Add an option to override ServerThread name

.gitignore

@@ -0,0 +1,2 @@
+.idea
+SubethaSMTP.iml

src/main/java/org/subethamail/smtp/server/DefaultServerThreadNameProvider.java

@@ -0,0 +1,8 @@
+package org.subethamail.smtp.server;
+
+public class DefaultServerThreadNameProvider implements ServerThreadNameProvider {
+
+    public String getName(SMTPServer server) {
+        return ServerThread.class.getName() + " " + server.getDisplayableLocalSocketAddress();
+    }
+}

src/main/java/org/subethamail/smtp/server/SMTPServer.java

@@ -66,6 +66,8 @@ public class SMTPServer
 	@GuardedBy("this")
 	private ServerThread serverThread;
 
+	private ServerThreadNameProvider serverThreadNameProvider = new DefaultServerThreadNameProvider();
+
 	/**
 	 * True if this SMTPServer was started. It remains true even if the
 	 * SMTPServer has been stopped since. It is used to prevent restarting this
@@ -603,4 +605,16 @@ public SessionIdFactory getSessionIdFactory() {
 	public void setSessionIdFactory(SessionIdFactory sessionIdFactory) {
 		this.sessionIdFactory = sessionIdFactory;
 	}
+
+	/**
+	 * Sets a thread name provider
+	 * @param provider
+	 */
+	public void setServerThreadNameProvider(ServerThreadNameProvider provider){
+		this.serverThreadNameProvider = provider;
+	}
+
+	String getServerThreadName() {
+		return this.serverThreadNameProvider.getName(this);
+	}
 }

src/main/java/org/subethamail/smtp/server/ServerThread.java

@@ -46,7 +46,7 @@ class ServerThread extends Thread
 
 	public ServerThread(SMTPServer server, ServerSocket serverSocket)
 	{
-		super(ServerThread.class.getName() + " " + server.getDisplayableLocalSocketAddress());
+		super(server.getServerThreadName());
 		this.server = server;
 		this.serverSocket = serverSocket;
 		// reserve a few places for graceful disconnects with informative

src/main/java/org/subethamail/smtp/server/ServerThreadNameProvider.java

@@ -0,0 +1,11 @@
+package org.subethamail.smtp.server;
+
+public interface ServerThreadNameProvider {
+
+    /**
+     * Generates a thead name for given server
+     *
+     * @param server
+     */
+    String getName(SMTPServer server);
+}