348 lines
11 KiB
C++
348 lines
11 KiB
C++
////////////////////////////////////////////////////////////////////////////
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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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#include "transact_log_handler.hpp"
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#include "realm_delegate.hpp"
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#include <realm/commit_log.hpp>
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#include <realm/group_shared.hpp>
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#include <realm/lang_bind_helper.hpp>
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using namespace realm;
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namespace {
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class TransactLogHandler {
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using ColumnInfo = RealmDelegate::ColumnInfo;
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using ObserverState = RealmDelegate::ObserverState;
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// Observed table rows which need change information
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std::vector<ObserverState> m_observers;
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// Userdata pointers for rows which have been deleted
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std::vector<void *> invalidated;
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// Delegate to send change information to
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RealmDelegate* m_delegate;
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// Index of currently selected table
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size_t m_current_table = 0;
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// Change information for the currently selected LinkList, if any
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ColumnInfo* m_active_linklist = nullptr;
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// Get the change info for the given column, creating it if needed
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static ColumnInfo& get_change(ObserverState& state, size_t i)
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{
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if (state.changes.size() <= i) {
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state.changes.resize(std::max(state.changes.size() * 2, i + 1));
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}
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return state.changes[i];
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}
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// Loop over the columns which were changed in an observer state
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template<typename Func>
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static void for_each(ObserverState& state, Func&& f)
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{
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for (size_t i = 0; i < state.changes.size(); ++i) {
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auto const& change = state.changes[i];
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if (change.changed) {
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f(i, change);
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}
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}
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}
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// Mark the given row/col as needing notifications sent
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bool mark_dirty(size_t row_ndx, size_t col_ndx)
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{
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auto it = lower_bound(begin(m_observers), end(m_observers), ObserverState{m_current_table, row_ndx, nullptr});
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if (it != end(m_observers) && it->table_ndx == m_current_table && it->row_ndx == row_ndx) {
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get_change(*it, col_ndx).changed = true;
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}
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return true;
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}
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// Remove the given observer from the list of observed objects and add it
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// to the listed of invalidated objects
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void invalidate(ObserverState *o)
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{
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invalidated.push_back(o->info);
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m_observers.erase(m_observers.begin() + (o - &m_observers[0]));
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}
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public:
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template<typename Func>
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TransactLogHandler(RealmDelegate* delegate, SharedGroup& sg, Func&& func)
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: m_delegate(delegate)
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{
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if (!delegate) {
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func();
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return;
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}
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m_observers = delegate->get_observed_rows();
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if (m_observers.empty()) {
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auto old_version = sg.get_version_of_current_transaction();
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func();
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if (old_version != sg.get_version_of_current_transaction()) {
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delegate->did_change({}, {});
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}
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return;
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}
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func(*this);
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delegate->did_change(m_observers, invalidated);
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}
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// Called at the end of the transaction log immediately before the version
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// is advanced
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void parse_complete()
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{
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m_delegate->will_change(m_observers, invalidated);
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}
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// These would require having an observer before schema init
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// Maybe do something here to throw an error when multiple processes have different schemas?
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bool insert_group_level_table(size_t, size_t, StringData) { return false; }
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bool erase_group_level_table(size_t, size_t) { return false; }
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bool rename_group_level_table(size_t, StringData) { return false; }
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bool insert_column(size_t, DataType, StringData, bool) { return false; }
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bool insert_link_column(size_t, DataType, StringData, size_t, size_t) { return false; }
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bool erase_column(size_t) { return false; }
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bool erase_link_column(size_t, size_t, size_t) { return false; }
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bool rename_column(size_t, StringData) { return false; }
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bool add_search_index(size_t) { return false; }
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bool remove_search_index(size_t) { return false; }
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bool add_primary_key(size_t) { return false; }
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bool remove_primary_key() { return false; }
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bool set_link_type(size_t, LinkType) { return false; }
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bool select_table(size_t group_level_ndx, int, const size_t*) noexcept
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{
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m_current_table = group_level_ndx;
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return true;
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}
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bool insert_empty_rows(size_t, size_t, size_t, bool)
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{
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// rows are only inserted at the end, so no need to do anything
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return true;
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}
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bool erase_rows(size_t row_ndx, size_t, size_t last_row_ndx, bool unordered)
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{
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for (size_t i = 0; i < m_observers.size(); ++i) {
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auto& o = m_observers[i];
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if (o.table_ndx == m_current_table) {
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if (o.row_ndx == row_ndx) {
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invalidate(&o);
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--i;
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}
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else if (unordered && o.row_ndx == last_row_ndx) {
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o.row_ndx = row_ndx;
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}
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else if (!unordered && o.row_ndx > row_ndx) {
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o.row_ndx -= 1;
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}
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}
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}
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return true;
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}
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bool clear_table()
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{
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for (size_t i = 0; i < m_observers.size(); ) {
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auto& o = m_observers[i];
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if (o.table_ndx == m_current_table) {
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invalidate(&o);
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}
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else {
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++i;
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}
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}
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return true;
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}
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bool select_link_list(size_t col, size_t row)
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{
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m_active_linklist = nullptr;
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for (auto& o : m_observers) {
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if (o.table_ndx == m_current_table && o.row_ndx == row) {
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m_active_linklist = &get_change(o, col);
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break;
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}
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}
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return true;
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}
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void append_link_list_change(ColumnInfo::Kind kind, size_t index) {
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ColumnInfo *o = m_active_linklist;
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if (!o || o->kind == ColumnInfo::Kind::SetAll) {
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// Active LinkList isn't observed or already has multiple kinds of changes
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return;
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}
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if (o->kind == ColumnInfo::Kind::None) {
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o->kind = kind;
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o->changed = true;
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o->indices.add(index);
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}
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else if (o->kind == kind) {
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if (kind == ColumnInfo::Kind::Remove) {
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o->indices.add_shifted(index);
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}
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else if (kind == ColumnInfo::Kind::Insert) {
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o->indices.insert_at(index);
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}
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else {
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o->indices.add(index);
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}
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}
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else {
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// Array KVO can only send a single kind of change at a time, so
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// if there's multiple just give up and send "Set"
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o->indices.set(0);
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o->kind = ColumnInfo::Kind::SetAll;
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}
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}
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bool link_list_set(size_t index, size_t)
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{
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append_link_list_change(ColumnInfo::Kind::Set, index);
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return true;
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}
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bool link_list_insert(size_t index, size_t)
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{
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append_link_list_change(ColumnInfo::Kind::Insert, index);
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return true;
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}
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bool link_list_erase(size_t index)
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{
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append_link_list_change(ColumnInfo::Kind::Remove, index);
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return true;
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}
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bool link_list_nullify(size_t index)
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{
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append_link_list_change(ColumnInfo::Kind::Remove, index);
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return true;
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}
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bool link_list_swap(size_t index1, size_t index2)
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{
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append_link_list_change(ColumnInfo::Kind::Set, index1);
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append_link_list_change(ColumnInfo::Kind::Set, index2);
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return true;
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}
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bool link_list_clear(size_t old_size)
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{
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ColumnInfo *o = m_active_linklist;
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if (!o || o->kind == ColumnInfo::Kind::SetAll) {
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return true;
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}
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if (o->kind == ColumnInfo::Kind::Remove)
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old_size += o->indices.size();
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else if (o->kind == ColumnInfo::Kind::Insert)
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old_size -= o->indices.size();
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o->indices.set(old_size);
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o->kind = ColumnInfo::Kind::Remove;
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o->changed = true;
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return true;
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}
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bool link_list_move(size_t from, size_t to)
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{
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ColumnInfo *o = m_active_linklist;
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if (!o || o->kind == ColumnInfo::Kind::SetAll) {
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return true;
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}
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if (from > to) {
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std::swap(from, to);
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}
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if (o->kind == ColumnInfo::Kind::None) {
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o->kind = ColumnInfo::Kind::Set;
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o->changed = true;
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}
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if (o->kind == ColumnInfo::Kind::Set) {
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for (size_t i = from; i <= to; ++i)
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o->indices.add(i);
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}
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else {
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o->indices.set(0);
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o->kind = ColumnInfo::Kind::SetAll;
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}
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return true;
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}
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// Things that just mark the field as modified
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bool set_int(size_t col, size_t row, int_fast64_t) { return mark_dirty(row, col); }
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bool set_bool(size_t col, size_t row, bool) { return mark_dirty(row, col); }
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bool set_float(size_t col, size_t row, float) { return mark_dirty(row, col); }
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bool set_double(size_t col, size_t row, double) { return mark_dirty(row, col); }
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bool set_string(size_t col, size_t row, StringData) { return mark_dirty(row, col); }
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bool set_binary(size_t col, size_t row, BinaryData) { return mark_dirty(row, col); }
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bool set_date_time(size_t col, size_t row, DateTime) { return mark_dirty(row, col); }
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bool set_table(size_t col, size_t row) { return mark_dirty(row, col); }
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bool set_mixed(size_t col, size_t row, const Mixed&) { return mark_dirty(row, col); }
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bool set_link(size_t col, size_t row, size_t) { return mark_dirty(row, col); }
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bool set_null(size_t col, size_t row) { return mark_dirty(row, col); }
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bool nullify_link(size_t col, size_t row) { return mark_dirty(row, col); }
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// Doesn't change any data
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bool optimize_table() { return true; }
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// Used for subtables, which we currently don't support
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bool select_descriptor(int, const size_t*) { return false; }
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};
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} // anonymous namespace
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namespace realm {
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namespace transaction {
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void advance(SharedGroup& sg, ClientHistory& history, RealmDelegate* delegate) {
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TransactLogHandler(delegate, sg, [&](auto&&... args) {
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LangBindHelper::advance_read(sg, history, std::move(args)...);
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});
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}
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void begin(SharedGroup& sg, ClientHistory& history, RealmDelegate* delegate) {
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TransactLogHandler(delegate, sg, [&](auto&&... args) {
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LangBindHelper::promote_to_write(sg, history, std::move(args)...);
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});
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}
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void commit(SharedGroup& sg, ClientHistory&, RealmDelegate* delegate) {
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LangBindHelper::commit_and_continue_as_read(sg);
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if (delegate) {
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delegate->did_change({}, {});
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}
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}
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void cancel(SharedGroup& sg, ClientHistory& history, RealmDelegate* delegate) {
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TransactLogHandler(delegate, sg, [&](auto&&... args) {
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LangBindHelper::rollback_and_continue_as_read(sg, history, std::move(args)...);
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});
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}
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} // namespace transaction
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} // namespace realm
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