| /* |
| * 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.Collection; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.apache.cassandra.config.DatabaseDescriptor; |
| import org.apache.cassandra.db.Keyspace; |
| import org.apache.cassandra.locator.IEndpointSnitch; |
| import org.apache.cassandra.locator.NetworkTopologyStrategy; |
| import org.apache.cassandra.net.MessageIn; |
| import org.apache.cassandra.db.ConsistencyLevel; |
| import org.apache.cassandra.db.WriteType; |
| |
| /** |
| * This class blocks for a quorum of responses _in all datacenters_ (CL.EACH_QUORUM). |
| */ |
| public class DatacenterSyncWriteResponseHandler<T> extends AbstractWriteResponseHandler<T> |
| { |
| private static final IEndpointSnitch snitch = DatabaseDescriptor.getEndpointSnitch(); |
| |
| private final Map<String, AtomicInteger> responses = new HashMap<String, AtomicInteger>(); |
| private final AtomicInteger acks = new AtomicInteger(0); |
| |
| public DatacenterSyncWriteResponseHandler(Collection<InetAddress> naturalEndpoints, |
| Collection<InetAddress> pendingEndpoints, |
| ConsistencyLevel consistencyLevel, |
| Keyspace keyspace, |
| Runnable callback, |
| WriteType writeType, |
| long queryStartNanoTime) |
| { |
| // Response is been managed by the map so make it 1 for the superclass. |
| super(keyspace, naturalEndpoints, pendingEndpoints, consistencyLevel, callback, writeType, queryStartNanoTime); |
| assert consistencyLevel == ConsistencyLevel.EACH_QUORUM; |
| |
| NetworkTopologyStrategy strategy = (NetworkTopologyStrategy) keyspace.getReplicationStrategy(); |
| |
| for (String dc : strategy.getDatacenters()) |
| { |
| int rf = strategy.getReplicationFactor(dc); |
| responses.put(dc, new AtomicInteger((rf / 2) + 1)); |
| } |
| |
| // During bootstrap, we have to include the pending endpoints or we may fail the consistency level |
| // guarantees (see #833) |
| for (InetAddress pending : pendingEndpoints) |
| { |
| responses.get(snitch.getDatacenter(pending)).incrementAndGet(); |
| } |
| } |
| |
| public void response(MessageIn<T> message) |
| { |
| String dataCenter = message == null |
| ? DatabaseDescriptor.getLocalDataCenter() |
| : snitch.getDatacenter(message.from); |
| |
| responses.get(dataCenter).getAndDecrement(); |
| acks.incrementAndGet(); |
| |
| for (AtomicInteger i : responses.values()) |
| { |
| if (i.get() > 0) |
| return; |
| } |
| |
| // all the quorum conditions are met |
| signal(); |
| } |
| |
| protected int ackCount() |
| { |
| return acks.get(); |
| } |
| |
| public boolean isLatencyForSnitch() |
| { |
| return false; |
| } |
| } |