/*
* 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.repair;
import org.apache.cassandra.config.DatabaseDescriptor;
import java.net.InetAddress;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.Queue;
public class DatacenterAwareRequestCoordinator implements IRequestCoordinator<InetAddress>
{
private Map<String, Queue<InetAddress>> requestsByDatacenter = new HashMap<>();
private int remaining = 0;
private final IRequestProcessor<InetAddress> processor;
protected DatacenterAwareRequestCoordinator(IRequestProcessor<InetAddress> processor)
{
this.processor = processor;
}
public void add(InetAddress request)
{
String dc = DatabaseDescriptor.getEndpointSnitch().getDatacenter(request);
Queue<InetAddress> queue = requestsByDatacenter.get(dc);
if (queue == null)
{
queue = new LinkedList<>();
requestsByDatacenter.put(dc, queue);
}
queue.add(request);
remaining++;
}
public void start()
{
for (Queue<InetAddress> requests : requestsByDatacenter.values())
{
if (!requests.isEmpty())
processor.process(requests.peek());
}
}
// Returns how many request remains
public int completed(InetAddress request)
{
String dc = DatabaseDescriptor.getEndpointSnitch().getDatacenter(request);
Queue<InetAddress> requests = requestsByDatacenter.get(dc);
assert requests != null;
assert request.equals(requests.peek());
requests.poll();
if (!requests.isEmpty())
processor.process(requests.peek());
return --remaining;
}
}