Created
December 9, 2019 15:51
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A utility class that provides a method for finding a random freely available TCP/IP port. Mostly used in integration tests.
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| public class TestUtils { | |
| // an AutoCloseable bean is needed to guarantee the found port is freed before we can use it | |
| private static class SocketHolder implements Closeable { | |
| private final ServerSocket socket; | |
| public SocketHolder(ServerSocket socket) { | |
| this.socket = socket; | |
| } | |
| public ServerSocket getSocket() { | |
| return socket; | |
| } | |
| @Override | |
| public void close() throws IOException { | |
| socket.close(); | |
| } | |
| } | |
| public static int findFreePort() { | |
| // cf. https://gist.github.com/3429822 | |
| try (SocketHolder holder = new SocketHolder(new ServerSocket(0))) { | |
| holder.getSocket().setReuseAddress(true); | |
| return holder.getSocket().getLocalPort(); | |
| } | |
| catch (IOException e) { | |
| throw new IllegalStateException("Could not open an available free port", e); | |
| } | |
| } | |
| } |
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