1 /*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "js_observer.h"
17
18 namespace OHOS::DistributedData {
Clear()19 void JSObserver::Clear()
20 {
21 // Clear() run in js main thread, so it serial run with AsyncCall() lambda, so we can use no lock.
22 if (callback_ == nullptr) {
23 return ;
24 }
25 napi_delete_reference(uvQueue_->GetEnv(), callback_);
26 callback_ = nullptr;
27 }
28
JSObserver(std::shared_ptr<UvQueue> uvQueue,napi_value callback)29 JSObserver::JSObserver(std::shared_ptr<UvQueue> uvQueue, napi_value callback)
30 : uvQueue_(uvQueue)
31 {
32 napi_create_reference(uvQueue_->GetEnv(), callback, 1, &callback_);
33 }
34
~JSObserver()35 JSObserver::~JSObserver()
36 {
37 }
38
GetCallback()39 napi_ref JSObserver::GetCallback()
40 {
41 return callback_;
42 }
43
AsyncCall(UvQueue::NapiArgsGenerator genArgs)44 void JSObserver::AsyncCall(UvQueue::NapiArgsGenerator genArgs)
45 {
46 if (callback_ == nullptr) {
47 return;
48 }
49
50 uvQueue_->AsyncCall([observer = shared_from_this()](napi_env env) -> napi_value {
51 // the lambda run in js main thread, so it serial run with Clear(), so we can use no lock.
52 if (observer->callback_ == nullptr) {
53 return nullptr;
54 }
55 napi_value callback = nullptr;
56 napi_get_reference_value(env, observer->callback_, &callback);
57 return callback;
58 }, genArgs);
59 }
60 } // namespace OHOS::DistributedData
61