80 lines
2.4 KiB
Java
80 lines
2.4 KiB
Java
/*
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* Copyright (c) 2013, 2022, 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.
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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 gc.testlibrary;
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import sun.jvmstat.monitor.Monitor;
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/**
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* Represents a performance counter in the JVM.
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*
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* See https://openjdk.org/groups/hotspot/docs/Serviceability.html#bjvmstat
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* for more details about performance counters.
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*/
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public class PerfCounter {
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private final Monitor monitor;
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private final String name;
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PerfCounter(Monitor monitor, String name) {
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this.monitor = monitor;
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this.name = name;
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}
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/**
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* Returns the value of this performance counter as an Object.
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*
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* @return The value of this performance counter
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*/
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public Object value() {
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return monitor.getValue();
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}
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/**
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* Returns the value of this performance counter as a long.
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*
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* @return The long value of this performance counter
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* @throws RuntimeException If the value of the performance counter isn't a long
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*/
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public long longValue() {
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Object value = monitor.getValue();
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if (value instanceof Long) {
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return ((Long) value).longValue();
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}
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throw new RuntimeException("Expected " + monitor.getName() + " to have a long value");
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}
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/**
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* Returns the name of the performance counter.
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*
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* @return The name of the performance counter.
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*/
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public String getName() {
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return name;
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}
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@Override
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public String toString() {
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return name;
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}
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}
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