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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 "flushtargetproxy.h"
namespace vespalib { class Executor; }
namespace proton {
class IGetSerialNum;
/**
* Implements a flush target that runs initFlush() as a task in the given
* executor. This is used by the DocumentDB to ensure that initFlush() in the
* underlying flush targets are run in the updater thread.
*/
class ThreadedFlushTarget : public FlushTargetProxy
{
private:
using IFlushTarget = searchcorespi::IFlushTarget;
vespalib::Executor &_executor;
const IGetSerialNum &_getSerialNum;
public:
/**
* Constructs a new instance of this class. If the argument executor is
* the same as the one calling initFlush() on this object, make sure
* that it has more than 1 thread to avoid a deadlock.
*
* @param executor The executor to submit the task to.
* @param target The target to decorate.
*/
ThreadedFlushTarget(vespalib::Executor &executor,
const IGetSerialNum &getSerialNum,
const IFlushTarget::SP &target);
/**
* Constructs a new instance of this class. If the argument executor is
* the same as the one calling initFlush() on this object, make sure
* that it has more than 1 thread to avoid a deadlock.
*
* @param executor The executor to submit the task to.
* @param target The target to decorate.
* @param prefix The prefix to prepend to the target
*/
ThreadedFlushTarget(vespalib::Executor &executor,
const IGetSerialNum &getSerialNum,
const IFlushTarget::SP &target,
const vespalib::string & prefix);
Task::UP initFlush(SerialNum currentSerial, std::shared_ptr<search::IFlushToken> flush_token) override;
};
} // namespace proton
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