/**
* Creates the serialized value of the object and stores this in ZooKeeper under the path. It
* updates the lastStatusVersion. It does not set a watcher for the path.
*/
private void updateCoordinateData() throws CoordinateMissingException, CloudnameException {
if (!started.get()) {
throw new IllegalStateException("Not started.");
}
if (!zkClient.isConnected()) {
throw new CloudnameException("No proper connection with zookeeper.");
}
synchronized (lastStatusVersionMonitor) {
try {
Stat stat =
zkClient
.getZookeeper()
.setData(
path,
zkCoordinateData.snapshot().serialize().getBytes(Util.CHARSET_NAME),
lastStatusVersion);
LOG.fine("Updated coordinate, latest version is " + stat.getVersion());
lastStatusVersion = stat.getVersion();
} catch (KeeperException.NoNodeException e) {
throw new CoordinateMissingException("Coordinate does not exist " + path);
} catch (KeeperException e) {
throw new CloudnameException(
"ZooKeeper errror in updateCoordinateData: " + e.getMessage(), e);
} catch (UnsupportedEncodingException e) {
throw new CloudnameException(e);
} catch (InterruptedException e) {
throw new CloudnameException(e);
} catch (IOException e) {
throw new CloudnameException(e);
}
}
}
private void tryClaim() {
try {
zkClient
.getZookeeper()
.create(
path,
zkCoordinateData.snapshot().serialize().getBytes(Util.CHARSET_NAME),
ZooDefs.Ids.OPEN_ACL_UNSAFE,
CreateMode.EPHEMERAL,
new ClaimCallback(),
this);
} catch (IOException e) {
LOG.info("Got IO exception on claim with new ZooKeeper instance " + e.getMessage());
}
}
/**
* Creates a string for debugging etc
*
* @return serialized version of the instance data.
*/
public synchronized String toString() {
return zkCoordinateData.snapshot().toString();
}
/**
* Remove endpoints and persist it. Requires that this instance owns the tryClaim to the
* coordinate.
*
* @param names names of endpoints to be removed.
*/
public void removeEndpoints(final List<String> names)
throws CloudnameException, CoordinateMissingException {
zkCoordinateData.removeEndpoints(names);
updateCoordinateData();
}
/**
* Adds new endpoints and persist them. Requires that this instance owns the tryClaim to the
* coordinate.
*
* @param newEndpoints endpoints to be added.
*/
public void putEndpoints(final List<Endpoint> newEndpoints)
throws CloudnameException, CoordinateMissingException {
zkCoordinateData.putEndpoints(newEndpoints);
updateCoordinateData();
}
/**
* Updates the ServiceStatus and persists it. Only allowed if we claimed the coordinate.
*
* @param status The new value for serviceStatus.
*/
public void updateStatus(final ServiceStatus status)
throws CloudnameException, CoordinateMissingException {
zkCoordinateData.setStatus(status);
updateCoordinateData();
}