[ONOS-4176] Implement influxdb retriever for querying metrics
Change-Id: Ia1f3fc4fb3c76fafd003320940b8fe16b039ddae
diff --git a/apps/influxdbmetrics/features.xml b/apps/influxdbmetrics/features.xml
index 359bde6..9cbaea3 100644
--- a/apps/influxdbmetrics/features.xml
+++ b/apps/influxdbmetrics/features.xml
@@ -21,5 +21,10 @@
<bundle>mvn:${project.groupId}/onos-app-influxdb/${project.version}</bundle>
<bundle>wrap:mvn:com.izettle/metrics-influxdb/1.1.1$Bundle-SymbolicName=metrics-influxdb&Bundle-Version=1.1.1</bundle>
<bundle>mvn:commons-codec/commons-codec/1.10</bundle>
+ <bundle>wrap:mvn:org.influxdb/influxdb-java/2.1$Bundle-SymbolicName=influxdb-java&Bundle-Version=2.1</bundle>
+ <bundle>wrap:mvn:com.squareup.retrofit/retrofit/1.9.0$Bundle-SymbolicName=retrofit&Bundle-Version=1.9.0</bundle>
+ <bundle>wrap:mvn:com.squareup.okhttp/okhttp/2.4.0$Bundle-SymbolicName=okhttp&Bundle-Version=2.4.0</bundle>
+ <bundle>wrap:mvn:com.squareup.okio/okio/1.4.0$Bundle-SymbolicName=okio&Bundle-Version=1.4.0</bundle>
+ <bundle>mvn:com.google.code.gson/gson/2.3.1</bundle>
</feature>
</features>
diff --git a/apps/influxdbmetrics/pom.xml b/apps/influxdbmetrics/pom.xml
index 3eeca29..c06a0eb 100644
--- a/apps/influxdbmetrics/pom.xml
+++ b/apps/influxdbmetrics/pom.xml
@@ -71,6 +71,11 @@
<version>1.1.1</version>
</dependency>
<dependency>
+ <groupId>org.influxdb</groupId>
+ <artifactId>influxdb-java</artifactId>
+ <version>2.1</version>
+ </dependency>
+ <dependency>
<groupId>org.onosproject</groupId>
<artifactId>onos-api</artifactId>
<version>${project.version}</version>
diff --git a/apps/influxdbmetrics/src/main/java/org/onosproject/influxdbmetrics/DefaultInfluxDbMetricsRetriever.java b/apps/influxdbmetrics/src/main/java/org/onosproject/influxdbmetrics/DefaultInfluxDbMetricsRetriever.java
new file mode 100644
index 0000000..c911e27
--- /dev/null
+++ b/apps/influxdbmetrics/src/main/java/org/onosproject/influxdbmetrics/DefaultInfluxDbMetricsRetriever.java
@@ -0,0 +1,464 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * 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.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Modified;
+import org.apache.felix.scr.annotations.Property;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.influxdb.InfluxDB;
+import org.influxdb.InfluxDBFactory;
+import org.influxdb.dto.Query;
+import org.influxdb.dto.QueryResult;
+import org.onlab.util.Tools;
+import org.onosproject.cfg.ComponentConfigService;
+import org.onosproject.cluster.NodeId;
+import org.onosproject.core.CoreService;
+import org.osgi.service.component.ComponentContext;
+import org.slf4j.Logger;
+
+import java.util.Dictionary;
+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
+public class DefaultInfluxDbMetricsRetriever implements InfluxDbMetricsRetriever {
+
+ private final Logger log = getLogger(getClass());
+
+ private static final String DEFAULT_PROTOCOL = "http";
+ private static final String DEFAULT_ADDRESS = "localhost";
+ private static final int DEFAULT_PORT = 8086;
+ private static final String DEFAULT_DATABASE = "onos";
+ private static final String DEFAULT_USERNAME = "onos";
+ private static final String DEFAULT_PASSWORD = "onos.password";
+ 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_UNARY)
+ protected CoreService coreService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected ComponentConfigService cfgService;
+
+ @Property(name = "address", value = DEFAULT_ADDRESS,
+ label = "IP address of influxDB server; " +
+ "default is localhost")
+ protected String address = DEFAULT_ADDRESS;
+
+ @Property(name = "port", intValue = DEFAULT_PORT,
+ label = "Port number of influxDB server; " +
+ "default is 8086")
+ protected int port = DEFAULT_PORT;
+
+ @Property(name = "database", value = DEFAULT_DATABASE,
+ label = "Database name of influxDB server; " +
+ "default is onos")
+ protected String database = DEFAULT_DATABASE;
+
+ @Property(name = "username", value = DEFAULT_USERNAME,
+ label = "Username of influxDB server; default is onos")
+ protected String username = DEFAULT_USERNAME;
+
+ @Property(name = "password", value = DEFAULT_PASSWORD,
+ label = "Password of influxDB server; default is onos.password")
+ protected String password = DEFAULT_PASSWORD;
+
+ InfluxDB influxDB;
+
+ @Activate
+ public void activate() {
+ cfgService.registerProperties(getClass());
+ coreService.registerApplication("org.onosproject.influxdbmetrics");
+
+ config();
+
+ log.info("Started");
+ }
+
+ @Deactivate
+ public void deactivate() {
+ cfgService.unregisterProperties(getClass(), false);
+
+ log.info("Stopped");
+ }
+
+ @Modified
+ public void modified(ComponentContext context) {
+ readComponentConfiguration(context);
+ config();
+ }
+
+ private void config() {
+ StringBuilder url = new StringBuilder();
+ url.append(DEFAULT_PROTOCOL);
+ url.append(COLON_SEPARATOR + SLASH_SEPARATOR);
+ url.append(address);
+ url.append(COLON_SEPARATOR);
+ url.append(port);
+
+ influxDB = InfluxDBFactory.connect(url.toString(), username, password);
+ }
+
+ @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;
+ }
+ }
+
+ /**
+ * Extracts properties from the component configuration context.
+ *
+ * @param context the component context
+ */
+ private void readComponentConfiguration(ComponentContext context) {
+ Dictionary<?, ?> properties = context.getProperties();
+
+ String addressStr = Tools.get(properties, "address");
+ address = addressStr != null ? addressStr : DEFAULT_ADDRESS;
+ log.info("Configured. InfluxDB server address is {}", address);
+
+ String databaseStr = Tools.get(properties, "database");
+ database = databaseStr != null ? databaseStr : DEFAULT_DATABASE;
+ log.info("Configured. InfluxDB server database is {}", database);
+
+ String usernameStr = Tools.get(properties, "username");
+ username = usernameStr != null ? usernameStr : DEFAULT_USERNAME;
+ log.info("Configured. InfluxDB server username is {}", username);
+
+ String passwordStr = Tools.get(properties, "password");
+ password = passwordStr != null ? passwordStr : DEFAULT_PASSWORD;
+ log.info("Configured. InfluxDB server password is {}", password);
+
+ Integer portConfigured = Tools.getIntegerProperty(properties, "port");
+ if (portConfigured == null) {
+ port = DEFAULT_PORT;
+ log.info("InfluxDB port is not configured, default value is {}", port);
+ } else {
+ port = portConfigured;
+ log.info("Configured. InfluxDB port is configured to {}", port);
+ }
+ }
+}
diff --git a/apps/influxdbmetrics/src/main/java/org/onosproject/influxdbmetrics/DefaultInfluxMetric.java b/apps/influxdbmetrics/src/main/java/org/onosproject/influxdbmetrics/DefaultInfluxMetric.java
new file mode 100644
index 0000000..509332b
--- /dev/null
+++ b/apps/influxdbmetrics/src/main/java/org/onosproject/influxdbmetrics/DefaultInfluxMetric.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * 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 org.apache.commons.lang.StringUtils;
+import org.joda.time.DateTime;
+import org.joda.time.format.DateTimeFormat;
+import org.joda.time.format.DateTimeFormatter;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Default implementation of influx metric.
+ */
+public final class DefaultInfluxMetric implements InfluxMetric {
+
+ private double oneMinRate;
+ private DateTime time;
+
+ private DefaultInfluxMetric(double oneMinRate, DateTime time) {
+ this.oneMinRate = oneMinRate;
+ this.time = time;
+ }
+
+ @Override
+ public double oneMinRate() {
+ return oneMinRate;
+ }
+
+ @Override
+ public DateTime time() {
+ return time;
+ }
+
+ public static final class Builder implements InfluxMetric.Builder {
+
+ private double oneMinRate;
+ private String timestamp;
+ private static final String TIMESTAMP_MSG = "Must specify a timestamp.";
+ private static final String ONE_MIN_RATE_MSG = "Must specify one minute rate.";
+
+ public Builder() {
+ }
+
+ @Override
+ public InfluxMetric.Builder oneMinRate(double rate) {
+ this.oneMinRate = rate;
+ return this;
+ }
+
+ @Override
+ public InfluxMetric.Builder time(String time) {
+ this.timestamp = time;
+ return this;
+ }
+
+ @Override
+ public InfluxMetric build() {
+ checkNotNull(oneMinRate, ONE_MIN_RATE_MSG);
+ checkNotNull(timestamp, TIMESTAMP_MSG);
+
+ return new DefaultInfluxMetric(oneMinRate, parseTime(timestamp));
+ }
+
+ private DateTime parseTime(String time) {
+ String reformatTime = StringUtils.replace(StringUtils.replace(time, "T", " "), "Z", "");
+ DateTimeFormatter formatter = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss");
+ return formatter.parseDateTime(reformatTime);
+ }
+ }
+}
diff --git a/apps/influxdbmetrics/src/main/java/org/onosproject/influxdbmetrics/InfluxDbMetricsRetriever.java b/apps/influxdbmetrics/src/main/java/org/onosproject/influxdbmetrics/InfluxDbMetricsRetriever.java
new file mode 100644
index 0000000..d83d032
--- /dev/null
+++ b/apps/influxdbmetrics/src/main/java/org/onosproject/influxdbmetrics/InfluxDbMetricsRetriever.java
@@ -0,0 +1,100 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * 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 org.onosproject.cluster.NodeId;
+
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * A Metric retriever interface for querying metrics value from influxDB server.
+ */
+public interface InfluxDbMetricsRetriever {
+
+ /**
+ * Returns last metric values from all nodes.
+ *
+ * @return all metrics from all nodes
+ */
+ Map<NodeId, Map<String, InfluxMetric>> allMetrics();
+
+ /**
+ * Returns last metric values from a node.
+ *
+ * @param nodeId node identification
+ * @return all metrics from a given node
+ */
+ Map<String, InfluxMetric> metricsByNodeId(NodeId nodeId);
+
+ /**
+ * Returns a collection of last metric values from all nodes.
+ *
+ * @param metricName metric name
+ * @return a collection of metrics from all nodes
+ */
+ Map<NodeId, InfluxMetric> metricsByName(String metricName);
+
+ /**
+ * Returns a last metric value from a given node.
+ *
+ * @param nodeId node identification
+ * @param metricName metric name
+ * @return a metric value from a given node
+ */
+ InfluxMetric metric(NodeId nodeId, String metricName);
+
+ /**
+ * Returns metric values of all nodes within a given period of time.
+ *
+ * @param period projected period
+ * @param unit time unit
+ * @return all metric values of all nodes
+ */
+ Map<NodeId, Map<String, List<InfluxMetric>>> allMetrics(int period, TimeUnit unit);
+
+ /**
+ * Returns metric values of a node within a given period of time.
+ *
+ * @param nodeId node identification
+ * @param period projected period
+ * @param unit time unit
+ * @return metric value of a node
+ */
+ Map<String, List<InfluxMetric>> metricsByNodeId(NodeId nodeId, int period, TimeUnit unit);
+
+ /**
+ * Returns a collection of last metric values of all nodes within a given period of time.
+ *
+ * @param metricName metric name
+ * @param period projected period
+ * @param unit time unit
+ * @return metric value of all nodes
+ */
+ Map<NodeId, List<InfluxMetric>> metricsByName(String metricName, int period, TimeUnit unit);
+
+ /**
+ * Returns metric value of a given node within a given period of time.
+ *
+ * @param nodeId node identification
+ * @param metricName metric name
+ * @param period projected period
+ * @param unit time unit
+ * @return metric value of a node
+ */
+ List<InfluxMetric> metric(NodeId nodeId, String metricName, int period, TimeUnit unit);
+}
diff --git a/apps/influxdbmetrics/src/main/java/org/onosproject/influxdbmetrics/InfluxMetric.java b/apps/influxdbmetrics/src/main/java/org/onosproject/influxdbmetrics/InfluxMetric.java
new file mode 100644
index 0000000..1f77b4b
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+++ b/apps/influxdbmetrics/src/main/java/org/onosproject/influxdbmetrics/InfluxMetric.java
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+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * 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 org.joda.time.DateTime;
+
+/**
+ * Metric that represents all values queried from influx database.
+ */
+public interface InfluxMetric {
+
+ /**
+ * Returns one minute rate of the given metric.
+ *
+ * @return one minute rate of the given metric
+ */
+ double oneMinRate();
+
+
+ /**
+ * Returns collected timestamp of the given metric.
+ *
+ * @return collected timestamp of the given metric
+ */
+ DateTime time();
+
+ /**
+ * A builder of InfluxMetric.
+ */
+ interface Builder {
+
+ /**
+ * Sets one minute rate.
+ *
+ * @param rate one minute rate
+ * @return builder object
+ */
+ Builder oneMinRate(double rate);
+
+ /**
+ * Sets collected timestamp.
+ *
+ * @param time timestamp
+ * @return builder object
+ */
+ Builder time(String time);
+
+ /**
+ * Builds a influx metric instance.
+ *
+ * @return influx metric instance
+ */
+ InfluxMetric build();
+ }
+}