.

truncate

public void truncate()

Description copied from interface: StorageEngine

Truncate all entries in the store

Specified by:

truncate in interface StorageEngine<K,V,T>

isPartitionAware

public boolean isPartitionAware()

Description copied from interface: StorageEngine

Is the data persistence aware of partitions? In other words is the data internally stored on a per partition basis or together

Specified by:

isPartitionAware in interface StorageEngine<K,V,T>

Returns:

Boolean indicating if the data persistence is partition aware

isPartitionScanSupported

public boolean isPartitionScanSupported()

Description copied from interface: StorageEngine

Does the storage engine support efficient scanning of a single partition

Specified by:

isPartitionScanSupported in interface StorageEngine<K,V,T>

Returns:

true if the storage engine implements the capability. false otherwise

beginBatchModifications

public boolean beginBatchModifications()

Description copied from interface: StorageEngine

A lot of storage engines support efficient methods for performing large number of writes (puts/deletes) against the data source. This method puts the storage engine in this batch write mode

Specified by:

beginBatchModifications in interface StorageEngine<K,V,T>

Returns:

true if the storage engine took successful action to switch to 'batch-write' mode

endBatchModifications

public boolean endBatchModifications()

Specified by:

endBatchModifications in interface StorageEngine<K,V,T>

Returns:

true if the storage engine successfully returned to normal mode