Context in Mercury
Here’s the translated code and explanation in Java, formatted for Hugo:
Our first example demonstrates how to use Context
in a Java HTTP server. In Java, we don’t have an exact equivalent of Go’s context.Context
, but we can achieve similar functionality using other mechanisms.
In this Java example, we’re using the com.sun.net.httpserver
package to create a simple HTTP server. While Java doesn’t have a direct equivalent to Go’s context.Context
, we can achieve similar functionality using other mechanisms.
The HelloHandler
class implements the HttpHandler
interface, which is similar to the handler function in the Go example. The handle
method is called for each incoming request to the “/hello” endpoint.
To simulate work being done by the server, you could add a delay using Thread.sleep()
. However, unlike Go’s example where we can easily cancel the operation using the context, in Java we would need to implement our own cancellation mechanism, possibly using Future
or CompletableFuture
.
To run the server:
You can then make a request to the server:
In the server logs, you would see:
Note that this Java example doesn’t implement the cancellation functionality shown in the Go example. To achieve that in Java, you would need to use more complex concurrency utilities like ExecutorService
with Future
s, or reactive programming libraries like RxJava or Project Reactor.