From b086f57f56bf0eb9dab9cf321a0f69aaaae84347 Mon Sep 17 00:00:00 2001
From: Andrew Branson <andrew.branson@cern.ch>
Date: Wed, 30 May 2012 08:37:45 +0200
Subject: Initial Maven Conversion

---
 .../c2kernel/utils/server/SimpleTCPIPServer.java   | 109 +++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 src/main/java/com/c2kernel/utils/server/SimpleTCPIPServer.java

(limited to 'src/main/java/com/c2kernel/utils/server/SimpleTCPIPServer.java')

diff --git a/src/main/java/com/c2kernel/utils/server/SimpleTCPIPServer.java b/src/main/java/com/c2kernel/utils/server/SimpleTCPIPServer.java
new file mode 100644
index 0000000..930fcee
--- /dev/null
+++ b/src/main/java/com/c2kernel/utils/server/SimpleTCPIPServer.java
@@ -0,0 +1,109 @@
+package com.c2kernel.utils.server;
+
+import java.io.InterruptedIOException;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.util.ArrayList;
+import java.util.ListIterator;
+import java.util.NoSuchElementException;
+
+import com.c2kernel.utils.Logger;
+
+
+public class SimpleTCPIPServer implements Runnable
+{
+    int                 port            = 0;
+    int                 maxConn         = 10;
+    Thread              listener        = null;
+    Class<?>               handlerClass    = null;
+    ServerSocket        serverSocket    = null;
+    boolean            keepListening   = true;
+    ArrayList<SocketHandler>           currentHandlers = new ArrayList<SocketHandler>();
+    static short       noServers = 0;
+
+    public SimpleTCPIPServer(int port, Class<?> handlerClass, int maxConnections)
+    {
+        this.port         = port;
+        this.handlerClass = handlerClass;
+        this.maxConn      = maxConnections;
+        noServers++;
+    }
+
+    public void startListening()
+    {
+        if(listener != null) return;
+        keepListening = true;
+
+        listener = new Thread(this);
+        listener.start();
+    }
+
+    public void stopListening()
+    {
+        Logger.msg("SimpleTCPIPServer: Closing server for " + handlerClass.getName() +" on port "+ port);
+        keepListening = false;
+        for (SocketHandler thisHandler : currentHandlers) {
+            thisHandler.shutdown();
+        }
+    }
+
+    @Override
+	public void run()
+    {
+        Thread.currentThread().setName("TCP/IP Server for "+handlerClass.getName());
+        Socket       connectionSocket = null;
+
+        try {
+            serverSocket = new ServerSocket(port);
+            if (port == 0)
+                port = serverSocket.getLocalPort();
+            Logger.msg("SimpleTCPIPServer: Created server for " + handlerClass.getName()+" on port "+port);
+            serverSocket.setSoTimeout(500);
+            SocketHandler freeHandler = null;
+            while(keepListening) {
+                if (freeHandler == null || freeHandler.isBusy()) {
+                    ListIterator<SocketHandler> i = currentHandlers.listIterator();
+                    try {
+                        do {
+                            freeHandler = i.next();
+                        } while (freeHandler.isBusy());
+                    } catch (NoSuchElementException e) {
+                        // create new one
+                        if (currentHandlers.size() < maxConn) {
+                            freeHandler = (SocketHandler)handlerClass.newInstance();
+                            currentHandlers.add(freeHandler);
+                        }
+                        else { // max handlers are created. wait for a while, then look again
+                            Logger.warning("No free handlers left for "+handlerClass.getName()+" on port "+ port + "!");
+                            Thread.sleep(2000);
+                            continue;
+                        }
+                    }
+                }
+                try {
+                    connectionSocket = serverSocket.accept();
+                    if (keepListening) {
+                        Logger.msg("SimpleTCPIPServer: Connection to "+freeHandler.getName()+" from "+
+                            connectionSocket.getInetAddress());
+                        freeHandler.setSocket(connectionSocket);
+                        new Thread(freeHandler).start();
+                    }
+                } catch (InterruptedIOException ex1) { }// timeout just to check if we've been told to die
+
+            }
+            serverSocket.close();
+            Logger.msg("SimpleTCPIPServer: Server closed for " + handlerClass.getName() +" on port "+ port);
+        } catch(Exception ex) {
+            Logger.error(ex);
+            Logger.error("SimpleTCPIPServer.run(): Fatal Error. Listener for '"+handlerClass.getName()+"' will stop.");
+            listener = null; --noServers;
+            return;
+        }
+        listener = null;
+        Logger.msg("SimpleTCPIPServer - Servers still running: "+--noServers);
+    }
+
+    public int getPort() {
+        return port;
+    }
+}
-- 
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