/*
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* The contents of this file are subject to the terms of the Common Development and
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* Distribution License (the License). You may not use this file except in compliance with the
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* License.
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*
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* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
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* specific language governing permission and limitations under the License.
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*
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* When distributing Covered Software, include this CDDL Header Notice in each file and include
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* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
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* Header, with the fields enclosed by brackets [] replaced by your own identifying
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* information: "Portions Copyright [year] [name of copyright owner]".
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*
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* Copyright 2006-2010 Sun Microsystems, Inc.
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* Portions Copyright 2014-2016 ForgeRock AS.
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*/
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package org.opends.server.monitors;
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import static org.opends.server.core.DirectoryServer.*;
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import java.util.ArrayList;
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import java.util.concurrent.TimeUnit;
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import org.forgerock.opendj.config.server.ConfigException;
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import org.opends.server.admin.std.server.MonitorProviderCfg;
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import org.opends.server.api.MonitorProvider;
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import org.opends.server.extensions.ParallelWorkQueue;
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import org.opends.server.types.Attribute;
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import org.forgerock.opendj.ldap.schema.AttributeType;
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import org.opends.server.types.Attributes;
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import org.opends.server.types.InitializationException;
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/**
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* This class defines a Directory Server monitor that can be used to provide
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* information about the state of the work queue.
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*/
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public class ParallelWorkQueueMonitor
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extends MonitorProvider<MonitorProviderCfg>
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implements Runnable
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{
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/** The name to use for the monitor attribute that provides the current request backlog. */
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public static final String ATTR_CURRENT_BACKLOG = "currentRequestBacklog";
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/** The name to use for the monitor attribute that provides the average request backlog. */
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public static final String ATTR_AVERAGE_BACKLOG = "averageRequestBacklog";
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/**
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* The name to use for the monitor attribute that provides the maximum
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* observed request backlog.
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*/
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public static final String ATTR_MAX_BACKLOG = "maxRequestBacklog";
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/**
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* The name to use for the monitor attribute that provides the total number of
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* operations submitted.
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*/
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public static final String ATTR_OPS_SUBMITTED = "requestsSubmitted";
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/** The maximum backlog observed by polling the queue. */
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private int maxBacklog;
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/** The total number of times the backlog has been polled. */
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private long numPolls;
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/** The total backlog observed from periodic polling. */
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private long totalBacklog;
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/** The parallel work queue instance with which this monitor is associated. */
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private ParallelWorkQueue workQueue;
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/**
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* Initializes this monitor provider. Note that no initialization should be
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* done here, since it should be performed in the
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* <CODE>initializeMonitorProvider</CODE> class.
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*
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* @param workQueue The work queue with which this monitor is associated.
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*/
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public ParallelWorkQueueMonitor(ParallelWorkQueue workQueue)
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{
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this.workQueue = workQueue;
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}
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/** {@inheritDoc} */
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@Override
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public void initializeMonitorProvider(MonitorProviderCfg configuration)
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throws ConfigException, InitializationException
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{
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maxBacklog = 0;
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totalBacklog = 0;
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numPolls = 0;
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scheduleUpdate(this, 0, 10, TimeUnit.SECONDS);
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}
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/**
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* Retrieves the name of this monitor provider. It should be unique among all
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* monitor providers, including all instances of the same monitor provider.
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*
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* @return The name of this monitor provider.
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*/
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@Override
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public String getMonitorInstanceName()
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{
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return "Work Queue";
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}
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/** {@inheritDoc} */
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@Override
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public void run()
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{
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int backlog = workQueue.size();
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totalBacklog += backlog;
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numPolls++;
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if (backlog > maxBacklog)
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{
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maxBacklog = backlog;
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}
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}
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/**
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* Retrieves a set of attributes containing monitor data that should be
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* returned to the client if the corresponding monitor entry is requested.
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*
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* @return A set of attributes containing monitor data that should be
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* returned to the client if the corresponding monitor entry is
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* requested.
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*/
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@Override
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public ArrayList<Attribute> getMonitorData()
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{
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int backlog = workQueue.size();
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totalBacklog += backlog;
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numPolls++;
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if (backlog > maxBacklog)
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{
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maxBacklog = backlog;
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}
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long averageBacklog = (long) (1.0 * totalBacklog / numPolls);
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long opsSubmitted = workQueue.getOpsSubmitted();
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ArrayList<Attribute> monitorAttrs = new ArrayList<>();
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putAttribute(monitorAttrs, ATTR_CURRENT_BACKLOG, backlog);
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putAttribute(monitorAttrs, ATTR_AVERAGE_BACKLOG, averageBacklog);
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putAttribute(monitorAttrs, ATTR_MAX_BACKLOG, maxBacklog);
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// The total number of operations submitted.
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putAttribute(monitorAttrs, ATTR_OPS_SUBMITTED, opsSubmitted);
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return monitorAttrs;
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}
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private void putAttribute(ArrayList<Attribute> monitorAttrs, String attrName, Object value)
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{
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AttributeType attrType = getAttributeType(attrName, getDefaultIntegerSyntax());
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monitorAttrs.add(Attributes.create(attrType, String.valueOf(value)));
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}
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}
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