Add Reactive client

Author: fitzoh

spring-cloud-aws-cloud-map-service-discovery/pom.xml

@@ -34,6 +34,11 @@
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-core</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>io.projectreactor</groupId>
+			<artifactId>reactor-core</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework.cloud</groupId>
 			<artifactId>spring-cloud-commons</artifactId>

spring-cloud-aws-cloud-map-service-discovery/src/main/java/org/springframework/cloud/aws/cloudmap/AwsCloudMapReactiveDiscoveryClient.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2013-2019 the original author or authors.
+ *
+ * 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
+ *
+ *      https://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.springframework.cloud.aws.cloudmap;
+
+import com.amazonaws.services.servicediscovery.AWSServiceDiscovery;
+import com.amazonaws.services.servicediscovery.model.GetInstanceRequest;
+import com.amazonaws.services.servicediscovery.model.GetInstanceResult;
+import com.amazonaws.services.servicediscovery.model.ListInstancesRequest;
+import com.amazonaws.services.servicediscovery.model.ListServicesRequest;
+import com.amazonaws.services.servicediscovery.model.ListServicesResult;
+import com.amazonaws.services.servicediscovery.model.ServiceSummary;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+
+import org.springframework.cloud.client.ServiceInstance;
+import org.springframework.cloud.client.discovery.ReactiveDiscoveryClient;
+
+public class AwsCloudMapReactiveDiscoveryClient implements ReactiveDiscoveryClient {
+
+	private final AWSServiceDiscovery aws;
+
+	public AwsCloudMapReactiveDiscoveryClient(AWSServiceDiscovery aws) {
+		this.aws = aws;
+	}
+
+	@Override
+	public String description() {
+		return "AWS Cloud Map Reactive Discovery Client";
+	}
+
+	@Override
+	public Flux<ServiceInstance> getInstances(String serviceId) {
+		ListInstancesRequest request = new ListInstancesRequest()
+				.withServiceId(serviceId);
+
+		return Mono.fromSupplier(() -> aws.listInstances(request))
+				.flatMapMany(resp -> Flux.fromIterable(resp.getInstances())
+						.flatMap(summary -> getInstance(serviceId, summary.getId())));
+	}
+
+	private Mono<AwsCloudMapServiceInstance> getInstance(String serviceId,
+			String instanceId) {
+		GetInstanceRequest request = new GetInstanceRequest().withServiceId(serviceId)
+				.withInstanceId(instanceId);
+
+		return Mono.fromSupplier(() -> aws.getInstance(request))
+				.map(GetInstanceResult::getInstance)
+				.map(instance -> new AwsCloudMapServiceInstance(serviceId, instance));
+	}
+
+	@Override
+	public Flux<String> getServices() {
+		ListServicesRequest request = new ListServicesRequest();
+
+		return Mono.fromSupplier(() -> aws.listServices(request))
+				.flatMapIterable(ListServicesResult::getServices)
+				.map(ServiceSummary::getId);
+	}
+
+}