/*
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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 2006-2010 Sun Microsystems, Inc.
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*/
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package org.opends.server.monitors;
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import static org.opends.server.loggers.debug.DebugLogger.*;
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import java.lang.reflect.Method;
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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.backends.jeb.RootContainer;
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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.loggers.debug.DebugTracer;
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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.DebugLogLevel;
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import org.opends.server.types.InitializationException;
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import com.sleepycat.je.DatabaseException;
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import com.sleepycat.je.EnvironmentStats;
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import com.sleepycat.je.JEVersion;
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import com.sleepycat.je.StatsConfig;
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import com.sleepycat.je.TransactionStats;
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/**
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* A monitor provider for a Berkeley DB JE environment.
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* It uses reflection on the environment statistics object
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* so that we don't need to keep a list of all the stats.
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*/
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public class DatabaseEnvironmentMonitor
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extends MonitorProvider<MonitorProviderCfg>
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{
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/**
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* The tracer object for the debug logger.
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*/
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private static final DebugTracer TRACER = getTracer();
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/**
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* The name of this monitor instance.
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*/
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private String name;
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/**
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* The root container to be monitored.
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*/
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private RootContainer rootContainer;
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/**
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* Creates a new database environment monitor.
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* @param name The monitor instance name.
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* @param rootContainer A root container handle for the database to be
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* monitored.
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*/
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public DatabaseEnvironmentMonitor(String name, RootContainer rootContainer)
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{
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this.name = name;
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this.rootContainer = rootContainer;
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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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}
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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 name;
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}
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/**
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* Creates monitor attribute values for a given JE statistics object,
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* using reflection to call all the getter methods of the statistics object.
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* The attribute type names of the created attribute values are derived from
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* the names of the getter methods.
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* @param monitorAttrs The monitor attribute values are inserted into this
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* attribute list.
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* @param stats The JE statistics object.
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* @param attrPrefix A common prefix for the attribute type names of the
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* monitor attribute values, to distinguish the attributes of one
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* type of statistical object from another, and to avoid attribute name
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* collisions.
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*/
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private void addAttributesForStatsObject(ArrayList<Attribute> monitorAttrs,
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Object stats, String attrPrefix)
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{
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Class<?> c = stats.getClass();
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Method[] methods = c.getMethods();
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// Iterate through all the statistic class methods.
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for (Method method : methods)
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{
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// Invoke all the getters returning integer values.
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if (method.getName().startsWith("get"))
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{
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Class<?> returnType = method.getReturnType();
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if (returnType.equals(int.class) || returnType.equals(long.class))
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{
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AttributeSyntax<?> integerSyntax =
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DirectoryServer.getDefaultIntegerSyntax();
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// Remove the 'get' from the method name and add the prefix.
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String attrName = attrPrefix + method.getName().substring(3);
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try
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{
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// Read the statistic.
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Object statValue = method.invoke(stats);
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// Create an attribute from the statistic.
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AttributeType attrType =
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DirectoryServer.getDefaultAttributeType(attrName,
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integerSyntax);
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monitorAttrs.add(Attributes.create(attrType, String
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.valueOf(statValue)));
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} catch (Exception e)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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}
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}
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}
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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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EnvironmentStats environmentStats = null;
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TransactionStats transactionStats = null;
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StatsConfig statsConfig = new StatsConfig();
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try
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{
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environmentStats = rootContainer.getEnvironmentStats(statsConfig);
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transactionStats =
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rootContainer.getEnvironmentTransactionStats(statsConfig);
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} catch (DatabaseException e)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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return null;
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}
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ArrayList<Attribute> monitorAttrs = new ArrayList<Attribute>();
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String jeVersion = JEVersion.CURRENT_VERSION.getVersionString();
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AttributeType versionType =
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DirectoryServer.getDefaultAttributeType("JEVersion");
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monitorAttrs.add(Attributes.create(versionType, jeVersion));
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addAttributesForStatsObject(monitorAttrs, environmentStats, "Environment");
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addAttributesForStatsObject(monitorAttrs, transactionStats, "Transaction");
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return monitorAttrs;
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}
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}
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