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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "externslobrokpolicy.h"
#include <vespa/documentapi/messagebus/messages/wrongdistributionreply.h>
#include <vespa/vdslib/distribution/distribution.h>
#include <vespa/document/bucket/bucketidfactory.h>
#include <vespa/messagebus/routing/hop.h>
#include <shared_mutex>
namespace config {
class ICallback;
class ConfigFetcher;
}
namespace storage::lib {
class Distribution;
class ClusterState;
}
namespace documentapi {
class ContentPolicy : public ExternSlobrokPolicy
{
private:
document::BucketIdFactory _bucketIdFactory;
mutable std::shared_mutex _rw_lock;
std::shared_ptr<const storage::lib::ClusterState> _state;
string _clusterName;
string _clusterConfigId;
std::unique_ptr<config::ICallback> _callBack;
std::unique_ptr<config::ConfigFetcher> _configFetcher;
std::shared_ptr<const storage::lib::Distribution> _distribution;
using StateSnapshot = std::pair<std::shared_ptr<const storage::lib::ClusterState>,
std::shared_ptr<const storage::lib::Distribution>>;
// Acquires _lock
[[nodiscard]] StateSnapshot internal_state_snapshot();
mbus::Hop getRecipient(mbus::RoutingContext& context, int distributor);
// Acquires _lock
void updateStateFromReply(WrongDistributionReply& reply);
// Acquires _lock
void reset_state();
public:
explicit ContentPolicy(const string& param);
~ContentPolicy() override;
void doSelect(mbus::RoutingContext &context) override;
void merge(mbus::RoutingContext &context) override;
/**
* @return a pointer to the system state registered with this policy. If
* we haven't received a system state yet, returns nullptr.
*/
std::shared_ptr<const storage::lib::ClusterState> getSystemState() const noexcept;
virtual void configure(std::unique_ptr<storage::lib::Distribution::DistributionConfig> config);
string init() override;
private:
static string createConfigId(const string & clusterName);
static string createPattern(const string & clusterName, int distributor);
};
}
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