1 /*
   2  * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.incubator.http;
  27 
  28 import jdk.incubator.http.internal.common.Utils;
  29 import jdk.incubator.http.internal.websocket.RawChannel;
  30 
  31 import java.io.IOException;
  32 import java.nio.ByteBuffer;
  33 import java.nio.channels.SelectableChannel;
  34 import java.nio.channels.SocketChannel;
  35 import java.util.function.Supplier;
  36 
  37 /*
  38  * Each RawChannel corresponds to a TCP connection (SocketChannel) but is
  39  * connected to a Selector and an ExecutorService for invoking the send and
  40  * receive callbacks. Also includes SSL processing.
  41  */
  42 final class RawChannelImpl implements RawChannel {
  43 
  44     private final HttpClientImpl client;
  45     private final HttpConnection.DetachedConnectionChannel detachedChannel;
  46     private final Object         initialLock = new Object();
  47     private Supplier<ByteBuffer> initial;
  48 
  49     RawChannelImpl(HttpClientImpl client,
  50                    HttpConnection connection,
  51                    Supplier<ByteBuffer> initial)
  52             throws IOException
  53     {
  54         this.client = client;
  55         this.detachedChannel = connection.detachChannel();
  56         this.initial = initial;
  57 
  58         SocketChannel chan = connection.channel();
  59         client.cancelRegistration(chan);
  60         // Constructing a RawChannel is supposed to have a "hand over"
  61         // semantics, in other words if construction fails, the channel won't be
  62         // needed by anyone, in which case someone still needs to close it
  63         try {
  64             chan.configureBlocking(false);
  65         } catch (IOException e) {
  66             try {
  67                 chan.close();
  68             } catch (IOException e1) {
  69                 e.addSuppressed(e1);
  70             } finally {
  71                 detachedChannel.close();
  72             }
  73             throw e;
  74         }
  75     }
  76 
  77     private class NonBlockingRawAsyncEvent extends AsyncEvent {
  78 
  79         private final RawEvent re;
  80 
  81         NonBlockingRawAsyncEvent(RawEvent re) {
  82             // !BLOCKING & !REPEATING
  83             this.re = re;
  84         }
  85 
  86         @Override
  87         public SelectableChannel channel() {
  88             return detachedChannel.channel();
  89         }
  90 
  91         @Override
  92         public int interestOps() {
  93             return re.interestOps();
  94         }
  95 
  96         @Override
  97         public void handle() {
  98             re.handle();
  99         }
 100 
 101         @Override
 102         public void abort(IOException ioe) { }
 103     }
 104 
 105     @Override
 106     public void registerEvent(RawEvent event) throws IOException {
 107         client.registerEvent(new NonBlockingRawAsyncEvent(event));
 108     }
 109 
 110     @Override
 111     public ByteBuffer read() throws IOException {
 112         assert !detachedChannel.channel().isBlocking();
 113         // connection.read() will no longer be available.
 114         return detachedChannel.read();
 115     }
 116 
 117     @Override
 118     public ByteBuffer initialByteBuffer() {
 119         synchronized (initialLock) {
 120             if (initial == null) {
 121                 throw new IllegalStateException();
 122             }
 123             ByteBuffer ref = initial.get();
 124             ref = ref.hasRemaining() ? Utils.copy(ref)
 125                     : Utils.EMPTY_BYTEBUFFER;
 126             initial = null;
 127             return ref;
 128         }
 129     }
 130 
 131     @Override
 132     public long write(ByteBuffer[] src, int offset, int len) throws IOException {
 133         // this makes the whitebox driver test fail.
 134         return detachedChannel.write(src, offset, len);
 135     }
 136 
 137     @Override
 138     public void shutdownInput() throws IOException {
 139         detachedChannel.shutdownInput();
 140     }
 141 
 142     @Override
 143     public void shutdownOutput() throws IOException {
 144         detachedChannel.shutdownOutput();
 145     }
 146 
 147     @Override
 148     public void close() throws IOException {
 149         detachedChannel.close();
 150     }
 151 
 152     @Override
 153     public String toString() {
 154         return super.toString()+"("+ detachedChannel.toString() + ")";
 155     }
 156 
 157 
 158 }