1 /*
   2  * Copyright (c) 2015, 2016, 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 java.net.http;
  27 
  28 import java.io.IOException;
  29 import java.nio.ByteBuffer;
  30 import java.nio.channels.ByteChannel;
  31 import java.nio.channels.GatheringByteChannel;
  32 import java.nio.channels.SelectableChannel;
  33 import java.nio.channels.SelectionKey;
  34 import java.nio.channels.SocketChannel;
  35 
  36 //
  37 // Used to implement WebSocket. Each RawChannel corresponds to a TCP connection
  38 // (SocketChannel) but is connected to a Selector and an ExecutorService for
  39 // invoking the send and receive callbacks. Also includes SSL processing.
  40 //
  41 final class RawChannel implements ByteChannel, GatheringByteChannel {
  42 
  43     private final HttpClientImpl client;
  44     private final HttpConnection connection;
  45 
  46     private interface RawEvent {
  47 
  48         /**
  49          * must return the selector interest op flags OR'd.
  50          */
  51         int interestOps();
  52 
  53         /**
  54          * called when event occurs.
  55          */
  56         void handle();
  57     }
  58 
  59     interface NonBlockingEvent extends RawEvent {
  60     }
  61 
  62     RawChannel(HttpClientImpl client, HttpConnection connection)
  63                                                 throws IOException {
  64         this.client = client;
  65         this.connection = connection;
  66         SocketChannel chan = connection.channel();
  67         client.cancelRegistration(chan);
  68         chan.configureBlocking(false);
  69     }
  70 
  71     SocketChannel socketChannel() {
  72         return connection.channel();
  73     }
  74 
  75     ByteBuffer getRemaining() {
  76         return connection.getRemaining();
  77     }
  78 
  79     private class RawAsyncEvent extends AsyncEvent {
  80 
  81         private final RawEvent re;
  82 
  83         RawAsyncEvent(RawEvent re) {
  84             super(AsyncEvent.BLOCKING); // BLOCKING & !REPEATING
  85             this.re = re;
  86         }
  87 
  88         RawAsyncEvent(RawEvent re, int flags) {
  89             super(flags);
  90             this.re = re;
  91         }
  92 
  93         @Override
  94         public SelectableChannel channel() {
  95             return connection.channel();
  96         }
  97 
  98         // must return the selector interest op flags OR'd
  99         @Override
 100         public int interestOps() {
 101             return re.interestOps();
 102         }
 103 
 104         // called when event occurs
 105         @Override
 106         public void handle() {
 107             re.handle();
 108         }
 109 
 110         @Override
 111         public void abort() { }
 112     }
 113 
 114     private class NonBlockingRawAsyncEvent extends RawAsyncEvent {
 115 
 116         NonBlockingRawAsyncEvent(RawEvent re) {
 117             super(re, 0); // !BLOCKING & !REPEATING
 118         }
 119     }
 120 
 121     /*
 122      * Register given event whose callback will be called once only.
 123      * (i.e. register new event for each callback)
 124      */
 125     public void registerEvent(RawEvent event) throws IOException {
 126         if (!(event instanceof NonBlockingEvent)) {
 127             throw new InternalError();
 128         }
 129         if ((event.interestOps() & SelectionKey.OP_READ) != 0
 130                 && connection.buffer.hasRemaining()) {
 131             // FIXME: a hack to deal with leftovers from previous reads into an
 132             // internal buffer (works in conjunction with change in
 133             // java.net.http.PlainHttpConnection.readImpl(java.nio.ByteBuffer)
 134             connection.channel().configureBlocking(false);
 135             event.handle();
 136         } else {
 137             client.registerEvent(new NonBlockingRawAsyncEvent(event));
 138         }
 139     }
 140 
 141     @Override
 142     public int read(ByteBuffer dst) throws IOException {
 143         assert !connection.channel().isBlocking();
 144         return connection.read(dst);
 145     }
 146 
 147     @Override
 148     public boolean isOpen() {
 149         return connection.isOpen();
 150     }
 151 
 152     @Override
 153     public void close() throws IOException {
 154         connection.close();
 155     }
 156 
 157     @Override
 158     public long write(ByteBuffer[] src) throws IOException {
 159         return connection.write(src, 0, src.length);
 160     }
 161 
 162     @Override
 163     public long write(ByteBuffer[] src, int offset, int len)
 164             throws IOException {
 165         return connection.write(src, offset, len);
 166     }
 167 
 168     @Override
 169     public int write(ByteBuffer src) throws IOException {
 170         return (int) connection.write(src);
 171     }
 172 }