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Code Issues Releases Wiki Activity

Add a backend interface version number for eventual future changes.

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Note that the interface is still a work in progress and might change
while still keeping the same interface version. This is going to be true
until the first stable release of this project (non beta).
This commit is contained in:
King_DuckZ 2016-06-02 10:01:19 +02:00
parent 0cb91fb9ca
commit e2275ce5db
5 changed files with 56 additions and 1 deletions
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23
src/backends/backend_loader.cpp
View file

@ -20,6 +20,7 @@
#include "backends/backend_loader.hpp"
#include "backends/exposed_functions.hpp"
#include "backends/backend_version.hpp"
#include <dlfcn.h>
#include <cassert>
#include <functional>
@ -50,6 +51,13 @@ namespace dindb {
void nop_destroy (Backend*) {
}
int backend_iface_version (void* parSOHandle) {
typedef decltype(&dindexer_backend_iface_version) GetVersionFun;
auto get_version = reinterpret_cast<GetVersionFun>(dlsym(parSOHandle, "dindexer_backend_iface_version"));
return get_version();
}
} //unnamed namespace
std::string backend_name (const std::string& parSOPath) {
@ -70,8 +78,13 @@ namespace dindb {
BackendPlugin::BackendPlugin (const std::string& parSOPath, const YAML::Node* parConfig) :
m_lib(dlopen(parSOPath.c_str(), RTLD_LAZY), &dlclose),
m_backend(load_backend(m_lib.get(), parConfig)),
m_name(backend_name(m_lib.get()))
m_name(backend_name(m_lib.get())),
m_iface_ver(backend_iface_version(m_lib.get()))
{
if (g_current_iface_version != m_iface_ver) {
m_backend.reset();
m_lib.reset();
}
}
BackendPlugin::~BackendPlugin() noexcept {
@ -104,4 +117,12 @@ namespace dindb {
bool BackendPlugin::is_loaded() const {
return static_cast<bool>(m_backend);
}
int BackendPlugin::backend_interface_version() const {
return m_iface_ver;
}
int BackendPlugin::max_supported_interface_version() const {
return g_current_iface_version;
}
} //namespace dindb

5
src/backends/postgresql/backend_postgresql.cpp
View file

@ -17,6 +17,7 @@
#include "backend_postgresql.hpp"
#include "backends/exposed_functions.hpp"
#include "backends/backend_version.hpp"
#include "tag.hpp"
#include "delete.hpp"
#include "scan.hpp"
@ -179,3 +180,7 @@ extern "C" void dindexer_destroy_backend (dindb::Backend* parDele) {
extern "C" const char* dindexer_backend_name() {
return "postgresql";
}
extern "C" int dindexer_backend_iface_version() {
return dindb::g_current_iface_version;
}