1 /* 2 * Copyright (c) 2016, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.io.*; 25 import java.nio.ByteBuffer; 26 27 import jdk.incubator.http.internal.frame.DataFrame; 28 29 /** 30 * OutputStream. Incoming window updates handled by the main connection 31 * reader thread. 32 */ 33 @SuppressWarnings({"rawtypes","unchecked"}) 34 class BodyOutputStream extends OutputStream { 35 final static byte[] EMPTY_BARRAY = new byte[0]; 36 37 final int streamid; 38 int window; 39 volatile boolean closed; 40 boolean goodToGo = false; // not allowed to send until headers sent 41 final Http2TestServerConnection conn; 42 final Queue outputQ; 43 44 BodyOutputStream(int streamid, int initialWindow, Http2TestServerConnection conn) { 45 this.window = initialWindow; 46 this.streamid = streamid; 47 this.conn = conn; 48 this.outputQ = conn.outputQ; 49 conn.registerStreamWindowUpdater(streamid, this::updateWindow); 50 } 51 52 // called from connection reader thread as all incoming window 53 // updates are handled there. 54 synchronized void updateWindow(int update) { 55 window += update; 56 notifyAll(); 57 } 58 59 void waitForWindow(int demand) throws InterruptedException { 60 // first wait for the connection window 61 conn.obtainConnectionWindow(demand); 62 // now wait for the stream window 63 synchronized (this) { 64 while (demand > 0) { 65 int n = Math.min(demand, window); 66 demand -= n; 67 window -= n; 68 if (demand > 0) { 69 wait(); 70 } 71 } 72 } 73 } 74 75 void goodToGo() { 76 goodToGo = true; 77 } 78 79 @Override 80 public void write(byte[] buf, int offset, int len) throws IOException { 81 if (closed) { 82 throw new IOException("closed"); 83 } 84 85 if (!goodToGo) { 86 throw new IllegalStateException("sendResponseHeaders must be called first"); 87 } 88 try { 89 waitForWindow(len); 90 send(buf, offset, len, 0); 91 } catch (InterruptedException ex) { 92 throw new IOException(ex); 93 } 94 } 95 96 private void send(byte[] buf, int offset, int len, int flags) throws IOException { 97 ByteBuffer buffer = ByteBuffer.allocate(len); 98 buffer.put(buf, offset, len); 99 buffer.flip(); 100 assert streamid != 0; 101 DataFrame df = new DataFrame(streamid, flags, buffer); 102 outputQ.put(df); 103 } 104 105 byte[] one = new byte[1]; 106 107 @Override 108 public void write(int b) throws IOException { 109 one[0] = (byte) b; 110 write(one, 0, 1); 111 } 112 113 void closeInternal() { 114 closed = true; 115 } 116 117 @Override 118 public void close() { 119 if (closed) return; 120 synchronized (this) { 121 if (closed) return; 122 closed = true; 123 } 124 try { 125 send(EMPTY_BARRAY, 0, 0, DataFrame.END_STREAM); 126 } catch (IOException ex) { 127 System.err.println("TestServer: OutputStream.close exception: " + ex); 128 ex.printStackTrace(); 129 } 130 } 131 }