lolson’s gists

lolson / tailLog

Created April 19, 2016 21:53

A java implementation of tail

	// See JLogTailer
	public void tailLog(File file) {
	boolean running = true;
	int updateInterval = 1000;
	long filePointer = file.length();

	try {
	while (running) {
	Thread.sleep(updateInterval);
	long length = file.length();

lolson / TomcatLogViewService.java

Last active April 7, 2016 18:02

Parse tomcat logs and insert them into a hashmap. Matches log entries that match a date timestamp regex and concatenates any subsequent detail log entries into a single line until it reaches the next entry starting with a date.

	public class LogService {
	private static HashMap<Integer, String> esbLogCache = new HashMap<Integer, String>();
	private static String logDateRegex = "^[a-zA-Z]{3} (\\d)+, (\\d){4} (\\d)+:(\\d){2}:(\\d){2} (AM\|PM).*";

	static {
	try {
	BufferedReader br = new BufferedReader(new InputStreamReader(getEsbLog()));
	int row = 0;
	boolean firstRead = true;
	for (String line = br.readLine(); line != null; line = firstRead ? br.readLine() : line) {

lolson / gist:3d2dcb59eb3c535fad7e

Created September 15, 2014 16:29

Load file as resource packaged in a war file

Thread.currentThread().getContextClassLoader().getResourceAsStream("gov/nasa/gsfc/cof/web/data/cities.txt")

lolson / Iterate Map entrySet

Created July 29, 2014 15:28

	for (Map.Entry<String, Object> entry : map.entrySet()) {
	String key = entry.getKey();
	Object value = entry.getValue();
	// ...
	}

lolson / gist:826072e91c408b38f3c2

Last active August 29, 2015 14:04

Check files loaded by Classloader

	for(java.net.URL url:((java.net.URLClassLoader)ClassLoader.getSystemClassLoader()).getURLs()){
	System.out.println(url.getFile());
	}

lolson / HeartbeatEventEJB

Last active August 29, 2015 14:03

Heartbeat Thread EJB

	@Singleton
	@Startup
	@Remote(HeartbeatEvent.class)
	public class HeartbeatEventEJB implements HeartbeatEvent {

	private final static Logger logger = LoggerFactory.getLogger( HeartbeatEventEJB.class);
	private Thread t;
	private Worker w;

	@Override