joshelser.HdfsServiceImpl.java Source code

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Here is the source code for joshelser.HdfsServiceImpl.java

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/*
 * 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 joshelser;

import java.io.FileNotFoundException;
import java.io.IOException;

import joshelser.thrift.HdfsService;

import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.thrift.TException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 */
public class HdfsServiceImpl implements HdfsService.Iface {
    private static final Logger log = LoggerFactory.getLogger(HdfsServiceImpl.class);
    private FileSystem fs;

    public HdfsServiceImpl(FileSystem fs) {
        this.fs = fs;
    }

    @Override
    public String ls(String directory) throws TException {
        StringBuilder sb = new StringBuilder(64);
        try {
            log.debug("Running as {}", UserGroupInformation.getCurrentUser());
            for (FileStatus stat : fs.listStatus(new Path(directory))) {
                sb.append(stat.getPath().getName());
                if (stat.isDirectory()) {
                    sb.append("/");
                }
                sb.append("\n");
            }
        } catch (FileNotFoundException e) {
            System.err.println("Got FileNotFoundException");
            e.printStackTrace(System.err);
            throw new TException(e);
        } catch (IllegalArgumentException e) {
            System.err.println("Got IllegalArgumentException");
            e.printStackTrace(System.err);
            throw new TException(e);
        } catch (IOException e) {
            System.err.println("Got IOException");
            e.printStackTrace(System.err);
            throw new TException(e);
        }

        return sb.toString();
    }

}