/*
* 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.List;
import org.apache.accumulo.core.client.Instance;
import org.apache.accumulo.core.conf.Property;
import org.apache.accumulo.core.master.thrift.MasterClientService;
import org.apache.accumulo.core.util.ArgumentChecker;
import org.apache.accumulo.core.util.ThriftUtil;
import org.apache.accumulo.core.util.UtilWaitThread;
import org.apache.log4j.Logger;
import org.apache.thrift.TServiceClient;
import org.apache.thrift.transport.TTransportException;
public class MasterClient {
private static final Logger log = Logger.getLogger(MasterClient.class);
public static synchronized MasterClientService.Iface getConnection(Instance instance) throws TTransportException {
ArgumentChecker.notNull(instance);
return getConnection(instance, true);
}
public static synchronized MasterClientService.Iface getConnection(Instance instance, boolean retry) throws TTransportException {
ArgumentChecker.notNull(instance);
do {
List<String> locations = instance.getMasterLocations();
while (locations.size() == 0) {
log.debug("No masters, will retry...");
UtilWaitThread.sleep(250);
locations = instance.getMasterLocations();
}
String master = locations.get(0);
int portHint = instance.getConfiguration().getPort(Property.MASTER_CLIENTPORT);
try {
// Master requests can take a long time: don't ever time out
MasterClientService.Iface client = ThriftUtil.getClient(new MasterClientService.Client.Factory(), master, Property.MASTER_CLIENTPORT,
instance.getConfiguration());
return client;
} catch (TTransportException tte) {
log.debug("Failed to connect to master=" + master + " portHint=" + portHint + (retry ? ", will retry... " : ""), tte);
}
UtilWaitThread.sleep(250);
} while (retry);
return null;
}
public static void close(MasterClientService.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 the master", new Exception());
}
}
}