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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 "isequencedtaskexecutor.h"
#include <vespa/vespalib/util/time.h>
#include <vespa/vespalib/util/runnable.h>
#include <optional>
namespace vespalib {
class ThreadExecutor;
class SyncableThreadExecutor;
/**
* Class to run multiple tasks in parallel, but tasks with same
* id has to be run in sequence.
*/
class SequencedTaskExecutor final : public ISequencedTaskExecutor
{
public:
using ISequencedTaskExecutor::getExecutorId;
using OptimizeFor = vespalib::Executor::OptimizeFor;
~SequencedTaskExecutor() override;
void setTaskLimit(uint32_t taskLimit) override;
void executeTask(ExecutorId id, vespalib::Executor::Task::UP task) override;
ExecutorId getExecutorId(uint64_t componentId) const override;
void sync_all() override;
ExecutorStats getStats() override;
void wakeup() override;
/**
* Returns the ExecutorStats of each underlying executor.
*
* Calling this function resets the statistics of each underlying executor,
* similar to calling getStats().
*/
std::vector<ExecutorStats> get_raw_stats();
static std::unique_ptr<ISequencedTaskExecutor>
create(Runnable::init_fun_t func, uint32_t threads);
static std::unique_ptr<ISequencedTaskExecutor>
create(Runnable::init_fun_t func, uint32_t threads, uint32_t taskLimit);
static std::unique_ptr<ISequencedTaskExecutor>
create(Runnable::init_fun_t func, uint32_t threads, uint32_t taskLimit, bool is_task_limit_hard, OptimizeFor optimize);
static std::unique_ptr<ISequencedTaskExecutor>
create(Runnable::init_fun_t func, uint32_t threads, uint32_t taskLimit,
bool is_task_limit_hard, OptimizeFor optimize, uint32_t kindOfWatermark);
/**
* For testing only
*/
uint32_t getComponentHashSize() const { return _component2IdImperfect.size(); }
uint32_t getComponentEffectiveHashSize() const { return _nextId; }
const vespalib::ThreadExecutor* first_executor() const;
private:
explicit SequencedTaskExecutor(std::vector<std::unique_ptr<vespalib::SyncableThreadExecutor>> executor);
std::optional<ExecutorId> getExecutorIdPerfect(uint64_t componentId) const;
ExecutorId getExecutorIdImPerfect(uint64_t componentId) const;
std::vector<std::unique_ptr<vespalib::SyncableThreadExecutor>> _executors;
using PerfectKeyT = uint16_t;
const bool _lazyExecutors;
mutable std::unique_ptr<PerfectKeyT[]> _component2IdPerfect;
mutable std::vector<uint8_t> _component2IdImperfect;
mutable std::mutex _mutex;
mutable uint32_t _nextId;
};
} // namespace search
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