Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.application / src / org / simantics / application / db / SocketUtils.java

diff --git a/bundles/org.simantics.application/src/org/simantics/application/db/SocketUtils.java b/bundles/org.simantics.application/src/org/simantics/application/db/SocketUtils.java
new file mode 100644 (file)
index 0000000..331b5ef
--- /dev/null
+++ b/bundles/org.simantics.application/src/org/simantics/application/db/SocketUtils.java
@@ -0,0 +1,45 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.application.db;\r
+\r
+import java.net.BindException;\r
+import java.net.Socket;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class SocketUtils {\r
+\r
+    /**\r
+     * @return free ephemeral port for a TCP socket\r
+     */\r
+    public static int getFreeEphemeralPort() {\r
+        while (true) {\r
+            try {\r
+                Socket s = null;\r
+                try {\r
+                    s = new Socket();\r
+                    s.bind(null);\r
+                    return s.getLocalPort();\r
+                } finally {\r
+                    if (s != null)\r
+                        s.close();\r
+                }\r
+            } catch (BindException e) {\r
+                // Nothing to do, try next port\r
+            } catch (Throwable e) {\r
+                throw new Error(e);\r
+            }\r
+        }\r
+    }\r
+\r
+}\r