82 lines
2.5 KiB
Java
82 lines
2.5 KiB
Java
/*
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* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.management.jfr;
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import java.io.BufferedInputStream;
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import java.io.Closeable;
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import java.io.IOException;
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import java.io.InputStream;
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final class Stream implements Closeable {
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private final long identifier;
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private final BufferedInputStream inputStream;
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private final byte[] buffer;
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private volatile long time;
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Stream(InputStream is, long identifier, int blockSize) {
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this.inputStream = new BufferedInputStream(is, 50000);
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this.identifier = identifier;
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this.buffer = new byte[blockSize];
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}
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private void touch() {
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time = System.currentTimeMillis();
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}
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public long getLastTouched() {
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return time;
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}
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public byte[] read() throws IOException {
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// OK to reuse buffer since this
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// is only used for serialization
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touch();
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int read = inputStream.read(buffer);
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if (read == -1) {
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// null indicate no more data
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return null;
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}
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if (read != buffer.length) {
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byte[] smallerBuffer = new byte[read];
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System.arraycopy(buffer, 0, smallerBuffer, 0, read);
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return smallerBuffer;
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}
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return buffer;
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}
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@Override
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public void close() throws IOException {
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inputStream.close();
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}
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public long getId() {
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return identifier;
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}
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}
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