Github user bdeggleston commented on a diff in the pull request: https://github.com/apache/cassandra/pull/224#discussion_r189116984 --- Diff: src/java/org/apache/cassandra/locator/Replicas.java --- @@ -0,0 +1,313 @@ +/* + * 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.Collections; +import java.util.Iterator; +import java.util.List; +import java.util.Set; + +import com.google.common.base.Predicate; +import com.google.common.collect.Iterables; +import com.google.common.collect.Sets; + +import org.apache.cassandra.dht.Range; +import org.apache.cassandra.dht.Token; +import org.apache.cassandra.utils.FBUtilities; + +/** + * A collection like class for Replica objects. Since the Replica class contains inetaddress, range, and + * transient replication status, basic contains and remove methods can be ambiguous. Replicas forces you + * to be explicit about what you're checking the container for, or removing from it. + */ +public abstract class Replicas implements Iterable<Replica> +{ + + public abstract boolean add(Replica replica); + public abstract void addAll(Iterable<Replica> replicas); + public abstract void removeEndpoint(InetAddressAndPort endpoint); + public abstract void removeReplica(Replica replica); + public abstract int size(); + + public Iterable<InetAddressAndPort> asEndpoints() + { + return Iterables.transform(this, Replica::getEndpoint); + } + + public Set<InetAddressAndPort> asEndpointSet() + { + Set<InetAddressAndPort> result = Sets.newHashSetWithExpectedSize(size()); + for (Replica replica: this) + { + result.add(replica.getEndpoint()); + } + return result; + } + + public List<InetAddressAndPort> asEndpointList() + { + List<InetAddressAndPort> result = new ArrayList<>(size()); + for (Replica replica: this) + { + result.add(replica.getEndpoint()); + } + return result; + } + + public Iterable<Range<Token>> asRanges() + { + return Iterables.transform(this, Replica::getRange); + } + + public Set<Range<Token>> asRangeSet() + { + Set<Range<Token>> result = Sets.newHashSetWithExpectedSize(size()); + for (Replica replica: this) + { + result.add(replica.getRange()); + } + return result; + } + + public Iterable<Range<Token>> fullRanges() + { + return Iterables.transform(Iterables.filter(this, Replica::isFull), Replica::getRange); + } + + public boolean containsEndpoint(InetAddressAndPort endpoint) + { + return Iterables.any(this, r -> r.getEndpoint().equals(endpoint)); + } + + /** + * Remove by endpoint. Ranges are ignored when determining what to remove + */ + public void removeEndpoints(Replicas toRemove) + { + if (Iterables.all(this, Replica::isFull) && Iterables.all(toRemove, Replica::isFull)) + { + for (Replica remove: toRemove) + { + removeEndpoint(remove.getEndpoint()); + } + } + else + { + // FIXME: add support for transient replicas + throw new UnsupportedOperationException("transient replicas are currently unsupported"); + } + } + + public void removeReplicas(Replicas toRemove) + { + if (Iterables.all(this, Replica::isFull) && Iterables.all(toRemove, Replica::isFull)) + { + for (Replica remove: toRemove) + { + removeReplica(remove); + } + } + else + { + // FIXME: add support for transient replicas + throw new UnsupportedOperationException("transient replicas are currently unsupported"); + } + } + + public boolean isEmpty() + { + return size() == 0; + } + + private static abstract class ImmutableReplicaContainer extends Replicas + { + @Override + public boolean add(Replica replica) + { + throw new UnsupportedOperationException(); + } + + @Override + public void addAll(Iterable<Replica> replicas) + { + throw new UnsupportedOperationException(); + } + + @Override + public void removeEndpoint(InetAddressAndPort endpoint) + { + throw new UnsupportedOperationException(); + } + + @Override + public void removeReplica(Replica replica) + { + throw new UnsupportedOperationException(); + } + } + + public static Replicas filter(Replicas source, Predicate<Replica> predicate) + { + Iterable<Replica> iterable = Iterables.filter(source, predicate); + return new ImmutableReplicaContainer() + { + public int size() + { + return Iterables.size(iterable); + } + + public Iterator<Replica> iterator() + { + return iterable.iterator(); + } + }; + } + + public static Replicas filterOnEndpoints(Replicas source, Predicate<InetAddressAndPort> predicate) + { + Iterable<Replica> iterable = Iterables.filter(source, r -> predicate.apply(r.getEndpoint())); + return new ImmutableReplicaContainer() + { + public int size() + { + return Iterables.size(iterable); + } + + public Iterator<Replica> iterator() + { + return iterable.iterator(); + } + }; + } + + public static Replicas filterLocalEndpoint(Replicas replicas) + { + InetAddressAndPort local = FBUtilities.getBroadcastAddressAndPort(); + return filterOnEndpoints(replicas, e -> !e.equals(local)); + } + + public static Replicas concatNaturalAndPending(Replicas natural, Replicas pending) + { + Iterable<Replica> iterable; + if (Iterables.all(natural, Replica::isFull) && Iterables.all(pending, Replica::isFull)) + { + iterable = Iterables.concat(natural, pending); + } + else + { + // FIXME: add support for transient replicas + throw new UnsupportedOperationException("transient replicas are currently unsupported"); + } + + return new ImmutableReplicaContainer() + { + public int size() + { + return natural.size() + pending.size(); + } + + public Iterator<Replica> iterator() + { + return iterable.iterator(); + } + }; + } + + public static Replicas concat(Iterable<Replicas> replicasIterable) + { + Iterable<Replica> iterable = Iterables.concat(replicasIterable); + return new ImmutableReplicaContainer() + { + public int size() + { + return Iterables.size(iterable); + } + + public Iterator<Replica> iterator() + { + return iterable.iterator(); + } + }; + } + + public static Replicas of(Collection<Replica> replicas) + { + return new ImmutableReplicaContainer() + { + public int size() + { + return replicas.size(); + } + + public Iterator<Replica> iterator() + { + return replicas.iterator(); + } + }; + } + + public static Replicas singleton(Replica replica) + { + return of(Collections.singleton(replica)); --- End diff -- fixed
--- --------------------------------------------------------------------- To unsubscribe, e-mail: pr-unsubscr...@cassandra.apache.org For additional commands, e-mail: pr-h...@cassandra.apache.org