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allow the timestamper to be controlled by env properties (and, in turn, safe to always run)

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if/when the property "timestamper.enabled" is set, the timestamper will query the sntp server(s) and update the clock accordingly
if/when it is not set (or set to something other than "true"), it will pause with its standard delay before checking again
in addition, it has a guard to help running the timestamper multiple times in the same JVM
This commit is contained in:
jrandom
2004-07-23 17:43:45 +00:00
committed by zzz
parent da4827f287
commit 834fb7e317
1 changed files with 29 additions and 17 deletions
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46
apps/time/java/src/net/i2p/time/Timestamper.java
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@@ -23,21 +23,25 @@ import net.i2p.util.Log;
*/
public class Timestamper implements Runnable {
private static Log _log = new Log(Timestamper.class);
private String _targetURL;
private String _serverList[];
private static String _targetURL;
private static String _serverList[];
private int DELAY_MS = 5*60*1000;
public Timestamper(String url, String serverNames[]) {
if (_log.shouldLog(Log.INFO))
_log.info("Creating new timestamper pointing at " + url);
_targetURL = url;
_serverList = serverNames;
}
public Timestamper() {}
public void startTimestamper() {
if (_log.shouldLog(Log.INFO))
_log.info("Starting timestamper pointing at " + _targetURL);
synchronized (Timestamper.class) {
String enabled = System.getProperty("timestamper.enabled");
if (enabled != null) {
_log.warn("Timestamper already running");
return;
} else {
System.setProperty("timestamper.enabled", "true");
}
}
I2PThread t = new I2PThread(this, "Timestamper");
t.setPriority(I2PThread.MIN_PRIORITY);
t.start();
@@ -48,15 +52,21 @@ public class Timestamper implements Runnable {
_log.info("Starting up timestamper");
try {
while (true) {
if (_log.shouldLog(Log.DEBUG))
_log.debug("Querying servers " + _serverList);
try {
long now = NtpClient.currentTime(_serverList);
String enabled = System.getProperty("timestamper.enabled");
if ( (enabled == null) || (!"true".equals(enabled)) ) {
if (_log.shouldLog(Log.DEBUG))
_log.debug("Stamp time");
stampTime(now);
} catch (IllegalArgumentException iae) {
_log.log(Log.CRIT, "Unable to reach any of the NTP servers - network disconnected?");
_log.debug("Not stamping the time");
} else {
if (_log.shouldLog(Log.DEBUG))
_log.debug("Querying servers " + _serverList);
try {
long now = NtpClient.currentTime(_serverList);
if (_log.shouldLog(Log.DEBUG))
_log.debug("Stamp time");
stampTime(now);
} catch (IllegalArgumentException iae) {
_log.log(Log.CRIT, "Unable to reach any of the NTP servers - network disconnected?");
}
}
try { Thread.sleep(DELAY_MS); } catch (InterruptedException ie) {}
}
@@ -98,7 +108,9 @@ public class Timestamper implements Runnable {
}
String servers[] = new String[args.length-1];
System.arraycopy(args, 1, servers, 0, servers.length);
Timestamper ts = new Timestamper(args[0], servers);
_targetURL = args[0];
_serverList = servers;
Timestamper ts = new Timestamper();
ts.startTimestamper();
}