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#ifndef NODE_SQLITE3_SRC_ASYNC_H
#define NODE_SQLITE3_SRC_ASYNC_H
#include "threading.h"
#include <node_version.h>
#if defined(NODE_SQLITE3_BOOST_THREADING)
#include <boost/thread/mutex.hpp>
#endif
// Generic uv_async handler.
template <class Item, class Parent> class Async {
typedef void (*Callback)(Parent* parent, Item* item);
protected:
uv_async_t watcher;
NODE_SQLITE3_MUTEX_t
std::vector<Item*> data;
Callback callback;
public:
Parent* parent;
public:
Async(Parent* parent_, Callback cb_)
: callback(cb_), parent(parent_) {
watcher.data = this;
NODE_SQLITE3_MUTEX_INIT
uv_async_init(uv_default_loop(), &watcher, reinterpret_cast<uv_async_cb>(listener));
}
static void listener(uv_async_t* handle, int status) {
Async* async = static_cast<Async*>(handle->data);
std::vector<Item*> rows;
NODE_SQLITE3_MUTEX_LOCK(&async->mutex)
rows.swap(async->data);
NODE_SQLITE3_MUTEX_UNLOCK(&async->mutex)
for (unsigned int i = 0, size = rows.size(); i < size; i++) {
#if NODE_VERSION_AT_LEAST(0, 7, 9)
uv_unref((uv_handle_t *)&async->watcher);
#else
uv_unref(uv_default_loop());
#endif
async->callback(async->parent, rows[i]);
}
}
static void close(uv_handle_t* handle) {
assert(handle != NULL);
assert(handle->data != NULL);
Async* async = static_cast<Async*>(handle->data);
delete async;
}
void finish() {
// Need to call the listener again to ensure all items have been
// processed. Is this a bug in uv_async? Feels like uv_close
// should handle that.
listener(&watcher, 0);
uv_close((uv_handle_t*)&watcher, close);
}
void add(Item* item) {
// Make sure node runs long enough to deliver the messages.
#if NODE_VERSION_AT_LEAST(0, 7, 9)
uv_ref((uv_handle_t *)&watcher);
#else
uv_ref(uv_default_loop());
#endif
NODE_SQLITE3_MUTEX_LOCK(&mutex);
data.push_back(item);
NODE_SQLITE3_MUTEX_UNLOCK(&mutex)
}
void send() {
uv_async_send(&watcher);
}
void send(Item* item) {
add(item);
send();
}
~Async() {
NODE_SQLITE3_MUTEX_DESTROY
}
};
#endif
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