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docs: adding pubsub emulator example (#1602)
* adding pubsub emulator example * docs: adding pubsub emulator example * 🦉 Updates from OwlBot post-processor See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md --------- Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
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samples/snippets/src/main/java/pubsub/UsePubSubEmulatorExample.java
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| /* | ||
| * Copyright 2017 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 pubsub; | ||
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| import com.google.api.gax.core.CredentialsProvider; | ||
| import com.google.api.gax.core.NoCredentialsProvider; | ||
| import com.google.api.gax.grpc.GrpcTransportChannel; | ||
| import com.google.api.gax.rpc.FixedTransportChannelProvider; | ||
| import com.google.api.gax.rpc.TransportChannelProvider; | ||
| import com.google.cloud.pubsub.v1.Publisher; | ||
| import com.google.cloud.pubsub.v1.TopicAdminClient; | ||
| import com.google.cloud.pubsub.v1.TopicAdminSettings; | ||
| import com.google.pubsub.v1.TopicName; | ||
| import io.grpc.ManagedChannel; | ||
| import io.grpc.ManagedChannelBuilder; | ||
| import java.io.IOException; | ||
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| /** | ||
| * Snippet that demonstrates creating Pub/Sub clients using the Google Cloud Pub/Sub emulator. | ||
| * | ||
| * <p>Note: clients cannot start/stop the emulator. | ||
| */ | ||
| public class UsePubSubEmulatorExample { | ||
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| public static void main(String... args) throws IOException { | ||
| // [START pubsub_use_emulator] | ||
| String hostport = System.getenv("PUBSUB_EMULATOR_HOST"); | ||
| ManagedChannel channel = ManagedChannelBuilder.forTarget(hostport).usePlaintext().build(); | ||
| try { | ||
| TransportChannelProvider channelProvider = | ||
| FixedTransportChannelProvider.create(GrpcTransportChannel.create(channel)); | ||
| CredentialsProvider credentialsProvider = NoCredentialsProvider.create(); | ||
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| // Set the channel and credentials provider when creating a `TopicAdminClient`. | ||
| // Similarly for SubscriptionAdminClient | ||
| TopicAdminClient topicClient = | ||
| TopicAdminClient.create( | ||
| TopicAdminSettings.newBuilder() | ||
| .setTransportChannelProvider(channelProvider) | ||
| .setCredentialsProvider(credentialsProvider) | ||
| .build()); | ||
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| TopicName topicName = TopicName.of("my-project-id", "my-topic-id"); | ||
| // Set the channel and credentials provider when creating a `Publisher`. | ||
| // Similarly for Subscriber | ||
| Publisher publisher = | ||
| Publisher.newBuilder(topicName) | ||
| .setChannelProvider(channelProvider) | ||
| .setCredentialsProvider(credentialsProvider) | ||
| .build(); | ||
| } finally { | ||
| channel.shutdown(); | ||
| } | ||
| // [END pubsub_use_emulator] | ||
| } | ||
| } |