| /* |
| * 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.locator; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.function.Predicate; |
| |
| import com.carrotsearch.hppc.ObjectIntHashMap; |
| import com.carrotsearch.hppc.ObjectObjectHashMap; |
| import com.google.common.collect.Iterables; |
| import org.apache.cassandra.config.DatabaseDescriptor; |
| |
| import static com.google.common.collect.Iterables.all; |
| |
| public class Replicas |
| { |
| |
| public static int countFull(ReplicaCollection<?> replicas) |
| { |
| int count = 0; |
| for (Replica replica : replicas) |
| if (replica.isFull()) |
| ++count; |
| return count; |
| } |
| |
| public static class ReplicaCount |
| { |
| int fullReplicas; |
| int transientReplicas; |
| |
| public int allReplicas() |
| { |
| return fullReplicas + transientReplicas; |
| } |
| |
| public int fullReplicas() |
| { |
| return fullReplicas; |
| } |
| |
| public int transientReplicas() |
| { |
| return transientReplicas; |
| } |
| |
| public void increment(Replica replica) |
| { |
| if (replica.isFull()) ++fullReplicas; |
| else ++transientReplicas; |
| } |
| |
| public boolean hasAtleast(int allReplicas, int fullReplicas) |
| { |
| return this.fullReplicas >= fullReplicas |
| && this.allReplicas() >= allReplicas; |
| } |
| } |
| |
| public static ReplicaCount countInOurDc(ReplicaCollection<?> replicas) |
| { |
| ReplicaCount count = new ReplicaCount(); |
| Predicate<Replica> inOurDc = InOurDcTester.replicas(); |
| for (Replica replica : replicas) |
| if (inOurDc.test(replica)) |
| count.increment(replica); |
| return count; |
| } |
| |
| /** |
| * count the number of full and transient replicas, separately, for each DC |
| */ |
| public static ObjectObjectHashMap<String, ReplicaCount> countPerDc(Collection<String> dataCenters, Iterable<Replica> replicas) |
| { |
| ObjectObjectHashMap<String, ReplicaCount> perDc = new ObjectObjectHashMap<>(dataCenters.size()); |
| for (String dc: dataCenters) |
| perDc.put(dc, new ReplicaCount()); |
| |
| IEndpointSnitch snitch = DatabaseDescriptor.getEndpointSnitch(); |
| for (Replica replica : replicas) |
| { |
| String dc = snitch.getDatacenter(replica); |
| perDc.get(dc).increment(replica); |
| } |
| return perDc; |
| } |
| |
| /** |
| * increment each of the map's DC entries for each matching replica provided |
| */ |
| public static void addToCountPerDc(ObjectIntHashMap<String> perDc, Iterable<Replica> replicas, int add) |
| { |
| IEndpointSnitch snitch = DatabaseDescriptor.getEndpointSnitch(); |
| for (Replica replica : replicas) |
| { |
| String dc = snitch.getDatacenter(replica); |
| perDc.addTo(dc, add); |
| } |
| } |
| |
| /** |
| * A placeholder for areas of the code that cannot yet handle transient replicas, but should do so in future |
| */ |
| public static void temporaryAssertFull(Replica replica) |
| { |
| if (!replica.isFull()) |
| { |
| throw new UnsupportedOperationException("transient replicas are currently unsupported: " + replica); |
| } |
| } |
| |
| /** |
| * A placeholder for areas of the code that cannot yet handle transient replicas, but should do so in future |
| */ |
| public static void temporaryAssertFull(Iterable<Replica> replicas) |
| { |
| if (!all(replicas, Replica::isFull)) |
| { |
| throw new UnsupportedOperationException("transient replicas are currently unsupported: " + Iterables.toString(replicas)); |
| } |
| } |
| |
| /** |
| * For areas of the code that should never see a transient replica |
| */ |
| public static void assertFull(Iterable<Replica> replicas) |
| { |
| if (!all(replicas, Replica::isFull)) |
| { |
| throw new UnsupportedOperationException("transient replicas are currently unsupported: " + Iterables.toString(replicas)); |
| } |
| } |
| |
| public static List<String> stringify(ReplicaCollection<?> replicas, boolean withPort) |
| { |
| List<String> stringEndpoints = new ArrayList<>(replicas.size()); |
| for (Replica replica: replicas) |
| { |
| stringEndpoints.add(replica.endpoint().getHostAddress(withPort)); |
| } |
| return stringEndpoints; |
| } |
| |
| } |