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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 <vespa/searchlib/common/serialnum.h>
#include <vespa/vespalib/util/idestructorcallback.h>
#include <vespa/vespalib/objects/nbostream.h>
#include <vespa/vespalib/util/buffer.h>
#include <vespa/vespalib/util/time.h>
namespace search::transactionlog {
/// This represents a type of the entry. Fx update,remove
using Type = uint32_t;
class SerialNumRange
{
public:
SerialNumRange() : _from(0), _to(0) { }
explicit SerialNumRange(SerialNum f) : _from(f), _to(f ? f-1 : f) { }
SerialNumRange(SerialNum f, SerialNum t) : _from(f), _to(t) { }
bool operator == (const SerialNumRange & b) const { return cmp(b) == 0; }
bool operator < (const SerialNumRange & b) const { return cmp(b) < 0; }
bool operator > (const SerialNumRange & b) const { return cmp(b) > 0; }
bool operator <= (const SerialNumRange & b) const { return cmp(b) <= 0; }
bool operator >= (const SerialNumRange & b) const { return cmp(b) >= 0; }
SerialNum from() const { return _from; }
SerialNum to() const { return _to; }
void from(SerialNum v) { _from = v; }
void to(SerialNum v) { _to = v; }
bool contains(SerialNum s) const {
return (_from <= s) && (s <= _to);
}
bool contains(const SerialNumRange & b) const {
return (_from <= b._from) && (b._to <= _to);
}
private:
int64_t cmp(const SerialNumRange & b) const;
SerialNum _from;
SerialNum _to;
};
class Packet
{
public:
class Entry
{
public:
Entry() : _unique(0), _type(0), _valid(false), _data() { }
Entry(SerialNum u, Type t, const vespalib::ConstBufferRef & d)
: _unique(u),
_type(t),
_valid(true),
_data(d)
{ }
SerialNum serial() const { return _unique; }
Type type() const { return _type; }
bool valid() const { return _valid; }
size_t serializedSize() const { return sizeof(SerialNum) + sizeof(Type) + sizeof(uint32_t) + _data.size(); }
const vespalib::ConstBufferRef & data() const { return _data; }
vespalib::nbostream & deserialize(vespalib::nbostream & is);
vespalib::nbostream & serialize(vespalib::nbostream & os) const;
private:
SerialNum _unique;
Type _type;
bool _valid;
vespalib::ConstBufferRef _data;
};
public:
explicit Packet(size_t reserved) : _count(0), _range(), _buf(reserved) { }
Packet(const void * buf, size_t sz);
Packet(const Packet &) = delete;
Packet & operator =(const Packet &) = delete;
Packet(Packet &&) noexcept = default;
Packet & operator =(Packet &&) noexcept = default;
~Packet();
void add(const Entry & data);
void clear() { _buf.clear(); _count = 0; _range.from(0); _range.to(0); }
const SerialNumRange & range() const { return _range; }
const vespalib::nbostream & getHandle() const { return _buf; }
size_t size() const { return _count; }
bool empty() const { return _count == 0; }
size_t sizeBytes() const { return _buf.size(); }
void merge(const Packet & packet);
void shrinkToFit();
private:
size_t _count;
SerialNumRange _range;
vespalib::nbostream_longlivedbuf _buf;
};
int makeDirectory(const char * dir);
class Writer {
public:
using DoneCallback = std::shared_ptr<vespalib::IDestructorCallback>;
using DoneCallbacksList = std::vector<DoneCallback>;
using CommitPayload = std::shared_ptr<DoneCallbacksList>;
class CommitResult {
public:
CommitResult();
CommitResult(CommitPayload callBacks);
CommitResult(CommitResult &&) noexcept = default;
CommitResult & operator = (CommitResult &&) noexcept = default;
CommitResult(const CommitResult &) = delete;
CommitResult & operator = (const CommitResult &) = delete;
~CommitResult();
size_t getNumOperations() const { return _callBacks->size(); }
private:
CommitPayload _callBacks;
};
virtual ~Writer() = default;
virtual void append(const Packet & packet, DoneCallback done) = 0;
[[nodiscard]] virtual CommitResult startCommit(DoneCallback onDone) = 0;
};
class WriterFactory {
public:
virtual ~WriterFactory() = default;
virtual std::shared_ptr<Writer> getWriter(const vespalib::string & domainName) const = 0;
};
class Destination {
public:
virtual ~Destination() = default;
virtual bool send(int32_t id, const vespalib::string & domain, const Packet & packet) = 0;
virtual bool sendDone(int32_t id, const vespalib::string & domain) = 0;
virtual bool connected() const = 0;
virtual bool ok() const = 0;
};
class CommitChunk {
public:
CommitChunk(size_t reserveBytes, size_t reserveCount);
CommitChunk(size_t reserveBytes, Writer::CommitPayload postponed);
~CommitChunk();
bool empty() const { return _callBacks->empty(); }
void add(const Packet & packet, Writer::DoneCallback onDone);
size_t sizeBytes() const { return _data.sizeBytes(); }
const Packet & getPacket() const { return _data; }
Packet stealPacket() { return std::move(_data); }
size_t getNumCallBacks() const { return _callBacks->size(); }
Writer::CommitResult createCommitResult() const;
void setCommitDoneCallback(Writer::DoneCallback onDone) { _onCommitDone = std::move(onDone); }
Writer::CommitPayload stealCallbacks() { return std::move(_callBacks); }
void shrinkPayloadToFit();
private:
Packet _data;
Writer::CommitPayload _callBacks;
Writer::DoneCallback _onCommitDone;
};
}
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