Class DefaultKeyValueStore

The default built-in IKeyValueStore implementation. This stores data in the file system or in memory.

DefaultStore and DefaultKeyValueStore-backed TrieStateStore can be instantiated from a URI with default+file: scheme using LoadStore(Uri), e.g.:

default+file:///var/data/planet/
default+file:///c:/Users/john/AppData/Local/planet/
default+file:///var/data/planet/?secure=true (trie keys are hashed)

The following query string parameters are supported:

`journal`	`true` (default) or `false`. Corresponds to DefaultStore(String, Boolean, Int32, Int32, Int32, Boolean, Boolean)'s `journal` parameter.
`index-cache`	Corresponds to DefaultStore(String, Boolean, Int32, Int32, Int32, Boolean, Boolean)'s `indexCacheSize` parameter. 50000 by default.
`block-cache`	Corresponds to DefaultStore(String, Boolean, Int32, Int32, Int32, Boolean, Boolean)'s `blockCacheSize` parameter. 512 by default.
`tx-cache`	Corresponds to DefaultStore(String, Boolean, Int32, Int32, Int32, Boolean, Boolean)'s `txCacheSize` parameter. 1024 by default.
`flush`	`true` (default) or `false`. Corresponds to DefaultStore(String, Boolean, Int32, Int32, Int32, Boolean, Boolean)'s `flush` parameter.
`readonly`	`true` or `false` (default). Corresponds to DefaultStore(String, Boolean, Int32, Int32, Int32, Boolean, Boolean)'s `readOnly` parameter.
`states-dir`	Corresponds to 's `path` parameter. It is relative to the URI path, and defaults to `states`.
`secure`	`true` or `false` (default). Corresponds to TrieStateStore(IKeyValueStore, Boolean)'s `secure` parameter.

Inheritance

Object

DefaultKeyValueStore

Implements

IKeyValueStore

IDisposable

Namespace: Libplanet.Store.Trie

Assembly: Libplanet.dll

Syntax

public class DefaultKeyValueStore : object, IKeyValueStore, IDisposable

Constructors

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DefaultKeyValueStore(Nullable<String>)

Creates a new DefaultKeyValueStore.

Declaration

public DefaultKeyValueStore(string? path)

Parameters

Type	Name	Description
Nullable<String>	path	The path of the directory where the storage files will be saved. If the path is `null`, the database is created in memory.

Methods

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Delete(IEnumerable<KeyBytes>)

Delete multiple keys at once.

Declaration

public void Delete(IEnumerable<KeyBytes> keys)

Parameters

Type	Name	Description
IEnumerable<KeyBytes>	keys	Keys to delete. The order of keys does not matter. Non-existent keys are ignored.

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Delete(in KeyBytes)

Deletes the given key. If the key does not exist, nothing happens.

Declaration

public void Delete(in KeyBytes key)

Parameters

Type	Name	Description
KeyBytes	key	A key to delete.

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Dispose()

Declaration

public void Dispose()

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Exists(in KeyBytes)

Checks whether the given key exists in the store.

Declaration

public bool Exists(in KeyBytes key)

Parameters

Type	Name	Description
KeyBytes	key	A key to check.

Returns

Type	Description
Boolean	true if the key exists; otherwise, false.

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Get(IEnumerable<KeyBytes>)

Gets multiple values associated with the specified keys at once.

Declaration

public IReadOnlyDictionary<KeyBytes, byte[]> Get(IEnumerable<KeyBytes> keys)

Parameters

Type	Name	Description
IEnumerable<KeyBytes>	keys	Keys whose values to get. The order of keys does not matter. Duplicate keys after their first occurrence are ignored.

Returns

Type	Description
IReadOnlyDictionary<KeyBytes, Byte[]>	Values associated the specified `keys`. Non-existent `keys` are omitted (rather than being filled with null).

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Get(in KeyBytes)

Gets the value associated with the specified key.

Declaration

public byte[] Get(in KeyBytes key)

Parameters

Type	Name	Description
KeyBytes	key	The key whose value to get.

Returns

Type	Description
Byte[]	The value associated with the specified key.

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ListKeys()

Lists all keys that have been stored in the storage.

Declaration

public IEnumerable<KeyBytes> ListKeys()

Returns

Type	Description
IEnumerable<KeyBytes>	All keys in an arbitrary order. The order might be vary for each call.

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Set(IDictionary<KeyBytes, Byte[]>)

Declaration

public void Set(IDictionary<KeyBytes, byte[]> values)

Parameters

Type	Name	Description
IDictionary<KeyBytes, Byte[]>	values

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Set(in KeyBytes, Byte[])

Sets the value to the key. If the key already exists, the value is overwritten.

Declaration

public void Set(in KeyBytes key, byte[] value)

Parameters

Type	Name	Description
KeyBytes	key	The key of the value to set.
Byte[]	value	The value to set.

Implements

IKeyValueStore

IDisposable