lryan | 56e307f | 2014-12-05 13:25:08 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2014, Google Inc. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions are |
| 6 | * met: |
| 7 | * |
| 8 | * * Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * * Redistributions in binary form must reproduce the above |
| 11 | * copyright notice, this list of conditions and the following disclaimer |
| 12 | * in the documentation and/or other materials provided with the |
| 13 | * distribution. |
| 14 | * |
| 15 | * * Neither the name of Google Inc. nor the names of its |
| 16 | * contributors may be used to endorse or promote products derived from |
| 17 | * this software without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 20 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 21 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 22 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 23 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 24 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 25 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 26 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 27 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 29 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
zhangkun | 8d6d12e | 2014-10-15 13:04:19 -0700 | [diff] [blame] | 32 | package com.google.net.stubby; |
| 33 | |
| 34 | import com.google.common.base.Preconditions; |
| 35 | import com.google.common.util.concurrent.MoreExecutors; |
| 36 | import com.google.common.util.concurrent.Service; |
nathanmittler | 29cbef1 | 2014-10-27 11:33:19 -0700 | [diff] [blame] | 37 | import com.google.net.stubby.transport.ClientTransportFactory; |
zhangkun | 8d6d12e | 2014-10-15 13:04:19 -0700 | [diff] [blame] | 38 | |
| 39 | import java.util.concurrent.ExecutorService; |
| 40 | |
| 41 | import javax.annotation.Nullable; |
| 42 | |
| 43 | /** |
| 44 | * The base class for channel builders. |
nathanmittler | 0304b3d | 2014-10-24 13:39:13 -0700 | [diff] [blame] | 45 | * |
| 46 | * @param <BuilderT> The concrete type of this builder. |
zhangkun | 8d6d12e | 2014-10-15 13:04:19 -0700 | [diff] [blame] | 47 | */ |
ejona | ff669ac | 2014-11-07 10:28:47 -0800 | [diff] [blame] | 48 | public abstract class AbstractChannelBuilder<BuilderT extends AbstractChannelBuilder<BuilderT>> |
zhangkun | 8d6d12e | 2014-10-15 13:04:19 -0700 | [diff] [blame] | 49 | extends AbstractServiceBuilder<ChannelImpl, BuilderT> { |
| 50 | |
| 51 | @Override |
| 52 | protected final ChannelImpl buildImpl(ExecutorService executor) { |
| 53 | ChannelEssentials essentials = buildEssentials(); |
| 54 | ChannelImpl channel = new ChannelImpl(essentials.transportFactory, executor); |
| 55 | if (essentials.listener != null) { |
| 56 | channel.addListener(essentials.listener, MoreExecutors.directExecutor()); |
| 57 | } |
| 58 | return channel; |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * The essentials required for creating a channel. |
| 63 | */ |
| 64 | protected static class ChannelEssentials { |
| 65 | final ClientTransportFactory transportFactory; |
| 66 | @Nullable final Service.Listener listener; |
| 67 | |
| 68 | /** |
| 69 | * @param transportFactory the created channel uses this factory to create transports |
| 70 | * @param listener will be called at the channel's life-cycle events |
| 71 | */ |
| 72 | public ChannelEssentials(ClientTransportFactory transportFactory, |
| 73 | @Nullable Service.Listener listener) { |
| 74 | this.transportFactory = Preconditions.checkNotNull(transportFactory); |
| 75 | this.listener = listener; |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | protected abstract ChannelEssentials buildEssentials(); |
| 80 | } |