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/*
* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.lang.management.ManagementFactory;
import java.util.List;
import javax.management.MBeanServer;
import javax.management.ObjectName;
public class LoggingTest {
static class TestStream extends PrintStream {
final ByteArrayOutputStream bos = new ByteArrayOutputStream();
private volatile boolean recording;
public TestStream(PrintStream wrapped) {
super(wrapped);
}
void startRecording() {
recording = true;
}
void stopRecording() {
recording = false;
}
@Override
public void write(int b) {
if (recording) {
bos.write(b);
}
super.write(b);
}
@Override
public void write(byte[] buf, int off, int len) {
if (recording) {
bos.write(buf, off, len);
}
super.write(buf, off, len);
}
@Override
public void write(byte[] buf) throws IOException {
if (recording) {
bos.write(buf);
}
super.write(buf);
}
}
public void run(TestStream ts) {
// start recording traces and trigger creation of the platform
// MBeanServer to produce some. This won't work if the platform
// MBeanServer was already initialized - so it's important to
// run this test in its own JVM.
ts.startRecording();
MBeanServer platform = ManagementFactory.getPlatformMBeanServer();
ts.stopRecording();
String printed = ts.bos.toString();
ts.bos.reset();
// Check that the Platform MBeanServer is emitting the expected
// log traces. This can be a bit fragile because debug traces
// could be changed without notice - in which case this test will
// need to be updated.
// For each registered MBean we expect to see three traces.
// If the messages logged by the MBeanServer change then these checks
// may need to be revisited.
List<String> checkTraces =
List.of("ObjectName = %s", "name = %s", "JMX.mbean.registered %s");
for (ObjectName o : platform.queryNames(ObjectName.WILDCARD, null)) {
String n = o.toString();
System.out.println("Checking log for: " + n);
for (String check : checkTraces) {
String s = String.format(check, n);
if (!printed.contains(s)) {
throw new RuntimeException("Trace not found: " + s);
}
}
}
}
}
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