datasources 0.1.42

Async datasource interfaces, middleware, registry, and test doubles
Documentation 
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use crate::built_repository::BuiltRepository;
use crate::connection::Connection;
use crate::converters::{MetaDataRowTypeConverter, RowTypeConverter};
use crate::mappers::{IdentityMapper, Mapper};
use crate::readonly_repository_mapping_options::ReadonlyRepositoryMappingOptions;
use crate::readonly_repository_statements::ReadonlyRepositoryStatements;
use crate::registry_state::registered_driver;
use crate::result::Result;
use crate::statement_mappers::StatementMappers;
use std::sync::Arc;

pub struct ReadonlyRepositoryBuilder;

impl ReadonlyRepositoryBuilder {
    pub fn parts(
        connection: Arc<dyn Connection>,
        options: ReadonlyRepositoryMappingOptions,
    ) -> Result<BuiltRepository> {
        assemble(connection, options, Vec::new())
    }
}

pub(crate) fn assemble(
    connection: Arc<dyn Connection>,
    options: ReadonlyRepositoryMappingOptions,
    ids: Vec<String>,
) -> Result<BuiltRepository> {
    let ReadonlyRepositoryMappingOptions {
        entity,
        entity_mapper,
        property_mappings,
        read_properties,
        schema,
        row_converter,
        object_converter,
        row_type_converters: _,
    } = options;
    let provider = connection.provider().to_string();
    let row_converter = Some(row_converter.unwrap_or_else(|| {
        RowTypeConverter::from(
            || {
                registered_driver(&provider)
                    .map(|driver| driver.row_type_converters())
                    .unwrap_or_default()
            },
            &schema.types(),
        )
    }));
    let object_converter = object_converter.unwrap_or_else(|| {
        let mut converter = MetaDataRowTypeConverter::new();
        converter.should_coerce_id = true;
        Box::new(converter)
    });
    let entity_mapper: Arc<dyn Mapper<String, String> + Send + Sync> =
        entity_mapper.unwrap_or_else(|| Arc::new(IdentityMapper::new()));
    let property_mappings: Arc<dyn Mapper<String, String> + Send + Sync> =
        property_mappings.unwrap_or_else(|| Arc::new(IdentityMapper::new()));
    let table = entity;
    let mut names: Vec<String> = read_properties;
    if names.is_empty() {
        names = schema.columns.keys().cloned().collect();
    }
    names.sort_by(|left, right| {
        Mapper::map(&property_mappings, left.clone()).cmp(&Mapper::map(&property_mappings, right.clone()))
    });
    let mappings = StatementMappers::new(Arc::clone(&entity_mapper), Arc::clone(&property_mappings));
    Ok(BuiltRepository {
        connection,
        row_converter,
        object_converter,
        property_mappings,
        entity_mapper,
        statements: ReadonlyRepositoryStatements::new(table, names, mappings),
        schema,
        ids,
    })
}