cdev-1.7.2n

2022-12-13 12:44:04 +01:00
commit b3b88fc333
1357 changed files with 338883 additions and 0 deletions
--- a/extensions/cdevGenericServer/NameServer/java/rsvcUdpClient.java
+++ b/extensions/cdevGenericServer/NameServer/java/rsvcUdpClient.java
@@ -0,0 +1,135 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) 1994,1995 Southeastern Universities Research Association,
+//                         Continuous Electron Beam Accelerator Facility
+//
+// This software was developed under a United States Government license
+// described in the NOTICE file included as part of this distribution.
+//
+// Jefferson Lab HPC Group, 12000 Jefferson Ave., Newport News, VA 23606
+//-----------------------------------------------------------------------------
+//
+// Description:
+//      RSVC UDP Client for Servers to update their time stamps
+//
+// Author:  
+//      Jie Chen
+//      Jefferson Lab HPC Group
+//
+// Revision History:
+//   $Log: rsvcUdpClient.java,v $
+//   Revision 1.1.1.1  2000/05/23 15:12:50  pal
+//   cdev_psi_1.7.2
+//
+//   Revision 1.1  1999/10/18 17:12:44  chen
+//   *** empty log message ***
+//
+//
+//
+import java.io.*;
+import java.util.*;
+import java.net.*;
+import rsvcEvent;
+import rsvcData;
+import rsvcConfig;
+
+public final class rsvcUdpClient
+{
+    // UDP Socket
+    private DatagramSocket udpsocket_ = null;
+    // Destination address for packets
+    private InetAddress    dest_ = null;
+    // Destination port for packets
+    private int            port_ = 0;
+
+    /**
+     * Construct an empty rsvcUdpClient Object
+     */
+    public rsvcUdpClient ()
+    {
+	// empty
+    }
+
+    /**
+     * Override default finalize method.This allows Java virtual
+     * machine to clean up resource when this object is no longer
+     * needed.
+     */
+    protected void finalize() throws Throwable
+    {
+	if (udpsocket_ != null)
+	    udpsocket_.close ();
+    }
+
+    /**
+     * Connect to a server that is on a given host at a given port
+     */
+    public synchronized void connect (String host, int port) throws UnknownHostException, IOException
+    {
+	try {
+	    udpsocket_ = new DatagramSocket ();
+	}catch (IOException e) {
+	    System.err.println(e);
+	    throw e;
+	}
+
+	try {
+	    dest_ = InetAddress.getByName (host);
+	}catch (UnknownHostException ue) {
+	    throw ue;
+	}
+	port_ = port;
+    }
+
+    /**
+     * A server that is being managed by RSVC sends a very simple data
+     * to the rsvcServer to manifest itself being alive.
+     * data is in the form of two tagged ("name", "domain") values or
+     * anything that will make up an index
+     */
+    public synchronized int update (rsvcData data) throws IOException
+    {
+	if (udpsocket_ == null)
+	    return rsvcConfig.RSVC_ERROR;
+
+	rsvcEvent cbk = new rsvcEvent (data);
+	cbk.setOpcode (rsvcConfig.RSVC_SET);
+	cbk.setEventid (0);
+
+	int datasize = cbk.streamSize ();
+	ByteArrayOutputStream baoutput = new ByteArrayOutputStream (datasize);
+	try {
+	    cbk.streamOut (baoutput);
+	}catch (IOException e) {
+	    throw e;
+	}
+
+	// return underlying byte from this byteArrayStream
+	byte[] obuffer = baoutput.toByteArray ();
+	if (datasize != obuffer.length) {
+	    throw new IOException ("Streamed out buffer size != original calculated stream size");
+	}
+
+	// construct a datapacket to send data out
+	DatagramPacket packet = new DatagramPacket (obuffer, datasize,
+						    dest_, port_);
+
+	try {
+	    udpsocket_.send (packet);
+	} catch (IOException e) {
+	    throw e;
+	}
+	return rsvcConfig.RSVC_SUCCESS;
+    }
+
+    /**
+     * Shutdown connection (close socket)
+     */
+    public void disconnect () 
+    {
+	if (udpsocket_ != null)
+	    udpsocket_.close ();
+    }
+	
+	
+}
+