/**
* Copyright (C) 2013 Salzburg Research.
*
* Licensed 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 at.newmedialab.ldpath.backend.linkeddata;
import at.newmedialab.ldclient.model.CacheEntry;
import org.openrdf.repository.Repository;
import org.openrdf.repository.RepositoryException;
import org.openrdf.repository.sail.SailRepository;
import org.openrdf.sail.memory.MemoryStore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.HashMap;
import java.util.Map;
/**
* A Linked Data backend implementation with no persistent storage. All retrieved data is kept in memory and discarded
* when the virtual machine exits.
* <p/>
* Author: Sebastian Schaffert
*/
public class LDMemoryBackend extends AbstractLDBackend {
private static final Logger log = LoggerFactory.getLogger(LDMemoryBackend.class);
private Map<String,CacheEntry> cacheEntries;
public LDMemoryBackend() {
super();
cacheEntries = new HashMap<String,CacheEntry>();
try {
Repository repository = new SailRepository(new MemoryStore());
repository.initialize();
setRepository(repository);
} catch (RepositoryException e) {
log.error("error initialising connection to Sesame in-memory repository",e);
}
}
/**
* Return a map that can be used to store caching metadata about resources. The LDCacheProvider should take care
* of persisting the metadata if desired.
*
* @return a map for storing caching metadata
*/
@Override
public Map<String,CacheEntry> getMetadataRepository() {
return cacheEntries;
}
}