voldemort.client
Class LazyStoreClient<K,V>

java.lang.Object
  voldemort.client.LazyStoreClient<K,V>

All Implemented Interfaces:

StoreClient<K,V>

public class LazyStoreClient<K,V>
extends java.lang.Object
implements StoreClient<K,V>

A StoreClient with lazy initialization. This is useful existing codes that initializes clients at service deployment time, when the servers may or may not be available

Constructor Summary

LazyStoreClient(java.util.concurrent.Callable<StoreClient<K,V>> storeClientThunk)

LazyStoreClient(java.util.concurrent.Callable<StoreClient<K,V>> storeClientThunk, boolean instantInit)
A Hybrid store client which tries to do immediate bootstrap.

Method Summary

boolean	applyUpdate(UpdateAction<K,V> action) Apply the given action repeatedly until no ObsoleteVersionException is thrown.
boolean	applyUpdate(UpdateAction<K,V> action, int maxTries) Apply the given action repeatedly until no ObsoleteVersionException is thrown or maxTries unsuccessful attempts have been made.
boolean	delete(K key) Delete any version of the given key which equal to or less than the current versions
boolean	delete(K key, Version version) Delete the specified version and any prior versions of the given key
Versioned<V>	get(K key) Get the versioned value associated with the given key or null if no value is associated with the key.
Versioned<V>	get(K key, java.lang.Object transforms) Get the versioned value associated with the given key and apply the given transforms to it before returning the value.
Versioned<V>	get(K key, Versioned<V> defaultValue) Get the versioned value associated with the given key or the defaultValue if no value is associated with the key.
java.util.Map<K,Versioned<V>>	getAll(java.lang.Iterable<K> keys) Gets the versioned values associated with the given keys and returns them in a Map of keys to versioned values.
java.util.Map<K,Versioned<V>>	getAll(java.lang.Iterable<K> keys, java.util.Map<K,java.lang.Object> transforms) Like getAll, except that the transforms are applied on the value associated with each key before returning the results
java.util.List<Node>	getResponsibleNodes(K key) Returns the list of nodes which should have this key.
StoreClient<K,V>	getStoreClient()
V	getValue(K key) Get the value associated with the given key or null if there is no value associated with this key.
V	getValue(K key, V defaultValue) Get the value associated with the given key or defaultValue if there is no value associated with the key.
protected StoreClient<K,V>	initStoreClient()
Version	put(K key, V value) Associated the given value to the key, clobbering any existing values stored for the key.
Version	put(K key, Versioned<V> versioned) Put the given Versioned value into the store for the given key if the version is greater to or concurrent with existing values.
Version	put(K key, V value, java.lang.Object transforms) Like #put(Object, Object), except that the given transforms are applied on the value before writing it to the store
boolean	putIfNotObsolete(K key, Versioned<V> versioned) Put the versioned value to the key, ignoring any ObsoleteVersionException that may be thrown

Methods inherited from class java.lang.Object

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

Constructor Detail

LazyStoreClient

public LazyStoreClient(java.util.concurrent.Callable<StoreClient<K,V>> storeClientThunk)

LazyStoreClient

public LazyStoreClient(java.util.concurrent.Callable<StoreClient<K,V>> storeClientThunk,
                       boolean instantInit)

A Hybrid store client which tries to do immediate bootstrap. In case of an exception, we fallback to the lazy way of doing initialization.

Parameters:

storeClientThunk - The callback invoked for doing the actual bootstrap

instantInit - A boolean flag when set indicates that we should try to immediately bootstrap

Method Detail

getStoreClient

public StoreClient<K,V> getStoreClient()

initStoreClient

protected StoreClient<K,V> initStoreClient()

getValue

public V getValue(K key)

Description copied from interface: StoreClient

Get the value associated with the given key or null if there is no value associated with this key. This method strips off all version information and is only useful when no further storage operations will be done on this key.

Specified by:

getValue in interface StoreClient<K,V>

Parameters:

key - The key

getValue

public V getValue(K key,
                  V defaultValue)

Description copied from interface: StoreClient

Get the value associated with the given key or defaultValue if there is no value associated with the key. This method strips off all version information and is only useful when no further storage operations will be done on this key.

Specified by:

getValue in interface StoreClient<K,V>

Parameters:

key - The key for which to fetch the associated value

defaultValue - A value to return if there is no value associated with this key

Returns:

Either the value stored for the key or the default value.

get

public Versioned<V> get(K key)

Description copied from interface: StoreClient

Get the versioned value associated with the given key or null if no value is associated with the key.

Specified by:

get in interface StoreClient<K,V>

Parameters:

key - The key for which to fetch the value.

Returns:

The versioned value, or null if no value is stored for this key.

get

public Versioned<V> get(K key,
                        java.lang.Object transforms)

Description copied from interface: StoreClient

Get the versioned value associated with the given key and apply the given transforms to it before returning the value. Returns null if no value is associated with the key

Specified by:

get in interface StoreClient<K,V>

Parameters:

key - the key for which the value is fetched

transforms - the transforms to be applied on the value fetched from the store

Returns:

the transformed versioned value, or null if no value is stored for this key

getAll

public java.util.Map<K,Versioned<V>> getAll(java.lang.Iterable<K> keys)

Description copied from interface: StoreClient

Gets the versioned values associated with the given keys and returns them in a Map of keys to 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 StoreClient<K,V>

Parameters:

keys - The keys for which to fetch the values.

Returns:

A Map of keys to versioned values.

getAll

public java.util.Map<K,Versioned<V>> getAll(java.lang.Iterable<K> keys,
                                            java.util.Map<K,java.lang.Object> transforms)

Description copied from interface: StoreClient

Like getAll, except that the transforms are applied on the value associated with each key before returning the results

Specified by:

getAll in interface StoreClient<K,V>

Parameters:

keys - the keys for which the values are fetched

transforms - the map of transforms, describing the transform to be applied to the value for each key

Returns:

A map of keys to transformed versioned values

get

public Versioned<V> get(K key,
                        Versioned<V> defaultValue)

Description copied from interface: StoreClient

Get the versioned value associated with the given key or the defaultValue if no value is associated with the key.

Specified by:

get in interface StoreClient<K,V>

Parameters:

key - The key for which to fetch the value.

Returns:

The versioned value, or the defaultValue if no value is stored for this key.

put

public Version put(K key,
                   V value)

Description copied from interface: StoreClient

Associated the given value to the key, clobbering any existing values stored for the key.

Specified by:

put in interface StoreClient<K,V>

Parameters:

key - The key

value - The value

Returns:

version The version of the object

put

public Version put(K key,
                   V value,
                   java.lang.Object transforms)

Description copied from interface: StoreClient

Like #put(Object, Object), except that the given transforms are applied on the value before writing it to the store

Specified by:

put in interface StoreClient<K,V>

Parameters:

key - the key

value - the value

transforms - the transforms to be applied on the value

Returns:

version The version of the object

put

public Version put(K key,
                   Versioned<V> versioned)
            throws ObsoleteVersionException

Description copied from interface: StoreClient

Put the given Versioned value into the store for the given key if the version is greater to or concurrent with existing values. Throw an ObsoleteVersionException otherwise.

Specified by:

put in interface StoreClient<K,V>

Parameters:

key - The key

versioned - The value and its versioned

Throws:

ObsoleteVersionException

putIfNotObsolete

public boolean putIfNotObsolete(K key,
                                Versioned<V> versioned)

Description copied from interface: StoreClient

Put the versioned value to the key, ignoring any ObsoleteVersionException that may be thrown

Specified by:

putIfNotObsolete in interface StoreClient<K,V>

Parameters:

key - The key

versioned - The versioned value

Returns:

true if the put succeeded

applyUpdate

public boolean applyUpdate(UpdateAction<K,V> action)

Description copied from interface: StoreClient

Apply the given action repeatedly until no ObsoleteVersionException is thrown. This is useful for implementing a read-modify-store loop that could be pre-empted by another concurrent update, and should be repeated until it succeeds.

Specified by:

applyUpdate in interface StoreClient<K,V>

Parameters:

action - The action to apply. This is meant as a callback for the user to extend to provide their own logic.

Returns:

true if the action is successfully applied, false if the 3 attempts all result in ObsoleteVersionException

applyUpdate

public boolean applyUpdate(UpdateAction<K,V> action,
                           int maxTries)

Description copied from interface: StoreClient

Apply the given action repeatedly until no ObsoleteVersionException is thrown or maxTries unsuccessful attempts have been made. This is useful for implementing a read-modify-store loop.

Specified by:

applyUpdate in interface StoreClient<K,V>

Parameters:

action - The action to apply

Returns:

true if the action is successfully applied, false if maxTries failed attempts have been made

delete

public boolean delete(K key)

Description copied from interface: StoreClient

Delete any version of the given key which equal to or less than the current versions

Specified by:

delete in interface StoreClient<K,V>

Parameters:

key - The key

Returns:

true if anything is deleted

delete

public boolean delete(K key,
                      Version version)

Description copied from interface: StoreClient

Delete the specified version and any prior versions of the given key

Specified by:

delete in interface StoreClient<K,V>

Parameters:

key - The key to delete

version - The version of the key

Returns:

true if anything is deleted

getResponsibleNodes

public java.util.List<Node> getResponsibleNodes(K key)

Description copied from interface: StoreClient

Returns the list of nodes which should have this key.

Specified by:

getResponsibleNodes in interface StoreClient<K,V>

Returns:

a list of Nodes which should hold this key