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# Copyright 2016 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS-IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from typing import List
import networkx as nx
def generate_files(injection_graph: nx.DiGraph, generate_runtime_bench_code: bool):
file_content_by_name = dict()
for node_id in injection_graph.nodes:
deps = list(injection_graph.successors(node_id))
file_content_by_name['component%s.h' % node_id] = _generate_component_header(node_id, deps)
file_content_by_name['component%s.cpp' % node_id] = _generate_component_source(node_id, deps)
[toplevel_node] = [node_id
for node_id in injection_graph.nodes
if not any(True for p in injection_graph.predecessors(node_id))]
file_content_by_name['main.cpp'] = _generate_main(injection_graph, toplevel_node, generate_runtime_bench_code)
return file_content_by_name
def _generate_component_header(component_index: int, deps: List[int]):
fields = ''.join(['std::shared_ptr<Interface%s> x%s;\n' % (dep, dep)
for dep in deps])
component_deps = ''.join([', std::shared_ptr<Interface%s>' % dep for dep in deps])
include_directives = ''.join(['#include "component%s.h"\n' % index for index in deps])
template = """
#ifndef COMPONENT{component_index}_H
#define COMPONENT{component_index}_H
#include <boost/di.hpp>
#include <boost/di/extension/scopes/scoped.hpp>
#include <memory>
// Example include that the code might use
#include <vector>
namespace di = boost::di;
{include_directives}
struct Interface{component_index} {{
virtual ~Interface{component_index}() = default;
}};
struct X{component_index} : public Interface{component_index} {{
{fields}
BOOST_DI_INJECT(X{component_index}{component_deps});
virtual ~X{component_index}() = default;
}};
auto x{component_index}Component = [] {{
return di::make_injector(di::bind<Interface{component_index}>().to<X{component_index}>().in(di::extension::scoped));
}};
#endif // COMPONENT{component_index}_H
"""
return template.format(**locals())
def _generate_component_source(component_index: int, deps: List[int]):
param_initializers = ', '.join('x%s(x%s)' % (dep, dep)
for dep in deps)
if param_initializers:
param_initializers = ': ' + param_initializers
component_deps = ', '.join('std::shared_ptr<Interface%s> x%s' % (dep, dep)
for dep in deps)
template = """
#include "component{component_index}.h"
X{component_index}::X{component_index}({component_deps})
{param_initializers} {{
}}
"""
return template.format(**locals())
def _generate_main(injection_graph: nx.DiGraph, toplevel_component: int, generate_runtime_bench_code: bool):
include_directives = ''.join('#include "component%s.h"\n' % index
for index in injection_graph.nodes)
injector_params = ', '.join('x%sComponent()' % index
for index in injection_graph.nodes)
if generate_runtime_bench_code:
template = """
{include_directives}
#include "component{toplevel_component}.h"
#include <ctime>
#include <iostream>
#include <cstdlib>
#include <iomanip>
#include <chrono>
using namespace std;
void f() {{
auto injector = di::make_injector({injector_params});
injector.create<std::shared_ptr<Interface{toplevel_component}>>();
}}
int main(int argc, char* argv[]) {{
if (argc != 2) {{
std::cout << "Need to specify num_loops as argument." << std::endl;
exit(1);
}}
size_t num_loops = std::atoi(argv[1]);
double perRequestTime = 0;
std::chrono::high_resolution_clock::time_point start_time = std::chrono::high_resolution_clock::now();
for (size_t i = 0; i < num_loops; i++) {{
f();
}}
perRequestTime += std::chrono::duration_cast<std::chrono::duration<double>>(std::chrono::high_resolution_clock::now() - start_time).count();
std::cout << std::fixed;
std::cout << std::setprecision(15);
std::cout << "Total for setup = " << 0 << std::endl;
std::cout << "Full injection time = " << perRequestTime / num_loops << std::endl;
std::cout << "Total per request = " << perRequestTime / num_loops << std::endl;
return 0;
}}
"""
else:
template = """
{include_directives}
#include "component{toplevel_component}.h"
#include <iostream>
int main() {{
auto injector = di::make_injector({injector_params});
injector.create<std::shared_ptr<Interface{toplevel_component}>>();
std::cout << "Hello, world" << std::endl;
return 0;
}}
"""
return template.format(**locals())
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