/** Adds a job into the configuration. */
@Override
public void addJob(final Job job) throws JobExistsException {
log.info("adding job: {}", job);
final JobId id = job.getId();
final UUID operationId = UUID.randomUUID();
final String creationPath = Paths.configJobCreation(id, operationId);
final ZooKeeperClient client = provider.get("addJob");
try {
try {
client.ensurePath(Paths.historyJob(id));
client.transaction(
create(Paths.configJob(id), job),
create(Paths.configJobRefShort(id), id),
create(Paths.configJobHosts(id)),
create(creationPath));
} catch (final NodeExistsException e) {
if (client.exists(creationPath) != null) {
// The job was created, we're done here
return;
}
throw new JobExistsException(id.toString());
}
} catch (final KeeperException e) {
throw new HeliosRuntimeException("adding job " + job + " failed", e);
}
}
/**
* Registers a host into ZooKeeper. The {@code id} is initially generated randomly by the Agent
* and persisted on disk. This way, in the event that you have two agents attempting to register
* with the same value of @{code host}, the first one will win.
*/
@Override
public void registerHost(final String host, final String id) {
log.info("registering host: {}", host);
final ZooKeeperClient client = provider.get("registerHost");
try {
// TODO (dano): this code is replicated in AgentZooKeeperRegistrar
// This would've been nice to do in a transaction but PathChildrenCache ensures paths
// so we can't know what paths already exist so assembling a suitable transaction is too
// painful.
client.ensurePath(Paths.configHost(host));
client.ensurePath(Paths.configHostJobs(host));
client.ensurePath(Paths.configHostPorts(host));
client.ensurePath(Paths.statusHost(host));
client.ensurePath(Paths.statusHostJobs(host));
// Finish registration by creating the id node last
client.createAndSetData(Paths.configHostId(host), id.getBytes(UTF_8));
} catch (Exception e) {
throw new HeliosRuntimeException("registering host " + host + " failed", e);
}
}