Package org.nuxeo.runtime.kv

Interface KeyValueStore

All Known Subinterfaces:

KeyValueStoreProvider

All Known Implementing Classes:

AbstractKeyValueStoreProvider, MemKeyValueStore, MongoDBKeyValueStore, SQLKeyValueStore

public interface KeyValueStore

Key/Value Store.

This is the interface for a Key/Value store, which stores simple values associated to keys.

A Key/Value store is thread-safe.

Since:

9.1

Method Summary

Modifier and Type	Method	Description
long	addAndGet(String key, long delta)	Atomically adds the delta to the value associated to the key, interpreted as a long represented as a string.
boolean	compareAndSet(String key, byte[] expected, byte[] value)	Atomically sets the value associated to the key to the given value if the current value is the expected value.
boolean	compareAndSet(String key, byte[] expected, byte[] value, long ttl)	Atomically sets the value associated to the key to the given value, with the given TTL, if the current value is the expected value.
boolean	compareAndSet(String key, String expected, String value)	Atomically sets the value associated to the key to the given value if the current value is the expected value.
boolean	compareAndSet(String key, String expected, String value, long ttl)	Atomically sets the value associated to the key to the given value, with the given TTL, if the current value is the expected value.
byte[]	get(String key)	Retrieves the value associated to the key.
Map<String,byte[]>	get(Collection<String> keys)	Retrieves the key/value map associated with the keys.
Long	getLong(String key)	Retrieves the value associated to the key.
Map<String,Long>	getLongs(Collection<String> keys)	Retrieves the key/value map associated with the keys.
String	getString(String key)	Retrieves the value associated to the key.
Map<String,String>	getStrings(Collection<String> keys)	Retrieves the key/value map associated with the keys.
void	put(String key, byte[] value)	Sets the value associated to the key.
void	put(String key, byte[] value, long ttl)	Sets the value associated to the key, and a TTL.
void	put(String key, Long value)	Sets the value associated to the key.
void	put(String key, Long value, long ttl)	Sets the value associated to the key.
void	put(String key, String value)	Sets the value associated to the key.
void	put(String key, String value, long ttl)	Sets the value associated to the key, and a TTL.
boolean	setTTL(String key, long ttl)	Sets the TTL for an existing key.

Method Details

put

void put(String key,
 byte[] value)

Sets the value associated to the key.

Parameters:

key - the key

value - the value, which may be null

put

void put(String key,
 String value)

Sets the value associated to the key.

Parameters:

key - the key

value - the value, which may be null

Since:

9.3

put

void put(String key,
 Long value)

Sets the value associated to the key.

Parameters:

key - the key

value - the value, which may be null

Since:

10.2

put

void put(String key,
 byte[] value,
 long ttl)

Sets the value associated to the key, and a TTL.

Parameters:

key - the key

value - the value, which may be null

ttl - the TTL, in seconds (0 for infinite)

Since:

9.3

put

void put(String key,
 String value,
 long ttl)

Sets the value associated to the key, and a TTL.

Parameters:

key - the key

value - the value, which may be null

ttl - the TTL, in seconds (0 for infinite)

Since:

9.3

put

void put(String key,
 Long value,
 long ttl)

Sets the value associated to the key.

Parameters:

key - the key

value - the value, which may be null

ttl - the TTL, in seconds (0 for infinite)

Since:

10.2

setTTL

boolean setTTL(String key,
 long ttl)

Sets the TTL for an existing key.

Parameters:

key - the key

ttl - the TTL, in seconds (0 for infinite)

Returns:

true if the TTL has been set, or false if the key does not exist

Since:

9.3

get

byte[] get(String key)

Retrieves the value associated to the key.

Parameters:

key - the key

Returns:

the value, or null if there is no value

getString

String getString(String key)

Retrieves the value associated to the key.

Parameters:

key - the key

Returns:

the value, or null if there is no value

Throws:

IllegalArgumentException - if the value cannot be returned as a String

Since:

9.3

getLong

Long getLong(String key)
      throws NumberFormatException

Retrieves the value associated to the key.

Parameters:

key - the key

Returns:

the value, or null if there is no value

Throws:

NumberFormatException - if the value cannot be returned as a Long

Since:

10.2

get

Map<String,byte[]> get(Collection<String> keys)

Retrieves the key/value map associated with the keys.

Parameters:

keys - the keys

Returns:

the key/value map

Since:

9.10

getStrings

Map<String,String> getStrings(Collection<String> keys)

Retrieves the key/value map associated with the keys.

Parameters:

keys - the keys

Returns:

the key/value map

Throws:

IllegalArgumentException - if one of the values cannot be returned as a String

Since:

9.10

getLongs

Map<String,Long> getLongs(Collection<String> keys)
                   throws NumberFormatException

Retrieves the key/value map associated with the keys.

Parameters:

keys - the keys

Returns:

the key/value map

Throws:

NumberFormatException - if one of the values cannot be returned as a Long

Since:

10.2

compareAndSet

boolean compareAndSet(String key,
 byte[] expected,
 byte[] value)

Atomically sets the value associated to the key to the given value if the current value is the expected value.

Note value comparison is done by value and not by reference.

Parameters:

key - the key

expected - the expected value, which may be null

value - the updated value, which may be null

Returns:

true if the value was updated, or false if not (the expected value was not found)

compareAndSet

boolean compareAndSet(String key,
 byte[] expected,
 byte[] value,
 long ttl)

Atomically sets the value associated to the key to the given value, with the given TTL, if the current value is the expected value.

Note value comparison is done by value and not by reference.

Parameters:

key - the key

expected - the expected value, which may be null

value - the updated value, which may be null

ttl - the TTL, in seconds (0 for infinite)

Returns:

true if the value was updated, or false if not (the expected value was not found)

Since:

9.3

compareAndSet

boolean compareAndSet(String key,
 String expected,
 String value)

Atomically sets the value associated to the key to the given value if the current value is the expected value.

Note value comparison is done by value and not by reference.

Parameters:

key - the key

expected - the expected value, which may be null

value - the updated value, which may be null

Returns:

true if the value was updated, or false if not (the expected value was not found)

Since:

9.3

compareAndSet

boolean compareAndSet(String key,
 String expected,
 String value,
 long ttl)

Atomically sets the value associated to the key to the given value, with the given TTL, if the current value is the expected value.

Note value comparison is done by value and not by reference.

Parameters:

key - the key

expected - the expected value, which may be null

value - the updated value, which may be null

ttl - the TTL, in seconds (0 for infinite)

Returns:

true if the value was updated, or false if not (the expected value was not found)

Since:

9.3

addAndGet

long addAndGet(String key,
 long delta)

Atomically adds the delta to the value associated to the key, interpreted as a long represented as a string.

If the value does not exist (if get(java.lang.String) would return null), it is interpreted as 0.

Parameters:

key - the key

delta - the delta to add

Returns:

the new value

Throws:

NumberFormatException - if the existing value cannot be interpreted as a long

Since:

10.2