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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "threadedflushtarget.h"
#include <vespa/searchcore/proton/server/igetserialnum.h>
#include <vespa/vespalib/util/lambdatask.h>
#include <future>
#include <cassert>
using searchcorespi::IFlushTarget;
using searchcorespi::FlushStats;
using vespalib::makeLambdaTask;
namespace proton {
ThreadedFlushTarget::ThreadedFlushTarget(vespalib::Executor &executor,
const IGetSerialNum &getSerialNum,
const IFlushTarget::SP &target)
: FlushTargetProxy(target),
_executor(executor),
_getSerialNum(getSerialNum)
{
}
ThreadedFlushTarget::ThreadedFlushTarget(vespalib::Executor &executor,
const IGetSerialNum &getSerialNum,
const IFlushTarget::SP &target,
const vespalib::string & prefix)
: FlushTargetProxy(target, prefix),
_executor(executor),
_getSerialNum(getSerialNum)
{
}
namespace {
IFlushTarget::Task::UP
callInitFlush(IFlushTarget *target, IFlushTarget::SerialNum serial,
const IGetSerialNum *getSerialNum, std::shared_ptr<search::IFlushToken> flush_token) {
// Serial number from flush engine might have become stale, obtain
// a fresh serial number now.
(void) serial;
search::SerialNum freshSerial = getSerialNum->getSerialNum();
assert(freshSerial >= serial);
return target->initFlush(freshSerial, std::move(flush_token));
}
} // namespace
IFlushTarget::Task::UP
ThreadedFlushTarget::initFlush(SerialNum currentSerial, std::shared_ptr<search::IFlushToken> flush_token)
{
std::promise<Task::UP> promise;
std::future<Task::UP> future = promise.get_future();
_executor.execute(makeLambdaTask([&]() {
promise.set_value(callInitFlush(_target.get(), currentSerial, &_getSerialNum, flush_token));
}));
return future.get();
}
} // namespace proton
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