/**
*
*/
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.net.UnknownHostException;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.locator.IEndPointSnitch;
import org.apache.cassandra.locator.DatacenterEndPointSnitch;
import org.apache.cassandra.net.Message;
import org.apache.cassandra.utils.FBUtilities;
/**
* This class will basically will block for the replication factor which is
* provided in the input map. it will block till we recive response from (DC, n)
* nodes.
*/
public class DatacenterWriteResponseHandler extends WriteResponseHandler
{
private final AtomicInteger blockFor;
private final DatacenterEndPointSnitch endpointsnitch;
private final InetAddress localEndpoint;
public DatacenterWriteResponseHandler(int blockFor, String table)
{
// Response is been managed by the map so the waitlist size really doesnt matter.
super(blockFor, table);
this.blockFor = new AtomicInteger(blockFor);
endpointsnitch = (DatacenterEndPointSnitch) DatabaseDescriptor.getEndPointSnitch(table);
localEndpoint = FBUtilities.getLocalAddress();
}
@Override
public void response(Message message)
{
//Is optimal to check if same datacenter than comparing Arrays.
int b = -1;
try
{
if (endpointsnitch.isInSameDataCenter(localEndpoint, message.getFrom()))
{
b = blockFor.decrementAndGet();
}
}
catch (UnknownHostException e)
{
throw new RuntimeException(e);
}
responses.add(message);
if (b == 0)
{
//Singnal when Quorum is recived.
condition.signal();
}
if (logger.isDebugEnabled())
logger.debug("Processed Message: " + message.toString());
}
}