src/java.management/share/classes/sun/management/counter/perf/PerfLongCounter.java
author darcy
Wed, 23 Oct 2019 13:01:40 -0700
changeset 58766 54ffb15c4839
parent 47216 71c04702a3d5
permissions -rw-r--r--
8232442: Suppress warnings on non-serializable non-transient instance fields in java.management.* Reviewed-by: rriggs, mchung
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/*
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 * Copyright (c) 2003, 2019, 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 sun.management.counter.perf;
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import sun.management.counter.*;
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import java.nio.LongBuffer;
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import java.nio.ReadOnlyBufferException;
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public class PerfLongCounter extends AbstractCounter
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       implements LongCounter {
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    @SuppressWarnings("serial") // Value indirectly copied as a long[] in writeReplace
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    LongBuffer lb;
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    // package private
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    PerfLongCounter(String name, Units u, Variability v, int flags,
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                    LongBuffer lb) {
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        super(name, u, v, flags);
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        this.lb = lb;
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    }
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    public Object getValue() {
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        return Long.valueOf(lb.get(0));
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    }
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    /**
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     * Get the value of this Long performance counter
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     */
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    public long longValue() {
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        return lb.get(0);
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    }
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    /**
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     * Serialize as a snapshot object.
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     */
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    protected Object writeReplace() throws java.io.ObjectStreamException {
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        return new LongCounterSnapshot(getName(),
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                                       getUnits(),
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                                       getVariability(),
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                                       getFlags(),
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                                       longValue());
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    }
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    private static final long serialVersionUID = 857711729279242948L;
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}