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Add task create & lease/acknowledge sample. (#1153)
* Add task create & lease/acknowledge sample. * Add Appengine Queue Tasks sample.
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‎appengine-java8/tasks/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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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<packaging>war</packaging>
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<version>1.0-SNAPSHOT</version>
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<groupId>com.example.appengine</groupId>
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<artifactId>appengine-tasks-j8</artifactId>
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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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<relativePath></relativePath>
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</parent>
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<properties>
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<maven.compiler.target>1.8</maven.compiler.target>
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven-exec-plugin.version>1.6.0</maven-exec-plugin.version>
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</properties>
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<dependencies>
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<!-- Compile/runtime dependencies -->
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>javax.servlet-api</artifactId>
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<version>3.1.0</version>
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<type>jar</type>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>com.google.cloud</groupId>
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<artifactId>google-cloud-tasks</artifactId>
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<version>0.54.0-beta</version>
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</dependency>
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<dependency>
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<groupId>commons-cli</groupId>
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<artifactId>commons-cli</artifactId>
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<version>1.4</version>
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<scope>compile</scope>
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</dependency>
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</dependencies>
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<build>
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<!-- for hot reload of the web application-->
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<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes
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</outputDirectory>
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<plugins>
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<plugin>
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<groupId>com.google.cloud.tools</groupId>
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<artifactId>appengine-maven-plugin</artifactId>
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<version>1.3.1</version>
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<configuration>
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<deploy.promote>true</deploy.promote>
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<deploy.stopPreviousVersion>true</deploy.stopPreviousVersion>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-war-plugin</artifactId>
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<version>3.1.0</version>
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</plugin>
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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>${maven-exec-plugin.version}</version>
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<configuration>
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<mainClass>com.example.task.CreateTask</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>

‎appengine-java8/tasks/src/main/java/com/example/task/CreateTask.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.task;
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import com.google.cloud.tasks.v2beta2.AppEngineHttpRequest;
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import com.google.cloud.tasks.v2beta2.CloudTasksClient;
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import com.google.cloud.tasks.v2beta2.HttpMethod;
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import com.google.cloud.tasks.v2beta2.QueueName;
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import com.google.cloud.tasks.v2beta2.Task;
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import com.google.common.base.Strings;
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import com.google.protobuf.ByteString;
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import com.google.protobuf.Timestamp;
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import java.nio.charset.Charset;
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import java.time.Clock;
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import java.time.Instant;
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import org.apache.commons.cli.CommandLine;
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import org.apache.commons.cli.CommandLineParser;
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import org.apache.commons.cli.DefaultParser;
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import org.apache.commons.cli.HelpFormatter;
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import org.apache.commons.cli.Option;
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import org.apache.commons.cli.Options;
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import org.apache.commons.cli.ParseException;
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public class CreateTask {
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private static String GGOGLE_CLOUD_PROJECT_KEY = "GOOGLE_CLOUD_PROJECT";
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private static Option PROJECT_ID_OPTION = Option.builder("pid")
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.longOpt("project-id")
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.desc("The Google Cloud Project, if not set as GOOGLE_CLOUD_PROJECT env var.")
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.hasArg()
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.argName("project-id")
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.type(String.class)
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.build();
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private static Option QUEUE_OPTION = Option.builder("q")
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.required()
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.longOpt("queue")
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.desc("The Cloud Tasks queue.")
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.hasArg()
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.argName("queue")
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.type(String.class)
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.build();
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private static Option LOCATION_OPTION = Option.builder("l")
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.required()
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.longOpt("location")
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.desc("The region in which your queue is running.")
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.hasArg()
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.argName("location")
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.type(String.class)
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.build();
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private static Option PAYLOAD_OPTION = Option.builder("p")
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.longOpt("payload")
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.desc("The payload string for the task.")
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.hasArg()
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.argName("payload")
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.type(String.class)
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.build();
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private static Option IN_SECONDS_OPTION = Option.builder("s")
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.longOpt("in-seconds")
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.desc("Schedule time for the task to create.")
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.hasArg()
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.argName("in-seconds")
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.type(int.class)
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.build();
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public static void main(String... args) throws Exception {
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Options options = new Options();
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options.addOption(PROJECT_ID_OPTION);
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options.addOption(QUEUE_OPTION);
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options.addOption(LOCATION_OPTION);
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options.addOption(PAYLOAD_OPTION);
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options.addOption(IN_SECONDS_OPTION);
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if (args.length == 0) {
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printUsage(options);
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return;
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}
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CommandLineParser parser = new DefaultParser();
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CommandLine params = null;
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try {
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params = parser.parse(options, args);
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} catch (ParseException e) {
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System.err.println("Invalid command line: " + e.getMessage());
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printUsage(options);
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return;
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}
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String projectId;
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if (params.hasOption("project-id")) {
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projectId = params.getOptionValue("project-id");
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} else {
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projectId = System.getenv(GGOGLE_CLOUD_PROJECT_KEY);
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}
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if (Strings.isNullOrEmpty(projectId)) {
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printUsage(options);
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return;
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}
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String queueName = params.getOptionValue(QUEUE_OPTION.getOpt());
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String location = params.getOptionValue(LOCATION_OPTION.getOpt());
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String payload = params.getOptionValue(PAYLOAD_OPTION.getOpt(), "default payload");
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// [START cloud_tasks_appengine_create_task]
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try (CloudTasksClient client = CloudTasksClient.create()) {
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Task.Builder taskBuilder = Task
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.newBuilder()
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.setAppEngineHttpRequest(AppEngineHttpRequest.newBuilder()
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.setPayload(ByteString.copyFrom(payload, Charset.defaultCharset()))
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.setRelativeUrl("/tasks/create")
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.setHttpMethod(HttpMethod.POST)
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.build());
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if (params.hasOption(IN_SECONDS_OPTION.getOpt())) {
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int seconds = Integer.parseInt(params.getOptionValue(IN_SECONDS_OPTION.getOpt()));
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taskBuilder.setScheduleTime(Timestamp
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.newBuilder()
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.setSeconds(Instant.now(Clock.systemUTC()).plusSeconds(seconds).getEpochSecond()));
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}
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Task task = client.createTask(
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QueueName.of(projectId, location, queueName).toString(), taskBuilder.build());
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System.out.println("Task created: " + task.getName());
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}
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// [END cloud_tasks_appengine_create_task]
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}
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private static void printUsage(Options options) {
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HelpFormatter formatter = new HelpFormatter();
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formatter.printHelp(
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"client",
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"A simple Cloud Tasks command line client that triggers a call to an AppEngine "
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+ "endpoint.",
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options, "", true);
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throw new RuntimeException();
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}
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}

‎appengine-java8/tasks/src/main/java/com/example/task/TaskServlet.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.task;
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import java.io.IOException;
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import java.util.logging.Logger;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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// [START cloud_tasks_appengine_quickstart]
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@WebServlet(
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name = "Tasks",
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description = "Create Cloud Task",
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urlPatterns = "/tasks/create"
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)
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public class TaskServlet extends HttpServlet {
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private static Logger log = Logger.getLogger(TaskServlet.class.getName());
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@Override
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public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
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log.info("Received task request: " + req.getServletPath());
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if (req.getParameter("payload") != null) {
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String payload = req.getParameter("payload");
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log.info("Request payload: " + payload);
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String output = String.format("Received task with payload %s", payload);
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resp.getOutputStream().write(output.getBytes());
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log.info("Sending response: " + output);
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resp.setStatus(HttpServletResponse.SC_OK);
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} else {
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log.warning("Null payload received in request to " + req.getServletPath());
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}
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}
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}
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// [END cloud_tasks_appengine_quickstart]

‎appengine-java8/tasks/src/main/webapp/WEB-INF/appengine-web.xml

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<?xml version="1.0" encoding="utf-8"?>
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<!-- [START_EXCLUDE] -->
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<!--
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Copyright 2016 Google Inc.
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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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<!-- [END_EXCLUDE] -->
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<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
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<runtime>java8</runtime>
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<threadsafe>true</threadsafe>
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</appengine-web-app>

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