LogStream.java revision 13254:7cc5e8fd62c9
1/* 2 * Copyright (c) 2015, 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 24import java.io.ByteArrayOutputStream; 25import java.io.OutputStream; 26import java.io.PrintStream; 27 28import jdk.internal.logger.BootstrapLogger; 29 30/** 31 * We use an instance of this class to check what the logging system has printed 32 * on System.err. 33 */ 34class LogStream extends OutputStream { 35 36 static final PrintStream err = System.err; 37 38 private final ByteArrayOutputStream BAOS = new ByteArrayOutputStream(); 39 40 LogStream() { 41 super(); 42 } 43 44 @Override 45 public synchronized void write(int b) { 46 BAOS.write(b); 47 err.write(b); 48 } 49 50 String drain() { 51 BootstrapLoggerUtils.awaitPending(); 52 synchronized (this) { 53 String txt = BAOS.toString(); 54 BAOS.reset(); 55 return txt; 56 } 57 } 58} 59