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/*
* Copyright 2015 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.consistent.impl;
import java.net.URI;
import java.nio.ByteBuffer;
import java.util.concurrent.CompletableFuture;
import org.onlab.util.Tools;
import org.onosproject.cluster.ClusterService;
import org.onosproject.cluster.ControllerNode;
import org.onosproject.cluster.NodeId;
import org.onosproject.store.cluster.messaging.ClusterCommunicationService;
import org.onosproject.store.cluster.messaging.MessageSubject;
import net.kuujo.copycat.protocol.AbstractProtocol;
import net.kuujo.copycat.protocol.ProtocolClient;
import net.kuujo.copycat.protocol.ProtocolHandler;
import net.kuujo.copycat.protocol.ProtocolServer;
import net.kuujo.copycat.util.Configurable;
/**
* Protocol for Copycat communication that employs
* {@code ClusterCommunicationService}.
*/
public class CopycatCommunicationProtocol extends AbstractProtocol {
private static final MessageSubject COPYCAT_MESSAGE_SUBJECT =
new MessageSubject("onos-copycat-message");
protected ClusterService clusterService;
protected ClusterCommunicationService clusterCommunicator;
public CopycatCommunicationProtocol(ClusterService clusterService,
ClusterCommunicationService clusterCommunicator) {
this.clusterService = clusterService;
this.clusterCommunicator = clusterCommunicator;
}
@Override
public Configurable copy() {
return this;
}
@Override
public ProtocolClient createClient(URI uri) {
NodeId nodeId = uriToNodeId(uri);
if (nodeId == null) {
throw new IllegalStateException("Unknown peer " + uri);
}
return new Client(nodeId);
}
@Override
public ProtocolServer createServer(URI uri) {
return new Server();
}
private class Server implements ProtocolServer {
@Override
public void handler(ProtocolHandler handler) {
if (handler == null) {
clusterCommunicator.removeSubscriber(COPYCAT_MESSAGE_SUBJECT);
} else {
clusterCommunicator.addSubscriber(COPYCAT_MESSAGE_SUBJECT,
ByteBuffer::wrap,
handler,
Tools::byteBuffertoArray);
// FIXME: Tools::byteBuffertoArray involves a array copy.
}
}
@Override
public CompletableFuture<Void> listen() {
return CompletableFuture.completedFuture(null);
}
@Override
public CompletableFuture<Void> close() {
clusterCommunicator.removeSubscriber(COPYCAT_MESSAGE_SUBJECT);
return CompletableFuture.completedFuture(null);
}
}
private class Client implements ProtocolClient {
private final NodeId peer;
public Client(NodeId peer) {
this.peer = peer;
}
@Override
public CompletableFuture<ByteBuffer> write(ByteBuffer request) {
return clusterCommunicator.sendAndReceive(request,
COPYCAT_MESSAGE_SUBJECT,
Tools::byteBuffertoArray,
ByteBuffer::wrap,
peer);
}
@Override
public CompletableFuture<Void> connect() {
return CompletableFuture.completedFuture(null);
}
@Override
public CompletableFuture<Void> close() {
return CompletableFuture.completedFuture(null);
}
}
private NodeId uriToNodeId(URI uri) {
return clusterService.getNodes()
.stream()
.filter(node -> uri.getHost().equals(node.ip().toString()))
.map(ControllerNode::id)
.findAny()
.orElse(null);
}
}
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