examples/kotlin/src/main/java/org/apache/beam/examples/kotlin/common/ExamplePubsubTopicAndSubscriptionOptions.kt

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 *     http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.beam.examples.kotlin.common

import org.apache.beam.sdk.extensions.gcp.options.GcpOptions
import org.apache.beam.sdk.options.Default
import org.apache.beam.sdk.options.DefaultValueFactory
import org.apache.beam.sdk.options.Description
import org.apache.beam.sdk.options.PipelineOptions

/** Options that can be used to configure Pub/Sub topic/subscription in Beam examples.  */
interface ExamplePubsubTopicAndSubscriptionOptions : ExamplePubsubTopicOptions {
    @get:Description("Pub/Sub subscription")
    @get:Default.InstanceFactory(PubsubSubscriptionFactory::class)
    var pubsubSubscription: String

    /** Returns a default Pub/Sub subscription based on the project and the job names.  */
    class PubsubSubscriptionFactory : DefaultValueFactory<String> {
        override fun create(options: PipelineOptions) = """
                projects/
                ${(options as GcpOptions).project}
                /subscriptions/
                ${options.jobName}
            """.trimIndent()
    }
}