com.cloudera.hoop.fs.FSSetReplication.java Source code

Introduction

Here is the source code for com.cloudera.hoop.fs.FSSetReplication.java

Source

/*
 * Copyright (c) 2011, Cloudera, Inc. All Rights Reserved.
 *
 * Cloudera, Inc. 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
 *
 * This software 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.cloudera.hoop.fs;

import com.cloudera.lib.service.Hadoop;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.json.simple.JSONObject;

import java.io.IOException;

/**
 * Executor that performs a set-replication Hadoop files system operation.
 */
public class FSSetReplication implements Hadoop.FileSystemExecutor<JSONObject> {
    private Path path;
    private short replication;

    /**
     * Creates a set-replication executor.
     *
     * @param path path to set the replication factor.
     * @param replication replication factor to set.
     */
    public FSSetReplication(String path, short replication) {
        this.path = new Path(path);
        this.replication = replication;
    }

    /**
     * Executes the filesystem operation.
     *
     * @param fs filesystem instance to use.
     * @return <code>true</code> if the replication value was set,
     * <code>false</code> otherwise.
     * @throws IOException thrown if an IO error occured.
     */
    @Override
    @SuppressWarnings("unchecked")
    public JSONObject execute(FileSystem fs) throws IOException {
        boolean ret = fs.setReplication(path, replication);
        JSONObject json = new JSONObject();
        json.put("setReplication", ret);
        return json;
    }

}