Adds new env post processor to add default gateway rsocket port.

spring-cloud-gateway-rsocket/src/main/java/org/springframework/cloud/gateway/rsocket/autoconfigure/GatewayRSocketEnvironmentPostProcessor.java

@@ -0,0 +1,42 @@
+/*
+ * 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.gateway.rsocket.autoconfigure;
+
+import java.util.Collections;
+import java.util.Map;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.env.EnvironmentPostProcessor;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.MapPropertySource;
+
+public class GatewayRSocketEnvironmentPostProcessor implements EnvironmentPostProcessor {
+
+	@Override
+	public void postProcessEnvironment(ConfigurableEnvironment env,
+			SpringApplication application) {
+		Boolean enabled = env.getProperty("spring.cloud.gateway.rsocket.enabled",
+				Boolean.class, true);
+		if (enabled && !env.containsProperty("spring.rsocket.server.port")) {
+			Map<String, Object> map = Collections
+					.singletonMap("spring.rsocket.server.port", 7002);
+			env.getPropertySources()
+					.addLast(new MapPropertySource("Default Gateway RSocket Port", map));
+		}
+	}
+
+}

spring-cloud-gateway-rsocket/src/main/resources/META-INF/spring.factories

@@ -1,3 +1,7 @@
 # Auto Configure
 org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
 org.springframework.cloud.gateway.rsocket.autoconfigure.GatewayRSocketAutoConfiguration
+
+# Environment Post Processors
+org.springframework.boot.env.EnvironmentPostProcessor=\
+org.springframework.cloud.gateway.rsocket.autoconfigure.GatewayRSocketEnvironmentPostProcessor