Merge pull request #12 from Microsoft/async

Use std::future<> to allow concurrency and batching in queries

Author: wravery

CMakeLists.txt

@@ -9,6 +9,8 @@ if(WIN32)
   SET(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE)
 endif()
 
+find_package(Threads MODULE REQUIRED)
+
 find_package(pegtl CONFIG REQUIRED)
 
 add_executable(schemagen GraphQLTree.cpp SchemaGenerator.cpp)
@@ -32,6 +34,7 @@ add_library(graphqlservice
   Introspection.cpp
   IntrospectionSchema.cpp)
 target_link_libraries(graphqlservice PRIVATE taocpp::pegtl)
+target_link_libraries(graphqlservice PUBLIC ${CMAKE_THREAD_LIBS_INIT})
 target_include_directories(graphqlservice SYSTEM PUBLIC ${RAPIDJSON_INCLUDE_DIRS})
 target_include_directories(graphqlservice SYSTEM INTERFACE $<INSTALL_INTERFACE:include>)
 target_include_directories(graphqlservice PRIVATE ${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR})
@@ -72,7 +75,8 @@ if(BUILD_TESTS OR UPDATE_SAMPLES)
     target_include_directories(test_today PRIVATE ${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR})
     set_property(TARGET test_today PROPERTY CXX_STANDARD 11)
 
-    find_package(GTest REQUIRED)
+    enable_testing()
+    find_package(GTest MODULE REQUIRED)
 
     add_executable(tests
       tests.cpp)
@@ -85,7 +89,6 @@ if(BUILD_TESTS OR UPDATE_SAMPLES)
     target_include_directories(tests PRIVATE ${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR})
     set_property(TARGET tests PROPERTY CXX_STANDARD 11)
 
-    enable_testing()
     add_test(NAME TodayServiceCase
       COMMAND tests --gtest_filter=TodayServiceCase.*
       WORKING_DIRECTORY $<TARGET_FILE_DIR:tests>)