org.apache.hadoop.fs.s3a.s3guard.NullMetadataStore Maven / Gradle / Ivy
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This module contains code to support integration with Amazon Web Services.
It also declares the dependencies needed to work with AWS services.
/*
* 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.fs.s3a.s3guard;
import javax.annotation.Nullable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.s3a.S3AFileStatus;
import org.apache.hadoop.fs.s3a.S3ObjectAttributes;
import org.apache.hadoop.fs.s3a.impl.StoreContext;
import java.io.IOException;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* A no-op implementation of MetadataStore. Clients that use this
* implementation should behave the same as they would without any
* MetadataStore.
*/
public class NullMetadataStore implements MetadataStore {
@Override
public void initialize(FileSystem fs, ITtlTimeProvider ttlTimeProvider)
throws IOException {
}
@Override
public void initialize(Configuration conf, ITtlTimeProvider ttlTimeProvider)
throws IOException {
}
@Override
public void close() throws IOException {
}
@Override
public void delete(Path path,
final BulkOperationState operationState)
throws IOException {
}
@Override
public void forgetMetadata(Path path) throws IOException {
}
@Override
public void deleteSubtree(Path path,
final BulkOperationState operationState)
throws IOException {
}
@Override
public void deletePaths(final Collection paths,
@Nullable final BulkOperationState operationState) throws IOException {
}
@Override
public PathMetadata get(Path path) throws IOException {
return null;
}
@Override
public PathMetadata get(Path path, boolean wantEmptyDirectoryFlag)
throws IOException {
return null;
}
@Override
public DirListingMetadata listChildren(Path path) throws IOException {
return null;
}
@Override
public void move(Collection pathsToDelete,
Collection pathsToCreate,
final BulkOperationState operationState) throws IOException {
}
@Override
public void put(final PathMetadata meta) throws IOException {
}
@Override
public void put(PathMetadata meta,
final BulkOperationState operationState) throws IOException {
}
@Override
public void put(Collection meta,
final BulkOperationState operationState) throws IOException {
}
@Override
public void put(DirListingMetadata meta,
final List unchangedEntries,
final BulkOperationState operationState) throws IOException {
}
@Override
public void destroy() throws IOException {
}
@Override
public void prune(PruneMode pruneMode, long cutoff) {
}
@Override
public long prune(PruneMode pruneMode, long cutoff, String keyPrefix) {
return 0;
}
@Override
public String toString() {
return "NullMetadataStore";
}
@Override
public Map getDiagnostics() throws IOException {
Map map = new HashMap<>();
map.put("name", "Null Metadata Store");
map.put("description", "This is not a real metadata store");
return map;
}
@Override
public void updateParameters(Map parameters)
throws IOException {
}
@Override
public RenameTracker initiateRenameOperation(final StoreContext storeContext,
final Path source,
final S3AFileStatus sourceStatus,
final Path dest)
throws IOException {
return new NullRenameTracker(storeContext, source, dest, this);
}
@Override
public void setTtlTimeProvider(ITtlTimeProvider ttlTimeProvider) {
}
@Override
public void addAncestors(final Path qualifiedPath,
@Nullable final BulkOperationState operationState) throws IOException {
}
private static final class NullRenameTracker extends RenameTracker {
private NullRenameTracker(
final StoreContext storeContext,
final Path source,
final Path dest,
MetadataStore metadataStore) {
super("NullRenameTracker", storeContext, metadataStore, source, dest,
null);
}
@Override
public void fileCopied(final Path childSource,
final S3ObjectAttributes sourceAttributes,
final S3ObjectAttributes destAttributes,
final Path destPath,
final long blockSize,
final boolean addAncestors) throws IOException {
}
}
}