/*
* 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.accumulo.core.client.impl;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import org.apache.accumulo.core.Constants;
import org.apache.accumulo.core.client.Instance;
import org.apache.accumulo.core.client.impl.thrift.ClientService;
import org.apache.accumulo.core.conf.Property;
import org.apache.accumulo.core.util.ArgumentChecker;
import org.apache.accumulo.core.util.ServerServices;
import org.apache.accumulo.core.util.ThriftUtil;
import org.apache.accumulo.core.util.ServerServices.Service;
import org.apache.accumulo.core.zookeeper.ZooCache;
import org.apache.accumulo.core.zookeeper.ZooLock;
import org.apache.accumulo.core.zookeeper.ZooUtil;
import org.apache.log4j.Logger;
import org.apache.thrift.TServiceClient;
import org.apache.thrift.transport.TTransport;
import org.apache.thrift.transport.TTransportException;
public class ServerClient {
private static final Logger log = Logger.getLogger(ServerClient.class);
private static final Map<String,ZooCache> zooCaches = new HashMap<String,ZooCache>();
private synchronized static ZooCache getZooCache(Instance instance) {
ZooCache result = zooCaches.get(instance.getZooKeepers());
if (result == null) {
result = new ZooCache(instance.getZooKeepers(), instance.getZooKeepersSessionTimeOut(), null);
zooCaches.put(instance.getZooKeepers(), result);
}
return result;
}
public static synchronized ClientService.Iface getConnection(Instance instance) throws TTransportException {
ArgumentChecker.notNull(instance);
// create list of servers
ArrayList<ThriftTransportKey> servers = new ArrayList<ThriftTransportKey>();
// add tservers
for (String tserver : getZooCache(instance).getChildren(ZooUtil.getRoot(instance) + Constants.ZTSERVERS)) {
byte[] data = ZooLock.getLockData(getZooCache(instance), ZooUtil.getRoot(instance) + Constants.ZTSERVERS + "/" + tserver);
if (data != null && !new String(data).equals("master"))
servers.add(new ThriftTransportKey(new ServerServices(new String(data)).getAddressString(Service.TSERV_CLIENT), instance.getConfiguration().getPort(
Property.TSERV_CLIENTPORT), instance.getConfiguration().getTimeInMillis(Property.GENERAL_RPC_TIMEOUT)));
}
// add masters
for (String master : instance.getMasterLocations())
servers.add(new ThriftTransportKey(master, instance.getConfiguration().getPort(Property.MASTER_CLIENTPORT), instance.getConfiguration().getTimeInMillis(
Property.GENERAL_RPC_TIMEOUT)));
boolean opened = false;
try {
TTransport socket = ThriftTransportPool.getInstance().getAnyTransport(servers);
ClientService.Iface client = ThriftUtil.createClient(new ClientService.Client.Factory(), socket);
opened = true;
return client;
} finally {
if (!opened)
log.warn("Failed to find an available server in the list of servers: " + servers);
}
}
public static void close(ClientService.Iface iface) {
TServiceClient client = (TServiceClient) iface;
if (client != null && client.getInputProtocol() != null && client.getInputProtocol().getTransport() != null) {
ThriftTransportPool.getInstance().returnTransport(client.getInputProtocol().getTransport());
} else {
log.debug("Attempt to close null connection to a server", new Exception());
}
}
}