/*
* 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 gobblin.data.management.copy;
import java.io.IOException;
import java.util.Collection;
import java.util.Iterator;
import lombok.extern.slf4j.Slf4j;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import com.google.common.collect.ImmutableList;
import gobblin.util.PathUtils;
/**
* A {@link CopyableFileFilter} that drops a {@link CopyableFile} if another file with "filename.ready" is not found on
* the <code>sourceFs<code>
*/
@Slf4j
public class ReadyCopyableFileFilter implements CopyableFileFilter {
public static final String READY_EXTENSION = ".ready";
/**
* For every {@link CopyableFile} in <code>copyableFiles</code> checks if a {@link CopyableFile#getOrigin()#getPath()}
* + .ready files is present on <code>sourceFs</code> {@inheritDoc}
*
* @see gobblin.data.management.copy.CopyableFileFilter#filter(org.apache.hadoop.fs.FileSystem,
* org.apache.hadoop.fs.FileSystem, java.util.Collection)
*/
@Override
public Collection<CopyableFile> filter(FileSystem sourceFs, FileSystem targetFs,
Collection<CopyableFile> copyableFiles) {
Iterator<CopyableFile> cfIterator = copyableFiles.iterator();
ImmutableList.Builder<CopyableFile> filtered = ImmutableList.builder();
while (cfIterator.hasNext()) {
CopyableFile cf = cfIterator.next();
Path readyFilePath = PathUtils.addExtension(cf.getOrigin().getPath(), READY_EXTENSION);
try {
if (sourceFs.exists(readyFilePath)) {
filtered.add(cf);
} else {
log.info(String.format("Removing %s as the .ready file is not found", cf.getOrigin().getPath()));
}
} catch (IOException e) {
log.warn(String.format("Removing %s as the .ready file can not be read. Exception %s",
cf.getOrigin().getPath(), e.getMessage()));
}
}
return filtered.build();
}
}