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KNOX-2395 - Make Gateway Services Pluggable (#358)
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61 changes: 61 additions & 0 deletions
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gateway-server/src/main/java/org/apache/knox/gateway/services/GatewayServiceFactory.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| /* | ||
| * 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.services; | ||
|
|
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| import java.util.Map; | ||
| import java.util.ServiceLoader; | ||
|
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| import org.apache.knox.gateway.GatewayMessages; | ||
| import org.apache.knox.gateway.config.GatewayConfig; | ||
| import org.apache.knox.gateway.i18n.messages.MessagesFactory; | ||
|
|
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| public class GatewayServiceFactory implements ServiceFactory { | ||
| private static final GatewayMessages LOG = MessagesFactory.get(GatewayMessages.class); | ||
| private ServiceLoader<ServiceFactory> serviceFactories; | ||
|
|
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| @Override | ||
| public Service create(GatewayServices gatewayServices, ServiceType serviceType, GatewayConfig gatewayConfig, Map<String, String> options) throws ServiceLifecycleException { | ||
| return create(gatewayServices, serviceType, gatewayConfig, options, null); | ||
| } | ||
|
|
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| @Override | ||
| public Service create(GatewayServices gatewayServices, ServiceType serviceType, GatewayConfig gatewayConfig, Map<String, String> options, String implementation) | ||
| throws ServiceLifecycleException { | ||
| Service service = null; | ||
| for (ServiceFactory serviceFactory : getServiceFactories()) { | ||
| service = implementation == null ? serviceFactory.create(gatewayServices, serviceType, gatewayConfig, options) | ||
| : serviceFactory.create(gatewayServices, serviceType, gatewayConfig, options, implementation); | ||
| if (service != null) { | ||
| break; | ||
| } | ||
| } | ||
| if (service != null) { | ||
| service.init(gatewayConfig, options); | ||
| } else { | ||
| LOG.noServiceFound(serviceType.getServiceTypeName()); | ||
| } | ||
| return service; | ||
| } | ||
|
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| private ServiceLoader<ServiceFactory> getServiceFactories() { | ||
| if (serviceFactories == null) { | ||
| serviceFactories = ServiceLoader.load(ServiceFactory.class); | ||
| } | ||
| return serviceFactories; | ||
| } | ||
| } |
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