replicate/mdsal-replicate-netty/src/main/java/org/opendaylight/mdsal/replicate/netty/SourceSingletonService.java

   1 /*
   2  * Copyright (c) 2020 PANTHEON.tech, s.r.o. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.mdsal.replicate.netty;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import com.google.common.util.concurrent.Futures;
  13 import com.google.common.util.concurrent.ListenableFuture;
  14 import com.google.common.util.concurrent.MoreExecutors;
  15 import com.google.common.util.concurrent.SettableFuture;
  16 import io.netty.channel.Channel;
  17 import io.netty.channel.ChannelFuture;
  18 import io.netty.channel.ChannelInitializer;
  19 import io.netty.channel.ChannelOption;
  20 import io.netty.channel.socket.SocketChannel;
  21 import java.util.ArrayList;
  22 import java.util.Collection;
  23 import java.util.HashSet;
  24 import java.util.List;
  25 import org.checkerframework.checker.lock.qual.GuardedBy;
  26 import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeService;
  27 import org.opendaylight.mdsal.singleton.common.api.ClusterSingletonService;
  28 import org.opendaylight.mdsal.singleton.common.api.ServiceGroupIdentifier;
  29 import org.opendaylight.yangtools.yang.data.codec.binfmt.NormalizedNodeStreamVersion;
  30 import org.slf4j.Logger;
  31 import org.slf4j.LoggerFactory;
  32
  33 /**
  34  * Cluster Singleton Service handler for delta stream source. Responsible for starting/stopping the delta stream source
  35  * for a particular port.
  36  */
  37 final class SourceSingletonService extends ChannelInitializer<SocketChannel> implements ClusterSingletonService {
  38     private static final Logger LOG = LoggerFactory.getLogger(SourceSingletonService.class);
  39     private static final ServiceGroupIdentifier SGID =
  40             ServiceGroupIdentifier.create(SourceSingletonService.class.getName());
  41
  42     private final BootstrapSupport bootstrapSupport;
  43     private final DOMDataTreeChangeService dtcs;
  44     private final int listenPort;
  45
  46     @GuardedBy("this")
  47     private final Collection<SocketChannel> children = new HashSet<>();
  48     @GuardedBy("this")
  49     private Channel serverChannel;
  50
  51     SourceSingletonService(final BootstrapSupport bootstrapSupport, final DOMDataTreeChangeService dtcs,
  52             final int listenPort) {
  53         this.bootstrapSupport = requireNonNull(bootstrapSupport);
  54         this.dtcs = requireNonNull(dtcs);
  55         this.listenPort = listenPort;
  56     }
  57
  58     @Override
  59     public ServiceGroupIdentifier getIdentifier() {
  60         return SGID;
  61     }
  62
  63     @Override
  64     public synchronized void instantiateServiceInstance() {
  65         final ChannelFuture future = bootstrapSupport.newServerBootstrap()
  66                 .option(ChannelOption.SO_BACKLOG, 3)
  67                 .childOption(ChannelOption.SO_KEEPALIVE, true)
  68                 .childHandler(this)
  69                 .bind(listenPort);
  70
  71         try {
  72             future.sync();
  73         } catch (InterruptedException e) {
  74             throw new IllegalStateException("Failed to bind port " + listenPort, e);
  75         }
  76
  77         serverChannel = future.channel();
  78         LOG.info("Replication source started on port {}", listenPort);
  79     }
  80
  81     @Override
  82     public synchronized ListenableFuture<?> closeServiceInstance() {
  83         LOG.info("Replication source on port {} shutting down", listenPort);
  84
  85         final List<ListenableFuture<Void>> futures = new ArrayList<>();
  86
  87         // Close server channel
  88         futures.add(closeChannel(serverChannel));
  89         serverChannel = null;
  90
  91         // Close all child channels
  92         for (SocketChannel channel : children) {
  93             futures.add(closeChannel(channel));
  94         }
  95         children.clear();
  96
  97         final ListenableFuture<?> ret = Futures.nonCancellationPropagating(Futures.successfulAsList(futures));
  98         ret.addListener(() -> {
  99             LOG.info("Replication source on port {} shut down", listenPort);
 100         }, MoreExecutors.directExecutor());
 101         return ret;
 102     }
 103
 104     @Override
 105     public synchronized void initChannel(final SocketChannel ch) {
 106         if (serverChannel == null) {
 107             LOG.debug("Channel {} established while shutting down, closing it", ch);
 108             ch.close();
 109             return;
 110         }
 111
 112         ch.pipeline()
 113             .addLast("frameDecoder", new MessageFrameDecoder())
 114             .addLast("requestHandler", new SourceRequestHandler(dtcs))
 115             .addLast("dtclHandler", new DeltaEncoder(NormalizedNodeStreamVersion.current()))
 116             .addLast("frameEncoder", MessageFrameEncoder.instance());
 117         children.add(ch);
 118
 119         LOG.debug("Channel {} established", ch);
 120     }
 121
 122     private static ListenableFuture<Void> closeChannel(final Channel ch) {
 123         final SettableFuture<Void> ret = SettableFuture.create();
 124         ch.closeFuture().addListener(chf -> {
 125             final Throwable cause = chf.cause();
 126             if (cause != null) {
 127                 ret.setException(cause);
 128             } else {
 129                 ret.set(null);
 130             }
 131         });
 132
 133         ch.close();
 134         return ret;
 135     }
 136 }