What's New in ASP.NET Core 3.0?
Health Checks
ASP.NET Core 3.0 introduces a range of new features. One of the more interesting (IMO) is Health Checks. You may use tools like Pingdom or elmah.io Uptime Monitoring to ping your website in a specified interval. Pinging a single HTML page may or may not reveal if your application is healthy or not. Health Checks to the rescue! Before trying out the code yourself, make sure to install the recent version of ASP.NET Core 3.0 and Visual Studio 2017.
"Lambda" health checks
Simpler type are "lambda" checks. To register such check one needs to call AddCheck (or AddAsyncCheck for asynchronous version) which takes function as a parameter. This function needs to return HealthCheckResult. An instance of HealthCheckResult carries a true or false value (which maps to failed or passed) and optionally a description, exception and additional data. The value will be used to determine the status of health check, while optional properties will end up in logs.
"Concrete Class" health checks
An alternative way to represent a health check is through a class implementing IHealthCheckinterface. This gives a lot more flexibility, starting with access to DI. This ability is crucial for the second health check I wanted to implement - Redis instance connection check. Checking the connection requires acquiring RedisCacheOptions and initializing ConnectionMultiplexer based on that options. If the connection is created with AbortOnConnectFail property set to false, ConnectionMultiplexer.IsConnected can be used at any time to get current status.
HTTPREPL
So, what we are doing in ASP.NET Core 3.0 is there is a new tool which name is “httprepl”. It’s a dotnet core global tool that you can install in your machine and that gives you a command line repl for interacting with API endpoints.
SignalR Java Client
In ASP.NET Core 3.0 they are introducing a Java Client for SignalR. The first preview of this new client is available now. This client supports connecting to an ASP.NET Core SignalR Server from Java code, including Android apps.
The API for the Java client is very similar to that of the already existing .NET and JavaScript clients but there are some important differences to note.
The HubConnection is initialized the same way, with the HubConnectionBuilder type.
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