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/

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 DefaultKeyValueStore(String)'s `path` parameter. It is relative to the URI path, and defaults to `states`.

Inheritance

Object

DefaultKeyValueStore

Implements

IKeyValueStore

IDisposable

Inherited Members

Object.Equals(Object)

Object.Equals(Object, Object)

Object.GetHashCode()

System.Object.GetType()

Object.MemberwiseClone()

Object.ReferenceEquals(Object, Object)

System.Object.ToString()

Namespace: Libplanet.Store.Trie

Assembly: Libplanet.Store.dll

Syntax

public class DefaultKeyValueStore : IKeyValueStore, IDisposable

Constructors

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DefaultKeyValueStore(String)

Creates a new DefaultKeyValueStore.

Declaration

public DefaultKeyValueStore(string path)

Parameters

Type	Name	Description
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(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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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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Dispose()

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/

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 DefaultKeyValueStore(String)'s `path` parameter. It is relative to the URI path, and defaults to `states`.

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
System.Boolean	true if the key exists; otherwise, false.

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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
System.Byte[]	The value associated with the specified key.

Exceptions

Type	Condition
KeyNotFoundException	Thrown when the key is not found.

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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(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.
System.Byte[]	value	The value to set.

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Set(IDictionary<KeyBytes, Byte[]>)

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/

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 DefaultKeyValueStore(String)'s `path` parameter. It is relative to the URI path, and defaults to `states`.

Declaration

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

Parameters

Type	Name	Description
System.Collections.Generic.IDictionary<KeyBytes, System.Byte[]>	values

Implements

IKeyValueStore

System.IDisposable