/** Returns true if path exists */
public Boolean exists(final String path, boolean retryOnConnLoss)
throws KeeperException, InterruptedException {
if (retryOnConnLoss) {
return zkCmdExecutor.retryOperation(
new ZkOperation() {
@Override
public Boolean execute() throws KeeperException, InterruptedException {
return keeper.exists(path, null) != null;
}
});
} else {
return keeper.exists(path, null) != null;
}
}
/**
* Return the stat of the node of the given path. Return null if no such a node exists.
*
* <p>If the watch is non-null and the call is successful (no exception is thrown), a watch will
* be left on the node with the given path. The watch will be triggered by a successful operation
* that creates/delete the node or sets the data on the node.
*
* @param path the node path
* @param watcher explicit watcher
* @return the stat of the node of the given path; return null if no such a node exists.
* @throws KeeperException If the server signals an error
* @throws InterruptedException If the server transaction is interrupted.
* @throws IllegalArgumentException if an invalid path is specified
*/
public Stat exists(final String path, final Watcher watcher, boolean retryOnConnLoss)
throws KeeperException, InterruptedException {
if (retryOnConnLoss) {
return zkCmdExecutor.retryOperation(
new ZkOperation() {
@Override
public Stat execute() throws KeeperException, InterruptedException {
return keeper.exists(path, watcher);
}
});
} else {
return keeper.exists(path, watcher);
}
}
