org.apache.jackrabbit.oak.segment.azure.AzureManifestFile Maven / Gradle / Ivy
/*
* 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.segment.azure;
import com.microsoft.azure.storage.StorageException;
import com.microsoft.azure.storage.blob.CloudBlockBlob;
import org.apache.jackrabbit.oak.segment.spi.persistence.ManifestFile;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Properties;
public class AzureManifestFile implements ManifestFile {
private static final Logger log = LoggerFactory.getLogger(AzureManifestFile.class);
private final CloudBlockBlob manifestBlob;
public AzureManifestFile(CloudBlockBlob manifestBlob) {
this.manifestBlob = manifestBlob;
}
@Override
public boolean exists() {
try {
return manifestBlob.exists();
} catch (StorageException e) {
log.error("Can't check if the manifest exists", e);
return false;
}
}
@Override
public Properties load() throws IOException {
Properties properties = new Properties();
if (exists()) {
long length = manifestBlob.getProperties().getLength();
byte[] data = new byte[(int) length];
try {
manifestBlob.downloadToByteArray(data, 0);
} catch (StorageException e) {
throw new IOException(e);
}
properties.load(new ByteArrayInputStream(data));
}
return properties;
}
@Override
public void save(Properties properties) throws IOException {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
properties.store(bos, null);
byte[] data = bos.toByteArray();
try {
manifestBlob.uploadFromByteArray(data, 0, data.length);
} catch (StorageException e) {
throw new IOException(e);
}
}
}