/**
* Starts the operation if operation with such nonce has not already succeeded. If the operation
* is in progress, waits for it to end and checks whether it has succeeded.
*
* @param group Nonce group.
* @param nonce Nonce.
* @param stoppable Stoppable that terminates waiting (if any) when the server is stopped.
* @return true if the operation has not already succeeded and can proceed; false otherwise.
*/
public boolean startOperation(long group, long nonce, Stoppable stoppable)
throws InterruptedException {
if (nonce == HConstants.NO_NONCE) return true;
NonceKey nk = new NonceKey(group, nonce);
OperationContext ctx = new OperationContext();
while (true) {
OperationContext oldResult = nonces.putIfAbsent(nk, ctx);
if (oldResult == null) return true;
// Collision with some operation - should be extremely rare.
synchronized (oldResult) {
int oldState = oldResult.getState();
LOG.debug("Conflict detected by nonce: " + nk + ", " + oldResult);
if (oldState != OperationContext.WAIT) {
return oldState == OperationContext.PROCEED; // operation ended
}
oldResult.setHasWait();
oldResult.wait(this.conflictWaitIterationMs); // operation is still active... wait and loop
if (stoppable.isStopped()) {
throw new InterruptedException("Server stopped");
}
}
}
}
@After
public void teardown() throws IOException, KeeperException {
stopper.stop("");
slm.stop();
TEST_UTIL.shutdownMiniZKCluster();
}
/** @throws java.lang.Exception */
@AfterClass
public static void tearDownAfterClass() throws Exception {
STOPPABLE.stop("Shutting down");
TEST_UTIL.shutdownMiniCluster();
}
