1 /* 2 * Copyright (c) 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. 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.common.ByteBufferReference; 28 import jdk.incubator.http.internal.common.Queue; 29 import jdk.incubator.http.internal.frame.DataFrame; 30 31 /** 32 * OutputStream. Incoming window updates handled by the main connection 33 * reader thread. 34 */ 35 @SuppressWarnings({"rawtypes","unchecked"}) 36 class BodyOutputStream extends OutputStream { 37 final static byte[] EMPTY_BARRAY = new byte[0]; 38 39 final int streamid; 40 int window; 41 boolean closed; 42 boolean goodToGo = false; // not allowed to send until headers sent 43 final Http2TestServerConnection conn; 44 final Queue outputQ; 45 46 BodyOutputStream(int streamid, int initialWindow, Http2TestServerConnection conn) { 47 this.window = initialWindow; 48 this.streamid = streamid; 49 this.conn = conn; 50 this.outputQ = conn.outputQ; 51 conn.registerStreamWindowUpdater(streamid, this::updateWindow); 52 } 53 54 // called from connection reader thread as all incoming window 55 // updates are handled there. 56 synchronized void updateWindow(int update) { 57 window += update; 58 notifyAll(); 59 } 60 61 void waitForWindow(int demand) throws InterruptedException { 62 // first wait for the connection window 63 conn.obtainConnectionWindow(demand); 64 // now wait for the stream window 65 synchronized (this) { 66 while (demand > 0) { 67 int n = Math.min(demand, window); 68 demand -= n; 69 window -= n; 70 if (demand > 0) { 71 wait(); 72 } 73 } 74 } 75 } 76 77 void goodToGo() { 78 goodToGo = true; 79 } 80 81 @Override 82 public void write(byte[] buf, int offset, int len) throws IOException { 83 if (closed) { 84 throw new IOException("closed"); 85 } 86 87 if (!goodToGo) { 88 throw new IllegalStateException("sendResponseHeaders must be called first"); 89 } 90 try { 91 waitForWindow(len); 92 send(buf, offset, len, 0); 93 } catch (InterruptedException ex) { 94 throw new IOException(ex); 95 } 96 } 97 98 private void send(byte[] buf, int offset, int len, int flags) throws IOException { 99 ByteBuffer buffer = ByteBuffer.allocate(len); 100 buffer.put(buf, offset, len); 101 buffer.flip(); 102 assert streamid != 0; 103 DataFrame df = new DataFrame(streamid, flags, ByteBufferReference.of(buffer)); 104 outputQ.put(df); 105 } 106 107 byte[] one = new byte[1]; 108 109 @Override 110 public void write(int b) throws IOException { 111 one[0] = (byte) b; 112 write(one, 0, 1); 113 } 114 115 void closeInternal() { 116 closed = true; 117 } 118 119 @Override 120 public void close() { 121 if (closed) { 122 return; 123 } 124 closed = true; 125 try { 126 send(EMPTY_BARRAY, 0, 0, DataFrame.END_STREAM); 127 } catch (IOException ex) { 128 System.err.println("TestServer: OutputStream.close exception: " + ex); 129 ex.printStackTrace(); 130 } 131 } 132 }