CheckHost4J

Java implementation of the check-host.net API

Contact

If you encounter any issues, please report them on the issue tracker.
If you just want to talk or need help with CheckHost4J feel free to join my Discord.

How to add this to your project

Gradle/Maven

To use CheckHost4J with Gradle/Maven you can use Maven Central, Lenni0451's Maven or Jitpack.
You can also find instructions how to implement it into your build script there.

Jar File

If you just want the latest jar file you can download it from the GitHub Actions or use the Release.

This library requires you to have Gson in your class path

API Terminology

The API main class is CheckHost4J, it contains all the methods to interact with the API.

final CheckHost4J checkHost = CheckHost4J.INSTANCE;

You can either use the CheckHost4J.INSTANCE or create a new instance of CheckHost4J yourself, by creating an own instance you can define the IRequester yourself, which is used to send the requests to the API.

final CheckHost4J checkHost = new CheckHost4J(...);

The default IRequester is JavaRequester, which can be accessed via JavaRequester.INSTANCE, you can also create a new instance using new JavaRequester("<user-agent>").

final CheckHost4J checkHost = new CheckHost4J(new JavaRequester("MyUserAgent"));

You can use the methods CheckHost4J#ping, CheckHost4J#http, CheckHost4J#tcpPort, CheckHost4J#udpPort and CheckHost4J#dns to get a ResultNode<T> where T is the result type of the request (e.g. PingResult, TCPResult).

final ResultNode<PingResult> pingResult = checkHost.ping("example.com", 80 /* max nodes */);

After you got the ResultNode<T> you can use the tickResults() to update the getResults() list.

// This will update the results list by sending the check-result request to the API,
// This might not update all results, because some might not be finished yet
// Which means you have to call this method multiple times to get all results (e.g. with a delay of 5 seconds)
pingResult.tickResults();

final Map<ServerNode, PingResult> results = pingResult.getResults();
results.forEach((serverNode, result) -> {
    if (result == null) { // All results which are not finished yet will be null
        System.out.println(serverNode.name + " is still checking...");
    } else if (result.getErrorMessage() != null) {
        System.out.println(serverNode.name + " failed: " + result.getErrorMessage());
    } else {
        System.out.println(serverNode.name + " responded: " + result.getSuccessfulPings() + "/" + result.getTotalPings());
    }
});

You can also get all the server nodes which are being checked by using the getNodes() method.

final List<ServerNode> nodes = pingResult.getNodes();

The de.florianmichael.checkhost4j.model.result package contains all the result classes, which are used to store the result of the requests.

To get a list of all Request types you can use the ResultType enum.