foundationdb/bindings/flow/DirectoryLayer.h

135 lines
5.2 KiB
C
Raw Normal View History

2017-05-26 04:48:44 +08:00
/*
* DirectoryLayer.h
*
* This source file is part of the FoundationDB open source project
*
2022-03-22 04:36:23 +08:00
* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
*
2017-05-26 04:48:44 +08:00
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
2017-05-26 04:48:44 +08:00
* http://www.apache.org/licenses/LICENSE-2.0
*
2017-05-26 04:48:44 +08:00
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef FDB_FLOW_DIRECTORY_LAYER_H
#define FDB_FLOW_DIRECTORY_LAYER_H
#pragma once
#include "IDirectory.h"
#include "DirectorySubspace.h"
#include "HighContentionAllocator.h"
namespace FDB {
class DirectoryLayer : public IDirectory {
public:
DirectoryLayer(Subspace nodeSubspace = DEFAULT_NODE_SUBSPACE,
Subspace contentSubspace = DEFAULT_CONTENT_SUBSPACE,
bool allowManualPrefixes = false);
Future<Reference<DirectorySubspace>> create(
Reference<Transaction> const& tr,
Path const& path,
Standalone<StringRef> const& layer = Standalone<StringRef>(),
Optional<Standalone<StringRef>> const& prefix = Optional<Standalone<StringRef>>());
Future<Reference<DirectorySubspace>> open(Reference<Transaction> const& tr,
Path const& path,
Standalone<StringRef> const& layer = Standalone<StringRef>());
Future<Reference<DirectorySubspace>> createOrOpen(Reference<Transaction> const& tr,
Path const& path,
Standalone<StringRef> const& layer = Standalone<StringRef>());
Future<bool> exists(Reference<Transaction> const& tr, Path const& path = Path());
Future<Standalone<VectorRef<StringRef>>> list(Reference<Transaction> const& tr, Path const& path = Path());
Future<Reference<DirectorySubspace>> move(Reference<Transaction> const& tr,
Path const& oldPath,
Path const& newPath);
Future<Reference<DirectorySubspace>> moveTo(Reference<Transaction> const& tr, Path const& newAbsolutePath);
Future<Void> remove(Reference<Transaction> const& tr, Path const& path = Path());
Future<bool> removeIfExists(Reference<Transaction> const& tr, Path const& path = Path());
Reference<DirectoryLayer> getDirectoryLayer();
const Standalone<StringRef> getLayer() const;
const Path getPath() const;
static const Subspace DEFAULT_NODE_SUBSPACE;
static const Subspace DEFAULT_CONTENT_SUBSPACE;
static const StringRef PARTITION_LAYER;
// private:
static const uint8_t LITTLE_ENDIAN_LONG_ONE[8];
static const StringRef HIGH_CONTENTION_KEY;
static const StringRef LAYER_KEY;
static const StringRef VERSION_KEY;
static const int64_t SUB_DIR_KEY;
static const uint32_t VERSION[3];
static const StringRef DEFAULT_NODE_SUBSPACE_PREFIX;
struct Node {
Node() {}
Node(Reference<DirectoryLayer> const& directoryLayer,
Optional<Subspace> const& subspace,
Path const& path,
Path const& targetPath);
bool exists() const;
Future<Node> loadMetadata(Reference<Transaction> tr);
void ensureMetadataLoaded() const;
bool isInPartition(bool includeEmptySubpath = false) const;
Path getPartitionSubpath() const;
Reference<DirectorySubspace> getContents() const;
Reference<DirectoryLayer> directoryLayer;
Optional<Subspace> subspace;
2017-05-26 04:48:44 +08:00
Path path;
Path targetPath;
Standalone<StringRef> layer;
bool loadedMetadata;
2017-05-26 04:48:44 +08:00
};
Reference<DirectorySubspace> openInternal(Standalone<StringRef> const& layer,
Node const& existingNode,
bool allowOpen);
Future<Reference<DirectorySubspace>> createOrOpenInternal(Reference<Transaction> const& tr,
Path const& path,
Standalone<StringRef> const& layer,
Optional<Standalone<StringRef>> const& prefix,
bool allowCreate,
bool allowOpen);
void initializeDirectory(Reference<Transaction> const& tr) const;
Future<Void> checkVersion(Reference<Transaction> const& tr, bool writeAccess) const;
template <class T>
Optional<Subspace> nodeWithPrefix(Optional<T> const& prefix) const;
Subspace nodeWithPrefix(StringRef const& prefix) const;
Reference<DirectorySubspace> contentsOfNode(Subspace const& node,
Path const& path,
Standalone<StringRef> const& layer);
Path toAbsolutePath(Path const& subpath) const;
Subspace rootNode;
Subspace nodeSubspace;
Subspace contentSubspace;
HighContentionAllocator allocator;
bool allowManualPrefixes;
Path path;
};
} // namespace FDB
2017-05-26 04:48:44 +08:00
#endif