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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "itablefactory.h"
#include "itablemanager.h"
#include <map>
#include <vector>
#include <mutex>
namespace search::fef {
/**
* This class manages a set of tables and contains an ordered list of table factories used to create tables,
* and a cache of allready created tables. A table is accessed by a unique name.
**/
class TableManager : public ITableManager
{
private:
TableManager(const TableManager &);
TableManager &operator=(const TableManager &);
using TableCache = std::map<vespalib::string, Table::SP>;
std::vector<ITableFactory::SP> _factories;
mutable TableCache _cache;
mutable std::mutex _lock;
public:
TableManager();
~TableManager() override;
/**
* Adds a table factory to this manager.
* The table factories are used in the order they where added to create tables.
**/
void addFactory(ITableFactory::SP factory) { _factories.push_back(factory); }
/**
* Retrieves the table with the given name using the following strategy:
* 1. Try to find the table in the cache.
* 2. Iterate over the table factories and try to create the table.
* The first table that is successfully created is added it to the cache and returned.
* 3. Return NULL.
**/
const Table * getTable(const vespalib::string & name) const override;
};
}
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