private OperationFuture<String> createLiveNode() {
String liveNode = getLiveNodePath();
LOG.info("Create live node " + liveNode);
JsonObject content = new JsonObject();
content.add("data", liveNodeData.get());
return ZKOperations.ignoreError(
zkClient.create(liveNode, encodeJson(content), CreateMode.EPHEMERAL),
KeeperException.NodeExistsException.class,
liveNode);
}
/** Deletes the given ZK path recursively and create the path again. */
private ListenableFuture<String> deleteAndCreate(
final String path, final byte[] data, final CreateMode mode) {
return Futures.transform(
ZKOperations.ignoreError(
ZKOperations.recursiveDelete(zkClient, path),
KeeperException.NoNodeException.class,
null),
new AsyncFunction<String, String>() {
@Override
public ListenableFuture<String> apply(String input) throws Exception {
return zkClient.create(path, data, mode);
}
},
Threads.SAME_THREAD_EXECUTOR);
}
private OperationFuture<String> removeLiveNode() {
String liveNode = getLiveNodePath();
LOG.info("Remove live node " + liveNode);
return ZKOperations.ignoreError(
zkClient.delete(liveNode), KeeperException.NoNodeException.class, liveNode);
}