/**
* 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.hive.hcatalog.api.repl;
/**
* Interface for a client to provide a Staging Directory specification
*/
public interface StagingDirectoryProvider {
/**
* Return a temporary staging directory for a given key
* @param key key for the directory, usually a name of a partition
* Note that when overriding this method, no guarantees are made about the
* contents of the key, other than that is unique per partition.
* @return A parth specification to use as a temporary staging directory
*/
String getStagingDirectory(String key);
/**
* Trivial implementation of this interface - creates
*/
public class TrivialImpl implements StagingDirectoryProvider {
String prefix = null;
/**
* Trivial implementation of StagingDirectoryProvider which takes a temporary directory
* and creates directories inside that for each key. Note that this is intended as a
* trivial implementation, and if any further "advanced" behaviour is desired,
* it is better that the user roll their own.
*
* @param base temp directory inside which other tmp dirs are created
* @param separator path separator. Usually should be "/"
*/
public TrivialImpl(String base,String separator){
this.prefix = base + separator;
}
@Override
public String getStagingDirectory(String key) {
return prefix + key;
}
}
}