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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 <vespa/config/helper/legacysubscriber.hpp>
namespace search {
template <typename ME, typename CFG>
class SubscriptionProxyNg : public config::IFetcherCallback<CFG>
{
typedef void (ME::*Method)(const CFG &cfg);
private:
ME &_target;
Method _method;
std::unique_ptr<config::LegacySubscriber> _subscriber;
vespalib::string _cfgId;
SubscriptionProxyNg(const SubscriptionProxyNg&);
SubscriptionProxyNg &operator=(const SubscriptionProxyNg&);
public:
SubscriptionProxyNg(ME &target, Method method)
: _target(target),
_method(method),
_subscriber(),
_cfgId("")
{
}
virtual ~SubscriptionProxyNg() {
unsubscribe();
}
const char *getConfigId() const {
return _cfgId.c_str();
}
void subscribe(const char *configId) {
if (_subscriber) {
if (configId != nullptr && strcmp(configId, _subscriber->id().c_str()) == 0)
{
return; // same id; ignore
} else {
unsubscribe();
}
}
if (configId != nullptr && configId[0] != '\0') {
_cfgId = configId;
_subscriber = std::make_unique<config::LegacySubscriber>();
_subscriber->subscribe<CFG>(configId, this);
}
}
void unsubscribe() {
_subscriber.reset();
_cfgId = "";
}
void configure(std::unique_ptr<CFG> cfg) override {
(_target.*_method)(*cfg);
}
};
} // namespace search
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