apps/influxdbmetrics/src/main/java/org/onosproject/influxdbmetrics/DefaultInfluxDbMetricsRetriever.java - onos - Gitiles

 /*
  * Copyright 2016-present Open Networking Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 package org.onosproject.influxdbmetrics;

 import com.google.common.collect.BiMap;
 import com.google.common.collect.EnumHashBiMap;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import org.apache.commons.lang.StringUtils;
 import org.influxdb.InfluxDB;
 import org.influxdb.InfluxDBFactory;
 import org.influxdb.dto.Query;
 import org.influxdb.dto.QueryResult;
 import org.onosproject.cluster.NodeId;
 import org.onosproject.core.CoreService;
 import org.osgi.service.component.annotations.Activate;
 import org.osgi.service.component.annotations.Component;
 import org.osgi.service.component.annotations.Deactivate;
 import org.osgi.service.component.annotations.Reference;
 import org.osgi.service.component.annotations.ReferenceCardinality;
 import org.slf4j.Logger;

 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;

 import static org.slf4j.LoggerFactory.getLogger;

 /**
  * A Metric retriever implementation for querying metrics from influxDB server.
  */
 @Component(immediate = true, service = InfluxDbMetricsRetriever.class)
 public class DefaultInfluxDbMetricsRetriever implements InfluxDbMetricsRetriever {

     private final Logger log = getLogger(getClass());

     private static final String DEFAULT_PROTOCOL = "http";
     private static final String DEFAULT_POLICY = "default";
     private static final String COLON_SEPARATOR = ":";
     private static final String SLASH_SEPARATOR = "//";
     private static final String BRACKET_START = "[";
     private static final String BRACKET_END = "]";
     private static final String METRIC_DELIMITER = ".";
     private static final int NUB_OF_DELIMITER = 3;

     private static final BiMap<TimeUnit, String> TIME_UNIT_MAP =
             EnumHashBiMap.create(TimeUnit.class);

     static {
         // key is TimeUnit enumeration type
         // value is influx database time unit keyword
         TIME_UNIT_MAP.put(TimeUnit.DAYS, "d");
         TIME_UNIT_MAP.put(TimeUnit.HOURS, "h");
         TIME_UNIT_MAP.put(TimeUnit.MINUTES, "m");
         TIME_UNIT_MAP.put(TimeUnit.SECONDS, "s");
     }

     @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected CoreService coreService;

     protected String database;

     InfluxDB influxDB;

     @Activate
     public void activate() {
         coreService.registerApplication("org.onosproject.influxdbmetrics");

         log.info("Started");
     }

     @Deactivate
     public void deactivate() {
         log.info("Stopped");
     }

     @Override
     public void config(String address, int port, String database, String username, String password) {
         StringBuilder url = new StringBuilder();
         url.append(DEFAULT_PROTOCOL);
         url.append(COLON_SEPARATOR + SLASH_SEPARATOR);
         url.append(address);
         url.append(COLON_SEPARATOR);
         url.append(port);

         this.influxDB = InfluxDBFactory.connect(url.toString(), username, password);
         this.database = database;
     }

     @Override
     public Map<NodeId, Map<String, List<InfluxMetric>>> allMetrics(int period,
                                                              TimeUnit unit) {
         Map<NodeId, Set<String>> nameMap = allMetricNames();
         Map<NodeId, Map<String, List<InfluxMetric>>> metricsMap = Maps.newHashMap();

         nameMap.forEach((nodeId, metricNames) ->
                 metricsMap.putIfAbsent(nodeId, metricsByNodeId(nodeId, period, unit))
         );

         return metricsMap;
     }

     @Override
     public Map<String, List<InfluxMetric>> metricsByNodeId(NodeId nodeId, int period,
                                                      TimeUnit unit) {
         Map<NodeId, Set<String>> nameMap = allMetricNames();
         Map<String, List<InfluxMetric>> map = Maps.newHashMap();

         nameMap.get(nodeId).forEach(metricName -> {
             List<InfluxMetric> value = metric(nodeId, metricName, period, unit);
             if (value != null) {
                 map.putIfAbsent(metricName, value);
             }
         });

         return map;
     }

     @Override
     public Map<NodeId, List<InfluxMetric>> metricsByName(String metricName, int period,
                                                    TimeUnit unit) {
         Map<NodeId, List<InfluxMetric>> map = Maps.newHashMap();
         List<InfluxMetric> metrics = Lists.newArrayList();
         String queryPrefix = new StringBuilder()
                 .append("SELECT m1_rate FROM")
                 .append(database)
                 .append(METRIC_DELIMITER)
                 .append(quote(DEFAULT_POLICY))
                 .append(METRIC_DELIMITER)
                 .toString();
         String querySuffix = new StringBuilder()
                 .append(" WHERE time > now() - ")
                 .append(period)
                 .append(unitString(unit))
                 .toString();

         allMetricNames().keySet().forEach(nodeId -> {
             String queryString = new StringBuilder()
                     .append(queryPrefix)
                     .append(quote(nodeId + METRIC_DELIMITER + metricName))
                     .append(querySuffix)
                     .toString();
             Query query = new Query(queryString, database);
             List<QueryResult.Result> results = influxDB.query(query).getResults();

             if (results != null && results.get(0) != null
                     && results.get(0).getSeries() != null) {

                 results.get(0).getSeries().get(0).getValues().forEach(value ->
                     metrics.add(new DefaultInfluxMetric.Builder()
                             .time((String) value.get(0))
                             .oneMinRate((Double) value.get(1))
                             .build()));
                 map.putIfAbsent(nodeId, metrics);
             }
         });

         return map;
     }

     @Override
     public List<InfluxMetric> metric(NodeId nodeId, String metricName,
                                int period, TimeUnit unit) {
         List<InfluxMetric> metrics = Lists.newArrayList();
         String queryString = new StringBuilder()
                 .append("SELECT m1_rate FROM ")
                 .append(database)
                 .append(METRIC_DELIMITER)
                 .append(quote(DEFAULT_POLICY))
                 .append(METRIC_DELIMITER)
                 .append(quote(nodeId + METRIC_DELIMITER + metricName))
                 .append(" WHERE time > now() - ")
                 .append(period)
                 .append(unitString(unit))
                 .toString();

         Query query = new Query(queryString, database);
         List<QueryResult.Result> results = influxDB.query(query).getResults();

         if (results != null && results.get(0) != null
                 && results.get(0).getSeries() != null) {

             results.get(0).getSeries().get(0).getValues().forEach(value ->
                     metrics.add(new DefaultInfluxMetric.Builder()
                             .time((String) value.get(0))
                             .oneMinRate((Double) value.get(1))
                             .build()));
             return metrics;
         }

         return null;
     }

     @Override
     public Map<NodeId, Map<String, InfluxMetric>> allMetrics() {
         Map<NodeId, Set<String>> nameMap = allMetricNames();
         Map<NodeId, Map<String, InfluxMetric>> metricsMap = Maps.newHashMap();

         nameMap.forEach((nodeId, metricNames) ->
             metricsMap.putIfAbsent(nodeId, metricsByNodeId(nodeId))
         );

         return metricsMap;
     }

     @Override
     public Map<String, InfluxMetric> metricsByNodeId(NodeId nodeId) {
         Map<NodeId, Set<String>> nameMap = allMetricNames();
         Map<String, InfluxMetric> map = Maps.newHashMap();

         nameMap.get(nodeId).forEach(metricName -> {
             InfluxMetric value = metric(nodeId, metricName);
             if (value != null) {
                 map.putIfAbsent(metricName, value);
             }
         });

         return map;
     }

     @Override
     public Map<NodeId, InfluxMetric> metricsByName(String metricName) {
         Map<NodeId, InfluxMetric> map = Maps.newHashMap();
         String queryPrefix = new StringBuilder()
                 .append("SELECT m1_rate FROM")
                 .append(database)
                 .append(METRIC_DELIMITER)
                 .append(quote(DEFAULT_POLICY))
                 .append(METRIC_DELIMITER)
                 .toString();
         String querySuffix = new StringBuilder()
                 .append(" LIMIT 1")
                 .toString();

         allMetricNames().keySet().forEach(nodeId -> {
             String queryString = new StringBuilder()
                     .append(queryPrefix)
                     .append(quote(nodeId + METRIC_DELIMITER + metricName))
                     .append(querySuffix)
                     .toString();
             Query query = new Query(queryString, database);
             List<QueryResult.Result> results = influxDB.query(query).getResults();

             if (results != null && results.get(0) != null
                     && results.get(0).getSeries() != null) {
                 InfluxMetric metric = new DefaultInfluxMetric.Builder()
                         .time((String) results.get(0).getSeries().get(0).getValues().get(0).get(0))
                         .oneMinRate((Double) results.get(0).getSeries().get(0)
                                 .getValues().get(0).get(1)).build();
                 map.putIfAbsent(nodeId, metric);
             }
         });

         return map;
     }

     @Override
     public InfluxMetric metric(NodeId nodeId, String metricName) {
         String queryString = new StringBuilder()
                 .append("SELECT m1_rate FROM ")
                 .append(database)
                 .append(METRIC_DELIMITER)
                 .append(quote(DEFAULT_POLICY))
                 .append(METRIC_DELIMITER)
                 .append(quote(nodeId + METRIC_DELIMITER + metricName))
                 .append(" LIMIT 1")
                 .toString();

         Query query = new Query(queryString, database);
         List<QueryResult.Result> results = influxDB.query(query).getResults();

         if (results != null && results.get(0) != null
                 && results.get(0).getSeries() != null) {
             return new DefaultInfluxMetric.Builder()
                     .time((String) results.get(0).getSeries().get(0).getValues().get(0).get(0))
                     .oneMinRate((Double) results.get(0).getSeries().get(0)
                             .getValues().get(0).get(1)).build();
         }

         return null;
     }

     private String unitString(TimeUnit unit) {
         return TIME_UNIT_MAP.get(unit) == null ? "h" : TIME_UNIT_MAP.get(unit);
     }

     private String quote(String str) {
         return "\"" + str + "\"";
     }

     /**
      * Returns all metric names that bound with node identification.
      *
      * @return all metric names
      */
     protected Map<NodeId, Set<String>> allMetricNames() {
         Map<NodeId, Set<String>> metricNameMap = Maps.newHashMap();
         Query query = new Query("SHOW MEASUREMENTS", database);
         List<QueryResult.Result> results = influxDB.query(query).getResults();
         List<List<Object>> rawMetricNames = results.get(0).getSeries().get(0).getValues();

         rawMetricNames.forEach(rawMetricName -> {
             String nodeIdStr = getNodeId(strip(rawMetricName.toString()));

             if (nodeIdStr != null) {
                 NodeId nodeId = NodeId.nodeId(nodeIdStr);
                 String metricName = getMetricName(strip(rawMetricName.toString()));

                 if (!metricNameMap.containsKey(nodeId)) {
                     metricNameMap.putIfAbsent(nodeId, Sets.newHashSet());
                 }

                 if (metricName != null) {
                     metricNameMap.get(nodeId).add(metricName);
                 }
             }
         });

         return metricNameMap;
     }

     /**
      * Strips special bracket from the full name.
      *
      * @param fullName full name
      * @return bracket stripped string
      */
     private String strip(String fullName) {
         return StringUtils.strip(StringUtils.strip(fullName, BRACKET_START), BRACKET_END);
     }

     /**
      * Returns metric name from full name.
      * The elements in full name is split by using '.';
      * We assume that the metric name always comes after the last three '.'
      *
      * @param fullName full name
      * @return metric name
      */
     private String getMetricName(String fullName) {
         int index = StringUtils.lastOrdinalIndexOf(fullName,
                 METRIC_DELIMITER, NUB_OF_DELIMITER);
         if (index != -1) {
             return StringUtils.substring(fullName, index + 1);
         } else {
             log.warn("Database {} contains malformed metric name.", database);
             return null;
         }
     }

     /**
      * Returns node id from full name.
      * The elements in full name is split by using '.';
      * We assume that the node id always comes before the last three '.'
      *
      * @param fullName full name
      * @return node id
      */
     private String getNodeId(String fullName) {
         int index = StringUtils.lastOrdinalIndexOf(fullName,
                 METRIC_DELIMITER, NUB_OF_DELIMITER);
         if (index != -1) {
             return StringUtils.substring(fullName, 0, index);
         } else {
             log.warn("Database {} contains malformed node id.", database);
             return null;
         }
     }
 }
	/*
	* Copyright 2016-present Open Networking Foundation
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	package org.onosproject.influxdbmetrics;

	import com.google.common.collect.BiMap;
	import com.google.common.collect.EnumHashBiMap;
	import com.google.common.collect.Lists;
	import com.google.common.collect.Maps;
	import com.google.common.collect.Sets;
	import org.apache.commons.lang.StringUtils;
	import org.influxdb.InfluxDB;
	import org.influxdb.InfluxDBFactory;
	import org.influxdb.dto.Query;
	import org.influxdb.dto.QueryResult;
	import org.onosproject.cluster.NodeId;
	import org.onosproject.core.CoreService;
	import org.osgi.service.component.annotations.Activate;
	import org.osgi.service.component.annotations.Component;
	import org.osgi.service.component.annotations.Deactivate;
	import org.osgi.service.component.annotations.Reference;
	import org.osgi.service.component.annotations.ReferenceCardinality;
	import org.slf4j.Logger;

	import java.util.List;
	import java.util.Map;
	import java.util.Set;
	import java.util.concurrent.TimeUnit;

	import static org.slf4j.LoggerFactory.getLogger;

	/**
	* A Metric retriever implementation for querying metrics from influxDB server.
	*/
	@Component(immediate = true, service = InfluxDbMetricsRetriever.class)
	public class DefaultInfluxDbMetricsRetriever implements InfluxDbMetricsRetriever {

	private final Logger log = getLogger(getClass());

	private static final String DEFAULT_PROTOCOL = "http";
	private static final String DEFAULT_POLICY = "default";
	private static final String COLON_SEPARATOR = ":";
	private static final String SLASH_SEPARATOR = "//";
	private static final String BRACKET_START = "[";
	private static final String BRACKET_END = "]";
	private static final String METRIC_DELIMITER = ".";
	private static final int NUB_OF_DELIMITER = 3;

	private static final BiMap<TimeUnit, String> TIME_UNIT_MAP =
	EnumHashBiMap.create(TimeUnit.class);

	static {
	// key is TimeUnit enumeration type
	// value is influx database time unit keyword
	TIME_UNIT_MAP.put(TimeUnit.DAYS, "d");
	TIME_UNIT_MAP.put(TimeUnit.HOURS, "h");
	TIME_UNIT_MAP.put(TimeUnit.MINUTES, "m");
	TIME_UNIT_MAP.put(TimeUnit.SECONDS, "s");
	}

	@Reference(cardinality = ReferenceCardinality.MANDATORY)
	protected CoreService coreService;

	protected String database;

	InfluxDB influxDB;

	@Activate
	public void activate() {
	coreService.registerApplication("org.onosproject.influxdbmetrics");

	log.info("Started");
	}

	@Deactivate
	public void deactivate() {
	log.info("Stopped");
	}

	@Override
	public void config(String address, int port, String database, String username, String password) {
	StringBuilder url = new StringBuilder();
	url.append(DEFAULT_PROTOCOL);
	url.append(COLON_SEPARATOR + SLASH_SEPARATOR);
	url.append(address);
	url.append(COLON_SEPARATOR);
	url.append(port);

	this.influxDB = InfluxDBFactory.connect(url.toString(), username, password);
	this.database = database;
	}

	@Override
	public Map<NodeId, Map<String, List<InfluxMetric>>> allMetrics(int period,
	TimeUnit unit) {
	Map<NodeId, Set<String>> nameMap = allMetricNames();
	Map<NodeId, Map<String, List<InfluxMetric>>> metricsMap = Maps.newHashMap();

	nameMap.forEach((nodeId, metricNames) ->
	metricsMap.putIfAbsent(nodeId, metricsByNodeId(nodeId, period, unit))
	);

	return metricsMap;
	}

	@Override
	public Map<String, List<InfluxMetric>> metricsByNodeId(NodeId nodeId, int period,
	TimeUnit unit) {
	Map<NodeId, Set<String>> nameMap = allMetricNames();
	Map<String, List<InfluxMetric>> map = Maps.newHashMap();

	nameMap.get(nodeId).forEach(metricName -> {
	List<InfluxMetric> value = metric(nodeId, metricName, period, unit);
	if (value != null) {
	map.putIfAbsent(metricName, value);
	}
	});

	return map;
	}

	@Override
	public Map<NodeId, List<InfluxMetric>> metricsByName(String metricName, int period,
	TimeUnit unit) {
	Map<NodeId, List<InfluxMetric>> map = Maps.newHashMap();
	List<InfluxMetric> metrics = Lists.newArrayList();
	String queryPrefix = new StringBuilder()
	.append("SELECT m1_rate FROM")
	.append(database)
	.append(METRIC_DELIMITER)
	.append(quote(DEFAULT_POLICY))
	.append(METRIC_DELIMITER)
	.toString();
	String querySuffix = new StringBuilder()
	.append(" WHERE time > now() - ")
	.append(period)
	.append(unitString(unit))
	.toString();

	allMetricNames().keySet().forEach(nodeId -> {
	String queryString = new StringBuilder()
	.append(queryPrefix)
	.append(quote(nodeId + METRIC_DELIMITER + metricName))
	.append(querySuffix)
	.toString();
	Query query = new Query(queryString, database);
	List<QueryResult.Result> results = influxDB.query(query).getResults();

	if (results != null && results.get(0) != null
	&& results.get(0).getSeries() != null) {

	results.get(0).getSeries().get(0).getValues().forEach(value ->
	metrics.add(new DefaultInfluxMetric.Builder()
	.time((String) value.get(0))
	.oneMinRate((Double) value.get(1))
	.build()));
	map.putIfAbsent(nodeId, metrics);
	}
	});

	return map;
	}

	@Override
	public List<InfluxMetric> metric(NodeId nodeId, String metricName,
	int period, TimeUnit unit) {
	List<InfluxMetric> metrics = Lists.newArrayList();
	String queryString = new StringBuilder()
	.append("SELECT m1_rate FROM ")
	.append(database)
	.append(METRIC_DELIMITER)
	.append(quote(DEFAULT_POLICY))
	.append(METRIC_DELIMITER)
	.append(quote(nodeId + METRIC_DELIMITER + metricName))
	.append(" WHERE time > now() - ")
	.append(period)
	.append(unitString(unit))
	.toString();

	Query query = new Query(queryString, database);
	List<QueryResult.Result> results = influxDB.query(query).getResults();

	if (results != null && results.get(0) != null
	&& results.get(0).getSeries() != null) {

	results.get(0).getSeries().get(0).getValues().forEach(value ->
	metrics.add(new DefaultInfluxMetric.Builder()
	.time((String) value.get(0))
	.oneMinRate((Double) value.get(1))
	.build()));
	return metrics;
	}

	return null;
	}

	@Override
	public Map<NodeId, Map<String, InfluxMetric>> allMetrics() {
	Map<NodeId, Set<String>> nameMap = allMetricNames();
	Map<NodeId, Map<String, InfluxMetric>> metricsMap = Maps.newHashMap();

	nameMap.forEach((nodeId, metricNames) ->
	metricsMap.putIfAbsent(nodeId, metricsByNodeId(nodeId))
	);

	return metricsMap;
	}

	@Override
	public Map<String, InfluxMetric> metricsByNodeId(NodeId nodeId) {
	Map<NodeId, Set<String>> nameMap = allMetricNames();
	Map<String, InfluxMetric> map = Maps.newHashMap();

	nameMap.get(nodeId).forEach(metricName -> {
	InfluxMetric value = metric(nodeId, metricName);
	if (value != null) {
	map.putIfAbsent(metricName, value);
	}
	});

	return map;
	}

	@Override
	public Map<NodeId, InfluxMetric> metricsByName(String metricName) {
	Map<NodeId, InfluxMetric> map = Maps.newHashMap();
	String queryPrefix = new StringBuilder()
	.append("SELECT m1_rate FROM")
	.append(database)
	.append(METRIC_DELIMITER)
	.append(quote(DEFAULT_POLICY))
	.append(METRIC_DELIMITER)
	.toString();
	String querySuffix = new StringBuilder()
	.append(" LIMIT 1")
	.toString();

	allMetricNames().keySet().forEach(nodeId -> {
	String queryString = new StringBuilder()
	.append(queryPrefix)
	.append(quote(nodeId + METRIC_DELIMITER + metricName))
	.append(querySuffix)
	.toString();
	Query query = new Query(queryString, database);
	List<QueryResult.Result> results = influxDB.query(query).getResults();

	if (results != null && results.get(0) != null
	&& results.get(0).getSeries() != null) {
	InfluxMetric metric = new DefaultInfluxMetric.Builder()
	.time((String) results.get(0).getSeries().get(0).getValues().get(0).get(0))
	.oneMinRate((Double) results.get(0).getSeries().get(0)
	.getValues().get(0).get(1)).build();
	map.putIfAbsent(nodeId, metric);
	}
	});

	return map;
	}

	@Override
	public InfluxMetric metric(NodeId nodeId, String metricName) {
	String queryString = new StringBuilder()
	.append("SELECT m1_rate FROM ")
	.append(database)
	.append(METRIC_DELIMITER)
	.append(quote(DEFAULT_POLICY))
	.append(METRIC_DELIMITER)
	.append(quote(nodeId + METRIC_DELIMITER + metricName))
	.append(" LIMIT 1")
	.toString();

	Query query = new Query(queryString, database);
	List<QueryResult.Result> results = influxDB.query(query).getResults();

	if (results != null && results.get(0) != null
	&& results.get(0).getSeries() != null) {
	return new DefaultInfluxMetric.Builder()
	.time((String) results.get(0).getSeries().get(0).getValues().get(0).get(0))
	.oneMinRate((Double) results.get(0).getSeries().get(0)
	.getValues().get(0).get(1)).build();
	}

	return null;
	}

	private String unitString(TimeUnit unit) {
	return TIME_UNIT_MAP.get(unit) == null ? "h" : TIME_UNIT_MAP.get(unit);
	}

	private String quote(String str) {
	return "\"" + str + "\"";
	}

	/**
	* Returns all metric names that bound with node identification.
	*
	* @return all metric names
	*/
	protected Map<NodeId, Set<String>> allMetricNames() {
	Map<NodeId, Set<String>> metricNameMap = Maps.newHashMap();
	Query query = new Query("SHOW MEASUREMENTS", database);
	List<QueryResult.Result> results = influxDB.query(query).getResults();
	List<List<Object>> rawMetricNames = results.get(0).getSeries().get(0).getValues();

	rawMetricNames.forEach(rawMetricName -> {
	String nodeIdStr = getNodeId(strip(rawMetricName.toString()));

	if (nodeIdStr != null) {
	NodeId nodeId = NodeId.nodeId(nodeIdStr);
	String metricName = getMetricName(strip(rawMetricName.toString()));

	if (!metricNameMap.containsKey(nodeId)) {
	metricNameMap.putIfAbsent(nodeId, Sets.newHashSet());
	}

	if (metricName != null) {
	metricNameMap.get(nodeId).add(metricName);
	}
	}
	});

	return metricNameMap;
	}

	/**
	* Strips special bracket from the full name.
	*
	* @param fullName full name
	* @return bracket stripped string
	*/
	private String strip(String fullName) {
	return StringUtils.strip(StringUtils.strip(fullName, BRACKET_START), BRACKET_END);
	}

	/**
	* Returns metric name from full name.
	* The elements in full name is split by using '.';
	* We assume that the metric name always comes after the last three '.'
	*
	* @param fullName full name
	* @return metric name
	*/
	private String getMetricName(String fullName) {
	int index = StringUtils.lastOrdinalIndexOf(fullName,
	METRIC_DELIMITER, NUB_OF_DELIMITER);
	if (index != -1) {
	return StringUtils.substring(fullName, index + 1);
	} else {
	log.warn("Database {} contains malformed metric name.", database);
	return null;
	}
	}

	/**
	* Returns node id from full name.
	* The elements in full name is split by using '.';
	* We assume that the node id always comes before the last three '.'
	*
	* @param fullName full name
	* @return node id
	*/
	private String getNodeId(String fullName) {
	int index = StringUtils.lastOrdinalIndexOf(fullName,
	METRIC_DELIMITER, NUB_OF_DELIMITER);
	if (index != -1) {
	return StringUtils.substring(fullName, 0, index);
	} else {
	log.warn("Database {} contains malformed node id.", database);
	return null;
	}
	}
	}