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/**
* Copyright (C) 2023-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <cstddef>
#include <functional>
#include <string>
#include <type_traits>
#include <utility>
#include "mongo/base/string_data.h"
#include "mongo/executor/connection_pool.h"
#include "mongo/executor/connection_pool_stats.h"
#include "mongo/platform/mutex.h"
#include "mongo/stdx/unordered_map.h"
#include "mongo/util/duration.h"
#include "mongo/util/net/hostandport.h"
namespace mongo::executor {
/**
* This file is intended for simple implementations of ConnectionPool::ControllerInterface that
* might be shared between different libraries. Currently, it contains only one such implementation,
* the DyamicLimitController below.
*/
/**
* A simple controller that allows for the maximum and minimum pool size to have dynamic values.
* At construction, provide callables that return the current maximum and minimum sizes to be used
* by the pool.
*
* Currently, the callables that provide the max and min are stateless and don't inspect any data
* about the pool. The other pool parameters (maxConnecting, host/pending/refresh timeouts) are
* simply taken from the Optoins the relevant ConnectionPool was started with. However, this
* type is intended to be easily extensible to add these features in the future if needed.
*/
class DynamicLimitController final : public ConnectionPool::ControllerInterface {
public:
DynamicLimitController(std::function<size_t()> minLoader,
std::function<size_t()> maxLoader,
StringData name)
: _minLoader(std::move(minLoader)),
_maxLoader(std::move(maxLoader)),
_name(std::move(name)) {}
void init(ConnectionPool* parent) override;
void addHost(PoolId id, const HostAndPort& host) override;
HostGroupState updateHost(PoolId id, const HostState& stats) override;
void removeHost(PoolId id) override;
ConnectionControls getControls(PoolId id) override;
Milliseconds hostTimeout() const override {
return getPoolOptions().hostTimeout;
}
Milliseconds pendingTimeout() const override {
return getPoolOptions().refreshTimeout;
}
Milliseconds toRefreshTimeout() const override {
return getPoolOptions().refreshRequirement;
}
StringData name() const override {
return _name;
}
void updateConnectionPoolStats(ConnectionPoolStats* cps) const override {}
private:
struct PoolData {
HostAndPort host;
size_t target = 0;
};
std::function<size_t()> _minLoader;
std::function<size_t()> _maxLoader;
std::string _name;
Mutex _mutex = MONGO_MAKE_LATCH("DynamicLimitController::_mutex");
stdx::unordered_map<PoolId, PoolData> _poolData;
};
} // namespace mongo::executor
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