| /* |
| * 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.felix.utils.repository; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.locks.ReadWriteLock; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| |
| import org.apache.felix.utils.json.JSONParser; |
| import org.apache.felix.utils.resource.ResourceBuilder; |
| import org.osgi.framework.BundleException; |
| import org.osgi.resource.Capability; |
| import org.osgi.resource.Requirement; |
| import org.osgi.resource.Resource; |
| |
| /** |
| * Repository using a JSON representation of resource metadata. |
| * The json should be a map: the key is the resource uri and the |
| * value is a map of resource headers. |
| * The content of the URL can be gzipped. |
| */ |
| public class JsonRepository extends BaseRepository { |
| |
| private final UrlLoader loader; |
| private final ReadWriteLock lock = new ReentrantReadWriteLock(); |
| |
| public JsonRepository(String url, long expiration) { |
| loader = new UrlLoader(url, expiration) { |
| @Override |
| protected boolean doRead(InputStream is) throws IOException { |
| return JsonRepository.this.doRead(is); |
| } |
| }; |
| } |
| |
| @Override |
| public List<Resource> getResources() { |
| checkAndLoadCache(); |
| lock.readLock().lock(); |
| try { |
| return super.getResources(); |
| } finally { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| @Override |
| public Map<Requirement, Collection<Capability>> findProviders(Collection<? extends Requirement> requirements) { |
| checkAndLoadCache(); |
| lock.readLock().lock(); |
| try { |
| return super.findProviders(requirements); |
| } finally { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| protected void checkAndLoadCache() { |
| loader.checkAndLoadCache(); |
| } |
| |
| protected boolean doRead(InputStream is) throws IOException { |
| Map<String, Map<String, String>> metadatas = verify(new JSONParser(is).getParsed()); |
| lock.writeLock().lock(); |
| try { |
| resources.clear(); |
| capSets.clear(); |
| for (Map.Entry<String, Map<String, String>> metadata : metadatas.entrySet()) { |
| buildResource(metadata.getKey(), metadata.getValue()); |
| } |
| return true; |
| } finally { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| protected void buildResource(String uri, Map<String, String> headerMap) throws IOException { |
| try { |
| Resource resource = ResourceBuilder.build(uri, headerMap); |
| addResource(resource); |
| } catch (BundleException e) { |
| throw new IOException("Unable to read resource: " + uri, e); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| private Map<String, Map<String, String>> verify(Object value) { |
| Map<?, ?> obj = Map.class.cast(value); |
| for (Map.Entry<?, ?> entry : obj.entrySet()) { |
| String.class.cast(entry.getKey()); |
| Map<?, ?> child = Map.class.cast(entry.getValue()); |
| for (Map.Entry<?, ?> ce : child.entrySet()) { |
| String.class.cast(ce.getKey()); |
| String.class.cast(ce.getValue()); |
| } |
| } |
| return (Map<String, Map<String, String>>) obj; |
| } |
| |
| } |