/**
* 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.ViewInstanceEntity;
import org.apache.ambari.server.view.ViewRegistry;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
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.util.HashMap;
import java.util.Map;
/**
* Service responsible for instances resource requests.
*/
public class ViewInstanceService extends BaseService {
/**
* Parent view name.
*/
private final String viewName;
/**
* The view version.
*/
private final String version;
// ----- Constructors ------------------------------------------------------
/**
* Construct a view instance service.
*
* @param viewName the view id
* @param version the version
*/
public ViewInstanceService(String viewName, String version) {
this.viewName = viewName;
this.version = version;
}
// ----- ViewInstanceService -----------------------------------------------
/**
* Handles URL: /views/{viewID}/instances/{instanceID}
* Get a specific instance.
*
* @param headers http headers
* @param ui uri info
* @param instanceName instance id
*
* @return instance resource representation
*/
@GET
@Path("{instanceName}")
@Produces("text/plain")
public Response getService(@Context HttpHeaders headers, @Context UriInfo ui,
@PathParam("instanceName") String instanceName) {
return handleRequest(headers, null, ui, Request.Type.GET,
createResource(viewName, version, instanceName));
}
/**
* Handles URL: /views/{viewID}/instances
* Get all instances for a view.
*
* @param headers http headers
* @param ui uri info
*
* @return instance collection resource representation
*/
@GET
@Produces("text/plain")
public Response getServices(@Context HttpHeaders headers, @Context UriInfo ui) {
return handleRequest(headers, null, ui, Request.Type.GET,
createResource(viewName, version, null));
}
/**
* Handles: POST /views/{viewID}/instances/{instanceId}
* Create a specific instance.
*
* @param body http body
* @param headers http headers
* @param ui uri info
* @param instanceName instance id
*
* @return information regarding the created instance
*/
@POST
@Path("{instanceName}")
@Produces("text/plain")
public Response createService(String body, @Context HttpHeaders headers, @Context UriInfo ui,
@PathParam("instanceName") String instanceName) {
return handleRequest(headers, body, ui, Request.Type.POST,
createResource(viewName, version, instanceName));
}
/**
* Handles: POST /views/{viewID}/instances
* Create multiple instances.
*
* @param body http body
* @param headers http headers
* @param ui uri info
*
* @return information regarding the created instances
*/
@POST
@Produces("text/plain")
public Response createServices(String body, @Context HttpHeaders headers, @Context UriInfo ui) {
return handleRequest(headers, body, ui, Request.Type.POST,
createResource(viewName, version, null));
}
/**
* Handles: PUT /views/{viewID}/instances/{instanceId}
* Update a specific instance.
*
* @param body http body
* @param headers http headers
* @param ui uri info
* @param instanceName instance id
*
* @return information regarding the updated instance
*/
@PUT
@Path("{instanceName}")
@Produces("text/plain")
public Response updateService(String body, @Context HttpHeaders headers, @Context UriInfo ui,
@PathParam("instanceName") String instanceName) {
return handleRequest(headers, body, ui, Request.Type.PUT, createResource(viewName, version, instanceName));
}
/**
* Handles: PUT /views/{viewID}/instances
* Update multiple instances.
*
* @param body http body
* @param headers http headers
* @param ui uri info
*
* @return information regarding the updated instance
*/
@PUT
@Produces("text/plain")
public Response updateServices(String body, @Context HttpHeaders headers, @Context UriInfo ui) {
return handleRequest(headers, body, ui, Request.Type.PUT, createResource(viewName, version, null));
}
/**
* Handles: DELETE /views/{viewID}/instances/{instanceId}
* Delete a specific instance.
*
* @param headers http headers
* @param ui uri info
* @param instanceName instance id
*
* @return information regarding the deleted instance
*/
@DELETE
@Path("{instanceName}")
@Produces("text/plain")
public Response deleteService(@Context HttpHeaders headers, @Context UriInfo ui,
@PathParam("instanceName") String instanceName) {
return handleRequest(headers, null, ui, Request.Type.DELETE, createResource(viewName, version, instanceName));
}
/**
* Get the sub-resource
*
* @param instanceName the instance id
*
* @return the service
*/
@Path("{instanceName}/{resources}")
public Object getResourceHandler(@PathParam("instanceName") String instanceName,
@PathParam("resources") String resources) {
ViewInstanceEntity instanceDefinition =
ViewRegistry.getInstance().getInstanceDefinition(viewName, version, instanceName);
if (instanceDefinition == null) {
throw new IllegalArgumentException("A view instance " +
viewName + "/" + instanceName + " can not be found.");
}
Object service = instanceDefinition.getService(resources);
if (service == null) {
throw new IllegalArgumentException("A resource type " + resources + " for view instance " +
viewName + "/" + instanceName + " can not be found.");
}
return service;
}
// ----- helper methods ----------------------------------------------------
/**
* Create an view instance resource.
*
* @param viewName view name
* @param instanceName instance name
*
* @return a view instance resource
*/
private ResourceInstance createResource(String viewName, String viewVersion, String instanceName) {
Map<Resource.Type,String> mapIds = new HashMap<Resource.Type, String>();
mapIds.put(Resource.Type.View, viewName);
mapIds.put(Resource.Type.ViewVersion, viewVersion);
mapIds.put(Resource.Type.ViewInstance, instanceName);
return createResource(Resource.Type.ViewInstance, mapIds);
}
}