| /* |
| * 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.net; |
| |
| import java.io.IOException; |
| import java.io.Serializable; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.function.BiConsumer; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.common.primitives.Ints; |
| |
| import org.apache.cassandra.db.TypeSizes; |
| import org.apache.cassandra.io.IVersionedSerializer; |
| import org.apache.cassandra.io.util.DataInputPlus; |
| import org.apache.cassandra.io.util.DataOutputPlus; |
| import org.apache.cassandra.locator.InetAddressAndPort; |
| |
| import static org.apache.cassandra.locator.InetAddressAndPort.Serializer.inetAddressAndPortSerializer; |
| import static org.apache.cassandra.net.MessagingService.VERSION_40; |
| import static org.apache.cassandra.utils.vint.VIntCoding.computeUnsignedVIntSize; |
| |
| /** |
| * A container used to store a node -> message_id map for inter-DC write forwarding. |
| * We pick one node in each external DC to forward the message to its local peers. |
| * |
| * TODO: in the next protocol version only serialize peers, message id will become redundant once 3.0 is out of the picture |
| */ |
| public final class ForwardingInfo implements Serializable |
| { |
| final List<InetAddressAndPort> targets; |
| final long[] messageIds; |
| |
| public ForwardingInfo(List<InetAddressAndPort> targets, long[] messageIds) |
| { |
| Preconditions.checkArgument(targets.size() == messageIds.length); |
| this.targets = targets; |
| this.messageIds = messageIds; |
| } |
| |
| /** |
| * @return {@code true} if all host are to use the same message id, {@code false} otherwise. Starting with 4.0 and |
| * above, we should be reusing the same id, always, but it won't always be true until 3.0/3.11 are phased out. |
| */ |
| public boolean useSameMessageID(long id) |
| { |
| for (int i = 0; i < messageIds.length; i++) |
| if (id != messageIds[i]) |
| return false; |
| |
| return true; |
| } |
| |
| /** |
| * Apply the provided consumer to all (host, message_id) pairs. |
| */ |
| public void forEach(BiConsumer<Long, InetAddressAndPort> biConsumer) |
| { |
| for (int i = 0; i < messageIds.length; i++) |
| biConsumer.accept(messageIds[i], targets.get(i)); |
| } |
| |
| static final IVersionedSerializer<ForwardingInfo> serializer = new IVersionedSerializer<ForwardingInfo>() |
| { |
| public void serialize(ForwardingInfo forwardTo, DataOutputPlus out, int version) throws IOException |
| { |
| long[] ids = forwardTo.messageIds; |
| List<InetAddressAndPort> targets = forwardTo.targets; |
| |
| int count = ids.length; |
| if (version >= VERSION_40) |
| out.writeUnsignedVInt(count); |
| else |
| out.writeInt(count); |
| |
| for (int i = 0; i < count; i++) |
| { |
| inetAddressAndPortSerializer.serialize(targets.get(i), out, version); |
| if (version >= VERSION_40) |
| out.writeUnsignedVInt(ids[i]); |
| else |
| out.writeInt(Ints.checkedCast(ids[i])); |
| } |
| } |
| |
| public long serializedSize(ForwardingInfo forwardTo, int version) |
| { |
| long[] ids = forwardTo.messageIds; |
| List<InetAddressAndPort> targets = forwardTo.targets; |
| |
| int count = ids.length; |
| long size = version >= VERSION_40 ? computeUnsignedVIntSize(count) : TypeSizes.sizeof(count); |
| |
| for (int i = 0; i < count; i++) |
| { |
| size += inetAddressAndPortSerializer.serializedSize(targets.get(i), version); |
| size += version >= VERSION_40 ? computeUnsignedVIntSize(ids[i]) : 4; |
| } |
| |
| return size; |
| } |
| |
| public ForwardingInfo deserialize(DataInputPlus in, int version) throws IOException |
| { |
| int count = version >= VERSION_40 ? Ints.checkedCast(in.readUnsignedVInt()) : in.readInt(); |
| |
| long[] ids = new long[count]; |
| List<InetAddressAndPort> targets = new ArrayList<>(count); |
| |
| for (int i = 0; i < count; i++) |
| { |
| targets.add(inetAddressAndPortSerializer.deserialize(in, version)); |
| ids[i] = version >= VERSION_40 ? Ints.checkedCast(in.readUnsignedVInt()) : in.readInt(); |
| } |
| |
| return new ForwardingInfo(targets, ids); |
| } |
| }; |
| } |