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| 1 | +/* |
| 2 | + * Copyright 2017 original author or authors. |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + * |
| 16 | + */ |
| 17 | + |
| 18 | +package org.springframework.cloud.gcp.pubsub.core; |
| 19 | + |
| 20 | +import java.io.IOException; |
| 21 | +import java.util.concurrent.ConcurrentHashMap; |
| 22 | + |
| 23 | +import com.google.api.gax.grpc.ExecutorProvider; |
| 24 | +import com.google.api.gax.grpc.InstantiatingExecutorProvider; |
| 25 | +import com.google.auth.oauth2.GoogleCredentials; |
| 26 | +import com.google.cloud.pubsub.spi.v1.Publisher; |
| 27 | +import com.google.protobuf.ByteString; |
| 28 | +import com.google.pubsub.v1.PubsubMessage; |
| 29 | +import com.google.pubsub.v1.TopicName; |
| 30 | + |
| 31 | +import org.springframework.beans.factory.InitializingBean; |
| 32 | +import org.springframework.cloud.gcp.pubsub.integration.converters.SimpleMessageConverter; |
| 33 | +import org.springframework.messaging.Message; |
| 34 | +import org.springframework.messaging.converter.MessageConverter; |
| 35 | + |
| 36 | +/** |
| 37 | + * @author Vinicius Carvalho |
| 38 | + */ |
| 39 | +public class PubSubTemplate implements PubSubOperations, InitializingBean { |
| 40 | + |
| 41 | + private final String projectId; |
| 42 | + |
| 43 | + private final GoogleCredentials credentials; |
| 44 | + |
| 45 | + private ConcurrentHashMap<String, Publisher> publishers = new ConcurrentHashMap<>(); |
| 46 | + |
| 47 | + private ExecutorProvider executorProvider; |
| 48 | + |
| 49 | + private MessageConverter converter; |
| 50 | + |
| 51 | + private int concurrentProducers = 1; |
| 52 | + |
| 53 | + public PubSubTemplate(GoogleCredentials credentials, String projectId) { |
| 54 | + this.projectId = projectId; |
| 55 | + this.credentials = credentials; |
| 56 | + this.executorProvider = InstantiatingExecutorProvider.newBuilder() |
| 57 | + .setExecutorThreadCount(concurrentProducers).build(); |
| 58 | + this.converter = new SimpleMessageConverter(); |
| 59 | + } |
| 60 | + |
| 61 | + @Override |
| 62 | + public String send(final String topic, Message message) throws RuntimeException { |
| 63 | + |
| 64 | + Publisher publisher = publishers.computeIfAbsent(topic, s -> { |
| 65 | + try { |
| 66 | + return Publisher.defaultBuilder(TopicName.create(projectId, topic)) |
| 67 | + .setExecutorProvider(executorProvider).build(); |
| 68 | + } |
| 69 | + catch (IOException e) { |
| 70 | + e.printStackTrace(); |
| 71 | + } |
| 72 | + return null; |
| 73 | + }); |
| 74 | + |
| 75 | + try { |
| 76 | + return publisher.publish(PubsubMessage.newBuilder() |
| 77 | + .setData(ByteString |
| 78 | + .copyFrom(message.getPayload().toString().getBytes())) |
| 79 | + .build()).get(); |
| 80 | + } |
| 81 | + catch (Exception e) { |
| 82 | + throw new RuntimeException(e); |
| 83 | + } |
| 84 | + } |
| 85 | + |
| 86 | + @Override |
| 87 | + public void afterPropertiesSet() throws Exception { |
| 88 | + |
| 89 | + } |
| 90 | +} |
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