/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2006-2009 Sun Microsystems, Inc.
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*/
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package org.opends.server.monitors;
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import java.util.ArrayList;
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import org.opends.server.admin.std.server.MonitorProviderCfg;
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import org.opends.server.api.AttributeSyntax;
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import org.opends.server.api.MonitorProvider;
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import org.opends.server.config.ConfigException;
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import org.opends.server.core.DirectoryServer;
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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.opends.server.types.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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{
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/**
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* The name to use for the monitor attribute that provides the current request
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* backlog.
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*/
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public static final String ATTR_CURRENT_BACKLOG = "currentRequestBacklog";
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/**
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* The name to use for the monitor attribute that provides the average request
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* backlog.
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*/
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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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super("Work Queue Monitor Provider");
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this.workQueue = workQueue;
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}
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/**
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* {@inheritDoc}
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*/
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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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}
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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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public String getMonitorInstanceName()
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{
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return "Work Queue";
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}
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/**
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* Retrieves the length of time in milliseconds that should elapse between
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* calls to the <CODE>updateMonitorData()</CODE> method. A negative or zero
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* return value indicates that the <CODE>updateMonitorData()</CODE> method
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* should not be periodically invoked.
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*
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* @return The length of time in milliseconds that should elapse between
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* calls to the <CODE>updateMonitorData()</CODE> method.
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*/
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public long getUpdateInterval()
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{
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// We will poll the work queue every 10 seconds.
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return 10000;
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}
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/**
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* Performs any processing periodic processing that may be desired to update
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* the information associated with this monitor. Note that best-effort
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* attempts will be made to ensure that calls to this method come
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* <CODE>getUpdateInterval()</CODE> milliseconds apart, but no guarantees will
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* be made.
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*/
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public void updateMonitorData()
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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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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<Attribute>();
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AttributeSyntax<?> integerSyntax = DirectoryServer
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.getDefaultIntegerSyntax();
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// The current backlog.
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AttributeType attrType = DirectoryServer.getDefaultAttributeType(
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ATTR_CURRENT_BACKLOG, integerSyntax);
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monitorAttrs
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.add(Attributes.create(attrType, String.valueOf(backlog)));
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// The average backlog.
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attrType = DirectoryServer.getDefaultAttributeType(ATTR_AVERAGE_BACKLOG,
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integerSyntax);
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monitorAttrs.add(Attributes.create(attrType, String
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.valueOf(averageBacklog)));
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// The maximum backlog.
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attrType = DirectoryServer.getDefaultAttributeType(ATTR_MAX_BACKLOG,
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integerSyntax);
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monitorAttrs.add(Attributes.create(attrType, String
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.valueOf(maxBacklog)));
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// The total number of operations submitted.
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attrType = DirectoryServer.getDefaultAttributeType(ATTR_OPS_SUBMITTED,
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integerSyntax);
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monitorAttrs.add(Attributes.create(attrType, String
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.valueOf(opsSubmitted)));
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return monitorAttrs;
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}
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}
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