/*
* 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.jackrabbit.oak.plugins.blob.datastore;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import java.util.Set;
import com.google.common.collect.Sets;
import org.apache.commons.io.IOUtils;
import org.apache.jackrabbit.core.data.AsyncUploadCallback;
import org.apache.jackrabbit.core.data.AsyncUploadResult;
import org.apache.jackrabbit.core.data.Backend;
import org.apache.jackrabbit.core.data.CachingDataStore;
import org.apache.jackrabbit.core.data.DataIdentifier;
import org.apache.jackrabbit.core.data.DataStore;
import org.apache.jackrabbit.core.data.DataStoreException;
import org.apache.jackrabbit.core.data.MultiDataStoreAware;
/**
* {@link Backend} wrapper over Jackrabbit {@link DataStore} which enables using
* a {@link CachingDataStore} for local file caching.
*/
public class DataStoreWrapperBackend implements Backend {
/** The data store being wrapped. */
private DataStore dataStore;
/**
* Instantiates a new data store wrapper backend.
*
* @param dataStore
* the data store
*/
public DataStoreWrapperBackend(DataStore dataStore) {
this.dataStore = dataStore;
}
@Override
public void init(CachingDataStore store, String homeDir, String config) throws DataStoreException {
}
@Override
public InputStream read(DataIdentifier identifier) throws DataStoreException {
return dataStore.getRecordIfStored(identifier).getStream();
}
@Override
public long getLength(DataIdentifier identifier) throws DataStoreException {
return dataStore.getRecord(identifier).getLength();
}
@Override
public long getLastModified(DataIdentifier identifier) throws DataStoreException {
return dataStore.getRecord(identifier).getLastModified();
}
@Override
public void writeAsync(DataIdentifier dataIdentifier, File file,
AsyncUploadCallback asyncUploadCallback) throws DataStoreException {
asyncUploadCallback.onFailure(
new AsyncUploadResult(dataIdentifier, file));
}
@Override
public void write(DataIdentifier identifier, File file) throws DataStoreException {
InputStream stream = null;
try {
stream = new FileInputStream(file);
dataStore.addRecord(stream);
} catch (IOException io) {
throw new DataStoreException("Error retrieving stream from : " + file.getAbsolutePath());
} finally {
IOUtils.closeQuietly(stream);
}
}
@Override
public Iterator<DataIdentifier> getAllIdentifiers() throws DataStoreException {
return dataStore.getAllIdentifiers();
}
@Override
public boolean exists(DataIdentifier identifier, boolean touch) throws DataStoreException {
return exists(identifier);
}
@Override
public boolean exists(DataIdentifier identifier) throws DataStoreException {
return (dataStore.getRecordIfStored(identifier) != null);
}
@Override
public void close() throws DataStoreException {
dataStore.close();
}
@Override
public Set<DataIdentifier> deleteAllOlderThan(long timestamp) throws DataStoreException {
dataStore.deleteAllOlderThan(timestamp);
return Sets.newHashSet();
}
@Override
public void deleteRecord(DataIdentifier identifier) throws DataStoreException {
if (dataStore instanceof MultiDataStoreAware) {
((MultiDataStoreAware) dataStore).deleteRecord(identifier);
}
}
}