| /* |
| * 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.olingo.server.api.etag; |
| |
| /** |
| * Register implementations for this interface in oder to support etags for the metadata document and service document. |
| */ |
| public interface ServiceMetadataETagSupport { |
| |
| /** |
| * Since the Olingo library cannot generate a metadata document etag in a generic way we call this method to retrieve |
| * an application specific etag for the metadata document. If this interface is registered applications can return an |
| * etag or null here to provide caching support for clients. If a client sends a GET request to the metadata document |
| * and this method delivers an etag we will match it to the request. If there has been no modification we will return |
| * a 304 NOT MODIFIED status code. If this interface is not registered or delivers null we just send back the usual |
| * metadata response. |
| * @return the application generated etag for the metadata document |
| */ |
| String getMetadataETag(); |
| |
| /** |
| * Since the Olingo library cannot generate a service document etag in a generic way we call this method to retrieve |
| * an application specific etag for the service document. If this interface is registered applications can return an |
| * etag or null here to provide caching support for clients. If a client sends a GET request to the service document |
| * and this method delivers an etag we will match it to the request. If there has been no modification we will return |
| * a 304 NOT MODIFIED status code. If this interface is not registered or delivers null we just send back the usual |
| * service document response. |
| * @return the application generated etag for the service document |
| */ |
| String getServiceDocumentETag(); |
| |
| } |