/*
* 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.cassandra.service;
import java.net.InetAddress;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import org.apache.cassandra.db.ConsistencyLevel;
import org.apache.cassandra.db.ReadResponse;
import org.apache.cassandra.db.Table;
import org.apache.cassandra.exceptions.UnavailableException;
import org.apache.cassandra.locator.NetworkTopologyStrategy;
import org.apache.cassandra.net.MessageIn;
import org.apache.thrift.protocol.TMessage;
/**
* Datacenter Quorum response handler blocks for a quorum of responses from the local DC
*/
public class DatacenterReadCallback<TMessage, TResolved> extends ReadCallback<TMessage, TResolved>
{
private static final Comparator<InetAddress> localComparator = new Comparator<InetAddress>()
{
public int compare(InetAddress endpoint1, InetAddress endpoint2)
{
boolean local1 = localdc.equals(snitch.getDatacenter(endpoint1));
boolean local2 = localdc.equals(snitch.getDatacenter(endpoint2));
if (local1 && !local2)
return -1;
if (local2 && !local1)
return 1;
return 0;
}
};
public DatacenterReadCallback(IResponseResolver resolver, ConsistencyLevel consistencyLevel, IReadCommand command, List<InetAddress> endpoints)
{
super(resolver, consistencyLevel, command, endpoints);
}
@Override
protected void sortForConsistencyLevel(List<InetAddress> endpoints)
{
Collections.sort(endpoints, localComparator);
}
@Override
protected boolean waitingFor(MessageIn message)
{
return localdc.equals(snitch.getDatacenter(message.from));
}
@Override
public void assureSufficientLiveNodes() throws UnavailableException
{
int localEndpoints = 0;
for (InetAddress endpoint : endpoints)
{
if (localdc.equals(snitch.getDatacenter(endpoint)))
localEndpoints++;
}
if (localEndpoints < blockfor)
{
if (logger.isDebugEnabled())
{
StringBuilder builder = new StringBuilder("Local replicas [");
for (InetAddress endpoint : endpoints)
{
if (localdc.equals(snitch.getDatacenter(endpoint)))
builder.append(endpoint).append(",");
}
builder.append("] are insufficient to satisfy LOCAL_QUORUM requirement of ").append(blockfor).append(" live nodes in '").append(localdc).append("'");
logger.debug(builder.toString());
}
throw new UnavailableException(consistencyLevel, blockfor, localEndpoints);
}
}
}