protocol-framework: use lambdas
[controller.git] / opendaylight / commons / protocol-framework / src / main / java / org / opendaylight / protocol / framework / ReconnectPromise.java
1 /*
2  * Copyright (c) 2013 Cisco Systems, Inc. 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.protocol.framework;
9
10 import com.google.common.base.Preconditions;
11 import io.netty.bootstrap.Bootstrap;
12 import io.netty.channel.ChannelHandlerContext;
13 import io.netty.channel.ChannelInboundHandlerAdapter;
14 import io.netty.util.concurrent.DefaultPromise;
15 import io.netty.util.concurrent.EventExecutor;
16 import io.netty.util.concurrent.Future;
17 import io.netty.util.concurrent.GenericFutureListener;
18 import java.net.InetSocketAddress;
19 import org.slf4j.Logger;
20 import org.slf4j.LoggerFactory;
21
22 @Deprecated
23 final class ReconnectPromise<S extends ProtocolSession<?>, L extends SessionListener<?, ?, ?>> extends DefaultPromise<Void> {
24     private static final Logger LOG = LoggerFactory.getLogger(ReconnectPromise.class);
25
26     private final AbstractDispatcher<S, L> dispatcher;
27     private final InetSocketAddress address;
28     private final ReconnectStrategyFactory strategyFactory;
29     private final Bootstrap b;
30     private final AbstractDispatcher.PipelineInitializer<S> initializer;
31     private Future<?> pending;
32
33     public ReconnectPromise(final EventExecutor executor, final AbstractDispatcher<S, L> dispatcher, final InetSocketAddress address,
34                             final ReconnectStrategyFactory connectStrategyFactory, final Bootstrap b, final AbstractDispatcher.PipelineInitializer<S> initializer) {
35         super(executor);
36         this.b = b;
37         this.initializer = Preconditions.checkNotNull(initializer);
38         this.dispatcher = Preconditions.checkNotNull(dispatcher);
39         this.address = Preconditions.checkNotNull(address);
40         this.strategyFactory = Preconditions.checkNotNull(connectStrategyFactory);
41     }
42
43     synchronized void connect() {
44         final ReconnectStrategy cs = this.strategyFactory.createReconnectStrategy();
45
46         // Set up a client with pre-configured bootstrap, but add a closed channel handler into the pipeline to support reconnect attempts
47         pending = this.dispatcher.createClient(this.address, cs, b, (channel, promise) -> {
48             initializer.initializeChannel(channel, promise);
49             // add closed channel handler
50             // This handler has to be added as last channel handler and the channel inactive event has to be caught by it
51             // Handlers in front of it can react to channelInactive event, but have to forward the event or the reconnect will not work
52             // This handler is last so all handlers in front of it can handle channel inactive (to e.g. resource cleanup) before a new connection is started
53             channel.pipeline().addLast(new ClosedChannelHandler(ReconnectPromise.this));
54         });
55
56         pending.addListener((GenericFutureListener<Future<Object>>) future -> {
57             if (!future.isSuccess()) {
58                 ReconnectPromise.this.setFailure(future.cause());
59             }
60         });
61     }
62
63     /**
64      *
65      * @return true if initial connection was established successfully, false if initial connection failed due to e.g. Connection refused, Negotiation failed
66      */
67     private boolean isInitialConnectFinished() {
68         Preconditions.checkNotNull(pending);
69         return pending.isDone() && pending.isSuccess();
70     }
71
72     @Override
73     public synchronized boolean cancel(final boolean mayInterruptIfRunning) {
74         if (super.cancel(mayInterruptIfRunning)) {
75             Preconditions.checkNotNull(pending);
76             this.pending.cancel(mayInterruptIfRunning);
77             return true;
78         }
79
80         return false;
81     }
82
83     /**
84      * Channel handler that responds to channelInactive event and reconnects the session.
85      * Only if the promise was not canceled.
86      */
87     private static final class ClosedChannelHandler extends ChannelInboundHandlerAdapter {
88         private final ReconnectPromise<?, ?> promise;
89
90         public ClosedChannelHandler(final ReconnectPromise<?, ?> promise) {
91             this.promise = promise;
92         }
93
94         @Override
95         public void channelInactive(final ChannelHandlerContext ctx) throws Exception {
96             // This is the ultimate channel inactive handler, not forwarding
97             if (promise.isCancelled()) {
98                 return;
99             }
100
101             if (promise.isInitialConnectFinished() == false) {
102                 LOG.debug("Connection to {} was dropped during negotiation, reattempting", promise.address);
103             }
104
105             LOG.debug("Reconnecting after connection to {} was dropped", promise.address);
106             promise.connect();
107         }
108     }
109
110 }

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