0135b4d5cd
Metadata usually doesn't change after it is created; make that visible in the code, allowing further optimizations to be applied later. Message-Id: <1464334638-7971-3-git-send-email-avi@scylladb.com>
120 lines
3.7 KiB
C++
120 lines
3.7 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 "service/client_state.hh"
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#include "service/query_state.hh"
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#include "service/storage_proxy.hh"
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#include "cql3/query_options.hh"
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namespace transport {
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namespace messages {
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class result_message;
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}
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}
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namespace cql3 {
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class metadata;
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shared_ptr<const metadata> make_empty_metadata();
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class cql_statement {
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public:
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virtual ~cql_statement()
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{ }
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virtual uint32_t get_bound_terms() = 0;
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/**
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* Perform any access verification necessary for the statement.
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*
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* @param state the current client state
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*/
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virtual future<> check_access(const service::client_state& state) = 0;
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/**
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* Perform additional validation required by the statment.
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* To be overriden by subclasses if needed.
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*
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* @param state the current client state
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*/
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virtual void validate(distributed<service::storage_proxy>& proxy, const service::client_state& state) = 0;
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/**
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* Execute the statement and return the resulting result or null if there is no result.
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*
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* @param state the current query state
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* @param options options for this query (consistency, variables, pageSize, ...)
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*/
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virtual future<::shared_ptr<transport::messages::result_message>>
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execute(distributed<service::storage_proxy>& proxy, service::query_state& state, const query_options& options) = 0;
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/**
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* Variant of execute used for internal query against the system tables, and thus only query the local node = 0.
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*
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* @param state the current query state
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*/
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virtual future<::shared_ptr<transport::messages::result_message>>
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execute_internal(distributed<service::storage_proxy>& proxy, service::query_state& state, const query_options& options) = 0;
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virtual bool uses_function(const sstring& ks_name, const sstring& function_name) const = 0;
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virtual bool depends_on_keyspace(const sstring& ks_name) const = 0;
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virtual bool depends_on_column_family(const sstring& cf_name) const = 0;
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virtual shared_ptr<const metadata> get_result_metadata() const = 0;
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};
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class cql_statement_no_metadata : public cql_statement {
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public:
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virtual shared_ptr<const metadata> get_result_metadata() const override {
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return make_empty_metadata();
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}
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};
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}
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