79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
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////////////////////////////////////////////////////////////////////////////
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//
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// Copyright 2015 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_DELEGATE_HPP
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#define REALM_DELEGATE_HPP
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#include "index_set.hpp"
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#include <tuple>
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#include <vector>
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namespace realm {
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class RealmDelegate {
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public:
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virtual ~RealmDelegate() = default;
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struct ColumnInfo {
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bool changed = false;
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enum class Kind {
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None,
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Set,
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Insert,
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Remove,
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SetAll
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} kind = Kind::None;
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IndexSet indices;
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};
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struct ObserverState {
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size_t table_ndx;
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size_t row_ndx;
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void* info; // opaque user info
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std::vector<ColumnInfo> changes;
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// Simple lexographic ordering
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friend bool operator<(ObserverState const& lft, ObserverState const& rgt) {
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return std::tie(lft.table_ndx, lft.row_ndx) < std::tie(rgt.table_ndx, rgt.row_ndx);
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}
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};
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// The Realm has committed a write transaction, and other Realms at the
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// same path should be notified
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virtual void transaction_committed() = 0;
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// There are now new versions available for the Realm, but it has not
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// had its read version advanced
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virtual void changes_available() = 0;
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// Called before changing the read transaction. Should return a list of
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// ObserverStates for each row for which detailed change information is
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// desired.
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virtual std::vector<ObserverState> get_observed_rows() = 0;
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// The Realm's read version will change
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// Only called if get_observed_row() returned a non-empty array.
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virtual void will_change(std::vector<ObserverState> const&, std::vector<void*> const&) = 0;
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// The Realm's read version has changed
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virtual void did_change(std::vector<ObserverState> const&, std::vector<void*> const&) = 0;
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};
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} // namespace realm
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#endif /* REALM_DELEGATE_HPP */
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