voldemort.store.views
Class ViewStorageEngine

java.lang.Object
  voldemort.store.AbstractStore<K,V,T>
      voldemort.store.AbstractStorageEngine<ByteArray,byte[],byte[]>
          voldemort.store.views.ViewStorageEngine

All Implemented Interfaces:

StorageEngine<ByteArray,byte[],byte[]>, Store<ByteArray,byte[],byte[]>

@Experimental
public class ViewStorageEngine
extends AbstractStorageEngine<ByteArray,byte[],byte[]>

Views are transformations of other stores

Constructor Summary

ViewStorageEngine(java.lang.String name, StorageEngine<ByteArray,byte[],byte[]> target, Serializer<?> valSerializer, Serializer<?> transformSerializer, Serializer<?> targetKeySerializer, Serializer<?> targetValSerializer, CompressionStrategy valueCompressionStrategy, View<?,?,?,?> valueTrans)

Method Summary

boolean	delete(ByteArray key, Version version) Delete all entries prior to the given version
ClosableIterator<Pair<ByteArray,Versioned<byte[]>>>	entries() Get an iterator over pairs of entries in the store.
ClosableIterator<Pair<ByteArray,Versioned<byte[]>>>	entries(int partition) Get an iterator over pairs of entries in a store's partition.
java.util.List<Versioned<byte[]>>	get(ByteArray key, byte[] transforms) Get the value associated with the given key
java.util.Map<ByteArray,java.util.List<Versioned<byte[]>>>	getAll(java.lang.Iterable<ByteArray> keys, java.util.Map<ByteArray,byte[]> transforms) Get the values associated with the given keys and returns them in a Map of keys to a list of versioned values.
java.lang.Object	getCapability(StoreCapabilityType capability) Get some capability of the store.
java.util.List<Version>	getVersions(ByteArray key) Get the versions associated with the given key.
boolean	isPartitionAware() Are partitions persisted in distinct files? In other words is the data stored on disk on a per-partition basis? This is really for the read-only use case in which each partition is stored in a distinct file.
boolean	isPartitionScanSupported() Does the storage engine support efficient scanning of a single partition?
ClosableIterator<ByteArray>	keys() Get an iterator over keys in the store.
ClosableIterator<ByteArray>	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	put(ByteArray key, Versioned<byte[]> value, byte[] transforms) Associate the value with the key and version in this store
void	truncate() Truncate all entries in the store

Methods inherited from class voldemort.store.AbstractStorageEngine

beginBatchModifications, endBatchModifications, getAndLock, multiVersionPut, putAndUnlock, releaseLock, resolveAndConstructVersionsToPersist

Methods inherited from class voldemort.store.AbstractStore

close, delete, get, getAll, getName, put

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, getName, put

Constructor Detail

ViewStorageEngine

public ViewStorageEngine(java.lang.String name,
                         StorageEngine<ByteArray,byte[],byte[]> target,
                         Serializer<?> valSerializer,
                         Serializer<?> transformSerializer,
                         Serializer<?> targetKeySerializer,
                         Serializer<?> targetValSerializer,
                         CompressionStrategy valueCompressionStrategy,
                         View<?,?,?,?> valueTrans)

Method Detail

delete

public boolean delete(ByteArray key,
                      Version version)
               throws VoldemortException

Description copied from interface: Store

Delete all entries prior to the given version

Specified by:

delete in interface Store<ByteArray,byte[],byte[]>

Overrides:

delete in class AbstractStore<ByteArray,byte[],byte[]>

Parameters:

key - The key to delete

version - The current value of the key

Returns:

True if anything was deleted

Throws:

VoldemortException

get

public java.util.List<Versioned<byte[]>> get(ByteArray key,
                                             byte[] transforms)
                                      throws VoldemortException

Description copied from interface: Store

Get the value associated with the given key

Specified by:

get in interface Store<ByteArray,byte[],byte[]>

Overrides:

get in class AbstractStore<ByteArray,byte[],byte[]>

Parameters:

key - The key to check for

Returns:

The value associated with the key or an empty list if no values are found.

Throws:

VoldemortException

getAll

public java.util.Map<ByteArray,java.util.List<Versioned<byte[]>>> getAll(java.lang.Iterable<ByteArray> keys,
                                                                         java.util.Map<ByteArray,byte[]> transforms)
                                                                  throws VoldemortException

Description copied from interface: Store

Get the values associated with the given keys and returns them in a Map of keys to a list of versioned values. Note that the returned map will only contain entries for the keys which have a value associated with them.

Specified by:

getAll in interface Store<ByteArray,byte[],byte[]>

Overrides:

getAll in class AbstractStore<ByteArray,byte[],byte[]>

Parameters:

keys - The keys to check for.

Returns:

A Map of keys to a list of versioned values.

Throws:

VoldemortException

getVersions

public java.util.List<Version> getVersions(ByteArray key)

Description copied from interface: Store

Get the versions associated with the given key. This is used in a put call to write a new value for this key

Specified by:

getVersions in interface Store<ByteArray,byte[],byte[]>

Overrides:

getVersions in class AbstractStore<ByteArray,byte[],byte[]>

Parameters:

key - The key to retrieve the versions for

Returns:

List of Versions associated with this key.

put

public void put(ByteArray key,
                Versioned<byte[]> value,
                byte[] transforms)
         throws VoldemortException

Description copied from interface: Store

Associate the value with the key and version in this store

Specified by:

put in interface Store<ByteArray,byte[],byte[]>

Overrides:

put in class AbstractStore<ByteArray,byte[],byte[]>

Parameters:

key - The key to use

value - The value to store and its version.

Throws:

VoldemortException

entries

public ClosableIterator<Pair<ByteArray,Versioned<byte[]>>> 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<ByteArray,byte[],byte[]>

Overrides:

entries in class AbstractStorageEngine<ByteArray,byte[],byte[]>

Returns:

An iterator over the entries in this StorageEngine.

keys

public ClosableIterator<ByteArray> 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<ByteArray,byte[],byte[]>

Overrides:

keys in class AbstractStorageEngine<ByteArray,byte[],byte[]>

Returns:

An iterator over the keys in this StorageEngine.

entries

public ClosableIterator<Pair<ByteArray,Versioned<byte[]>>> 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<ByteArray,byte[],byte[]>

Overrides:

entries in class AbstractStorageEngine<ByteArray,byte[],byte[]>

Parameters:

partition - partition whose entries are to be fetched

Returns:

An iterator over the entries in this StorageEngine.

keys

public ClosableIterator<ByteArray> 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<ByteArray,byte[],byte[]>

Overrides:

keys in class AbstractStorageEngine<ByteArray,byte[],byte[]>

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<ByteArray,byte[],byte[]>

Overrides:

truncate in class AbstractStorageEngine<ByteArray,byte[],byte[]>

getCapability

public java.lang.Object getCapability(StoreCapabilityType capability)

Description copied from interface: Store

Get some capability of the store. Examples would be the serializer used, or the routing strategy. This provides a mechanism to verify that the store hierarchy has some set of capabilities without knowing the precise layering.

Specified by:

getCapability in interface Store<ByteArray,byte[],byte[]>

Overrides:

getCapability in class AbstractStore<ByteArray,byte[],byte[]>

Parameters:

capability - The capability type to retrieve

Returns:

The given capaiblity

isPartitionAware

public boolean isPartitionAware()

Description copied from interface: StorageEngine

Are partitions persisted in distinct files? In other words is the data stored on disk on a per-partition basis? This is really for the read-only use case in which each partition is stored in a distinct file.

Specified by:

isPartitionAware in interface StorageEngine<ByteArray,byte[],byte[]>

Overrides:

isPartitionAware in class AbstractStorageEngine<ByteArray,byte[],byte[]>

Returns:

Boolean indicating if partitions are persisted in distinct files (read-only use case).

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<ByteArray,byte[],byte[]>

Overrides:

isPartitionScanSupported in class AbstractStorageEngine<ByteArray,byte[],byte[]>

Returns:

true if the storage engine implements the capability. false otherwise