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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "prepare_restart_handler.h"
#include <vespa/searchcore/proton/flushengine/flushengine.h>
#include <vespa/searchcore/proton/flushengine/prepare_restart_flush_strategy.h>
#include <vespa/log/log.h>
LOG_SETUP(".proton.server.prepare_restart_handler");
namespace proton {
PrepareRestartHandler::PrepareRestartHandler(FlushEngine &flushEngine)
: _flushEngine(flushEngine),
_mutex(),
_cond(),
_running(false)
{
}
bool
PrepareRestartHandler::prepareRestart(const ProtonConfig &protonCfg)
{
std::unique_lock lock(_mutex);
if (!_flushEngine.has_thread()) {
return false;
}
if (!_running) {
performPrepareRestart(protonCfg, lock);
} else {
_cond.wait(lock, [this] { return !_running; });
LOG(info, "prepareRestart(): Waited for another thread performing prepareRestart()");
}
return true;
}
namespace {
PrepareRestartFlushStrategy::Config
createPrepareRestartConfig(const PrepareRestartHandler::ProtonConfig &protonCfg)
{
return PrepareRestartFlushStrategy::Config(protonCfg.flush.preparerestart.replaycost,
protonCfg.flush.preparerestart.replayoperationcost,
protonCfg.flush.preparerestart.writecost);
}
}
void
PrepareRestartHandler::performPrepareRestart(const ProtonConfig &protonCfg, std::unique_lock<std::mutex> &lock)
{
_running = true;
lock.unlock();
_flushEngine.setStrategy(std::make_shared<PrepareRestartFlushStrategy>(createPrepareRestartConfig(protonCfg)));
lock.lock();
_running = false;
_cond.notify_all();
}
}
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