org.apache.hudi.common.fs.inline.InMemoryFileSystem Maven / Gradle / Ivy
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* 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,
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*/
package org.apache.hudi.common.fs.inline;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.util.Progressable;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
/**
* A FileSystem which stores all content in memory and returns a byte[] when {@link #getFileAsBytes()} is called
* This FileSystem is used only in write path. Does not support any read apis except {@link #getFileAsBytes()}.
*/
public class InMemoryFileSystem extends FileSystem {
// TODO: this needs to be per path to support num_cores > 1, and we should release the buffer once done
private ByteArrayOutputStream bos;
private Configuration conf = null;
public static final String SCHEME = "inmemfs";
private URI uri;
InMemoryFileSystem() {
}
@Override
public void initialize(URI name, Configuration conf) throws IOException {
super.initialize(name, conf);
this.conf = conf;
this.uri = name;
}
@Override
public URI getUri() {
return uri;
}
public String getScheme() {
return SCHEME;
}
@Override
public FSDataInputStream open(Path inlinePath, int bufferSize) {
return null;
}
@Override
public FSDataOutputStream create(Path path, FsPermission fsPermission, boolean b, int i, short i1, long l,
Progressable progressable) throws IOException {
bos = new ByteArrayOutputStream();
try {
this.uri = new URI(path.toString());
} catch (URISyntaxException e) {
throw new IllegalArgumentException("Path not parsable as URI " + path);
}
return new FSDataOutputStream(bos, new Statistics(getScheme()));
}
public byte[] getFileAsBytes() {
return bos.toByteArray();
}
@Override
public FSDataOutputStream append(Path path, int i, Progressable progressable) throws IOException {
return null;
}
@Override
public boolean rename(Path path, Path path1) throws IOException {
throw new UnsupportedOperationException("Can't rename files");
}
@Override
public boolean delete(Path path, boolean b) throws IOException {
throw new UnsupportedOperationException("Can't delete files");
}
@Override
public FileStatus[] listStatus(Path inlinePath) throws FileNotFoundException, IOException {
throw new UnsupportedOperationException("No support for listStatus");
}
@Override
public void setWorkingDirectory(Path path) {
throw new UnsupportedOperationException("Can't set working directory");
}
@Override
public Path getWorkingDirectory() {
return null;
}
@Override
public boolean mkdirs(Path path, FsPermission fsPermission) throws IOException {
throw new UnsupportedOperationException("Can't mkdir");
}
@Override
public boolean exists(Path f) throws IOException {
throw new UnsupportedOperationException("Can't check for exists");
}
@Override
public FileStatus getFileStatus(Path inlinePath) throws IOException {
throw new UnsupportedOperationException("No support for getFileStatus");
}
@Override
public void close() throws IOException {
super.close();
bos.close();
}
}