/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.hadoop.hdfs.notifier.server;
import org.apache.hadoop.hdfs.notifier.ClientConnectionException;
import org.apache.hadoop.hdfs.notifier.ClientNotSubscribedException;
import org.apache.hadoop.hdfs.notifier.InvalidClientIdException;
import org.apache.hadoop.hdfs.notifier.InvalidTokenException;
import org.apache.hadoop.hdfs.notifier.NamespaceEvent;
import org.apache.hadoop.hdfs.notifier.RampUpException;
import org.apache.hadoop.hdfs.notifier.ServerHandler;
import org.apache.hadoop.hdfs.notifier.TransactionIdTooOldException;
import org.apache.thrift.TException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class ServerHandlerImpl implements ServerHandler.Iface {
public static final Log LOG = LogFactory.getLog(ServerHandlerImpl.class);
private IServerCore core;
public ServerHandlerImpl(IServerCore core) {
this.core = core;
}
@Override
public void subscribe(long clientId, NamespaceEvent subscribedEvent,
long txId) throws InvalidClientIdException, TransactionIdTooOldException,
TException {
core.getMetrics().subscribeCalls.inc();
if (!core.isRegistered(clientId)) {
throw new InvalidClientIdException("Invalid client id: " + clientId);
}
core.subscribeClient(clientId, subscribedEvent, txId);
}
@Override
public void unsubscribe(long clientId, NamespaceEvent subscribedEvent)
throws InvalidClientIdException, TException, ClientNotSubscribedException {
core.getMetrics().unsubscribeCalls.inc();
if (!core.isRegistered(clientId)) {
throw new InvalidClientIdException("Invalid client id: " + clientId);
}
core.unsubscribeClient(clientId, subscribedEvent);
}
@Override
public void registerClient(String host, int port, long token)
throws RampUpException, TException, ClientConnectionException {
core.getMetrics().registerClientCalls.inc();
if (core.getHistory().isRampUp()) {
throw new RampUpException("Currently in ramp-up phase.");
}
// Add the client to our internal data structures
ClientData clientData;
long clientId;
try {
clientId = core.addClientAndConnect(host, port);
} catch (Exception e) {
throw new ClientConnectionException("Failed to connect to client "
+ " on host " + host + " and port " + port);
}
clientData = core.getClientData(clientId);
try {
clientData.handler.registerServer(clientId, core.getId(), token);
} catch (InvalidTokenException e) {
LOG.warn("Client rejected our token. clientId = " + clientId +
". token = " + token, e);
// Remove the client from our internal structures
core.removeClient(clientId);
// Raise an exception here since the client rejected us
throw new ClientConnectionException("Token rejected");
}
}
@Override
public void unregisterClient(long clientId) throws InvalidClientIdException,
TException {
core.getMetrics().unregisterClientCalls.inc();
if (!core.removeClient(clientId)) {
LOG.warn("Invalid request to remove client with id: " + clientId);
throw new InvalidClientIdException("Invalid client id: " + clientId);
}
}
}