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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 "monitorrequest.h"
#include "monitorreply.h"
namespace search::engine {
/**
* A monitor client is the object being notified of the completion of
* an asynchronous monitor operation.
**/
class MonitorClient
{
public:
/**
* Invoked by the monitor server to indicate the completion of an
* asynchronous monitor operation.
*
* @param reply the monitor reply
**/
virtual void pingDone(std::unique_ptr<MonitorReply> reply) = 0;
/**
* Empty, needed for subclassing
**/
virtual ~MonitorClient() {}
};
/**
* A monitor server is an object capable of performing a monitor
* operation.
**/
class MonitorServer
{
public:
/**
* Initiate a monitor operation that can be completed either
* synchronously or asynchronously. The return value will indicate
* whether the server selected to perform the operation
* synchronously or asynchronously. If the return value contains
* an object, then the operation completed synchronously and no
* further action will be taken by the server. If the return value
* did not contain an object, the operation will continue
* asynchronously, and the given client will be notified when the
* operation is completed. The server is not allowed to signal an
* asynchronous completion of the operation in the context of this
* method invocation.
*
* @return actual return value if sync, 'null' if async
* @param request object containing request parameters
* @param client the client to be notified of async completion
**/
virtual std::unique_ptr<MonitorReply> ping(std::unique_ptr<MonitorRequest> request, MonitorClient &client) = 0;
/**
* Empty, needed for subclassing
**/
virtual ~MonitorServer() {}
};
}
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