jdk/src/java.management/share/classes/sun/management/ConnectorAddressLink.java
author jbachorik
Fri, 03 Apr 2015 15:39:38 +0200
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8075926: Add a sun.management.JMXConnectorServer perf counter to track its state Reviewed-by: duke
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/*
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 * Copyright (c) 2004, 2015, 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;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.atomic.AtomicInteger;
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import sun.misc.Perf;
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import sun.management.counter.Units;
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import sun.management.counter.Counter;
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import sun.management.counter.perf.PerfInstrumentation;
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/**
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 * A utility class to support the exporting and importing of the address
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 * of a connector server using the instrumentation buffer.
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 *
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 * @since 1.5
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 */
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public class ConnectorAddressLink {
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    /**
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     * A simple wrapper for the perf-counter backing {@linkplain ByteBuffer}
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     */
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    private static final class PerfHandle {
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        private ByteBuffer bb;
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        private PerfHandle(ByteBuffer bb) {
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            this.bb = bb.order(ByteOrder.nativeOrder());
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        }
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        private void putLong(long l) {
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            this.bb = bb.clear();
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            this.bb.asLongBuffer().put(l);
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        }
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    }
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    private static final String CONNECTOR_ADDRESS_COUNTER =
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            "sun.management.JMXConnectorServer.address";
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    private static final String REMOTE_CONNECTOR_STATE_COUNTER =
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            "sun.management.JMXConnectorServer.remote.enabled";
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    /*
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     * The format of the jvmstat counters representing the properties of
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     * a given out-of-the-box JMX remote connector will be as follows:
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     *
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     * sun.management.JMXConnectorServer.<counter>.<key>=<value>
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     *
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     * where:
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     *
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     *     counter = index computed by this class which uniquely identifies
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     *               an out-of-the-box JMX remote connector running in this
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     *               Java virtual machine.
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     *     key/value = a given key/value pair in the map supplied to the
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     *                 exportRemote() method.
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     *
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     * For example,
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     *
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     * sun.management.JMXConnectorServer.0.remoteAddress=service:jmx:rmi:///jndi/rmi://myhost:5000/jmxrmi
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     * sun.management.JMXConnectorServer.0.authenticate=false
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     * sun.management.JMXConnectorServer.0.ssl=false
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     * sun.management.JMXConnectorServer.0.sslRegistry=false
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     * sun.management.JMXConnectorServer.0.sslNeedClientAuth=false
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     */
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    private static final String REMOTE_CONNECTOR_COUNTER_PREFIX =
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            "sun.management.JMXConnectorServer.";
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    /*
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     * JMX remote connector counter (it will be incremented every
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     * time a new out-of-the-box JMX remote connector is created).
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     */
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    private static final AtomicInteger counter = new AtomicInteger();
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    private static PerfHandle remotePerfHandle = null;
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    /**
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     * Exports the specified connector address to the instrumentation buffer
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     * so that it can be read by this or other Java virtual machines running
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     * on the same system.
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     *
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     * @param address The connector address.
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     */
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    public static void export(String address) {
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        if (address == null || address.length() == 0) {
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            throw new IllegalArgumentException("address not specified");
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        }
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        Perf perf = Perf.getPerf();
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        perf.createString(
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            CONNECTOR_ADDRESS_COUNTER, 1, Units.STRING.intValue(), address);
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    }
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    public static void unexportRemote() {
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        unexport(remotePerfHandle);
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    }
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    private static void unexport(PerfHandle ph) {
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        if (ph != null) {
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            ph.putLong(-1L);
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        }
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    }
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    /**
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     * Imports the connector address from the instrument buffer
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     * of the specified Java virtual machine.
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     *
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     * @param vmid an identifier that uniquely identifies a local Java virtual
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     * machine, or <code>0</code> to indicate the current Java virtual machine.
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     *
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     * @return the value of the connector address, or <code>null</code> if the
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     * target VM has not exported a connector address.
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     *
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     * @throws IOException An I/O error occurred while trying to acquire the
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     * instrumentation buffer.
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     */
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    public static String importFrom(int vmid) throws IOException {
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        Perf perf = Perf.getPerf();
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        ByteBuffer bb;
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        try {
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            bb = perf.attach(vmid, "r");
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        } catch (IllegalArgumentException iae) {
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            throw new IOException(iae.getMessage());
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        }
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        List<Counter> counters =
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                new PerfInstrumentation(bb).findByPattern(CONNECTOR_ADDRESS_COUNTER);
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        Iterator<Counter> i = counters.iterator();
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        if (i.hasNext()) {
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            Counter c = i.next();
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            return (String) c.getValue();
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        } else {
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            return null;
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        }
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    }
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    /**
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     * Exports the specified remote connector address and associated
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     * configuration properties to the instrumentation buffer so that
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     * it can be read by this or other Java virtual machines running
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     * on the same system.
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     *
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     * @param properties The remote connector address properties.
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     */
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    public static void exportRemote(Map<String, String> properties) {
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        final int index = counter.getAndIncrement();
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        Perf perf = Perf.getPerf();
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        for (Map.Entry<String, String> entry : properties.entrySet()) {
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            perf.createString(REMOTE_CONNECTOR_COUNTER_PREFIX + index + "." +
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                    entry.getKey(), 1, Units.STRING.intValue(), entry.getValue());
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        }
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        if (remotePerfHandle != null) {
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            remotePerfHandle.putLong(index);
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        } else {
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            remotePerfHandle = new PerfHandle(
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                perf.createLong(REMOTE_CONNECTOR_STATE_COUNTER, 1, Units.NONE.intValue(), (long)index)
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            );
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        }
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    }
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    /**
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     * Imports the remote connector address and associated
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     * configuration properties from the instrument buffer
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     * of the specified Java virtual machine.
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     *
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     * @param vmid an identifier that uniquely identifies a local Java virtual
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     * machine, or <code>0</code> to indicate the current Java virtual machine.
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     *
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     * @return a map containing the remote connector's properties, or an empty
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     * map if the target VM has not exported the remote connector's properties.
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     *
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     * @throws IOException An I/O error occurred while trying to acquire the
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     * instrumentation buffer.
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     */
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    public static Map<String, String> importRemoteFrom(int vmid) throws IOException {
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        Perf perf = Perf.getPerf();
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        ByteBuffer bb;
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        try {
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            bb = perf.attach(vmid, "r");
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        } catch (IllegalArgumentException iae) {
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            throw new IOException(iae.getMessage());
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        }
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        List<Counter> counters = new PerfInstrumentation(bb).getAllCounters();
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        Map<String, String> properties = new HashMap<>();
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        for (Counter c : counters) {
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            String name =  c.getName();
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            if (name.startsWith(REMOTE_CONNECTOR_COUNTER_PREFIX) &&
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                    !name.equals(CONNECTOR_ADDRESS_COUNTER)) {
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                properties.put(name, c.getValue().toString());
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            }
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        }
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        return properties;
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    }
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}