com.inmobi.conduit.distcp.tools.GlobbedCopyListing.java Source code

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Here is the source code for com.inmobi.conduit.distcp.tools.GlobbedCopyListing.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 com.inmobi.conduit.distcp.tools;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.security.Credentials;

/**
 * GlobbedCopyListing implements the CopyListing interface, to create the copy
 * listing-file by "globbing" all specified source paths (wild-cards and all.)
 */
public class GlobbedCopyListing extends CopyListing {
    private static final Log LOG = LogFactory.getLog(GlobbedCopyListing.class);

    private final CopyListing simpleListing;

    /**
     * Constructor, to initialize the configuration.
     * @param configuration: The input Configuration object.
     * @param credentials - Credentials object on which the FS delegation tokens are cached. If null
     * delegation token caching is skipped
     */
    public GlobbedCopyListing(Configuration configuration, Credentials credentials) {
        super(configuration, credentials);
        simpleListing = new SimpleCopyListing(getConf(), credentials);
    }

    /** {@inheritDoc} */
    @Override
    protected void validatePaths(DistCpOptions options) throws IOException, InvalidInputException {
    }

    /**
     * Implementation of CopyListing::buildListing().
     * Creates the copy listing by "globbing" all source-paths.
     * @param pathToListingFile: The location at which the copy-listing file
     *                           is to be created.
     * @param options: Input Options for DistCp (indicating source/target paths.)
     * @throws IOException
     */
    @Override
    public void doBuildListing(Path pathToListingFile, DistCpOptions options) throws IOException {

        List<Path> globbedPaths = new ArrayList<Path>();
        if (options.getSourcePaths().isEmpty()) {
            throw new InvalidInputException("Nothing to process. Source paths::EMPTY");
        }

        for (Path p : options.getSourcePaths()) {
            FileSystem fs = p.getFileSystem(getConf());
            FileStatus[] inputs = fs.globStatus(p);

            if (inputs != null && inputs.length > 0) {
                for (FileStatus onePath : inputs) {
                    globbedPaths.add(onePath.getPath());
                }
            } else {
                throw new InvalidInputException(p + " doesn't exist");
            }
        }

        DistCpOptions optionsGlobbed = new DistCpOptions(globbedPaths, options.getTargetPath());
        optionsGlobbed.setSyncFolder(options.shouldSyncFolder());
        optionsGlobbed.setOverwrite(options.shouldOverwrite());
        optionsGlobbed.setDeleteMissing(options.shouldDeleteMissing());
        optionsGlobbed.setPreserveSrcPath(options.shouldPreserveSrcPath());
        optionsGlobbed.setSkipPathValidation(options.isSkipPathValidation());
        optionsGlobbed.setUseSimpleFileListing(options.isUseSimpleFileListing());

        simpleListing.buildListing(pathToListingFile, optionsGlobbed);
    }

    /** {@inheritDoc} */
    @Override
    protected long getBytesToCopy() {
        return simpleListing.getBytesToCopy();
    }

    /** {@inheritDoc} */
    @Override
    protected long getNumberOfPaths() {
        return simpleListing.getNumberOfPaths();
    }

}