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AdmissionController.h
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/
AdmissionController.h
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/*
* Copyright 2018-present Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <string>
#include <folly/Function.h>
namespace apache {
namespace thrift {
class AdmissionController {
public:
using MetricReportFn =
folly::Function<void(const std::string&, double) const>;
virtual ~AdmissionController() {}
/**
* Return true if the message should be admitted.
*/
virtual bool admit() = 0;
/**
* Indicate to the controller that the server has dequeued 1 request and is
* currently processing it.
*/
virtual void dequeue() = 0;
/**
* Indicate to the controller that the server has finished processing the
* request, and it returned a response to the client.
*/
virtual void returnedResponse() = 0;
virtual void reportMetrics(const MetricReportFn&, const std::string&) {}
};
class DenyAllAdmissionController : public AdmissionController {
public:
~DenyAllAdmissionController() {}
bool admit() override {
return false;
}
void dequeue() override {}
void returnedResponse() override {}
};
class AcceptAllAdmissionController : public AdmissionController {
public:
~AcceptAllAdmissionController() {}
bool admit() override {
return true;
}
void dequeue() override {}
void returnedResponse() override {}
};
} // namespace thrift
} // namespace apache