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AmazonCloudWatchLogsClient async methods failing with no error


AmazonCloudWatchLogsClient async methods failing with no error

By : David Lozano
Date : November 21 2020, 03:00 PM
it fixes the issue Apparently, you have to be careful while calling async methods. One problem in the calling chain will cause issues. In my case, 3 functions up the stack, a method was async with a return value of void.
code :
public async void LogBatchThroughput
public async Task LogBatchThroughput


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Pitfalls of wrapping callback async methods with Task async methods?

Pitfalls of wrapping callback async methods with Task async methods?


By : saisireesha
Date : March 29 2020, 07:55 AM
should help you out I do not see any pitfalls with doing this, in fact it opens your application to allot more flexible scenarios. I would suggest you also look at converting some of your "call back" scenarios to a the observer pattern (see Reactive Extensions project by Microsoft) which, when combined with the Task-based pattern, is so much more powerful and flexible. And of course you will be able to use your new new Task-based pattern with the new async/await-pattern in C# 5.0!
Hope it helps.
Differences between Async CTP and Bcl.Async when calling async methods as sync

Differences between Async CTP and Bcl.Async when calling async methods as sync


By : Trav Sullivan
Date : March 29 2020, 07:55 AM
I hope this helps you . As a general rule, synchronous wrappers around asynchronous methods are strongly discouraged. When you use the Result approach, you run the risk of deadlock (as I describe on my blog); also, Result will wrap any exceptions, which makes your error handling much trickier.
So I'd say "don't do that."
Where are FIle.ReadAll***Async/WriteAll***Async/AppendAll***Async methods?

Where are FIle.ReadAll***Async/WriteAll***Async/AppendAll***Async methods?


By : Xu Wang
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further
"... I need their asynchronous counterparts, but they just don't exist. Why?"
code :
public Task<int> SendAsync(byte[] datagram, int bytes)
{
    return Task<int>.Factory.FromAsync(BeginSend, EndSend, datagram, bytes, null);
}
Entity Framework core failing on async methods

Entity Framework core failing on async methods


By : Chris Tranter
Date : March 29 2020, 07:55 AM
like below fixes the issue Entity framework should be added to the services container using the Scoped lifetime, repo and services should be configured as transient so that a new instance is created and injected as needed and guarantees that instances are not reused.
EF should be scoped so that it is created on every request and disposed once the request ends.
Failing chai test for async function throwing an error

Failing chai test for async function throwing an error


By : user3013691
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further And another mistake is to provide an object method (or any stand-alone function that relies on this) as the target of the assertion. Doing so is problematic because the this context will be lost when the function is invoked by .throw; there’s no way for it to know what this is supposed to be. There are two ways around this problem. One solution is to wrap the method or function call inside of another function. Another solution is to use bind. If you test sync function.
code :
expect(function () { cat.meow(); }).to.throw();  // Function expression
expect(() => cat.meow()).to.throw();             // ES6 arrow function
expect(cat.meow.bind(cat)).to.throw();           // Bind
it('should fail', async () => {
  await expect(this.ctrl.add(req.body)).to.be.rejectedWith(Error);
})
async add(req) {
  const db = _.get(req, 'app.locals.db');
  const bookDescription = req.body;
  logger.info('books.add', bookDescription);
  if (_.isEmpty(bookDescription)) {
    throw new Error('missing_body');
  }
  [...]
}

describe('+add(req)', function() {
  it('should fail because of missing body', async function() {
    const req = {
      body: {},
    };

  await expect(this.ctrl.add(req.body)).to.be.rejectedWith(Error);
  });
});
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