private String generatePoolId() throws UnsupportedEncodingException, NoSuchAlgorithmException {
synchronized (lock) {
String newId = String.valueOf(startingPoint++) + "-" + serverId;
MessageDigest md = MessageDigest.getInstance("SHA-1");
return StringUtils.encode(md.digest(newId.getBytes("UTF-8")), ENCODING);
}
}
@Test
public void testId() {
for (int i = 0; i < 10; i++) {
Thread t =
new Thread(
new Runnable() {
public void run() {
synchronized (lockObject) {
nrunning++;
}
try {
for (int j = 0; j < 100; j++) {
BigInteger id = getId();
assertFalse("Failed for " + id + " after " + j, hash.containsKey(id));
hash.put(id, id);
}
} finally {
synchronized (lockObject) {
nrunning--;
}
}
}
});
t.start();
}
do {
LOGGER.info("Running " + nrunning + " Hash Size is " + hash.size());
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
LOGGER.info(e.getMessage(), e);
}
} while (nrunning > 0);
for (Entry<BigInteger, BigInteger> e : hash.entrySet()) {
LOGGER.info(
" Entry is "
+ e.getValue()
+ " "
+ StringUtils.encode(e.getValue().toByteArray(), StringUtils.URL_SAFE_ENCODING).trim()
+ " Epoch "
+ String.valueOf(epoch)
+ " Size "
+ String.valueOf(System.currentTimeMillis() - epoch));
}
}
private String hash(String poolId) throws NoSuchAlgorithmException, UnsupportedEncodingException {
MessageDigest md = MessageDigest.getInstance("SHA-1");
String encodedId = StringUtils.encode(md.digest(poolId.getBytes("UTF-8")), HASHENCODING);
LOGGER.info("Hashing [{}] gave [{}] ", poolId, encodedId);
return "/_p/"
+ encodedId.charAt(0)
+ "/"
+ encodedId.substring(1, 3)
+ "/"
+ encodedId.substring(3, 5)
+ "/"
+ encodedId.substring(5, 7)
+ "/"
+ poolId;
}
