Stop using random ports. It causes FP

The same port can be given twice before the processes
are started.
On Travis, we know all those ports are free. We still
check with nc, just to be sure.

diff --git a/it/it-tests/src/test/java/com/sonar/orchestrator/util/NetworkUtils.java b/it/it-tests/src/test/java/com/sonar/orchestrator/util/NetworkUtils.java
new file mode 100644 (file)
index 0000000..9274dab
--- /dev/null
+++ b/it/it-tests/src/test/java/com/sonar/orchestrator/util/NetworkUtils.java
@@ -0,0 +1,63 @@
+/*
+ * Orchestrator
+ * Copyright (C) 2011 SonarSource
+ * sonarqube@googlegroups.com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package com.sonar.orchestrator.util;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.ServerSocket;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public final class NetworkUtils {
+  private static final AtomicInteger nextPort = new AtomicInteger(20000);
+
+  private NetworkUtils() {
+  }
+
+  public static int getNextAvailablePort() {
+    System.out.println("=== Override method provided by orchestrator");
+
+    if ("true".equals(System.getenv("TRAVIS"))) {
+      for (int i = 0; i < 10; i++) {
+        int port = nextPort.getAndIncrement();
+
+        try {
+          System.out.println("=== Trying port " + port);
+          Process process = new ProcessBuilder("nc", "-z", "localhost", Integer.toString(port)).start();
+          if (process.waitFor() == 1) {
+            System.out.println("=== Using port " + port);
+            return port;
+          }
+        } catch (Exception e) {
+          // Ignore. will try again
+          System.out.println(e);
+        }
+      }
+
+      throw new IllegalStateException("Can't find a free network port");
+    }
+
+    try (ServerSocket socket = new ServerSocket()) {
+      socket.bind(new InetSocketAddress("localhost", 0));
+      return socket.getLocalPort();
+    } catch (IOException e) {
+      throw new IllegalStateException("Can't find a free network port", e);
+    }
+  }
+}