001// Copyright 2006, 2008, 2009, 2011 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.tapestry5.internal.services; 016 017import org.apache.tapestry5.ioc.Resource; 018import org.apache.tapestry5.services.InvalidationEventHub; 019import org.apache.tapestry5.services.ResourceDigestGenerator; 020 021/** 022 * Caches information about resources on the classpath. In addition, acts as an invalidation hub for any resources for 023 * which information is obtained (when any of the resources are changed, invalidation listeners are notified so they can 024 * clear their caches). 025 * <p> 026 * Note that the name and role of this class changed (and diminished) quite a bit in Tapestry 5.3. It is now focused on 027 */ 028public interface ResourceDigestManager extends InvalidationEventHub 029{ 030 /** 031 * Returns true if the path requires that the client URL for the resource include a digest to validate that the 032 * client is authorized to access the resource. 033 * 034 * @param resource 035 * @return true if digest is required for the resource 036 * @see ResourceDigestGenerator#requiresDigest(String) 037 */ 038 boolean requiresDigest(Resource resource); 039 040 /** 041 * Returns the digest for the given path. 042 * 043 * @param resource 044 * @return the digest, or null if the resource does not exist 045 */ 046 String getDigest(Resource resource); 047}