/// <summary>
/// Set the database entry for "key" to "value".
/// Note: consider setting new WriteOptions{ Sync = true }.
/// </summary>
public void Put(int key, int[] value, WriteOptions options)
{
IntPtr error;
LevelDbInterop.leveldb_put(Handle, options.Handle, ref key, (IntPtr)sizeof(int), value, checked ((IntPtr)(value.LongLength * 4)), out error);
Throw(error);
}
/// <summary>
/// Set the database entry for "key" to "value".
/// Note: consider setting new WriteOptions{ Sync = true }.
/// </summary>
public void Put(byte[] key, byte[] value, WriteOptions options)
{
IntPtr error;
LevelDbInterop.leveldb_put(Handle, options.Handle, key, (IntPtr)key.LongLength, value, (IntPtr)value.LongLength, out error);
Throw(error);
}
protected override void FreeUnManagedObjects()
{
if (Handle != default(IntPtr))
{
LevelDbInterop.leveldb_options_destroy(Handle);
}
}
public void Write(WriteBatch batch, WriteOptions options)
{
IntPtr error;
LevelDbInterop.leveldb_write(Handle, options.Handle, batch.Handle, out error);
Throw(error);
}
/// <summary>
/// If a DB cannot be opened, you may attempt to call this method to
/// resurrect as much of the contents of the database as possible.
/// Some data may be lost, so be careful when calling this function
/// on a database that contains important information.
/// </summary>
public static void Repair(Options options, string name)
{
IntPtr error;
LevelDbInterop.leveldb_repair_db(options.Handle, name, out error);
Throw(error);
}
/// <summary>
/// Destroy the contents of the specified database.
/// Be very careful using this method.
/// </summary>
public static void Destroy(Options options, string name)
{
IntPtr error;
LevelDbInterop.leveldb_destroy_db(options.Handle, name, out error);
Throw(error);
}
/// <summary>
/// Remove the database entry (if any) for "key".
/// It is not an error if "key" did not exist in the database.
/// Note: consider setting new WriteOptions{ Sync = true }.
/// </summary>
public void Delete(byte[] key, WriteOptions options)
{
IntPtr error;
LevelDbInterop.leveldb_delete(Handle, options.Handle, key, (IntPtr)key.LongLength, out error);
Throw(error);
}
protected override void FreeUnManagedObjects()
{
if (Handle != default)
{
// indirectly invoked CleanupInner
LevelDbInterop.leveldb_comparator_destroy(Handle);
}
}
protected override void FreeUnManagedObjects()
{
LevelDb parent;
if (Parent.TryGetTarget(out parent))
{
LevelDbInterop.leveldb_release_snapshot(parent.Handle, Handle);
}
}
protected override bool ReleaseHandle()
{
if (handle != default)
{
LevelDbInterop.leveldb_free(handle);
}
handle = default;
return(true);
}
/// <summary>
/// Open the database with the specified "name".
/// </summary>
public LevelDb(Options options, string name)
{
IntPtr error;
_cache = options.Cache;
_comparator = options.Comparator;
Handle = LevelDbInterop.leveldb_open(options.Handle, name, out error);
Throw(error, msg => new UnauthorizedAccessException(msg));
}
/// <summary>
/// If an error has occurred, throw it.
/// </summary>
void Throw(Func <string, Exception> exception)
{
IntPtr error;
LevelDbInterop.leveldb_iter_get_error(Handle, out error);
if (error != IntPtr.Zero)
{
throw exception(Marshal.PtrToStringAnsi(error));
}
}
protected override void FreeUnManagedObjects()
{
if (Handle != default(IntPtr))
{
LevelDbInterop.leveldb_close(Handle);
}
// it's critical that the database be closed first, as the logger and cache may depend on it.
_cache?.Dispose();
_comparator?.Dispose();
}
/// <summary>
/// Return the key for the current entry.
/// REQUIRES: Valid()
/// </summary>
public byte[] Key()
{
int length;
var key = LevelDbInterop.leveldb_iter_key(Handle, out length);
Throw();
var bytes = new byte[length];
Marshal.Copy(key, bytes, 0, length);
return(bytes);
}
/// <summary>
/// Return the value for the current entry.
/// REQUIRES: Valid()
/// </summary>
public byte[] Value()
{
int length;
var value = LevelDbInterop.leveldb_iter_value(Handle, out length);
Throw();
var bytes = new byte[length];
Marshal.Copy(value, bytes, 0, length);
return(bytes);
}
static void Throw(IntPtr error, Func <string, Exception> exception)
{
if (error != IntPtr.Zero)
{
try {
var msg = Marshal.PtrToStringAnsi(error);
throw exception(msg);
} finally {
LevelDbInterop.leveldb_free(error);
}
}
}
/// <summary>
/// Return the key for the current entry.
/// REQUIRES: Valid()
/// </summary>
public int KeyAsInt()
{
int length;
var key = LevelDbInterop.leveldb_iter_key(Handle, out length);
Throw();
if (length != 4)
{
throw new Exception("Key is not an integer");
}
return(Marshal.ReadInt32(key));
}
/// <summary>
/// DB implementations can export properties about their state
/// via this method. If "property" is a valid property understood by this
/// DB implementation, fills "*value" with its current value and returns
/// true. Otherwise returns false.
///
/// Valid property names include:
///
/// "leveldb.num-files-at-level<N>" - return the number of files at level <N>,
/// where <N> is an ASCII representation of a level number (e.g. "0").
/// "leveldb.stats" - returns a multi-line string that describes statistics
/// about the internal operation of the DB.
/// </summary>
public string PropertyValue(string name)
{
var ptr = LevelDbInterop.leveldb_property_value(Handle, name);
if (ptr == IntPtr.Zero)
{
return(null);
}
try {
return(Marshal.PtrToStringAnsi(ptr));
} finally {
LevelDbInterop.leveldb_free(ptr);
}
}
public NativeArray <T> GetRaw <T>(NativeArray key, ReadOptions options) where T : struct
{
IntPtr error;
IntPtr length;
var handle = new LevelDbFreeHandle();
// TODO: Remove typecast to int
var v = (Ptr <T>)LevelDbInterop.leveldb_get(
Handle,
options.Handle,
key.BaseAddr,
key.ByteLength,
out length,
out error);
handle.SetHandle((IntPtr)v);
// round down, truncating the array slightly if needed
var count = (IntPtr)((ulong)length / Ptr <T> .SizeofT);
return(new NativeArray <T>(v, count, handle));
}
/// <summary>
/// If the database contains an entry for "key" return the value,
/// otherwise return null.
/// </summary>
public byte[] Get(byte[] key, ReadOptions options)
{
IntPtr error;
IntPtr length;
var v = LevelDbInterop.leveldb_get(Handle, options.Handle, key, (IntPtr)key.LongLength, out length, out error);
Throw(error);
if (v == IntPtr.Zero)
{
return(null);
}
try {
var bytes = new byte[(long)length];
// TODO: Consider copy loop, as Marshal.Copy has 2GB-1 limit, or native pointers
Marshal.Copy(v, bytes, 0, (int)length);
return(bytes);
} finally {
LevelDbInterop.leveldb_free(v);
}
}
public IntPtr Init(string name, Func <NativeArray, NativeArray, int> cmp)
{
// TODO: Complete member initialization
_cmp = cmp;
_namePinned = GCHandle.Alloc(
Encoding.ASCII.GetBytes(name),
GCHandleType.Pinned);
var thisHandle = GCHandle.Alloc(this);
var chandle = LevelDbInterop.leveldb_comparator_create(
GCHandle.ToIntPtr(thisHandle),
Marshal.GetFunctionPointerForDelegate(DestructorInstance),
Marshal.GetFunctionPointerForDelegate(CompareInstance),
Marshal.GetFunctionPointerForDelegate(NameAccessor));
if (chandle == default)
{
thisHandle.Free();
}
return(chandle);
}
/// <summary>
/// If the database contains an entry for "key" return the value,
/// otherwise return null.
/// </summary>
public int[] Get(int key, ReadOptions options)
{
IntPtr error;
IntPtr length;
IntPtr v;
v = LevelDbInterop.leveldb_get(Handle, options.Handle, ref key, (IntPtr)sizeof(int), out length, out error);
Throw(error);
if (v == IntPtr.Zero)
{
return(null);
}
try {
var bytes = new int[(long)length / 4];
// TODO: consider >2GB-1
Marshal.Copy(v, bytes, 0, checked ((int)bytes.LongLength));
return(bytes);
} finally {
LevelDbInterop.leveldb_free(v);
}
}
/// <summary>
/// Position at the first key in the source that at or past target
/// The iterator is Valid() after this call iff the source contains
/// an entry that comes at or past target.
/// </summary>
public void Seek(byte[] key)
{
LevelDbInterop.leveldb_iter_seek(Handle, key, key.Length);
Throw();
}
/// <summary>
/// Position at the last key in the source.
/// The iterator is Valid() after this call iff the source is not empty.
/// </summary>
public void SeekToLast()
{
LevelDbInterop.leveldb_iter_seek_to_last(Handle);
Throw();
}
/// <summary>
/// Moves to the next entry in the source.
/// After this call, Valid() is true iff the iterator was not positioned at the last entry in the source.
/// REQUIRES: Valid()
/// </summary>
public void Next()
{
LevelDbInterop.leveldb_iter_next(Handle);
Throw();
}
/// <summary>
/// An iterator is either positioned at a key/value pair, or
/// not valid.
/// </summary>
/// <returns>This method returns true iff the iterator is valid.</returns>
public bool IsValid()
{
return(LevelDbInterop.leveldb_iter_valid(Handle) != 0);
}
protected override void FreeUnManagedObjects()
{
LevelDbInterop.leveldb_iter_destroy(Handle);
}
/// <summary>
/// Position at the first key in the source that at or past target
/// The iterator is Valid() after this call iff the source contains
/// an entry that comes at or past target.
/// </summary>
public void Seek(int key)
{
LevelDbInterop.leveldb_iter_seek(Handle, ref key, 4);
Throw();
}
/// <summary>
/// Return a handle to the current DB state.
/// Iterators and Gets created with this handle will all observe a stable snapshot of the current DB state.
/// </summary>
public SnapShot CreateSnapshot()
{
return(new SnapShot(LevelDbInterop.leveldb_create_snapshot(Handle), this));
}
/// <summary>
/// Return an iterator over the contents of the database.
/// The result of CreateIterator is initially invalid (caller must
/// call one of the Seek methods on the iterator before using it).
/// </summary>
public Iterator CreateIterator(ReadOptions options)
{
return(new Iterator(LevelDbInterop.leveldb_create_iterator(Handle, options.Handle)));
}
