Introduced ServiceInstance metadata map.

spring-cloud-commons/src/main/java/org/springframework/cloud/client/DefaultServiceInstance.java

@@ -17,8 +17,11 @@
 package org.springframework.cloud.client;
 
 import java.net.URI;
+import java.util.Collections;
+import java.util.Map;
 
 import lombok.Data;
+import lombok.RequiredArgsConstructor;
 
 /**
  * Default implementation of {@link ServiceInstance}.
@@ -26,6 +29,7 @@ import lombok.Data;
  * @author Spencer Gibb
  */
 @Data
+@RequiredArgsConstructor
 public class DefaultServiceInstance implements ServiceInstance {
 
 	private final String serviceId;
@@ -36,11 +40,22 @@ public class DefaultServiceInstance implements ServiceInstance {
 
 	private final boolean secure;
 
+	private final Map<String, String> metadata;
+
+	public DefaultServiceInstance(String serviceId, String host, int port, boolean secure) {
+		this(serviceId, host, port, secure, Collections.<String, String>emptyMap());
+	}
+
 	@Override
 	public URI getUri() {
 		return getUri(this);
 	}
 
+	@Override
+	public Map<String, String> getMetadata() {
+		return metadata;
+	}
+
 	/**
 	 * Create a uri from the given ServiceInstance's host:port
 	 * @param instance

spring-cloud-commons/src/main/java/org/springframework/cloud/client/ServiceInstance.java

@@ -17,6 +17,7 @@
 package org.springframework.cloud.client;
 
 import java.net.URI;
+import java.util.Map;
 
 /**
  * Represents an instance of a Service in a Discovery System
@@ -27,23 +28,30 @@ public interface ServiceInstance {
 	/**
 	 * @return the service id as register by the DiscoveryClient
 	 */
-	public String getServiceId();
+	String getServiceId();
 
 	/**
 	 * @return the hostname of the registered ServiceInstance
 	 */
-	public String getHost();
+	String getHost();
 
 	/**
 	 * @return the port of the registered ServiceInstance
 	 */
-	public int getPort();
+	int getPort();
 
 	/**
-	 * @return ifthe port of the registered ServiceInstance is https or not
+	 * @return if the port of the registered ServiceInstance is https or not
 	 */
-	public boolean isSecure();
+	boolean isSecure();
 
-	public URI getUri();
+	/**
+	 * @return the service uri address
+	 */
+	URI getUri();
 
+	/**
+	 * @return the key value pair metadata associated with the service instance
+	 */
+	Map<String, String> getMetadata();
 }