/**
* 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.ambari.server.api.services;
import org.apache.ambari.server.api.resources.ResourceInstance;
import org.apache.ambari.server.controller.spi.Resource;
import org.apache.ambari.server.orm.entities.ViewEntity;
import org.apache.ambari.server.orm.entities.ViewInstanceEntity;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
* Service responsible for view sub-resource requests.
*/
public class ViewExternalSubResourceService extends BaseService {
/**
* The resource type.
*/
private final Resource.Type type;
/**
* The view name.
*/
private final String viewName;
/**
* The view version.
*/
private final String version;
/**
* The instance name.
*/
private final String instanceName;
/**
* Mapping of resource names to services.
*/
private final Map<String, Object> resourceServiceMap = new HashMap<String, Object>();
// ----- Constructors ------------------------------------------------------
public ViewExternalSubResourceService(Resource.Type type, ViewInstanceEntity viewInstanceDefinition) {
ViewEntity viewEntity = viewInstanceDefinition.getViewEntity();
this.type = type;
this.viewName = viewEntity.getCommonName();
this.version = viewEntity.getVersion();
this.instanceName = viewInstanceDefinition.getName();
}
/**
* Handles URL: /resources
* Get all external resources for a view.
*
* @param headers http headers
* @param ui uri info
*
* @return instance collection resource representation
*/
@GET
@Produces("text/plain")
public Response getResources(@Context HttpHeaders headers, @Context UriInfo ui) {
return handleRequest(headers, null, ui, Request.Type.GET,
createResource(viewName, instanceName));
}
/**
* Handles: GET /resources/{resourceName} Get a specific external resource.
*
* @param resourceName resource name
*
* @return resource service instance representation
*
* @throws IllegalArgumentException if the given resource name is unknown
*/
@Path("{resourceName}")
public Object getResource(@PathParam("resourceName") String resourceName) throws IOException {
Object service = resourceServiceMap.get(resourceName);
if (service == null) {
throw new IllegalArgumentException("A resource type " + resourceName + " for view instance " +
viewName + "/" + instanceName + " can not be found.");
}
return service;
}
// ----- helper methods ----------------------------------------------------
/**
* Register a sub-resource service.
*
* @param resourceName the resource name
* @param service the service
*/
public void addResourceService(String resourceName, Object service) {
resourceServiceMap.put(resourceName, service);
}
/**
* Create an view instance resource.
*
* @param viewName view name
* @param instanceName instance name
*
* @return a view instance resource
*/
private ResourceInstance createResource(String viewName, String instanceName) {
Map<Resource.Type,String> mapIds = new HashMap<Resource.Type, String>();
mapIds.put(Resource.Type.View, viewName);
mapIds.put(Resource.Type.ViewVersion, version);
mapIds.put(Resource.Type.ViewInstance, instanceName);
return createResource(type, mapIds);
}
}