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https://issues.apache.org/jira/browse/FLINK-9311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16593118#comment-16593118
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ASF GitHub Bot commented on FLINK-9311:
---------------------------------------
yanghua commented on a change in pull request #6594: [FLINK-9311] [pubsub]
Added PubSub source connector with support for checkpointing (ATLEAST_ONCE)
URL: https://github.com/apache/flink/pull/6594#discussion_r212852318
##########
File path:
flink-connectors/flink-connector-pubsub/src/main/java/org/apache/flink/streaming/connectors/pubsub/PubSubSink.java
##########
@@ -0,0 +1,250 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.flink.streaming.connectors.pubsub;
+
+import org.apache.flink.api.common.serialization.SerializationSchema;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
+import org.apache.flink.streaming.api.functions.sink.SinkFunction;
+import
org.apache.flink.streaming.connectors.pubsub.common.SerializableCredentialsProvider;
+
+import com.google.api.gax.core.CredentialsProvider;
+import com.google.api.gax.grpc.GrpcTransportChannel;
+import com.google.api.gax.rpc.FixedTransportChannelProvider;
+import com.google.api.gax.rpc.TransportChannel;
+import com.google.auth.Credentials;
+import com.google.cloud.pubsub.v1.Publisher;
+import com.google.protobuf.ByteString;
+import com.google.pubsub.v1.ProjectTopicName;
+import com.google.pubsub.v1.PubsubMessage;
+import io.grpc.ManagedChannel;
+import io.grpc.ManagedChannelBuilder;
+
+import java.io.IOException;
+
+/**
+ * A sink function that outputs to PubSub.
+ *
+ * @param <IN> type of PubSubSink messages to write
+ */
+public class PubSubSink<IN> extends RichSinkFunction<IN> {
+
+ private SerializableCredentialsProvider serializableCredentialsProvider;
+ private SerializationSchema<IN> serializationSchema;
+ private String projectName;
+ private String topicName;
+ private String hostAndPort = null;
+
+ private transient Publisher publisher;
+
+ private PubSubSink() {
Review comment:
Sorry, I missed your `PubSubSinkBuilder`, I just saw that you have done a
lot of NPE checks on the `initialize` method in this class. If they are
mandatory fields, you can pass them directly in the constructor of
`PubSubSinkBuilder`. Maybe this can save these checks?
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> PubSub connector
> ----------------
>
> Key: FLINK-9311
> URL: https://issues.apache.org/jira/browse/FLINK-9311
> Project: Flink
> Issue Type: New Feature
> Components: Streaming Connectors
> Reporter: Richard Deurwaarder
> Assignee: Niels Basjes
> Priority: Minor
> Labels: pull-request-available
>
> I would like start adding some google cloud connectors starting with a PubSub
> Source. I have a basic implementation ready but I want it to be able to:
> * easily scale up (should I have it extend RichParallelSourceFunction for
> this?)
> * Make it easier to provide the google cloud credentials. This would require
> being able to send some json string / ServiceAccount to the nodes when
> starting up this source.
> Could this be something that would be useful for others and added to the
> flink connectors repo?
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