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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 <vespa/messagebus/iprotocol.h>
#include <map>
namespace mbus {
class SimpleProtocol : public IProtocol {
public:
/**
* Defines a policy factory interface that tests can use to register arbitrary policies with this protocol.
*/
class IPolicyFactory {
public:
/**
* Convenience typedefs.
*/
using SP = std::shared_ptr<IPolicyFactory>;
/**
* Required for inheritance.
*/
virtual ~IPolicyFactory() { }
/**
* Creates a new isntance of the routing policy that this factory encapsulates.
*
* @param param The param for the policy constructor.
* @return The routing policy created.
*/
virtual IRoutingPolicy::UP create(const string ¶m) = 0;
};
private:
using FactoryMap = std::map<string, IPolicyFactory::SP>;
FactoryMap _policies;
public:
static const string NAME;
static const uint32_t MESSAGE;
static const uint32_t REPLY;
/**
* Constructs a new simple protocol. This registers policy factories for both {@link SimpleAllPolicy} and
* {@link SimpleHashPolicy}.
*/
SimpleProtocol();
~SimpleProtocol();
/**
* Registers a policy factory with this protocol under a given name. Whenever a policy is requested that
* matches this name, the factory is invoked.
*
* @param name The name of the policy.
* @param factory The policy factory.
*/
void addPolicyFactory(const string &name,
IPolicyFactory::SP factory);
/**
* Common merge logic that can be used for any simple policy. It all errors across all replies into
* a new {@link EmptyReply}.
*
* @param ctx The routing context whose children to merge.
*/
static void simpleMerge(RoutingContext &ctx);
const string & getName() const override;
IRoutingPolicy::UP createPolicy(const string &name, const string ¶m) const override;
Blob encode(const vespalib::Version &version, const Routable &routable) const override;
Routable::UP decode(const vespalib::Version &version, BlobRef data) const override;
};
} // namespace mbus
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