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weak.cpp
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62 lines (52 loc) · 1.97 KB
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/*********************************************************************
* NAN - Native Abstractions for Node.js
*
* Copyright (c) 2018 NAN contributors
*
* MIT License <https://github.com/nodejs/nan/blob/master/LICENSE.md>
********************************************************************/
#include <nan.h>
using namespace Nan; // NOLINT(build/namespaces)
static AsyncResource* async_resource;
static Persistent<v8::Function> cb;
void weakCallback(
const WeakCallbackInfo<int> &data) { // NOLINT(runtime/references)
HandleScope scope;
int *parameter = data.GetParameter();
v8::Local<v8::Value> val = New(*parameter);
async_resource->runInAsyncScope(
GetCurrentContext()->Global(), New(cb), 1, &val);
delete async_resource;
delete parameter;
}
v8::Local<v8::String> wrap(v8::Local<v8::Function> func) {
EscapableHandleScope scope;
v8::Local<v8::String> lstring = New<v8::String>("result").ToLocalChecked();
int *parameter = new int(42);
Persistent<v8::Function> persistent(func);
persistent.SetWeak(parameter, weakCallback, WeakCallbackType::kParameter);
assert(persistent.IsWeak());
return scope.Escape(lstring);
}
NAN_METHOD(Hustle) {
async_resource = new AsyncResource("nan:test:weak");
cb.Reset(To<v8::Function>(info[1]).ToLocalChecked());
info.GetReturnValue().Set(wrap(To<v8::Function>(info[0]).ToLocalChecked()));
}
inline void WeakExternalCallback(const WeakCallbackInfo<void>&) {}
NAN_METHOD(WeakExternal) {
void* baton = &baton; // Actual value doesn't really matter.
Persistent<v8::External> external(New<v8::External>(baton));
external.SetWeak(baton, WeakExternalCallback, WeakCallbackType::kParameter);
}
NAN_MODULE_INIT(Init) {
Set(target
, New<v8::String>("hustle").ToLocalChecked()
, GetFunction(New<v8::FunctionTemplate>(Hustle)).ToLocalChecked()
);
Set(target
, New<v8::String>("weakExternal").ToLocalChecked()
, GetFunction(New<v8::FunctionTemplate>(WeakExternal)).ToLocalChecked()
);
}
NODE_MODULE(weak, Init)