org.apache.zookeeper.KeeperException.BadVersionException Java Examples

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Example #1
Source File: JZookeeperState.java    From jesos with Apache License 2.0 4 votes vote down vote up 
@Override
public Future<Boolean> expunge(final Variable variable)
{
    checkNotNull(variable, "variable is null");
    checkState(!closed.get(), "already closed");
    checkState(variable instanceof ZookeeperVariable, "can not process native variable, use ZookeeperVariable");

    final ZookeeperVariable v = (ZookeeperVariable) variable;
    final String fullName = getFullPath(v.getName());

    return executor.submit(new Callable<Boolean>() {
        @Override
        public Boolean call() throws Exception
        {
            ZookeeperVariable current = load(fullName);

            while (true) {
                if (current == null) {
                    return false;
                }

                if (!current.getUuid().equals(v.getUuid())) {
                    return false;
                }

                checkState(current.getZookeeperVersion() != null, "expunge with unknown zookeeper version (%s)", current.getEntry());

                try {
                    client.delete(fullName, current.getZookeeperVersion());
                    return true;
                }
                catch (BadVersionException | NoNodeException e) {
                    // Version has changed under us or the node has disappeared. Retry (which will probably fail unless it was deleted).
                    LOG.debug("Could not change version %d, retry expunging", current.getZookeeperVersion());
                }

                // Current could be null here if the node was deleted while we were not looking.
                current = load(fullName);
            }
        }
    });
}