/*
* This is the MIT License
* http://www.opensource.org/licenses/mit-license.php
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
package info.ganglia;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
/**
* Connects and sends packets to Ganglia via a multicast socket connection. If the multicast group is passed in as a constructor argument it will use that address.
* Otherwise it will use the multicast group specified by the system env variable "ganglia.host"
*
* @author Chris Bowling
*/
public class GConnector {
private final static int DEFAULT_PORT = 8649;
private final InetAddress inetAddress;
private final MulticastSocket socket;
/**
* Constructor uses multicastAddress specified in the System environment variable "ganglia.host" for its connection to ganglia.
* @throws IOException
*/
public GConnector() throws IOException {
// read system env setting for Ganglia server address
final String gangliaHostAddress = System.getProperty("ganglia.host");
this.inetAddress = InetAddress.getByName(gangliaHostAddress);
// create multicast socket, join group, and send meta data packet
socket = new MulticastSocket(DEFAULT_PORT);
}
/**
* Constructor uses multicastAddress argument for its connection to Ganglia.
* @param multicastAddress address to send metadata and value data packets to
* @throws IOException
*/
public GConnector(String multicastAddress) throws IOException {
this.inetAddress = InetAddress.getByName(multicastAddress);
// create multicast socket, join group, and send meta data packet
socket = new MulticastSocket(DEFAULT_PORT);
}
/**
* Creates a DatagramPacket using the byte[] argument and sends the packet to Ganglia.
* @param buf data formatted for Ganglia to be sent
* @param length byte[] length
*/
public void sendPacket(byte[] buf, int length) {
try {
final DatagramPacket packet = new DatagramPacket(buf, length, inetAddress, DEFAULT_PORT);
socket.send(packet);
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}