114 lines
3.7 KiB
C++
114 lines
3.7 KiB
C++
////////////////////////////////////////////////////////////////////////////
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//
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// Copyright 2016 Realm Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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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#ifndef REALM_THREAD_SAFE_REFERENCE_HPP
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#define REALM_THREAD_SAFE_REFERENCE_HPP
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#include <realm/group_shared.hpp>
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namespace realm {
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class LinkView;
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class List;
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class Object;
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class Query;
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class Realm;
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class Results;
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class TableView;
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template<typename T> class BasicRow;
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typedef BasicRow<Table> Row;
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// Opaque type representing an object for handover
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class ThreadSafeReferenceBase {
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public:
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ThreadSafeReferenceBase(const ThreadSafeReferenceBase&) = delete;
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ThreadSafeReferenceBase& operator=(const ThreadSafeReferenceBase&) = delete;
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ThreadSafeReferenceBase(ThreadSafeReferenceBase&&) = default;
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ThreadSafeReferenceBase& operator=(ThreadSafeReferenceBase&&) = default;
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ThreadSafeReferenceBase();
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virtual ~ThreadSafeReferenceBase();
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bool is_invalidated() const { return m_source_realm == nullptr; };
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protected:
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// Precondition: The associated Realm is for the current thread and is not in a write transaction;.
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ThreadSafeReferenceBase(std::shared_ptr<Realm> source_realm);
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SharedGroup& get_source_shared_group() const;
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template <typename V, typename T>
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V invalidate_after_import(Realm& destination_realm, T construct_with_shared_group);
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private:
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friend Realm;
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VersionID m_version_id;
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std::shared_ptr<Realm> m_source_realm; // Strong reference keeps alive so version stays pinned! Don't touch!!
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bool has_same_config(Realm& realm) const;
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void invalidate();
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};
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template <typename T>
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class ThreadSafeReference;
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template<>
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class ThreadSafeReference<List>: public ThreadSafeReferenceBase {
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friend class Realm;
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std::unique_ptr<SharedGroup::Handover<LinkView>> m_link_view;
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std::unique_ptr<SharedGroup::Handover<Table>> m_table;
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// Precondition: The associated Realm is for the current thread and is not in a write transaction;.
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ThreadSafeReference(List const& value);
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// Precondition: Realm and handover are on same version.
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List import_into_realm(std::shared_ptr<Realm> realm) &&;
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};
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template<>
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class ThreadSafeReference<Object>: public ThreadSafeReferenceBase {
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friend class Realm;
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std::unique_ptr<SharedGroup::Handover<Row>> m_row;
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std::string m_object_schema_name;
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// Precondition: The associated Realm is for the current thread and is not in a write transaction;.
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ThreadSafeReference(Object const& value);
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// Precondition: Realm and handover are on same version.
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Object import_into_realm(std::shared_ptr<Realm> realm) &&;
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};
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template<>
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class ThreadSafeReference<Results>: public ThreadSafeReferenceBase {
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friend class Realm;
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std::unique_ptr<SharedGroup::Handover<Query>> m_query;
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DescriptorOrdering::HandoverPatch m_ordering_patch;
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// Precondition: The associated Realm is for the current thread and is not in a write transaction;.
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ThreadSafeReference(Results const& value);
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// Precondition: Realm and handover are on same version.
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Results import_into_realm(std::shared_ptr<Realm> realm) &&;
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};
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}
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#endif /* REALM_THREAD_SAFE_REFERENCE_HPP */
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