[
https://issues.apache.org/jira/browse/KNOX-1914?focusedWorklogId=315093&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-315093
]
ASF GitHub Bot logged work on KNOX-1914:
----------------------------------------
Author: ASF GitHub Bot
Created on: 19/Sep/19 14:35
Start Date: 19/Sep/19 14:35
Worklog Time Spent: 10m
Work Description: risdenk commented on pull request #147: KNOX-1914 - New
admin API to be used by the UI to fetch available service discovery types
URL: https://github.com/apache/knox/pull/147#discussion_r326207706
##########
File path:
gateway-spi/src/main/java/org/apache/knox/gateway/topology/discovery/ServiceDiscoveryFactory.java
##########
@@ -0,0 +1,78 @@
+/*
+ * 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.knox.gateway.topology.discovery;
+
+import java.lang.reflect.Field;
+import java.util.HashSet;
+import java.util.ServiceLoader;
+import java.util.Set;
+
+import org.apache.commons.lang3.ArrayUtils;
+import org.apache.knox.gateway.services.Service;
+
+/**
+ * Creates instances of ServiceDiscovery implementations.
+ *
+ * This factory uses the ServiceLoader mechanism to load ServiceDiscovery
+ * implementations as extensions.
+ *
+ */
+public abstract class ServiceDiscoveryFactory {
+
+ private static final Service[] NO_GATEWAY_SERVICS = new Service[] {};
+
+ public static ServiceDiscovery get(String type) {
+ return get(type, NO_GATEWAY_SERVICS);
+ }
+
+ public static Set<ServiceDiscovery> getAllServiceDiscoveries() {
+ final Set<ServiceDiscovery> serviceDiscoveries = new HashSet<>();
+
ServiceLoader.load(ServiceDiscoveryType.class).forEach((serviceDiscoveryType)
-> {
+ serviceDiscoveries.add(serviceDiscoveryType.newInstance());
+ });
+ return serviceDiscoveries;
+ }
+
+ public static ServiceDiscovery get(String type, Service... gatewayServices) {
+ final ServiceDiscovery sd =
getAllServiceDiscoveries().stream().filter(serviceDiscovery ->
serviceDiscovery.getType().equalsIgnoreCase(type)).findFirst().orElse(null);
+ // Inject any gateway services that were specified, and which are
referenced in
+ // the impl
+ injectGatewayServices(sd, gatewayServices);
+ return sd;
+ }
+
+ private static void injectGatewayServices(final ServiceDiscovery
serviceDiscovery, Service... gatewayServices) {
+ if (ArrayUtils.isNotEmpty(gatewayServices)) {
+ try {
+ for (Field field : serviceDiscovery.getClass().getDeclaredFields()) {
+ if (field.getDeclaredAnnotation(GatewayService.class) != null) {
+ for (Service gatewayService : gatewayServices) {
+ if (gatewayService != null) {
+ if
(field.getType().isAssignableFrom(gatewayService.getClass())) {
+ field.setAccessible(true);
+ field.set(serviceDiscovery, gatewayService);
+ }
+ }
+ }
+ }
+ }
+ } catch (Exception e) {
+ e.printStackTrace(); // TODO: is this enough?
Review comment:
probably want to use a logger at minimum?
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Issue Time Tracking
-------------------
Worklog Id: (was: 315093)
Time Spent: 0.5h (was: 20m)
> Dynamic population of Admin UI service discovery type options
> -------------------------------------------------------------
>
> Key: KNOX-1914
> URL: https://issues.apache.org/jira/browse/KNOX-1914
> Project: Apache Knox
> Issue Type: Bug
> Components: AdminUI
> Affects Versions: 1.3.0
> Reporter: Phil Zampino
> Assignee: Sandor Molnar
> Priority: Major
> Fix For: 1.4.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> The Discovery Details section of the Admin UI for working with descriptors
> includes a drop-down list of supported discovery providers (e.g., Ambari,
> ClouderaManager). Currently, this list is statically defined in the Admin UI.
> It should be possible to expose an API from the Knox host for determining the
> list of supported discovery providers.
> This API could leverage the same Java service loader mechanism that is used
> by the discovery runtime to load discovery providers.
> This would be nice for two closely-related reasons:
> # Subsequent additional discovery providers implemented in the Knox project
> itself won't require further Admin UI changes.
> # User/Customer discovery provider extensions would get Admin UI support
> automatically.
>
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