1 /* 2 * Copyright (c) 2016, 2020, 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.jfr.internal.consumer; 26 27 import java.io.BufferedInputStream; 28 import java.io.IOException; 29 import java.io.InputStream; 30 31 import jdk.jfr.internal.management.EventByteStream; 32 33 public final class FinishedStream extends EventByteStream { 34 private final BufferedInputStream inputStream; 35 private final byte[] buffer; 36 FinishedStream(InputStream is, int blockSize)37 public FinishedStream(InputStream is, int blockSize) { 38 super(); 39 this.inputStream = new BufferedInputStream(is, 50000); 40 this.buffer = new byte[blockSize]; 41 } 42 43 @Override read()44 public synchronized byte[] read() throws IOException { 45 // OK to reuse buffer since this 46 // is only used for serialization 47 touch(); 48 int read = inputStream.read(buffer); 49 if (read == -1) { 50 // null indicate no more data 51 return null; 52 } 53 if (read != buffer.length) { 54 byte[] smallerBuffer = new byte[read]; 55 System.arraycopy(buffer, 0, smallerBuffer, 0, read); 56 return smallerBuffer; 57 } 58 59 return buffer; 60 } 61 62 @Override close()63 public synchronized void close() throws IOException { 64 inputStream.close(); 65 } 66 67 } 68