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/**
* Copyright (C) 2020-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <string>
#include <vector>
#include "mongo/db/repl/abstract_async_component.h"
#include "mongo/db/repl/oplog_buffer.h"
#include "mongo/db/repl/oplog_entry.h"
#include "mongo/util/future.h"
namespace mongo {
namespace repl {
struct TenantOplogEntry {
TenantOplogEntry() = default;
explicit TenantOplogEntry(OplogEntry&& in_entry) : entry(in_entry) {}
TenantOplogEntry(OplogEntry&& in_entry, int in_expansionsEntry)
: entry(in_entry), expansionsEntry(in_expansionsEntry) {}
OplogEntry entry;
// If this entry is a transaction commit or applyOps, the index within the
// TenantOplogBatch::expansions array containing the oplog entries it expands to.
int expansionsEntry = -1;
};
struct TenantOplogBatch {
std::vector<TenantOplogEntry> ops;
std::vector<std::vector<OplogEntry>> expansions;
};
/**
* This class consumes batches of oplog entries from the RandomAccessOplogBuffer to give to the
* tenant oplog applier. It expands transactions into their individual ops and keeps them together
* in a single batch. The original transaction information is included in the batch.
*/
class TenantOplogBatcher : public AbstractAsyncComponent,
public std::enable_shared_from_this<TenantOplogBatcher> {
public:
class BatchLimits {
public:
BatchLimits() = default;
BatchLimits(size_t in_bytes, size_t in_ops) : bytes(in_bytes), ops(in_ops) {}
size_t bytes = 0;
size_t ops = 0;
};
TenantOplogBatcher(const std::string& tenantId,
RandomAccessOplogBuffer* oplogBuffer,
std::shared_ptr<executor::TaskExecutor> executor,
const Timestamp resumeBatchingTs);
virtual ~TenantOplogBatcher();
/**
* Returns a future for the next oplog batch. Client must not ask for another batch until
* the Future is ready.
*/
SemiFuture<TenantOplogBatch> getNextBatch(BatchLimits limits);
private:
SemiFuture<TenantOplogBatch> _scheduleNextBatch(WithLock, BatchLimits limits);
StatusWith<TenantOplogBatch> _readNextBatch(BatchLimits limits);
void _consume(OperationContext* opCtx);
void _pushEntry(OperationContext* opCtx, TenantOplogBatch* batch, OplogEntry&& op);
Status _doStartup_inlock() noexcept final;
void _doShutdown_inlock() noexcept final;
void _preJoin() noexcept final {}
Mutex* _getMutex() noexcept final {
return &_mutex;
}
Mutex _mutex = MONGO_MAKE_LATCH("TenantOplogBatcher::_mutex");
// All member variables are labeled with one of the following codes indicating the
// synchronization rules for accessing them.
//
// (R) Read-only in concurrent operation; no synchronization required.
// (S) Self-synchronizing; access according to class's own rules.
// (M) Reads and writes guarded by _mutex
// (X) Access only allowed from the main flow of control called from run() or constructor.
RandomAccessOplogBuffer* _oplogBuffer; // (S)
bool _batchRequested = false; // (M)
std::shared_ptr<executor::TaskExecutor> _executor; // (R)
const Timestamp _resumeBatchingTs; // (R)
};
} // namespace repl
} // namespace mongo
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