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Refactor schema initialization a bit 

Change schema verification to operate on a pair of Schema objects rather than a
Schema and a Group to eliminate some redundant work done, defer some of the
work done for migrations to within the migration block to avoid doing it
unnecessarily, and make passing in a custom schema in the Config when creating
a Realm entirely equivalent to calling update_schema() afterwards.
This commit is contained in:
Thomas Goyne 2015-09-03 10:37:24 -07:00 committed by Ari Lazier
parent 4dd72d47a0
commit ce39ef965f
4 changed files with 134 additions and 115 deletions
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99
object_store.cpp
View File

@ -136,20 +136,24 @@ TableRef ObjectStore::table_for_object_type_create_if_needed(Group *group, const
return group->get_or_add_table(table_name_for_object_type(object_type), &created);
}
static inline bool property_has_changed(Property &p1, Property &p2) {
return p1.type != p2.type || p1.name != p2.name || p1.object_type != p2.object_type || p1.is_nullable != p2.is_nullable;
static inline bool property_has_changed(Property const& p1, Property const& p2) {
return p1.type != p2.type
|| p1.name != p2.name
|| p1.object_type != p2.object_type
|| p1.is_nullable != p2.is_nullable;
}
static bool compare_by_name(ObjectSchema const& lft, ObjectSchema const& rgt) {
return lft.name < rgt.name;
}
void ObjectStore::verify_schema(Group *group, Schema &target_schema, bool allow_missing_tables) {
void ObjectStore::verify_schema(Schema const& actual_schema, Schema &target_schema, bool allow_missing_tables) {
std::sort(begin(target_schema), end(target_schema), compare_by_name);
std::vector<ObjectSchemaValidationException> errors;
for (auto &object_schema : target_schema) {
if (!table_for_object_type(group, object_schema.name)) {
auto matching_schema = std::lower_bound(begin(actual_schema), end(actual_schema), object_schema, compare_by_name);
if (matching_schema == end(actual_schema) || matching_schema->name != object_schema.name) {
if (!allow_missing_tables) {
errors.emplace_back(ObjectSchemaValidationException(object_schema.name,
"Missing table for object type '" + object_schema.name + "'."));
@ -157,7 +161,7 @@ void ObjectStore::verify_schema(Group *group, Schema &target_schema, bool allow_
continue;
}
auto more_errors = verify_object_schema(group, object_schema, target_schema);
auto more_errors = verify_object_schema(*matching_schema, object_schema, target_schema);
errors.insert(errors.end(), more_errors.begin(), more_errors.end());
}
if (errors.size()) {
@ -165,9 +169,8 @@ void ObjectStore::verify_schema(Group *group, Schema &target_schema, bool allow_
}
}
std::vector<ObjectSchemaValidationException> ObjectStore::verify_object_schema(Group *group, ObjectSchema &target_schema, Schema &schema) {
std::vector<ObjectSchemaValidationException> ObjectStore::verify_object_schema(ObjectSchema const& table_schema, ObjectSchema &target_schema, Schema &schema) {
std::vector<ObjectSchemaValidationException> exceptions;
ObjectSchema table_schema(group, target_schema.name);
ObjectSchema cmp;
auto schema_contains_table = [&](std::string const& name) {
@ -176,7 +179,7 @@ std::vector<ObjectSchemaValidationException> ObjectStore::verify_object_schema(G
};
// check to see if properties are the same
Property *primary = nullptr;
const Property *primary = nullptr;
for (auto& current_prop : table_schema.properties) {
auto target_prop = target_schema.property_for_name(current_prop.name);
@ -276,12 +279,27 @@ bool ObjectStore::create_tables(Group *group, Schema &target_schema, bool update
ObjectSchema current_schema(group, target_object_schema->name);
std::vector<Property> &target_props = target_object_schema->properties;
// remove extra columns
size_t deleted = 0;
for (auto& current_prop : current_schema.properties) {
auto target_prop = target_object_schema->property_for_name(current_prop.name);
if (!target_prop || property_has_changed(current_prop, *target_prop)) {
table->remove_column(current_prop.table_column - deleted);
++deleted;
current_prop.table_column = npos;
changed = true;
}
else {
current_prop.table_column -= deleted;
}
}
// add missing columns
for (auto& target_prop : target_props) {
auto current_prop = current_schema.property_for_name(target_prop.name);
// add any new properties (new name or different type)
if (!current_prop || property_has_changed(*current_prop, target_prop)) {
if (!current_prop || current_prop->table_column == npos) {
switch (target_prop.type) {
// for objects and arrays, we have to specify target table
case PropertyTypeObject:
@ -298,17 +316,8 @@ bool ObjectStore::create_tables(Group *group, Schema &target_schema, bool update
changed = true;
}
}
// remove extra columns
sort(begin(current_schema.properties), end(current_schema.properties), [](Property &i, Property &j) {
return j.table_column < i.table_column;
});
for (auto& current_prop : current_schema.properties) {
auto target_prop = target_object_schema->property_for_name(current_prop.name);
if (!target_prop || property_has_changed(current_prop, *target_prop)) {
table->remove_column(current_prop.table_column);
changed = true;
else {
target_prop.table_column = current_prop->table_column;
}
}
@ -337,24 +346,22 @@ bool ObjectStore::is_schema_at_version(Group *group, uint64_t version) {
return old_version == version;
}
bool ObjectStore::realm_requires_update(Group *group, uint64_t version, Schema const& schema) {
if (!is_schema_at_version(group, version)) {
return true;
}
bool ObjectStore::needs_update(Schema const& old_schema, Schema& schema) {
for (auto const& target_schema : schema) {
TableRef table = table_for_object_type(group, target_schema.name);
if (!table) {
auto matching_schema = std::lower_bound(begin(old_schema), end(old_schema), target_schema, compare_by_name);
if (matching_schema == end(old_schema) || matching_schema->name != target_schema.name) {
// Table doesn't exist
return true;
}
if (matching_schema->properties.size() != target_schema.properties.size()) {
// If the number of properties don't match then a migration is required
return false;
}
// Check that all of the property indexes are up to date
size_t count = table->get_column_count();
for (size_t col = 0; col < count; ++col) {
StringData name = table->get_column_name(col);
bool is_indexed = table->has_search_index(col);
auto prop = target_schema.property_for_name(name);
if (prop && prop->requires_index() != is_indexed) {
for (size_t i = 0, count = target_schema.properties.size(); i < count; ++i) {
if (target_schema.properties[i].is_indexed != matching_schema->properties[i].is_indexed) {
return true;
}
}
@ -363,9 +370,8 @@ bool ObjectStore::realm_requires_update(Group *group, uint64_t version, Schema c
return false;
}
bool ObjectStore::update_realm_with_schema(Group *group,
uint64_t version,
Schema &schema,
bool ObjectStore::update_realm_with_schema(Group *group, Schema const& old_schema,
uint64_t version, Schema &schema,
MigrationFunction migration) {
// Recheck the schema version after beginning the write transaction as
// another process may have done the migration after we opened the read
@ -376,7 +382,11 @@ bool ObjectStore::update_realm_with_schema(Group *group,
bool changed = create_metadata_tables(group);
changed = create_tables(group, schema, migrating) || changed;
verify_schema(group, schema);
if (!migrating) {
// If we aren't migrating, then verify that all of the tables which
// were already present are valid (newly created ones always are)
verify_schema(old_schema, schema, true);
}
changed = update_indexes(group, schema) || changed;
@ -403,6 +413,7 @@ Schema ObjectStore::schema_from_group(Group *group) {
schema.emplace_back(group, object_type);
}
}
std::sort(begin(schema), end(schema), compare_by_name);
return schema;
}
@ -466,7 +477,7 @@ InvalidSchemaVersionException::InvalidSchemaVersionException(uint64_t old_versio
m_what = "Provided schema version " + std::to_string(old_version) + " is less than last set version " + std::to_string(new_version) + ".";
}
DuplicatePrimaryKeyValueException::DuplicatePrimaryKeyValueException(std::string object_type, Property &property) :
DuplicatePrimaryKeyValueException::DuplicatePrimaryKeyValueException(std::string object_type, Property const& property) :
m_object_type(object_type), m_property(property)
{
m_what = "Primary key property '" + property.name + "' has duplicate values after migration.";
@ -482,25 +493,25 @@ SchemaValidationException::SchemaValidationException(std::vector<ObjectSchemaVal
}
}
PropertyTypeNotIndexableException::PropertyTypeNotIndexableException(std::string object_type, Property &property) :
PropertyTypeNotIndexableException::PropertyTypeNotIndexableException(std::string object_type, Property const& property) :
ObjectSchemaPropertyException(object_type, property)
{
m_what = "Can't index property " + object_type + "." + property.name + ": indexing a property of type '" + string_for_property_type(property.type) + "' is currently not supported";
}
ExtraPropertyException::ExtraPropertyException(std::string object_type, Property &property) :
ExtraPropertyException::ExtraPropertyException(std::string object_type, Property const& property) :
ObjectSchemaPropertyException(object_type, property)
{
m_what = "Property '" + property.name + "' has been added to latest object model.";
}
MissingPropertyException::MissingPropertyException(std::string object_type, Property &property) :
MissingPropertyException::MissingPropertyException(std::string object_type, Property const& property) :
ObjectSchemaPropertyException(object_type, property)
{
m_what = "Property '" + property.name + "' is missing from latest object model.";
}
InvalidNullabilityException::InvalidNullabilityException(std::string object_type, Property &property) :
InvalidNullabilityException::InvalidNullabilityException(std::string object_type, Property const& property) :
ObjectSchemaPropertyException(object_type, property)
{
if (property.type == PropertyTypeObject) {
@ -515,13 +526,13 @@ InvalidNullabilityException::InvalidNullabilityException(std::string object_type
}
}
MissingObjectTypeException::MissingObjectTypeException(std::string object_type, Property &property) :
MissingObjectTypeException::MissingObjectTypeException(std::string object_type, Property const& property) :
ObjectSchemaPropertyException(object_type, property)
{
m_what = "Target type '" + property.object_type + "' doesn't exist for property '" + property.name + "'.";
}
MismatchedPropertiesException::MismatchedPropertiesException(std::string object_type, Property &old_property, Property &new_property) :
MismatchedPropertiesException::MismatchedPropertiesException(std::string object_type, Property const& old_property, Property const& new_property) :
ObjectSchemaValidationException(object_type), m_old_property(old_property), m_new_property(new_property)
{
if (new_property.type != old_property.type) {

54
object_store.hpp
View File

@ -42,26 +42,26 @@ namespace realm {
// checks if the schema in the group is at the given version
static bool is_schema_at_version(realm::Group *group, uint64_t version);
// verify a target schema against tables in the given group
// updates the column mapping on all ObjectSchema properties
// throws if the schema is invalid or does not match tables in the given group
static void verify_schema(Group *group, Schema &target_schema, bool allow_missing_tables = false);
// verify that schema from a group and a target schema are compatible
// updates the column mapping on all ObjectSchema properties of the target schema
// throws if the schema is invalid or does not match
static void verify_schema(Schema const& actual_schema, Schema &target_schema, bool allow_missing_tables = false);
// updates the target_column member for all properties based on the column indexes in the passed in group
static void update_column_mapping(Group *group, ObjectSchema &target_schema);
// determines if you must call update_realm_with_schema for a given realm.
// returns true if there is a schema version mismatch, if there tables which still need to be created,
// or if file format or other changes/updates need to be made
static bool realm_requires_update(Group *group, uint64_t version, Schema const& schema);
// determines if a realm with the given old schema needs non-migration
// changes to make it compatible with the given target schema
static bool needs_update(Schema const& old_schema, Schema& schema);
// updates a Realm to a given target schema/version creating tables and updating indexes as necessary
// updates a Realm from old_schema to the given target schema, creating and updating tables as needed
// returns if any changes were made
// passed in schema ar updated with the correct column mapping
// optionally runs migration function/lambda if schema is out of date
// passed in target schema is updated with the correct column mapping
// optionally runs migration function if schema is out of date
// NOTE: must be performed within a write transaction
typedef std::function<void(Group *, Schema &)> MigrationFunction;
static bool update_realm_with_schema(Group *group, uint64_t version, Schema &schema, MigrationFunction migration);
static bool update_realm_with_schema(Group *group, Schema const& old_schema, uint64_t version,
Schema &schema, MigrationFunction migration);
// get a table for an object type
static realm::TableRef table_for_object_type(Group *group, StringData object_type);
@ -88,10 +88,10 @@ namespace realm {
// if update existing is true, updates existing tables, otherwise only adds and initializes new tables
static bool create_tables(realm::Group *group, Schema &target_schema, bool update_existing);
// verify a target schema against its table, setting the table_column property on each schema object
// verify a target schema against an expected schema, setting the table_column property on each schema object
// updates the column mapping on the target_schema
// returns array of validation errors
static std::vector<ObjectSchemaValidationException> verify_object_schema(Group *group, ObjectSchema &target_schema, Schema &schema);
static std::vector<ObjectSchemaValidationException> verify_object_schema(ObjectSchema const& expected, ObjectSchema &target_schema, Schema &schema);
// get primary key property name for object type
static StringData get_primary_key_for_object(Group *group, StringData object_type);
@ -118,7 +118,7 @@ namespace realm {
public:
ObjectStoreException() = default;
ObjectStoreException(const std::string &what) : m_what(what) {}
virtual const char* what() const noexcept { return m_what.c_str(); }
const char* what() const noexcept override { return m_what.c_str(); }
protected:
std::string m_what;
};
@ -137,9 +137,9 @@ namespace realm {
class DuplicatePrimaryKeyValueException : public MigrationException {
public:
DuplicatePrimaryKeyValueException(std::string object_type, Property &property);
DuplicatePrimaryKeyValueException(std::string object_type, Property const& property);
std::string object_type() { return m_object_type; }
Property &property() { return m_property; }
Property const& property() { return m_property; }
private:
std::string m_object_type;
Property m_property;
@ -166,36 +166,36 @@ namespace realm {
class ObjectSchemaPropertyException : public ObjectSchemaValidationException {
public:
ObjectSchemaPropertyException(std::string object_type, Property &property) :
ObjectSchemaPropertyException(std::string object_type, Property const& property) :
ObjectSchemaValidationException(object_type), m_property(property) {}
Property &property() { return m_property; }
Property const& property() { return m_property; }
private:
Property m_property;
};
class PropertyTypeNotIndexableException : public ObjectSchemaPropertyException {
public:
PropertyTypeNotIndexableException(std::string object_type, Property &property);
PropertyTypeNotIndexableException(std::string object_type, Property const& property);
};
class ExtraPropertyException : public ObjectSchemaPropertyException {
public:
ExtraPropertyException(std::string object_type, Property &property);
ExtraPropertyException(std::string object_type, Property const& property);
};
class MissingPropertyException : public ObjectSchemaPropertyException {
public:
MissingPropertyException(std::string object_type, Property &property);
MissingPropertyException(std::string object_type, Property const& property);
};
class InvalidNullabilityException : public ObjectSchemaPropertyException {
public:
InvalidNullabilityException(std::string object_type, Property &property);
InvalidNullabilityException(std::string object_type, Property const& property);
};
class MissingObjectTypeException : public ObjectSchemaPropertyException {
public:
MissingObjectTypeException(std::string object_type, Property &property);
MissingObjectTypeException(std::string object_type, Property const& property);
};
class DuplicatePrimaryKeysException : public ObjectSchemaValidationException {
@ -205,9 +205,9 @@ namespace realm {
class MismatchedPropertiesException : public ObjectSchemaValidationException {
public:
MismatchedPropertiesException(std::string object_type, Property &old_property, Property &new_property);
Property &old_property() { return m_old_property; }
Property &new_property() { return m_new_property; }
MismatchedPropertiesException(std::string object_type, Property const& old_property, Property const& new_property);
Property const& old_property() { return m_old_property; }
Property const& new_property() { return m_new_property; }
private:
Property m_old_property, m_new_property;
};

94
shared_realm.cpp
View File

@ -121,30 +121,36 @@ SharedRealm Realm::get_shared_realm(Config config)
SharedRealm realm(new Realm(std::move(config)));
auto target_schema = std::move(realm->m_config.schema);
auto target_schema_version = realm->m_config.schema_version;
realm->m_config.schema_version = ObjectStore::get_schema_version(realm->read_group());
// we want to ensure we are only initializing a single realm at a time
static std::mutex s_init_mutex;
std::lock_guard<std::mutex> lock(s_init_mutex);
uint64_t old_version = ObjectStore::get_schema_version(realm->read_group());
if (auto existing = s_global_cache.get_any_realm(realm->config().path)) {
// if there is an existing realm at the current path steal its schema/column mapping
// FIXME - need to validate that schemas match
realm->m_config.schema = std::make_unique<Schema>(*existing->m_config.schema);
}
else if (!realm->m_config.schema) {
// get schema from group and skip validation
realm->m_config.schema_version = old_version;
realm->m_config.schema = std::make_unique<Schema>(ObjectStore::schema_from_group(realm->read_group()));
}
else if (realm->m_config.read_only) {
if (old_version == ObjectStore::NotVersioned) {
throw UnitializedRealmException("Can't open an un-initialized Realm without a Schema");
}
ObjectStore::verify_schema(realm->read_group(), *realm->m_config.schema, true);
}
else {
// its a non-cached realm so update/migrate if needed
realm->update_schema(*realm->m_config.schema, realm->m_config.schema_version);
// otherwise get the schema from the group
realm->m_config.schema = std::make_unique<Schema>(ObjectStore::schema_from_group(realm->read_group()));
// if a target schema is supplied, verify that it matches or migrate to
// it, as neeeded
if (target_schema) {
if (realm->m_config.read_only) {
if (realm->m_config.schema_version == ObjectStore::NotVersioned) {
throw UnitializedRealmException("Can't open an un-initialized Realm without a Schema");
}
ObjectStore::verify_schema(*realm->m_config.schema, *target_schema, true);
realm->m_config.schema = std::move(target_schema);
}
else {
realm->update_schema(std::move(target_schema), target_schema_version);
}
}
}
if (config.cache) {
@ -153,47 +159,49 @@ SharedRealm Realm::get_shared_realm(Config config)
return realm;
}
bool Realm::update_schema(Schema const& schema, uint64_t version)
bool Realm::update_schema(std::unique_ptr<Schema> schema, uint64_t version)
{
bool changed = false;
Config old_config(m_config);
// set new version/schema
if (m_config.schema.get() != &schema) {
m_config.schema = std::make_unique<Schema>(schema);
bool needs_update = !m_config.read_only && (m_config.schema_version != version || ObjectStore::needs_update(*m_config.schema, *schema));
if (!needs_update) {
ObjectStore::verify_schema(*m_config.schema, *schema, m_config.read_only);
m_config.schema = std::move(schema);
m_config.schema_version = version;
return false;
}
// Store the old config/schema for the migration function, and update
// our schema to the new one
auto old_schema = std::move(m_config.schema);
Config old_config(m_config);
old_config.read_only = true;
old_config.schema = std::move(old_schema);
m_config.schema = std::move(schema);
m_config.schema_version = version;
try {
if (!m_config.read_only && ObjectStore::realm_requires_update(read_group(), version, schema)) {
// keep old copy to pass to migration function
old_config.read_only = true;
old_config.schema_version = ObjectStore::get_schema_version(read_group());
old_config.schema = std::make_unique<Schema>(ObjectStore::schema_from_group(read_group()));
SharedRealm old_realm(new Realm(old_config));
auto updated_realm = shared_from_this();
auto migration_function = [&](Group*, Schema&) {
SharedRealm old_realm(new Realm(old_config));
auto updated_realm = shared_from_this();
m_config.migration_function(old_realm, updated_realm);
};
// update and migrate
begin_transaction();
changed = ObjectStore::update_realm_with_schema(read_group(), version, *m_config.schema,
[=](__unused Group *group, __unused Schema &target_schema) {
m_config.migration_function(old_realm, updated_realm);
});
commit_transaction();
}
else {
ObjectStore::verify_schema(read_group(), *m_config.schema, m_config.read_only);
}
try {
// update and migrate
begin_transaction();
bool changed = ObjectStore::update_realm_with_schema(read_group(), *old_config.schema,
version, *m_config.schema,
migration_function);
commit_transaction();
return changed;
}
catch (...) {
if (is_in_transaction()) {
cancel_transaction();
}
m_config.schema_version = old_config.schema_version;
m_config.schema = std::move(old_config.schema);
m_config.schema = std::move(m_config.schema);
throw;
}
return changed;
}
static void check_read_write(Realm *realm)

2
shared_realm.hpp
View File

@ -75,7 +75,7 @@ namespace realm {
// on the Config, and the resulting Schema and version with updated
// column mappings are set on the realms config upon success.
// returns if any changes were made
bool update_schema(Schema const& schema, uint64_t version);
bool update_schema(std::unique_ptr<Schema> schema, uint64_t version);
static uint64_t get_schema_version(Config const& config);