/*
* 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 com.facebook.presto.cassandra;
import com.google.common.collect.ImmutableMap;
import com.google.inject.Inject;
import io.airlift.log.Logger;
import org.apache.cassandra.thrift.Cassandra;
import org.apache.cassandra.thrift.ITransportFactory;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.transport.TTransport;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class CassandraThriftConnectionFactory
{
private static final Logger log = Logger.get(CassandraThriftConnectionFactory.class);
private final int port;
private final List<String> addresses;
private final String factoryClassName;
private final Map<String, String> transportFactoryOptions;
@Inject
public CassandraThriftConnectionFactory(CassandraClientConfig config)
{
this.addresses = config.getContactPoints();
this.port = config.getThriftPort();
this.factoryClassName = config.getThriftConnectionFactoryClassName();
this.transportFactoryOptions = ImmutableMap.copyOf(config.getTransportFactoryOptions());
}
public Cassandra.Client create()
{
try {
return getClientFromAddressList();
}
catch (IOException e) {
throw new RuntimeException(e);
}
}
private Cassandra.Client getClientFromAddressList() throws IOException
{
List<IOException> exceptions = new ArrayList<IOException>();
for (String address : addresses) {
try {
return createConnection(address, port, factoryClassName);
}
catch (IOException ioe) {
exceptions.add(ioe);
}
}
log.error("failed to connect to any initial addresses");
for (IOException exception : exceptions) {
log.error(exception);
}
throw exceptions.get(exceptions.size() - 1);
}
public Cassandra.Client createConnection(String host, Integer port, String factoryClassName) throws IOException
{
try {
TTransport transport = getClientTransportFactory(factoryClassName).openTransport(host, port);
return new Cassandra.Client(new TBinaryProtocol(transport, true, true));
}
catch (Exception e) {
throw new IOException("Unable to connect to server " + host + ":" + port, e);
}
}
private ITransportFactory getClientTransportFactory(String factoryClassName)
{
try {
ITransportFactory factory = (ITransportFactory) Class.forName(factoryClassName).newInstance();
Map<String, String> options = getOptions(factory.supportedOptions());
factory.setOptions(options);
return factory;
}
catch (Exception e) {
throw new RuntimeException("Failed to instantiate transport factory:" + factoryClassName, e);
}
}
private Map<String, String> getOptions(Set<String> supportedOptions)
{
Map<String, String> options = new HashMap<>();
for (String optionKey : supportedOptions) {
String optionValue = transportFactoryOptions.get(optionKey);
if (optionValue != null) {
options.put(optionKey, optionValue);
}
}
return options;
}
}