[英]How to use the wait and notify methods correctly?
异步调用有问题。 我需要“ do”循环来等待异步调用继续。 但是,当您运行方法“ lock.wait()”时,冻结和异步调用的应用程序不会被执行。
lock.wait();
冻结的应用程序,但未调用以下命令行,并且该应用程序无法继续执行以下方法:
callUser.enqueue(new Callback<BaseResponse<User>>() {
@Override
public void onResponse(Response<BaseResponse<User>> response, Retrofit retrofit) {
updateUsersFromServer(response.body());
}
@Override
public void onFailure(Throwable t) {
UserEvent UserEvent = new UserEvent(
null, 500, R.string.order_unavailable);
EventBus.getDefault().post(UserEvent);
}
});
我需要更好地了解“ wait()”方法是什么样的。
如何使应用程序不停止在“ wait()”方法中?
public void fetchUser(Integer cdCode, String pinckingListNumber) {
List<User> Users = new ArrayList<>();
do {
fetchUserApi(cdCode, pinckingListNumber);
synchronized (lock) {
try {
lock.wait();
} catch (InterruptedException e) {
callUser = false;
UserEvent UserEvent = new UserEvent(
null, 500, R.string.order_unavailable);
EventBus.getDefault().post(UserEvent);
}
}
offset = offset + 10;
if (!ObjectValidation.isEmptyOrNull(response)) {
for (int i = 0; i < response.getRecords().size(); i++) {
Users.add(response.getRecords().get(i));
}
if (response.getMeta().getRecordCount() < response.getMeta().getOffset())
callUser = false;
} else {
callUser = false;
UserEvent UserEvent = new UserEvent(
null, 500, R.string.order_unavailable);
EventBus.getDefault().post(UserEvent);
}
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
callUser = false;
UserEvent UserEvent = new UserEvent(
null, 500, R.string.order_unavailable);
EventBus.getDefault().post(UserEvent);
}
} while (callUser);
UserEvent UserEvent = new UserEvent(
Users, 200, R.string.delivery_success);
EventBus.getDefault().post(UserEvent);
}
private void fetchUserApi(Integer cdCode, String pinckingListNumber) {
UserResource UserResource = getRetrofit().create(UserResource.class);
Call<BaseResponse<User>> callUser = UserResource.getListUsers(
authController.getTokenHeader(),
pinckingListNumber,
cdCode,
limit,
offset
);
callUser.enqueue(new Callback<BaseResponse<User>>() {
@Override
public void onResponse(Response<BaseResponse<User>> response, Retrofit retrofit) {
updateUsersFromServer(response.body());
}
@Override
public void onFailure(Throwable t) {
UserEvent UserEvent = new UserEvent(
null, 500, R.string.order_unavailable);
EventBus.getDefault().post(UserEvent);
}
});
}
private void updateUsersFromServer(BaseResponse<User> baseResponseUsers) {
synchronized (lock) {
response = baseResponseUsers;
lock.notify();
}
}
在应用程序的情况下,我不能使用Retrofit异步方法。 我不知道是一些改造错误,但是当我使用改造异步方法并执行Wait()命令时,应用程序冻结了。
因此,我必须创建改造的同步方法,然后使用一个Thread,以便我可以使用wait和notify方法而不会冻结应用程序。
public void fetchUser(Integer cdCode, String pinckingListNumber) {
List<User> Users = new ArrayList<>();
do {
fetchUserApi(cdCode, pinckingListNumber);
// My code modification
synchronized (thread) {
try {
thread.wait();
} catch (InterruptedException e) {
callUser = false;
UserEvent UserEvent = new UserEvent(
null, 500, R.string.order_unavailable);
EventBus.getDefault().post(UserEvent);
}
}
offset = offset + 10;
if (!ObjectValidation.isEmptyOrNull(response)) {
for (int i = 0; i < response.getRecords().size(); i++) {
Users.add(response.getRecords().get(i));
}
if (response.getMeta().getRecordCount() < response.getMeta().getOffset())
callUser = false;
} else {
callUser = false;
UserEvent UserEvent = new UserEvent(
null, 500, R.string.order_unavailable);
EventBus.getDefault().post(UserEvent);
}
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
callUser = false;
UserEvent UserEvent = new UserEvent(
null, 500, R.string.order_unavailable);
EventBus.getDefault().post(UserEvent);
}
} while (callUser);
UserEvent UserEvent = new UserEvent(
Users, 200, R.string.delivery_success);
EventBus.getDefault().post(UserEvent);
}
private void fetchUserApi(Integer cdCode, String pinckingListNumber) {
UserResource userResource = getRetrofit().create(UserResource.class);
final Call<BaseResponse<User>> callUserAPI = userResource.getListUsers(
authController.getTokenHeader(),
pinckingListNumber,
cdCode,
limit,
offset
);
// My code modification
thread = new Thread(new Runnable() {
@Override
public void run() {
try {
updateUsersFromServer(callUserAPI.execute().body());
synchronized (thread) {
thread.notify();
}
} catch (IOException e) {
e.printStackTrace();
}
}
});
thread.start();
}
private void updateUsersFromServer(BaseResponse<User> baseResponseUsers) {
response = baseResponseUsers;
}
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