Hi,
I am trying to peruse lucene's Lock for my own purposes, I need to
lock several java processes and I thought I could reuse the Lock
stuff. I understand lucene locks work across jvm.
But I cannot make it work. I tried to reproduce my problem in a small class:
public class SysLock {
private static final Logger logger = Logger.getLogger(SysLock.class);
private int id;
public SysLock(int i) {
id = i;
}
// public static void main(String[] args) throws Exception {
// System.setProperty("org.apache.lucene.lockDir", "C:\\temp\\todel");
// SysLock l1 = new SysLock(1);
// SysLock l2 = new SysLock(2);
//
// TransferThread t = l1.new TransferThread(l1);
// t.start();
// TransferThread t2 = l2.new TransferThread(l2);
// t2.start();
//
// logger.info("Finished.");
// }
public static void main(String[] args) throws Exception {
System.setProperty("org.apache.lucene.lockDir", "C:\\temp\\todel");
SysLock l1 = new SysLock(new Date().getSeconds());
TransferThread t = l1.new TransferThread(l1);
t.start();
logger.info("Finished.");
}
private void forever() throws IOException {
FSDirectory directory = FSDirectory.getDirectory("C:\\temp\\a", true);
try {
new Lock.With(directory.makeLock("COMMIT_LOCK_NAME"),
COMMIT_LOCK_TIMEOUT) {
public Object doBody() throws IOException {
while (true) {
System.out.println("i'm " + id);
try {
Thread.sleep(2000);
}
catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}.run();
}
catch (Exception e) {
System.out.println(id + " could not get lock");
}
}
class TransferThread extends Thread {
public TransferThread(SysLock sl) {
this.sl = sl;
}
public void run() {
try {
sl.forever();
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private SysLock sl;
}
}
When I run the main() that is commented (that is, the lock works with
two threads in the same jvm) it works ok, the second TransferThread
cannot get the lock.
But when I run the uncommented main() twice, both processes adquire a
lock, even if only one lock file exists in the lockdir. Something I am
missing probably....
Many thanks
javi
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