tom | 1d416c5 | 2014-09-29 20:55:24 -0700 | [diff] [blame] | 1 | package org.onlab.onos.store.cluster.impl; |
| 2 | |
| 3 | import org.onlab.nio.IOLoop; |
| 4 | import org.onlab.nio.MessageStream; |
| 5 | import org.onlab.onos.cluster.DefaultControllerNode; |
| 6 | import org.onlab.onos.store.cluster.messaging.ClusterMessage; |
| 7 | import org.onlab.onos.store.cluster.messaging.ClusterMessageStream; |
| 8 | import org.onlab.onos.store.cluster.messaging.SerializationService; |
| 9 | import org.slf4j.Logger; |
| 10 | import org.slf4j.LoggerFactory; |
| 11 | |
| 12 | import java.io.IOException; |
| 13 | import java.net.InetSocketAddress; |
| 14 | import java.nio.channels.ByteChannel; |
| 15 | import java.nio.channels.SelectionKey; |
| 16 | import java.nio.channels.SocketChannel; |
| 17 | import java.util.List; |
| 18 | import java.util.Objects; |
| 19 | |
| 20 | import static org.onlab.packet.IpPrefix.valueOf; |
| 21 | |
| 22 | /** |
| 23 | * Performs the IO operations related to a cluster-wide communications. |
| 24 | */ |
| 25 | public class ClusterIOWorker extends |
| 26 | IOLoop<ClusterMessage, ClusterMessageStream> { |
| 27 | |
| 28 | private final Logger log = LoggerFactory.getLogger(getClass()); |
| 29 | |
| 30 | private static final long SELECT_TIMEOUT = 50; |
| 31 | |
| 32 | private final ConnectionManager connectionManager; |
| 33 | private final CommunicationsDelegate commsDelegate; |
| 34 | private final SerializationService serializationService; |
| 35 | private final ClusterMessage helloMessage; |
| 36 | |
| 37 | /** |
| 38 | * Creates a new cluster IO worker. |
| 39 | * |
| 40 | * @param connectionManager parent connection manager |
| 41 | * @param commsDelegate communications delegate for dispatching |
| 42 | * @param serializationService serialization service for encode/decode |
| 43 | * @param helloMessage hello message for greeting peers |
| 44 | * @throws IOException if errors occur during IO loop ignition |
| 45 | */ |
| 46 | ClusterIOWorker(ConnectionManager connectionManager, |
| 47 | CommunicationsDelegate commsDelegate, |
| 48 | SerializationService serializationService, |
| 49 | ClusterMessage helloMessage) throws IOException { |
| 50 | super(SELECT_TIMEOUT); |
| 51 | this.connectionManager = connectionManager; |
| 52 | this.commsDelegate = commsDelegate; |
| 53 | this.serializationService = serializationService; |
| 54 | this.helloMessage = helloMessage; |
| 55 | } |
| 56 | |
| 57 | @Override |
| 58 | protected ClusterMessageStream createStream(ByteChannel byteChannel) { |
| 59 | return new ClusterMessageStream(serializationService, this, byteChannel); |
| 60 | } |
| 61 | |
| 62 | @Override |
| 63 | protected void processMessages(List<ClusterMessage> messages, MessageStream<ClusterMessage> stream) { |
| 64 | for (ClusterMessage message : messages) { |
| 65 | commsDelegate.dispatch(message); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | @Override |
| 70 | public ClusterMessageStream acceptStream(SocketChannel channel) { |
| 71 | ClusterMessageStream stream = super.acceptStream(channel); |
| 72 | try { |
| 73 | InetSocketAddress sa = (InetSocketAddress) channel.getRemoteAddress(); |
| 74 | log.info("Accepted connection from node {}", valueOf(sa.getAddress().getAddress())); |
| 75 | stream.write(helloMessage); |
| 76 | |
| 77 | } catch (IOException e) { |
| 78 | log.warn("Unable to accept connection from an unknown end-point", e); |
| 79 | } |
| 80 | return stream; |
| 81 | } |
| 82 | |
| 83 | @Override |
| 84 | protected void connect(SelectionKey key) throws IOException { |
| 85 | try { |
| 86 | super.connect(key); |
| 87 | ClusterMessageStream stream = (ClusterMessageStream) key.attachment(); |
| 88 | stream.write(helloMessage); |
| 89 | |
| 90 | } catch (IOException e) { |
| 91 | if (!Objects.equals(e.getMessage(), "Connection refused")) { |
| 92 | throw e; |
| 93 | } |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | @Override |
| 98 | protected void removeStream(MessageStream<ClusterMessage> stream) { |
| 99 | DefaultControllerNode node = ((ClusterMessageStream) stream).node(); |
| 100 | if (node != null) { |
| 101 | log.info("Closed connection to node {}", node.id()); |
| 102 | connectionManager.removeNodeStream(node); |
| 103 | } |
| 104 | super.removeStream(stream); |
| 105 | } |
| 106 | |
| 107 | } |