| /* |
| * 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.ratis.server.impl; |
| |
| import org.apache.ratis.proto.RaftProtos.MessageStreamRequestTypeProto; |
| import org.apache.ratis.protocol.ClientInvocationId; |
| import org.apache.ratis.protocol.Message; |
| import org.apache.ratis.protocol.RaftClientRequest; |
| import org.apache.ratis.protocol.exceptions.StreamException; |
| import org.apache.ratis.thirdparty.com.google.protobuf.ByteString; |
| import org.apache.ratis.util.JavaUtils; |
| import org.apache.ratis.util.Preconditions; |
| import org.apache.ratis.util.ReferenceCountedObject; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.HashMap; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.CompletableFuture; |
| |
| class MessageStreamRequests { |
| public static final Logger LOG = LoggerFactory.getLogger(MessageStreamRequests.class); |
| |
| private static class PendingStream { |
| private final ClientInvocationId key; |
| private long nextId = -1; |
| private ByteString bytes = ByteString.EMPTY; |
| private final List<ReferenceCountedObject<RaftClientRequest>> pendingRefs = new LinkedList<>(); |
| |
| PendingStream(ClientInvocationId key) { |
| this.key = key; |
| } |
| |
| synchronized CompletableFuture<ByteString> append(long messageId, |
| ReferenceCountedObject<RaftClientRequest> requestRef) { |
| if (nextId == -1) { |
| nextId = messageId; |
| } else if (messageId != nextId) { |
| return JavaUtils.completeExceptionally(new StreamException( |
| "Unexpected message id in " + key + ": messageId = " + messageId + " != nextId = " + nextId)); |
| } |
| nextId++; |
| final Message message = requestRef.retain().getMessage(); |
| pendingRefs.add(requestRef); |
| bytes = bytes.concat(message.getContent()); |
| return CompletableFuture.completedFuture(bytes); |
| } |
| |
| synchronized CompletableFuture<ReferenceCountedObject<RaftClientRequest>> getWriteRequest(long messageId, |
| ReferenceCountedObject<RaftClientRequest> requestRef) { |
| return append(messageId, requestRef) |
| .thenApply(appended -> RaftClientRequest.toWriteRequest(requestRef.get(), () -> appended)) |
| .thenApply(request -> ReferenceCountedObject.delegateFrom(pendingRefs, request)); |
| } |
| |
| synchronized void clear() { |
| pendingRefs.forEach(ReferenceCountedObject::release); |
| pendingRefs.clear(); |
| } |
| } |
| |
| static class StreamMap { |
| private final Map<ClientInvocationId, PendingStream> map = new HashMap<>(); |
| |
| synchronized PendingStream computeIfAbsent(ClientInvocationId key) { |
| return map.computeIfAbsent(key, PendingStream::new); |
| } |
| |
| synchronized PendingStream remove(ClientInvocationId key) { |
| return map.remove(key); |
| } |
| |
| synchronized void clear() { |
| map.values().forEach(PendingStream::clear); |
| map.clear(); |
| } |
| } |
| |
| private final String name; |
| private final StreamMap streams = new StreamMap(); |
| |
| MessageStreamRequests(Object name) { |
| this.name = name + "-" + JavaUtils.getClassSimpleName(getClass()); |
| } |
| |
| CompletableFuture<?> streamAsync(ReferenceCountedObject<RaftClientRequest> requestRef) { |
| final RaftClientRequest request = requestRef.get(); |
| final MessageStreamRequestTypeProto stream = request.getType().getMessageStream(); |
| Preconditions.assertTrue(!stream.getEndOfRequest()); |
| final ClientInvocationId key = ClientInvocationId.valueOf(request.getClientId(), stream.getStreamId()); |
| final PendingStream pending = streams.computeIfAbsent(key); |
| return pending.append(stream.getMessageId(), requestRef); |
| } |
| |
| CompletableFuture<ReferenceCountedObject<RaftClientRequest>> streamEndOfRequestAsync( |
| ReferenceCountedObject<RaftClientRequest> requestRef) { |
| final RaftClientRequest request = requestRef.get(); |
| final MessageStreamRequestTypeProto stream = request.getType().getMessageStream(); |
| Preconditions.assertTrue(stream.getEndOfRequest()); |
| final ClientInvocationId key = ClientInvocationId.valueOf(request.getClientId(), stream.getStreamId()); |
| |
| final PendingStream pending = streams.remove(key); |
| if (pending == null) { |
| return JavaUtils.completeExceptionally(new StreamException(name + ": " + key + " not found")); |
| } |
| return pending.getWriteRequest(stream.getMessageId(), requestRef); |
| } |
| |
| void clear() { |
| streams.clear(); |
| } |
| } |