/* | |
* Licensed to the Apache Software Foundation (ASF) under one or more | |
* contributor license agreements. See the NOTICE file distributed with | |
* this work for additional information regarding copyright ownership. | |
* The ASF licenses this file to You under the Apache License, Version 2.0 | |
* (the "License"); you may not use this file except in compliance with | |
* the License. You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
package org.apache.oodt.commons.activity; | |
import java.io.ByteArrayOutputStream; | |
import java.io.IOException; | |
import java.io.ObjectOutputStream; | |
import java.net.DatagramPacket; | |
import java.net.DatagramSocket; | |
import java.net.InetAddress; | |
import java.net.SocketException; | |
import java.net.UnknownHostException; | |
/** | |
* This activity factory produces activities that log their incidents using datagrams. It | |
* examines the system properties to determine where to send the incidents. The property | |
* <code>org.apache.oodt.commons.activity.DatagramLoggingActivityFactory.host</code> (or | |
* <code>activity.host</code> if not defined) teslls to what host to send the datagrams. | |
* There's no default value, and it's an runtime exception if neither property's defined. | |
* | |
* <p>The property <code>org.apache.oodt.commons.activity.DatagramLoggingActivityFactory.port</code> (or | |
* <code>activity.port</code> if not defined) tells to what port to send the datagrams. | |
* It defaults to 4556. | |
* | |
* <p>Once created, it records incidents by serializing them into a byte buffer and | |
* sending that buffer as a datagram to the activity host/port. This does limit the size | |
* of incidents that can go over, but most incidents are pretty small. | |
* | |
* @author Kelly | |
* @version $Revision: 1.1 $ | |
*/ | |
public class DatagramLoggingActivityFactory implements ActivityFactory { | |
/** | |
* Creates a new {@link DatagramLoggingActivityFactory} instance. | |
*/ | |
public DatagramLoggingActivityFactory() { | |
String hostname = System.getProperty("org.apache.oodt.commons.activity.DatagramLoggingActivityFactory.host", | |
System.getProperty("activity.host", "")); | |
port = Integer.getInteger("org.apache.oodt.commons.activity.DatagramLoggingActivityFactory.port", | |
Integer.getInteger("activity.port", 4556)).intValue(); | |
if (hostname.length() == 0) | |
throw new IllegalStateException("System property `org.apache.oodt.commons.activity.DatagramLoggingActivityFactory.host'" | |
+ " (or simply `activity.host') not defined or is empty"); | |
try { | |
host = InetAddress.getByName(hostname); | |
socket = new DatagramSocket(); | |
} catch (UnknownHostException ex) { | |
throw new IllegalStateException("Activity host `" + host + "' unknown"); | |
} catch (SocketException ex) { | |
throw new IllegalStateException("Cannot create anonymous datagram socket"); | |
} | |
} | |
/** | |
* Create an activity that records incidents in a UDP datagram. | |
* | |
* @return an {@link Activity} value. | |
*/ | |
public Activity createActivity() { | |
return new Activity() { | |
public void recordIncident(Incident incident) { | |
try { | |
ByteArrayOutputStream baos = new ByteArrayOutputStream(); | |
ObjectOutputStream oos = new ObjectOutputStream(baos); | |
oos.writeObject(incident); | |
oos.close(); | |
baos.close(); | |
byte[] buf = baos.toByteArray(); | |
DatagramPacket packet = new DatagramPacket(buf, buf.length, host, port); | |
socket.send(packet); | |
} catch (IOException ignore) {} | |
} | |
}; | |
} | |
/** To what host to send datagrams. */ | |
InetAddress host; | |
/** To what port on {@link #host}. */ | |
int port; | |
/** Transmission socket for datagrams. */ | |
DatagramSocket socket; | |
} |