KV

Data Structures
struct	JKVOperation
struct	JKV

Typedefs
typedef struct JKV	JKV
typedef void(*	JKVGetFunc) (gpointer, guint32, gpointer)
typedef struct JKVOperation	JKVOperation

Functions
JKV *	j_kv_new (gchar const *namespace, gchar const *key)
JKV *	j_kv_new_for_index (guint32 index, gchar const *namespace, gchar const *key)
JKV *	j_kv_ref (JKV *kv)
void	j_kv_unref (JKV *kv)
void	j_kv_put (JKV *kv, gpointer value, guint32 value_len, GDestroyNotify value_destroy, JBatch *batch)
void	j_kv_delete (JKV *kv, JBatch *batch)
void	j_kv_get (JKV *kv, gpointer *value, guint32 *value_len, JBatch *batch)
void	j_kv_get_callback (JKV *kv, JKVGetFunc func, gpointer data, JBatch *batch)
JBackend *	j_kv_get_backend (void)

Detailed Description

Data structures and functions for managing key-value pairs.

Typedef Documentation

JKV

typedef struct JKV JKV

JKVGetFunc

typedef void(* JKVGetFunc) (gpointer, guint32, gpointer)

A callback for j_kv_get_callback.

The callback will receive a pointer to the value (must be freed by the caller), the value's length and a pointer to optional user-provided data.

JKVOperation

typedef struct JKVOperation JKVOperation

Function Documentation

j_kv_delete()

void j_kv_delete	(	JKV *	kv,
		JBatch *	batch
	)

Deletes a key-value pair.

Parameters

kv	A JKV.
batch	A batch.

j_kv_get()

void j_kv_get	(	JKV *	kv,
		gpointer *	value,
		guint32 *	value_len,
		JBatch *	batch
	)

Get a key-value pair.

Parameters

kv	A KV.
value	A pointer for the returned value buffer.
value_len	A pointer to the length of the returned value buffer.
batch	A batch.

j_kv_get_backend()

JBackend * j_kv_get_backend

(

void

)

Returns the kv backend.

Returns

The kv backend.

j_kv_get_callback()

void j_kv_get_callback	(	JKV *	kv,
		JKVGetFunc	func,
		gpointer	data,
		JBatch *	batch
	)

Get a key-value pair and execute a callback function once the pair is received.

Parameters

kv	A key-value pair.
func	The callback function. Will be called even if no KV is found (with value == NULL and len == 0).
data	User defined data which will be passed to the callback function.
batch	A batch.

j_kv_new()

JKV * j_kv_new	(	gchar const *	namespace,
		gchar const *	key
	)

Creates a new key-value pair.

JKV* i;
 
i = j_kv_new("JULEA", "KEY");

Parameters

namespace	Namespace to create the key-value pair in.
key	A key-value pair key.

Returns

A new key-value pair. Should be freed with j_kv_unref().

j_kv_new_for_index()

JKV * j_kv_new_for_index	(	guint32	index,
		gchar const *	namespace,
		gchar const *	key
	)

Creates a new key-value pair on a specific KV-server.

JKV* i;
 
i = j_kv_new_for_index(0, "JULEA", "KEY");

Parameters

index	Index of the KV-server where the key-value pair should be stored.
namespace	Namespace to create the key-value pair in.
key	A key-value pair key.

Returns

A new key-value pair. Should be freed with j_kv_unref().

j_kv_put()

void j_kv_put	(	JKV *	kv,
		gpointer	value,
		guint32	value_len,
		GDestroyNotify	value_destroy,
		JBatch *	batch
	)

Creates a key-value pair.

Parameters

kv	A KV.
value	A value.
value_len	Length of value buffer.
value_destroy	A function to correctly free the stored data.
batch	A batch.

Todo:

key = index + namespace

j_kv_ref()

JKV * j_kv_ref

(

JKV *

kv

)

Increases a key-value pair's reference count.

JKV* i;
 
j_kv_ref(i);

Parameters

kv	A key-value pair.

Returns

key-value pair.

j_kv_unref()

void j_kv_unref

(

JKV *

kv

)

Decreases a key-value pair's reference count. When the reference count reaches zero, frees the memory allocated for the key-value pair.

Parameters

kv	A key-value pair.