public void Snapshot()
{
// modify db
var writeOptions = LevelDBInterop.leveldb_writeoptions_create();
this.InnerPut(writeOptions, "key1", "value1");
LevelDBInterop.leveldb_writeoptions_destroy(writeOptions);
// create snapshot
var snapshot = LevelDBInterop.leveldb_create_snapshot(Database);
// modify db again
writeOptions = LevelDBInterop.leveldb_writeoptions_create();
this.InnerPut(writeOptions, "key2", "value2");
LevelDBInterop.leveldb_writeoptions_destroy(writeOptions);
// read from snapshot
var readOptions = LevelDBInterop.leveldb_readoptions_create();
LevelDBInterop.leveldb_readoptions_set_snapshot(readOptions, snapshot);
var val1 = this.InnerGet(readOptions, "key1");
Assert.Equal("value1", val1);
var val2 = this.InnerGet(readOptions, "key2");
Assert.Null(val2);
LevelDBInterop.leveldb_readoptions_destroy(readOptions);
// release snapshot
LevelDBInterop.leveldb_release_snapshot(Database, snapshot);
snapshot = IntPtr.Zero;
}
internal override void DestroyUnmanaged()
{
var parent = _parent.Target as LDB;
if (parent != null)
{
LevelDBInterop.leveldb_release_snapshot(parent._handle, _handle);
}
}
