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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* \class storage::ComponentRegisterImpl
* \ingroup component
*
* \brief Application server uses this class to manage components.
*
* This class implements set functions for the various implementations needed.
* It will set these implementations in all components already registered, and
* in components registered after that. Simplifies login in application server
* as it can just instantiate components in some order and set implementations
* as soon as they exist.
*
* It is possibly to subclass this implementation. That is useful if you also
* subclass component class to provide extra functionality. Then you can handle
* that extra functionality in the subclass.
*/
#pragma once
#include <vespa/storageframework/generic/component/componentregister.h>
#include <vespa/storageframework/generic/component/managedcomponent.h>
#include <vespa/storageframework/generic/metric/metricregistrator.h>
#include <vespa/storageframework/generic/status/statusreportermap.h>
#include <vespa/metrics/metricset.h>
#include <mutex>
namespace metrics {
class MetricManager;
class UpdateHook;
}
namespace storage::framework::defaultimplementation {
struct ShutdownListener {
virtual ~ShutdownListener() = default;
virtual void requestShutdown(vespalib::stringref reason) = 0;
};
class ComponentRegisterImpl : public virtual ComponentRegister,
public StatusReporterMap,
public MetricRegistrator
{
std::mutex _componentLock;
std::vector<ManagedComponent*> _components;
metrics::MetricSet _topMetricSet;
std::vector<std::unique_ptr<metrics::UpdateHook>> _hooks;
metrics::MetricManager* _metricManager;
Clock* _clock;
ThreadPool* _threadPool;
ShutdownListener* _shutdownListener;
public:
using UP = std::unique_ptr<ComponentRegisterImpl>;
ComponentRegisterImpl();
~ComponentRegisterImpl() override;
[[nodiscard]] bool hasMetricManager() const { return (_metricManager != nullptr); }
metrics::MetricManager& getMetricManager() { return *_metricManager; }
void registerComponent(ManagedComponent&) override;
void requestShutdown(vespalib::stringref reason) override;
void setMetricManager(metrics::MetricManager&);
void setClock(Clock&);
void setThreadPool(ThreadPool&);
const StatusReporter* getStatusReporter(vespalib::stringref id) override;
std::vector<const StatusReporter*> getStatusReporters() override;
void registerMetric(metrics::Metric&) override;
void registerUpdateHook(vespalib::stringref name, MetricUpdateHook& hook, vespalib::system_time::duration period) override;
void registerShutdownListener(ShutdownListener&);
};
}
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