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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "common.h"
#include "ichunk.h"
#include <vespa/vespalib/util/memory.h>
#include <map>
#include <vector>
#include <atomic>
#include <mutex>
class FastOS_FileInterface;
namespace search::common { class FileHeaderContext; }
namespace search::transactionlog {
class DomainPart {
public:
using SP = std::shared_ptr<DomainPart>;
DomainPart(const DomainPart &) = delete;
DomainPart& operator=(const DomainPart &) = delete;
DomainPart(const vespalib::string &name, const vespalib::string &baseDir, SerialNum s,
const common::FileHeaderContext &FileHeaderContext, bool allowTruncate);
~DomainPart();
const vespalib::string &fileName() const { return _fileName; }
void commit(const SerializedChunk & serialized);
bool erase(SerialNum to);
bool visit(FastOS_FileInterface &file, SerialNumRange &r, Packet &packet);
bool close();
void sync();
SerialNumRange range() const { return SerialNumRange(get_range_from(), get_range_to()); }
SerialNum getSynced() const {
std::lock_guard guard(_writeLock);
return _syncedSerial;
}
size_t size() const noexcept { return _sz.load(std::memory_order_relaxed); }
size_t byteSize() const {
return _byteSize.load(std::memory_order_acquire);
}
bool isClosed() const;
private:
using Alloc = vespalib::alloc::Alloc;
bool openAndFind(FastOS_FileInterface &file, const SerialNum &from);
int64_t buildPacketMapping(bool allowTruncate);
static Packet readPacket(FastOS_FileInterface & file, SerialNumRange wanted, size_t targetSize, bool allowTruncate);
static bool read(FastOS_FileInterface &file, IChunk::UP & chunk, Alloc &buf, bool allowTruncate);
void write(FastOS_FileInterface &file, SerialNumRange range, vespalib::ConstBufferRef buf);
void writeHeader(const common::FileHeaderContext &fileHeaderContext);
void set_size(size_t sz) noexcept { _sz.store(sz, std::memory_order_relaxed); }
SerialNum get_range_from() const noexcept { return _range_from.load(std::memory_order_relaxed); }
SerialNum get_range_to() const noexcept { return _range_to.load(std::memory_order_relaxed); }
void set_range_from(SerialNum range_from) noexcept { _range_from.store(range_from, std::memory_order_relaxed); }
void set_range_to(SerialNum range_to) noexcept { _range_to.store(range_to, std::memory_order_relaxed); }
class SkipInfo
{
public:
SkipInfo(SerialNum s, uint64_t p) noexcept : _id(s), _pos(p) {}
bool operator ==(const SkipInfo &b) const noexcept { return cmp(b) == 0; }
bool operator <(const SkipInfo &b) const noexcept { return cmp(b) < 0; }
bool operator >(const SkipInfo &b) const noexcept { return cmp(b) > 0; }
bool operator <=(const SkipInfo &b) const noexcept { return cmp(b) <= 0; }
bool operator >=(const SkipInfo &b) const noexcept { return cmp(b) >= 0; }
int64_t filePos() const noexcept { return _pos; }
SerialNum id() const noexcept { return _id; }
private:
int64_t cmp(const SkipInfo & b) const noexcept { return _id - b._id; }
SerialNum _id;
uint64_t _pos;
};
std::mutex _lock;
std::mutex _fileLock;
std::atomic<SerialNum> _range_from;
std::atomic<SerialNum> _range_to;
std::atomic<size_t> _sz;
std::atomic<uint64_t> _byteSize;
vespalib::string _fileName;
std::unique_ptr<FastOS_FileInterface> _transLog;
std::vector<SkipInfo> _skipList;
uint32_t _headerLen;
mutable std::mutex _writeLock;
// Protected by _writeLock
SerialNum _writtenSerial;
SerialNum _syncedSerial;
};
}
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