/**
* 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.hadoop.hdfs.tools.offlineEditsViewer;
import java.io.File;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hdfs.tools.offlineEditsViewer.OfflineEditsViewer;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.server.namenode.EditLogFileInputStream;
import org.apache.hadoop.hdfs.server.namenode.EditLogInputStream;
/**
* OfflineEditsLoader walks an EditsVisitor over an EditLogInputStream
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
interface OfflineEditsLoader {
abstract public void loadEdits() throws IOException;
static class OfflineEditsLoaderFactory {
static OfflineEditsLoader createLoader(OfflineEditsVisitor visitor,
String inputFileName, boolean xmlInput,
OfflineEditsViewer.Flags flags) throws IOException {
if (xmlInput) {
return new OfflineEditsXmlLoader(visitor, new File(inputFileName), flags);
} else {
File file = null;
EditLogInputStream elis = null;
OfflineEditsLoader loader = null;
try {
file = new File(inputFileName);
elis = new EditLogFileInputStream(file, HdfsConstants.INVALID_TXID,
HdfsConstants.INVALID_TXID, false);
loader = new OfflineEditsBinaryLoader(visitor, elis, flags);
} finally {
if ((loader == null) && (elis != null)) {
elis.close();
}
}
return loader;
}
}
}
}