com.exonum.binding.storage.database

Class MemoryDb

java.lang.Object

com.exonum.binding.proxy.AbstractNativeProxy

com.exonum.binding.proxy.AbstractCloseableNativeProxy

com.exonum.binding.storage.database.MemoryDb

All Implemented Interfaces:

CloseableNativeProxy, Database, java.lang.AutoCloseable

public final class MemoryDb
extends AbstractCloseableNativeProxy
implements Database

An in-memory database for testing purposes. It can create both read-only snapshots and read-write forks. The changes made to database forks can be applied to the database state.

Field Summary

Fields inherited from class com.exonum.binding.proxy.AbstractNativeProxy

nativeHandle

Method Summary

Modifier and Type	Method and Description
Fork	createFork(Cleaner cleaner) Creates a new database fork.
Snapshot	createSnapshot(Cleaner cleaner) Creates a new snapshot of the database state.
protected void	disposeInternal() Releases any resources owned by this proxy (e.g., the corresponding native object).
void	merge(Fork fork) Applies the changes from the given fork to the database state.
static MemoryDb	newInstance() Creates a new empty MemoryDb.

Methods inherited from class com.exonum.binding.proxy.AbstractCloseableNativeProxy

close, getNativeHandle

Methods inherited from class com.exonum.binding.proxy.AbstractNativeProxy

isValidHandle

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.exonum.binding.proxy.CloseableNativeProxy

close

Method Detail

newInstance

public static MemoryDb newInstance()

Creates a new empty MemoryDb.

createSnapshot

public Snapshot createSnapshot(Cleaner cleaner)

Description copied from interface: Database

Creates a new snapshot of the database state.

Specified by:

createSnapshot in interface Database

Parameters:

cleaner - a cleaner to register the snapshot

Returns:

a new snapshot of the database state

createFork

public Fork createFork(Cleaner cleaner)

Description copied from interface: Database

Creates a new database fork.

A fork allows to perform a transaction: a number of independent writes to a database, which then may be atomically applied to the database.

Specified by:

createFork in interface Database

Parameters:

cleaner - a cleaner to register the fork

Returns:

a new database fork

merge

public void merge(Fork fork)

Applies the changes from the given fork to the database state.

Parameters:

fork - a fork to get changes from

disposeInternal

protected void disposeInternal()

Description copied from class: AbstractCloseableNativeProxy

Releases any resources owned by this proxy (e.g., the corresponding native object).

This method is only called once from AbstractCloseableNativeProxy.close() for a valid proxy and shall not be called directly.

Specified by:

disposeInternal in class AbstractCloseableNativeProxy