d9337152f3
This adds a requires_thread predicate to functions and propagates that up until we get to code that already returns futures. We can then use the predicate to decide if we need to use seastar::async. Signed-off-by: Rafael Ávila de Espíndola <espindola@scylladb.com>
108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Copyright (C) 2014 ScyllaDB
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*
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* Modified by ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "function_name.hh"
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#include "types.hh"
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#include <vector>
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#include <optional>
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namespace cql3 {
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namespace functions {
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class function {
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public:
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using opt_bytes = std::optional<bytes>;
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virtual ~function() {}
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virtual const function_name& name() const = 0;
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virtual const std::vector<data_type>& arg_types() const = 0;
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virtual const data_type& return_type() const = 0;
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/**
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* Checks whether the function is a pure function (as in doesn't depend on, nor produce side effects) or not.
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*
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* @return <code>true</code> if the function is a pure function, <code>false</code> otherwise.
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*/
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virtual bool is_pure() = 0;
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/**
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* Checks whether the function is a native/hard coded one or not.
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*
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* @return <code>true</code> if the function is a native/hard coded one, <code>false</code> otherwise.
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*/
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virtual bool is_native() = 0;
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virtual bool requires_thread() const = 0;
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/**
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* Checks whether the function is an aggregate function or not.
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*
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* @return <code>true</code> if the function is an aggregate function, <code>false</code> otherwise.
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*/
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virtual bool is_aggregate() = 0;
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virtual void print(std::ostream& os) const = 0;
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virtual bool uses_function(const sstring& ks_name, const sstring& function_name) = 0;
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virtual bool has_reference_to(function& f) = 0;
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/**
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* Returns the name of the function to use within a ResultSet.
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*
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* @param column_names the names of the columns used to call the function
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* @return the name of the function to use within a ResultSet
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*/
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virtual sstring column_name(const std::vector<sstring>& column_names) = 0;
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friend class function_call;
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friend std::ostream& operator<<(std::ostream& os, const function& f);
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};
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inline
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std::ostream&
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operator<<(std::ostream& os, const function& f) {
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f.print(os);
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return os;
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}
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}
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}
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