typedef void (*Callback)(Parent* parent, Item* item);

uv_async_t watcher;

NODE_SQLITE3_MUTEX_t

std::vector<Item*> data;

Callback callback;

Parent* parent;

Async(Parent* parent_, Callback cb_)

: callback(cb_), parent(parent_) {

watcher.data = this;

NODE_SQLITE3_MUTEX_INIT

uv_loop_t *loop;

napi_get_uv_event_loop(parent_->Env(), &loop);

uv_async_init(loop, &watcher, reinterpret_cast<uv_async_cb>(listener));

}

static void listener(uv_async_t* handle) {

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++) {

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);

uv_close((uv_handle_t*)&watcher, close);

}

void add(Item* item) {

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

}