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. 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 package jdk.jshell.execution; 26 27 import java.io.DataInputStream; 28 import java.io.IOException; 29 import java.io.InputStream; 30 import java.io.OutputStream; 31 import java.util.Map; 32 33 /** 34 * Read from an InputStream which has been packetized and write its contents 35 * to the named OutputStreams. 36 * 37 * @author Jan Lahoda 38 * @see Util#demultiplexInput(java.io.InputStream, java.io.OutputStream, java.io.OutputStream, java.io.OutputStream...) 39 */ 40 class DemultiplexInput extends Thread { 41 42 private final DataInputStream delegate; 43 private final PipeInputStream command; 44 private final Map<String, OutputStream> io; 45 46 DemultiplexInput(InputStream input, PipeInputStream command, 47 Map<String, OutputStream> io) { 48 super("output reader"); 49 this.delegate = new DataInputStream(input); 50 this.command = command; 51 this.io = io; 52 } 53 54 @Override 55 public void run() { 56 try { 57 while (true) { 58 int nameLen = delegate.read(); 59 if (nameLen == (-1)) { 60 break; 61 } 62 byte[] name = new byte[nameLen]; 63 DemultiplexInput.this.delegate.readFully(name); 64 int dataLen = delegate.read(); 65 byte[] data = new byte[dataLen]; 66 DemultiplexInput.this.delegate.readFully(data); 67 String chan = new String(name, "UTF-8"); 68 if (chan.equals("command")) { 69 for (byte b : data) { 70 command.write(Byte.toUnsignedInt(b)); 71 } 72 } else { 73 OutputStream out = io.get(chan); 74 if (out == null) { 75 debug("Unexpected channel name: %s", chan); 76 } else { 77 out.write(data); 78 } 79 } 80 } 81 } catch (IOException ex) { 82 debug(ex, "Failed reading output"); 83 } finally { 84 command.close(); 85 } 86 } 87 88 /** 89 * Log debugging information. Arguments as for {@code printf}. 90 * 91 * @param format a format string as described in Format string syntax 92 * @param args arguments referenced by the format specifiers in the format 93 * string. 94 */ 95 private void debug(String format, Object... args) { 96 // Reserved for future logging 97 } 98 99 /** 100 * Log a serious unexpected internal exception. 101 * 102 * @param ex the exception 103 * @param where a description of the context of the exception 104 */ 105 private void debug(Throwable ex, String where) { 106 // Reserved for future logging 107 } 108 109 }