/*
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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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* Portions Copyright 2006 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 java.util.LinkedHashSet;
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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.ConfigEntry;
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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.TraditionalWorkQueue;
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import org.opends.server.protocols.asn1.ASN1OctetString;
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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.AttributeValue;
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import org.opends.server.types.InitializationException;
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import static org.opends.server.loggers.Debug.*;
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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 TraditionalWorkQueueMonitor
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extends MonitorProvider
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{
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/**
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* The fully-qualified name of this class for debugging purposes.
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*/
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private static final String CLASS_NAME =
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"org.opends.server.monitors.WorkQueueMonitor";
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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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/**
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* The name to use for the monitor attribute that provides the total number of
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* requests that have been rejected because the work queue was full.
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*/
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public static final String ATTR_OPS_REJECTED_QUEUE_FULL =
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"requestsRejectedDueToQueueFull";
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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 traditional work queue instance with which this monitor is associated.
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private TraditionalWorkQueue 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 TraditionalWorkQueueMonitor(TraditionalWorkQueue workQueue)
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{
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super("Work Queue Monitor Provider");
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assert debugConstructor(CLASS_NAME);
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this.workQueue = workQueue;
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}
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/**
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* Initializes this monitor provider based on the information in the provided
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* configuration entry.
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*
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* @param configEntry The configuration entry that contains the information
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* to use to initialize this monitor provider.
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*
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* @throws ConfigException If an unrecoverable problem arises in the
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* process of performing the initialization.
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*
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* @throws InitializationException If a problem occurs during initialization
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* that is not related to the server
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* configuration.
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*/
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public void initializeMonitorProvider(ConfigEntry configEntry)
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throws ConfigException, InitializationException
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{
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assert debugEnter(CLASS_NAME, "initializeMonitorProvider",
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String.valueOf(configEntry));
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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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assert debugEnter(CLASS_NAME, "getMonitorInstanceName");
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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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assert debugEnter(CLASS_NAME, "getUpdateInterval");
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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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assert debugEnter(CLASS_NAME, "updateMonitorData");
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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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assert debugEnter(CLASS_NAME, "getMonitorData");
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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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long rejectedQueueFull = workQueue.getOpsRejectedDueToQueueFull();
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ArrayList<Attribute> monitorAttrs = new ArrayList<Attribute>();
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AttributeSyntax integerSyntax = DirectoryServer.getDefaultIntegerSyntax();
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// The current backlog.
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AttributeType attrType =
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DirectoryServer.getDefaultAttributeType(ATTR_CURRENT_BACKLOG,
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integerSyntax);
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ASN1OctetString valueString = new ASN1OctetString(String.valueOf(backlog));
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LinkedHashSet<AttributeValue> values = new LinkedHashSet<AttributeValue>();
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values.add(new AttributeValue(valueString, valueString));
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monitorAttrs.add(new Attribute(attrType, ATTR_CURRENT_BACKLOG, values));
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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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valueString = new ASN1OctetString(String.valueOf(averageBacklog));
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values = new LinkedHashSet<AttributeValue>();
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values.add(new AttributeValue(valueString, valueString));
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monitorAttrs.add(new Attribute(attrType, ATTR_AVERAGE_BACKLOG, values));
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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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valueString = new ASN1OctetString(String.valueOf(maxBacklog));
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values = new LinkedHashSet<AttributeValue>();
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values.add(new AttributeValue(valueString, valueString));
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monitorAttrs.add(new Attribute(attrType, ATTR_MAX_BACKLOG, values));
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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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valueString = new ASN1OctetString(String.valueOf(opsSubmitted));
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values = new LinkedHashSet<AttributeValue>();
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values.add(new AttributeValue(valueString, valueString));
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monitorAttrs.add(new Attribute(attrType, ATTR_OPS_SUBMITTED, values));
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// The total number of operations rejected due to a full work queue.
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attrType =
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DirectoryServer.getDefaultAttributeType(ATTR_OPS_REJECTED_QUEUE_FULL,
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integerSyntax);
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valueString = new ASN1OctetString(String.valueOf(rejectedQueueFull));
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values = new LinkedHashSet<AttributeValue>();
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values.add(new AttributeValue(valueString, valueString));
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monitorAttrs.add(new Attribute(attrType, ATTR_OPS_REJECTED_QUEUE_FULL,
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values));
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return monitorAttrs;
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}
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}
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