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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "i_thread_service.h"
#include <vespa/vespalib/util/syncable.h>
namespace vespalib { class ISequencedTaskExecutor; }
namespace searchcorespi::index {
/**
* Interface for the thread model used for write tasks.
*
* We have multiple write threads:
*
* 1. The master write thread used for the majority of write tasks.
*
* 2. The index write thread used for doing changes to the memory
* index, either directly (for data not bound to a field) or via
* index field inverter executor or index field writer executor.
*
* 3. The index field inverter executor is used to populate field
* inverters with data from document fields. Scheduled tasks for
* the same field are executed in sequence.
*
* 4. The index field writer executor is used to sort data in field
* inverters before pushing the data to the memory field indexes.
* Scheduled tasks for the same field are executed in sequence.
*
* The master write thread is always the one giving tasks to the index
* write thread.
*
* The index write thread extracts fields from documents and gives
* task to the index field inverter executor and the index field
* writer executor.
*
* The index field inverter executor and index field writer executor
* are separate to allow for double buffering, i.e. populate one set
* of field inverters using the index field inverter executor while
* another set of field inverters are handled by the index field
* writer executor.
*
* We might decide to allow index field inverter tasks to schedule
* tasks to the index field writer executor, so draining logic needs
* to sync index field inverter executor before syncing index field
* writer executor.
*/
struct IThreadingService : public vespalib::Syncable
{
IThreadingService(const IThreadingService &) = delete;
IThreadingService & operator = (const IThreadingService &) = delete;
IThreadingService() = default;
virtual ~IThreadingService() {}
virtual IThreadService &master() = 0;
virtual IThreadService &index() = 0;
virtual IThreadService &summary() = 0;
virtual vespalib::ThreadExecutor &shared() = 0;
virtual vespalib::ISequencedTaskExecutor &indexFieldInverter() = 0;
virtual vespalib::ISequencedTaskExecutor &indexFieldWriter() = 0;
virtual vespalib::ISequencedTaskExecutor &attributeFieldWriter() = 0;
};
}
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