此页面由 Cloud Translation API 翻译。

JMS to Pub/Sub 模板

JMS to Pub/Sub 模板是一种流处理流水线，可从 Active MQ JMS 服务器（队列/主题）中读取消息，并将其写入 Pub/Sub。

流水线要求

Pub/Sub 输出主题名称必须存在。
JMS 主机 IP 必须存在，并且 Dataflow 工作器虚拟机具有正确的网络配置，方可访问 JMS 主机。
从中提取数据的 JMS 主题/队列必须具有名称。

模板参数

必需参数

inputName：从中读取数据的 JMS 主题或队列的名称。例如 queue。
inputType：要从中读取数据的 JMS 目标类型。可以是队列或主题。例如 queue。
outputTopic：要将数据发布到的 Pub/Sub 主题的名称。例如 projects/<PROJECT_ID>/topics/<TOPIC_NAME>。
username：用于在 JMS 服务器上进行身份验证的用户名。例如 sampleusername。
password：与提供的用户名关联的密码。例如 samplepassword。

可选参数

jmsServer：JMS (ActiveMQ) 服务器 IP。例如 tcp://10.0.0.1:61616。

运行模板

控制台

转到 Dataflow 基于模板创建作业页面。

转到“基于模板创建作业”

在作业名称字段中，输入唯一的作业名称。
可选：对于区域性端点，从下拉菜单中选择一个值。默认区域为 us-central1。
如需查看可以在其中运行 Dataflow 作业的区域列表，请参阅 Dataflow 位置。
从 Dataflow 模板下拉菜单中，选择 JMS to Pub/Sub template。
在提供的参数字段中，输入您的参数值。
点击运行作业。

gcloud

在 shell 或终端中，运行模板：

gcloud dataflow flex-template run JOB_NAME \
    --project=YOUR_PROJECT_ID \
    --region=REGION_NAME \
    --template-file-gcs-location=gs://dataflow-templates-REGION_NAME/VERSION/flex/JMS_to_Cloud_PubSub \
    --parameters \
jmsServer=JMS_SERVER,\
inputName=INPUT_NAME,\
inputType=INPUT_TYPE,\
outputTopic=OUTPUT_TOPIC,\
username=USERNAME,\
password=PASSWORD

您必须在此示例中替换以下值：

将 YOUR_PROJECT_ID 替换为项目 ID。
将替换为 Dataflow 地区名称。例如：us-central1。
将 JOB_NAME 替换为您选择的作业名称。作业名称必须与正则表达式 [a-z]([-a-z0-9]{0,38}[a-z0-9])? 匹配才有效。
将 JMS_SERVER 替换为 JMS 服务器地址。例如：tcp://10.0.0.0:61616
将 INPUT_NAME 替换为 JMS 服务器输入主题/队列的名称。例如：testtopic。
将 INPUT_TYPE 替换为 JMS 服务器目标类型（队列/主题）。例如：topic
将 OUTPUT_TOPIC 替换为 Pub/Sub 输出主题的名称。例如：projects/myproject/topics/testoutput。
将 USERNAME 替换为 JMS 服务器的用户名。例如：testuser。
将 PASSWORD 替换为与 JMS 服务器使用的用户名对应的密码。

API

如需使用 REST API 来运行模板，请发送 HTTP POST 请求。如需详细了解 API 及其授权范围，请参阅 projects.templates.launch。

POST https://dataflow.googleapis.com/v1b3/projects/PROJECT_ID/locations/LOCATION/flexTemplates:launch
{
   "launch_parameter": {
      "jobName": "JOB_NAME",
      "parameters": {
          "jmsServer": "JMS_SERVER",
          "inputName": "INPUT_NAME",
          "inputType": "INPUT_TYPE",
          "outputTopic": "OUTPUT_TOPIC",
          "username": "USERNAME",
          "password": "PASSWORD"
      },
      "containerSpecGcsPath": "gs://dataflow-templates-REGION_NAME/VERSION/flex/JMS_to_Cloud_PubSub",
   }
}

您必须在此示例中替换以下值：

将 YOUR_PROJECT_ID 替换为项目 ID。
将替换为 Dataflow 地区名称。例如：us-central1。
将 JOB_NAME 替换为您选择的作业名称。作业名称必须与正则表达式 [a-z]([-a-z0-9]{0,38}[a-z0-9])? 匹配才有效。
将 JMS_SERVER 替换为 JMS 服务器地址。例如：tcp://10.0.0.0:61616
将 INPUT_NAME 替换为 JMS 服务器输入主题/队列的名称。例如：testtopic。
将 INPUT_TYPE 替换为 JMS 服务器目标类型（队列/主题）。例如：topic
将 OUTPUT_TOPIC 替换为 Pub/Sub 输出主题的名称。例如：projects/myproject/topics/testoutput。
将 USERNAME 替换为 JMS 服务器的用户名。例如：testuser。
将 PASSWORD 替换为与 JMS 服务器使用的用户名对应的密码。

模板源代码

Java

/*
 * Copyright (C) 2023 Google LLC
 *
 * 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 com.google.cloud.teleport.v2.templates;

import com.google.cloud.teleport.metadata.Template;
import com.google.cloud.teleport.metadata.TemplateCategory;
import com.google.cloud.teleport.metadata.TemplateParameter;
import javax.jms.ConnectionFactory;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.PipelineResult;
import org.apache.beam.sdk.io.gcp.pubsub.PubsubIO;
import org.apache.beam.sdk.io.jms.JmsIO;
import org.apache.beam.sdk.io.jms.JmsRecord;
import org.apache.beam.sdk.options.PipelineOptions;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
import org.apache.beam.sdk.options.Validation;
import org.apache.beam.sdk.transforms.MapElements;
import org.apache.beam.sdk.transforms.SimpleFunction;
import org.apache.beam.sdk.values.PCollection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Dataflow template which reads data from Jms Queue/Topic and writes it to Cloud PubSub.
 *
 * <p>Check out <a
 * href="https://github.com/GoogleCloudPlatform/DataflowTemplates/blob/main/v2/jms-to-pubsub/README_Jms_to_PubSub.md">README</a>
 * for instructions on how to use or modify this template.
 */
@Template(
    name = "Jms_to_PubSub",
    category = TemplateCategory.STREAMING,
    displayName = "JMS to Pubsub",
    description =
        "The JMS to Pub/Sub template is a streaming pipeline that reads messages from ActiveMQ JMS Server (Queue/Topic) and writes them to Pub/Sub.",
    optionsClass = com.google.cloud.teleport.v2.templates.JmsToPubsub.JmsToPubsubOptions.class,
    flexContainerName = "jms-to-pubsub",
    contactInformation = "https://cloud.google.com/support",
    documentation =
        "https://cloud.google.com/dataflow/docs/guides/templates/provided/jms-to-pubsub",
    preview = true,
    requirements = {
      "The Pub/Sub output topic name must exist.",
      "The JMS host IP must exist and have the proper network configuration for Dataflow worker VMs to reach the JMS host.",
      "The JMS topic/queue that data is extracted from must have a name."
    },
    streaming = true,
    supportsAtLeastOnce = true)
public class JmsToPubsub {

  /**
   * Runs a pipeline which reads data from JMS queue/topic and writes it to Cloud PubSub.
   *
   * @param args arguments to the pipeline
   */
  private static final Logger LOG = LoggerFactory.getLogger(JmsToPubsub.class);

  public static void main(String[] args) {
    JmsToPubsubOptions options =
        PipelineOptionsFactory.fromArgs(args).withValidation().as(JmsToPubsubOptions.class);
    run(options);
  }

  public static void validate(JmsToPubsubOptions options) {
    if (options != null) {
      if ((options.getUsername() != null
              && (!options.getUsername().isEmpty() || !options.getUsername().isBlank()))
          && (options.getPassword() == null
              || options.getPassword().isBlank()
              || options.getPassword().isEmpty())) {
        throw new IllegalArgumentException(
            "While username is provided, password is required for authentication");
      }
    }
  }

  public static PipelineResult run(JmsToPubsubOptions options) {
    validate(options);
    Pipeline pipeline = Pipeline.create(options);
    String connectionURI = options.getJmsServer();
    ConnectionFactory myConnectionFactory;
    PCollection<JmsRecord> input;

    if (!options.getUsername().isEmpty() || !options.getUsername().isBlank()) {
      myConnectionFactory =
          new ActiveMQConnectionFactory(
              options.getUsername(), options.getPassword(), connectionURI);
    } else {
      myConnectionFactory = new ActiveMQConnectionFactory(connectionURI);
    }
    LOG.info("Given Input Type " + options.getInputType());
    if (options.getInputType().equalsIgnoreCase("queue")) {
      input =
          pipeline.apply(
              "Read From JMS Queue",
              JmsIO.read()
                  .withConnectionFactory(myConnectionFactory)
                  .withQueue(options.getInputName()));
    } else {
      input =
          pipeline.apply(
              "Read From JMS Topic",
              JmsIO.read()
                  .withConnectionFactory(myConnectionFactory)
                  .withTopic(options.getInputName()));
    }

    input
        .apply(
            MapElements.via(
                new SimpleFunction<JmsRecord, String>() {
                  public String apply(JmsRecord input) {
                    return input.getPayload();
                  }
                }))
        .apply("WriteToPubSubTopic", PubsubIO.writeStrings().to(options.getOutputTopic()));
    return pipeline.run();
  }

  /**
   * The {@link JmsToPubsubOptions} interface provides the custom execution options passed by the
   * executor at the command-line.
   */
  public interface JmsToPubsubOptions extends PipelineOptions {
    @TemplateParameter.Text(
        order = 1,
        groupName = "Source",
        optional = true,
        regexes = {"[,\\/:a-zA-Z0-9._-]+"},
        description = "JMS Host IP",
        helpText = "The JMS (ActiveMQ) Server IP.",
        example = "tcp://10.0.0.1:61616")
    @Validation.Required
    String getJmsServer();

    void setJmsServer(String jmsServer);

    @TemplateParameter.Text(
        order = 2,
        groupName = "Source",
        optional = false,
        regexes = {"[a-zA-Z0-9._-]+"},
        description = "JMS Queue/Topic Name to read the input from",
        helpText = "The name of the JMS topic or queue that data is read from.",
        example = "queue")
    @Validation.Required
    String getInputName();

    void setInputName(String inputName);

    @TemplateParameter.Text(
        order = 3,
        optional = false,
        regexes = {"[a-zA-Z0-9._-]+"},
        description = "JMS Destination Type to read the input from",
        helpText = "The JMS destination type to read data from. Can be a queue or a topic.",
        example = "queue")
    @Validation.Required
    String getInputType();

    void setInputType(String inputType);

    @TemplateParameter.PubsubTopic(
        order = 4,
        groupName = "Target",
        description = "Output Pub/Sub topic",
        helpText = "The name of the Pub/Sub topic to publish data to.",
        example = "projects/<PROJECT_ID>/topics/<TOPIC_NAME>")
    @Validation.Required
    String getOutputTopic();

    void setOutputTopic(String outputTopic);

    @TemplateParameter.Text(
        order = 5,
        description = "JMS Username",
        helpText = "The username to use for authentication on the JMS server.",
        example = "sampleusername")
    String getUsername();

    void setUsername(String username);

    @TemplateParameter.Password(
        order = 6,
        description = "JMS Password",
        helpText = "The password associated with the provided username.",
        example = "samplepassword")
    String getPassword();

    void setPassword(String password);
  }
}

后续步骤

了解 Dataflow 模板。
参阅 Google 提供的模板列表。