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  """
  Example Airflow DAG for Google Cloud Dataflow service
  """
  import os
  
  from airflow import models
  from airflow.providers.google.cloud.operators.dataflow import DataflowStartFlexTemplateOperator
  from airflow.utils.dates import days_ago
  
  GCP_PROJECT_ID = os.environ.get("GCP_PROJECT_ID", "example-project")
  
  DATAFLOW_FLEX_TEMPLATE_JOB_NAME = os.environ.get(
      'GCP_DATAFLOW_FLEX_TEMPLATE_JOB_NAME', "dataflow-flex-template"
  )
  
  # For simplicity we use the same topic name as the subscription name.
  PUBSUB_FLEX_TEMPLATE_TOPIC = os.environ.get(
      'GCP_DATAFLOW_PUBSUB_FLEX_TEMPLATE_TOPIC', "dataflow-flex-template"
  )
  PUBSUB_FLEX_TEMPLATE_SUBSCRIPTION = PUBSUB_FLEX_TEMPLATE_TOPIC
  GCS_FLEX_TEMPLATE_TEMPLATE_PATH = os.environ.get(
      'GCP_DATAFLOW_GCS_FLEX_TEMPLATE_TEMPLATE_PATH',
      "gs://test-airflow-dataflow-flex-template/samples/dataflow/templates/streaming-beam-sql.json",
  )
  BQ_FLEX_TEMPLATE_DATASET = os.environ.get('GCP_DATAFLOW_BQ_FLEX_TEMPLATE_DATASET', 'airflow_dataflow_samples')
  BQ_FLEX_TEMPLATE_LOCATION = os.environ.get('GCP_DATAFLOW_BQ_FLEX_TEMPLATE_LOCATION>', 'us-west1')
  
  with models.DAG(
      dag_id="example_gcp_dataflow_flex_template_java",
      start_date=days_ago(1),
      schedule_interval=None,  # Override to match your needs
  ) as dag_flex_template:
      # [START howto_operator_start_template_job]
      start_flex_template = DataflowStartFlexTemplateOperator(
          task_id="start_flex_template_streaming_beam_sql",
          body={
              "launchParameter": {
                  "containerSpecGcsPath": GCS_FLEX_TEMPLATE_TEMPLATE_PATH,
                  "jobName": DATAFLOW_FLEX_TEMPLATE_JOB_NAME,
                  "parameters": {
                      "inputSubscription": PUBSUB_FLEX_TEMPLATE_SUBSCRIPTION,
                      "outputTable": f"{GCP_PROJECT_ID}:{BQ_FLEX_TEMPLATE_DATASET}.streaming_beam_sql",
                  },
              }
          },
          do_xcom_push=True,
          location=BQ_FLEX_TEMPLATE_LOCATION,
      )
      # [END howto_operator_start_template_job]
  