com.google.cloud.pubsublite.beam.PerServerPublisherCache Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of pubsublite-beam-io Show documentation

Beam IO for Google Cloud Pub/Sub Lite

There is a newer version: 0.23.0

/*
 * Copyright 2020 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.pubsublite.beam;

/**
 * A shared cache per-worker instance of Pub/Sub Lite publishers.
 *
 * Pub/Sub Lite publishers connect to all available partitions: it would be a pessimization for
 * all instances of the PubsubLiteSink to do this.
 */
final class PerServerPublisherCache {
  private PerServerPublisherCache() {}

  static final PublisherCache PUBLISHER_CACHE = new PublisherCache();

  static {
    Runtime.getRuntime().addShutdownHook(new Thread(PUBLISHER_CACHE::close));
  }
}