| /* |
| * Copyright 2016-present Open Networking Laboratory |
| * |
| * Licensed 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.onosproject.store.primitives.impl; |
| |
| import com.google.common.collect.Sets; |
| import io.atomix.catalyst.concurrent.ThreadContext; |
| import io.atomix.catalyst.transport.Address; |
| import io.atomix.catalyst.transport.Connection; |
| import io.atomix.catalyst.transport.Server; |
| import org.apache.commons.lang3.RandomUtils; |
| import org.onosproject.cluster.PartitionId; |
| import org.onosproject.store.cluster.messaging.MessagingService; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Set; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.function.Consumer; |
| |
| import static com.google.common.base.MoreObjects.toStringHelper; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static org.onosproject.store.primitives.impl.CopycatTransport.CONNECT; |
| import static org.onosproject.store.primitives.impl.CopycatTransport.FAILURE; |
| import static org.onosproject.store.primitives.impl.CopycatTransport.SUCCESS; |
| |
| /** |
| * Copycat transport server implementation. |
| */ |
| public class CopycatTransportServer implements Server { |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| private final PartitionId partitionId; |
| private final String serverSubject; |
| private final MessagingService messagingService; |
| private final Set<CopycatTransportConnection> connections = Sets.newConcurrentHashSet(); |
| |
| public CopycatTransportServer(PartitionId partitionId, MessagingService messagingService) { |
| this.partitionId = checkNotNull(partitionId, "partitionId cannot be null"); |
| this.serverSubject = String.format("onos-copycat-%s", partitionId); |
| this.messagingService = checkNotNull(messagingService, "messagingService cannot be null"); |
| } |
| |
| @Override |
| public CompletableFuture<Void> listen(Address address, Consumer<Connection> consumer) { |
| ThreadContext context = ThreadContext.currentContextOrThrow(); |
| messagingService.registerHandler(serverSubject, (sender, payload) -> { |
| |
| // Only connect messages can be sent to the server. Once a connect message |
| // is received, the connection will register a separate handler for messaging. |
| ByteBuffer requestBuffer = ByteBuffer.wrap(payload); |
| if (requestBuffer.get() != CONNECT) { |
| ByteBuffer responseBuffer = ByteBuffer.allocate(1); |
| responseBuffer.put(FAILURE); |
| return CompletableFuture.completedFuture(responseBuffer.array()); |
| } |
| |
| // Create the connection and ensure state is cleaned up when the connection is closed. |
| long connectionId = RandomUtils.nextLong(); |
| CopycatTransportConnection connection = new CopycatTransportConnection( |
| connectionId, |
| CopycatTransportConnection.Mode.SERVER, |
| partitionId, |
| sender, |
| messagingService, |
| context); |
| connection.onClose(connections::remove); |
| connections.add(connection); |
| |
| CompletableFuture<byte[]> future = new CompletableFuture<>(); |
| |
| // We need to ensure the connection event is called on the Copycat thread |
| // and that the future is not completed until the Copycat server has been |
| // able to register message handlers, otherwise some messages can be received |
| // prior to any handlers being registered. |
| context.executor().execute(() -> { |
| log.debug("Created connection {}-{}", partitionId, connectionId); |
| consumer.accept(connection); |
| |
| ByteBuffer responseBuffer = ByteBuffer.allocate(9); |
| responseBuffer.put(SUCCESS); |
| responseBuffer.putLong(connectionId); |
| future.complete(responseBuffer.array()); |
| }); |
| return future; |
| }); |
| return CompletableFuture.completedFuture(null); |
| } |
| |
| @Override |
| public CompletableFuture<Void> close() { |
| return CompletableFuture.allOf(connections.stream().map(Connection::close).toArray(CompletableFuture[]::new)); |
| } |
| |
| @Override |
| public String toString() { |
| return toStringHelper(this) |
| .add("partitionId", partitionId) |
| .toString(); |
| } |
| } |