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Add OpenCensus sample code.
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‎opencensus/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Copyright 2018 Google LLC
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<!-- [START opencensus_pom] -->
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<project>
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<modelVersion>4.0.0</modelVersion>
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<packaging>jar</packaging>
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<groupId>com.example</groupId>
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<artifactId>opencensus-samples</artifactId>
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<version>1.0</version>
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<!--
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The parent pom defines common style checks and testing strategies for our samples.
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Removing or replacing it should not affect the execution of the samples in anyway.
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-->
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<parent>
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<groupId>com.google.cloud.samples</groupId>
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<artifactId>shared-configuration</artifactId>
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<version>1.0.10</version>
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</parent>
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<properties>
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven.compiler.target>1.8</maven.compiler.target>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<dependencies>
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<!-- [START dependencies] -->
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<dependency>
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<groupId>io.opencensus</groupId>
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<artifactId>opencensus-api</artifactId>
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<version>0.15.0</version>
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</dependency>
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<dependency>
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<groupId>io.opencensus</groupId>
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<artifactId>opencensus-impl</artifactId>
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<version>0.15.0</version>
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</dependency>
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<dependency>
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<groupId>io.opencensus</groupId>
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<artifactId>opencensus-exporter-stats-stackdriver</artifactId>
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<version>0.15.0</version>
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</dependency>
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<!-- [END dependencies] -->
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.codehaus.mojo</groupId>
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<artifactId>exec-maven-plugin</artifactId>
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<version>1.6.0</version>
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<executions>
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<execution>
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<goals>
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<goal>java</goal>
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</goals>
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</execution>
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</executions>
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<configuration>
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<mainClass>com.example.opencensus.Quickstart</mainClass>
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<cleanupDaemonThreads>false</cleanupDaemonThreads>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>
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<!-- [END opencensus_pom] -->

‎opencensus/src/main/java/com/example/opencensus/Quickstart.java

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/*
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* Copyright 2018 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.opencensus;
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// [START monitoring_opencensus_metrics_quickstart]
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import com.google.common.collect.Lists;
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import io.opencensus.exporter.stats.stackdriver.StackdriverStatsExporter;
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import io.opencensus.stats.Aggregation;
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import io.opencensus.stats.BucketBoundaries;
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import io.opencensus.stats.Measure.MeasureLong;
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import io.opencensus.stats.Stats;
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import io.opencensus.stats.StatsRecorder;
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import io.opencensus.stats.View;
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import io.opencensus.stats.View.Name;
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import io.opencensus.stats.ViewManager;
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import java.io.IOException;
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import java.util.Collections;
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import java.util.Random;
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import java.util.concurrent.TimeUnit;
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public class Quickstart {
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private static final int EXPORT_INTERVAL = 60;
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private static final MeasureLong LATENCY_MS = MeasureLong.create(
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"task_latency",
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"The task latency in milliseconds",
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"ms");
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// Latency in buckets:
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// [>=0ms, >=100ms, >=200ms, >=400ms, >=1s, >=2s, >=4s]
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private static final BucketBoundaries LATENCY_BOUNDARIES = BucketBoundaries.create(
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Lists.newArrayList(0d, 100d, 200d, 400d, 1000d, 2000d, 4000d));
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private static final StatsRecorder STATS_RECORDER = Stats.getStatsRecorder();
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public static void main(String[] args) throws IOException, InterruptedException {
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// Register the view. It is imperative that this step exists,
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// otherwise recorded metrics will be dropped and never exported.
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View view = View.create(
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Name.create("task_latency_distribution_4"),
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"The distribution of the task latencies.",
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LATENCY_MS,
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Aggregation.Distribution.create(LATENCY_BOUNDARIES),
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Collections.emptyList());
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ViewManager viewManager = Stats.getViewManager();
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viewManager.registerView(view);
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// [START setup_exporter]
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// Enable OpenCensus exporters to export metrics to Stackdriver Monitoring.
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// Exporters use Application Default Credentials to authenticate.
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// See https://developers.google.com/identity/protocols/application-default-credentials
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// for more details.
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StackdriverStatsExporter.createAndRegister();
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// [END setup_exporter]
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// [START example_code]
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// Record 100 fake latency values between 0 and 5 seconds.
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Random rand = new Random();
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for (int i = 0; i < 100; i++) {
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long ms = (long) (TimeUnit.MILLISECONDS.convert(5, TimeUnit.SECONDS) * rand.nextDouble());
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System.out.println(String.format("Latency %d: %d", i, ms));
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STATS_RECORDER.newMeasureMap().put(LATENCY_MS, ms).record();
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}
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// The default export interval is 60 seconds. The thread with the StackdriverStatsExporter must
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// live for at least the interval past any metrics that must be collected, or some risk being
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// lost if they are recorded after the last export.
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Thread.sleep(TimeUnit.MILLISECONDS.convert(EXPORT_INTERVAL, TimeUnit.SECONDS));
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// [END example_code]
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}
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}
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// [END monitoring_opencensus_metrics_quickstart]

‎pom.xml

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<module>memorystore/redis</module>
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<module>opencensus</module>
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<module>pubsub/cloud-client</module>
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<module>spanner/cloud-client</module>

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