/**
* (c) Copyright 2014 WibiData, Inc.
*
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.kiji.schema.zookeeper;
import java.io.Closeable;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.recipes.nodes.PersistentEphemeralNode;
import org.apache.curator.framework.recipes.nodes.PersistentEphemeralNode.Mode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.kiji.schema.KijiURI;
/**
* Registers an instance user with ZooKeeper.
*/
public final class InstanceUserRegistration implements Closeable {
private static final Logger LOG = LoggerFactory.getLogger(InstanceUserRegistration.class);
private final PersistentEphemeralNode mNode;
private final KijiURI mInstanceURI;
/**
* Create an instance user registration for the instance with the provided KijiURI. The actual
* registration will take place once #start() is called.
*
* @param zkClient used for connecting to ZooKeeper.
* @param instanceURI of instance being registered.
* @param userID of user to register.
* @param systemVersion of user to register.
*/
public InstanceUserRegistration(
CuratorFramework zkClient,
KijiURI instanceURI,
String userID,
String systemVersion) {
mInstanceURI = instanceURI;
String path = ZooKeeperUtils.getInstanceUsersDir(mInstanceURI).getPath();
String node = ZooKeeperUtils.makeZKNodeName(userID, systemVersion);
mNode = new PersistentEphemeralNode(zkClient, Mode.EPHEMERAL, path + "/" + node, new byte[] {});
LOG.debug("Creating instance user registration for instance {}.", mInstanceURI);
}
/**
* Start the instance user registration. This will block the thread until the instance user is
* successfully registered.
*
* @return this.
*/
public InstanceUserRegistration start() {
mNode.start();
try {
mNode.waitForInitialCreate(42, TimeUnit.DAYS); // Wait forever
} catch (InterruptedException e) {
LOG.info("Interrupted while attempting to register instance user.");
Thread.currentThread().interrupt();
}
return this;
}
/** {@inheritDoc}. */
@Override
public void close() throws IOException {
// It would be nice to log user info here, but not worth the trip to ZK
LOG.debug("Closing instance user registration for instance {}.", mInstanceURI);
mNode.close();
}
}