/**
*
*/
package org.apache.cassandra.service;
/*
*
* 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.
*
*/
import java.net.InetAddress;
import java.util.Collection;
import com.google.common.collect.Multimap;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.db.Table;
import org.apache.cassandra.locator.IEndpointSnitch;
import org.apache.cassandra.locator.NetworkTopologyStrategy;
import org.apache.cassandra.net.Message;
import org.apache.cassandra.thrift.ConsistencyLevel;
import org.apache.cassandra.thrift.UnavailableException;
import org.apache.cassandra.utils.FBUtilities;
/**
* This class blocks for a quorum of responses _in the local datacenter only_ (CL.LOCAL_QUORUM).
*/
public class DatacenterWriteResponseHandler extends WriteResponseHandler
{
private static final IEndpointSnitch snitch = DatabaseDescriptor.getEndpointSnitch();
private static final String localdc;
static
{
localdc = snitch.getDatacenter(FBUtilities.getLocalAddress());
}
protected DatacenterWriteResponseHandler(Collection<InetAddress> writeEndpoints, Multimap<InetAddress, InetAddress> hintedEndpoints, ConsistencyLevel consistencyLevel, String table)
{
super(writeEndpoints, hintedEndpoints, consistencyLevel, table);
assert consistencyLevel == ConsistencyLevel.LOCAL_QUORUM;
}
public static IWriteResponseHandler create(Collection<InetAddress> writeEndpoints, Multimap<InetAddress, InetAddress> hintedEndpoints, ConsistencyLevel consistencyLevel, String table)
{
return new DatacenterWriteResponseHandler(writeEndpoints, hintedEndpoints, consistencyLevel, table);
}
@Override
protected int determineBlockFor(String table)
{
NetworkTopologyStrategy strategy = (NetworkTopologyStrategy) Table.open(table).getReplicationStrategy();
return (strategy.getReplicationFactor(localdc) / 2) + 1;
}
@Override
public void response(Message message)
{
if (message == null || localdc.equals(snitch.getDatacenter(message.getFrom())))
{
if (responses.decrementAndGet() == 0)
condition.signal();
}
}
@Override
public void assureSufficientLiveNodes() throws UnavailableException
{
int liveNodes = 0;
for (InetAddress destination : writeEndpoints)
{
if (localdc.equals(snitch.getDatacenter(destination)))
liveNodes++;
}
if (liveNodes < responses.get())
{
throw new UnavailableException();
}
}
}